/*!
 * \file src/change.c
 *
 * \brief Functions used to change object properties.
 *
 * <hr>
 *
 * <h1><b>Copyright.</b></h1>\n
 *
 * PCB, interactive printed circuit board design
 *
 * Copyright (C) 1994,1995,1996, 2005 Thomas Nau
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Contact addresses for paper mail and Email:
 * Thomas Nau, Schlehenweg 15, 88471 Baustetten, Germany
 * Thomas.Nau@rz.uni-ulm.de
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <stdio.h>

#include "global.h"

#include "change.h"
#include "create.h"
#include "crosshair.h"
#include "data.h"
#include "draw.h"
#include "error.h"
#include "mymem.h"
#include "misc.h"
#include "mirror.h"
#include "polygon.h"
#include "rats.h"
#include "remove.h"
#include "rtree.h"
#include "search.h"
#include "select.h"
#include "set.h"
#include "thermal.h"
#include "undo.h"

#ifdef HAVE_LIBDMALLOC
#include <dmalloc.h>
#endif

/* ---------------------------------------------------------------------------
 * some local prototypes
 */
static void *ChangePinSize (ElementType *, PinType *);
static void *ChangePinClearSize (ElementType *, PinType *);
static void *ChangePinMaskSize (ElementType *, PinType *);
static void *ChangePadSize (ElementType *, PadType *);
static void *ChangePadClearSize (ElementType *, PadType *);
static void *ChangePadMaskSize (ElementType *, PadType *);
static void *ChangePin2ndSize (ElementType *, PinType *);
static void *ChangeElement2ndSize (ElementType *);
static void *ChangeViaSize (PinType *);
static void *ChangeVia2ndSize (PinType *);
static void *ChangeViaClearSize (PinType *);
static void *ChangeViaMaskSize (PinType *);
static void *ChangeLineSize (LayerType *, LineType *);
static void *ChangeLineClearSize (LayerType *, LineType *);
static void *ChangePolygonClearSize (LayerType *, PolygonType *);
static void *ChangeArcSize (LayerType *, ArcType *);
static void *ChangeArcClearSize (LayerType *, ArcType *);
static void *ChangeTextSize (LayerType *, TextType *);
static void *ChangeElementSize (ElementType *);
static void *ChangeElementNameSize (ElementType *);
static void *ChangePinName (ElementType *, PinType *);
static void *ChangePadName (ElementType *, PadType *);
static void *ChangeViaName (PinType *);
static void *ChangeLineName (LayerType *, LineType *);
static void *ChangeElementName (ElementType *);
static void *ChangeTextName (LayerType *, TextType *);
static void *ChangeElementSquare (ElementType *);
static void *SetElementSquare (ElementType *);
static void *ClrElementSquare (ElementType *);
static void *ChangeElementOctagon (ElementType *);
static void *SetElementOctagon (ElementType *);
static void *ClrElementOctagon (ElementType *);
static void *ChangePinSquare (ElementType *, PinType *);
static void *SetPinSquare (ElementType *, PinType *);
static void *ClrPinSquare (ElementType *, PinType *);
static void *ChangePinOctagon (ElementType *, PinType *);
static void *SetPinOctagon (ElementType *, PinType *);
static void *ClrPinOctagon (ElementType *, PinType *);
static void *ChangeViaOctagon (PinType *);
static void *SetViaOctagon (PinType *);
static void *ClrViaOctagon (PinType *);
static void *ChangePadSquare (ElementType *, PadType *);
static void *SetPadSquare (ElementType *, PadType *);
static void *ClrPadSquare (ElementType *, PadType *);
static void *ChangeViaThermal (PinType *);
static void *ChangePinThermal (ElementType *, PinType *);
static void *ChangeLineJoin (LayerType *, LineType *);
static void *SetLineJoin (LayerType *, LineType *);
static void *ClrLineJoin (LayerType *, LineType *);
static void *ChangeArcJoin (LayerType *, ArcType *);
static void *SetArcJoin (LayerType *, ArcType *);
static void *ClrArcJoin (LayerType *, ArcType *);
static void *ChangeTextJoin (LayerType *, TextType *);
static void *SetTextJoin (LayerType *, TextType *);
static void *ClrTextJoin (LayerType *, TextType *);
static void *ChangePolyClear (LayerType *, PolygonType *);

/* ---------------------------------------------------------------------------
 * some local identifiers
 */
/*! Either the new value or the change in value  */
static int Value; 
/*! Used as boolean to indicate that Value is an absolute or delta */
static int Absolute; 
static char *NewName;		/* new name */
static ObjectFunctionType ChangeSizeFunctions = {
  ChangeLineSize,
  ChangeTextSize,
  ChangePolyClear,
  ChangeViaSize,
  ChangeElementSize,		/* changes silk screen line width */
  ChangeElementNameSize,
  ChangePinSize,
  ChangePadSize,
  NULL,
  NULL,
  ChangeArcSize,
  NULL
};
static ObjectFunctionType Change2ndSizeFunctions = {
  NULL,
  NULL,
  NULL,
  ChangeVia2ndSize,
  ChangeElement2ndSize,
  NULL,
  ChangePin2ndSize,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ChangeThermalFunctions = {
  NULL,
  NULL,
  NULL,
  ChangeViaThermal,
  NULL,
  NULL,
  ChangePinThermal,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ChangeClearSizeFunctions = {
  ChangeLineClearSize,
  NULL,
  ChangePolygonClearSize, /* just to tell the user not to :-) */
  ChangeViaClearSize,
  NULL,
  NULL,
  ChangePinClearSize,
  ChangePadClearSize,
  NULL,
  NULL,
  ChangeArcClearSize,
  NULL
};
static ObjectFunctionType ChangeNameFunctions = {
  ChangeLineName,
  ChangeTextName,
  NULL,
  ChangeViaName,
  ChangeElementName,
  NULL,
  ChangePinName,
  ChangePadName,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ChangeSquareFunctions = {
  NULL,
  NULL,
  NULL,
  NULL,
  ChangeElementSquare,
  NULL,
  ChangePinSquare,
  ChangePadSquare,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ChangeJoinFunctions = {
  ChangeLineJoin,
  ChangeTextJoin,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  ChangeArcJoin,
  NULL
};
static ObjectFunctionType ChangeOctagonFunctions = {
  NULL,
  NULL,
  NULL,
  ChangeViaOctagon,
  ChangeElementOctagon,
  NULL,
  ChangePinOctagon,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ChangeMaskSizeFunctions = {
  NULL,
  NULL,
  NULL,
  ChangeViaMaskSize,
#if 0
  ChangeElementMaskSize,
#else
  NULL,
#endif
  NULL,
  ChangePinMaskSize,
  ChangePadMaskSize,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType SetSquareFunctions = {
  NULL,
  NULL,
  NULL,
  NULL,
  SetElementSquare,
  NULL,
  SetPinSquare,
  SetPadSquare,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType SetJoinFunctions = {
  SetLineJoin,
  SetTextJoin,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  SetArcJoin,
  NULL
};
static ObjectFunctionType SetOctagonFunctions = {
  NULL,
  NULL,
  NULL,
  SetViaOctagon,
  SetElementOctagon,
  NULL,
  SetPinOctagon,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ClrSquareFunctions = {
  NULL,
  NULL,
  NULL,
  NULL,
  ClrElementSquare,
  NULL,
  ClrPinSquare,
  ClrPadSquare,
  NULL,
  NULL,
  NULL,
  NULL
};
static ObjectFunctionType ClrJoinFunctions = {
  ClrLineJoin,
  ClrTextJoin,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL,
  ClrArcJoin,
  NULL
};
static ObjectFunctionType ClrOctagonFunctions = {
  NULL,
  NULL,
  NULL,
  ClrViaOctagon,
  ClrElementOctagon,
  NULL,
  ClrPinOctagon,
  NULL,
  NULL,
  NULL,
  NULL,
  NULL
};

/*!
 * \brief Changes the thermal on a via.
 *
 * \return TRUE if changed.
 */
static void *
ChangeViaThermal (PinType *Via)
{
  AddObjectToClearPolyUndoList (VIA_TYPE, Via, Via, Via, false);
  RestoreToPolygon (PCB->Data, VIA_TYPE, CURRENT, Via);
  AddObjectToFlagUndoList (VIA_TYPE, Via, Via, Via);
  if (!Value)			/* remove the thermals */
    CLEAR_THERM (INDEXOFCURRENT, Via);
  else
    ASSIGN_THERM (INDEXOFCURRENT, Value, Via);
  AddObjectToClearPolyUndoList (VIA_TYPE, Via, Via, Via, true);
  ClearFromPolygon (PCB->Data, VIA_TYPE, CURRENT, Via);
  DrawVia (Via);
  return Via;
}

/*!
 * \brief Changes the thermal on a pin.
 *
 * \return TRUE if changed.
 */
static void *
ChangePinThermal (ElementType *element, PinType *Pin)
{
  AddObjectToClearPolyUndoList (PIN_TYPE, element, Pin, Pin, false);
  RestoreToPolygon (PCB->Data, VIA_TYPE, CURRENT, Pin);
  AddObjectToFlagUndoList (PIN_TYPE, element, Pin, Pin);
  if (!Value)			/* remove the thermals */
    CLEAR_THERM (INDEXOFCURRENT, Pin);
  else
    ASSIGN_THERM (INDEXOFCURRENT, Value, Pin);
  AddObjectToClearPolyUndoList (PIN_TYPE, element, Pin, Pin, true);
  ClearFromPolygon (PCB->Data, VIA_TYPE, CURRENT, Pin);
  DrawPin (Pin);
  return Pin;
}

/*!
 * \brief Changes the size of a via.
 *
 * \return TRUE if changed.
 */
static void *
ChangeViaSize (PinType *Via)
{
  Coord new_value = Absolute ? Value : Via->Thickness + Value;

  if (TEST_FLAG (LOCKFLAG, Via))
    return (NULL);
  if (!TEST_FLAG (HOLEFLAG, Via) && new_value <= MAX_PINORVIASIZE &&
      new_value >= MIN_PINORVIASIZE &&
      new_value > Via->DrillingHole &&
      new_value != Via->Thickness)
    {
      AddObjectToSizeUndoList (VIA_TYPE, Via, Via, Via);
      EraseVia (Via);
      r_delete_entry (PCB->Data->via_tree, (BoxType *) Via);
      RestoreToPolygon (PCB->Data, PIN_TYPE, Via, Via);
      if (Via->Mask)
	{
	  AddObjectToMaskSizeUndoList (VIA_TYPE, Via, Via, Via);
	  Via->Mask += new_value - Via->Thickness;
	}
      Via->Thickness = new_value;
      SetPinBoundingBox (Via);
      r_insert_entry (PCB->Data->via_tree, (BoxType *) Via, 0);
      ClearFromPolygon (PCB->Data, VIA_TYPE, Via, Via);
      DrawVia (Via);
      return (Via);
    }
  return (NULL);
}

/*!
 * \brief Changes the drilling hole of a via.
 *
 * \return TRUE if changed.
 */
static void *
ChangeVia2ndSize (PinType *Via)
{
  Coord new_value = (Absolute) ? Value : Via->DrillingHole + Value;

  if (TEST_FLAG (LOCKFLAG, Via))
    return (NULL);
  if (new_value <= MAX_PINORVIASIZE &&
      new_value >= MIN_PINORVIAHOLE && (TEST_FLAG (HOLEFLAG, Via) ||
				    new_value < Via->Thickness)
      && new_value != Via->DrillingHole)
    {
      AddObjectTo2ndSizeUndoList (VIA_TYPE, Via, Via, Via);
      EraseVia (Via);
      RestoreToPolygon (PCB->Data, VIA_TYPE, Via, Via);
      Via->DrillingHole = new_value;
      if (TEST_FLAG (HOLEFLAG, Via))
	{
	  AddObjectToSizeUndoList (VIA_TYPE, Via, Via, Via);
	  Via->Thickness = new_value;
	}
      ClearFromPolygon (PCB->Data, VIA_TYPE, Via, Via);
      DrawVia (Via);
      return (Via);
    }
  return (NULL);
}

/*!
 * \brief Changes the clearance size of a via.
 *
 * \return TRUE if changed.
 */
static void *
ChangeViaClearSize (PinType *Via)
{
  Coord new_value = (Absolute) ? Value : Via->Clearance + Value;

  if (TEST_FLAG (LOCKFLAG, Via))
    return (NULL);
  new_value = MIN (MAX_LINESIZE, new_value);
  if (new_value < 0)
    new_value = 0;
  if (Value < 0 && new_value < PCB->Bloat * 2)
    new_value = 0;
  if ((Value > 0 || Absolute) && new_value < PCB->Bloat * 2)
    new_value = PCB->Bloat * 2 + 2;
  if (Via->Clearance == new_value)
    return NULL;
  RestoreToPolygon (PCB->Data, VIA_TYPE, Via, Via);
  AddObjectToClearSizeUndoList (VIA_TYPE, Via, Via, Via);
  EraseVia (Via);
  r_delete_entry (PCB->Data->via_tree, (BoxType *) Via);
  Via->Clearance = new_value;
  SetPinBoundingBox (Via);
  r_insert_entry (PCB->Data->via_tree, (BoxType *) Via, 0);
  ClearFromPolygon (PCB->Data, VIA_TYPE, Via, Via);
  DrawVia (Via);
  Via->Element = NULL;
  return (Via);
}


/*!
 * \brief Changes the size of a pin.
 *
 * \return TRUE if changed.
 */
static void *
ChangePinSize (ElementType *Element, PinType *Pin)
{
  Coord new_value = (Absolute) ? Value : Pin->Thickness + Value;

  if (TEST_FLAG (LOCKFLAG, Pin))
    return (NULL);
  if (!TEST_FLAG (HOLEFLAG, Pin) && new_value <= MAX_PINORVIASIZE &&
      new_value >= MIN_PINORVIASIZE &&
      new_value > Pin->DrillingHole &&
      new_value != Pin->Thickness)
    {
      AddObjectToSizeUndoList (PIN_TYPE, Element, Pin, Pin);
      AddObjectToMaskSizeUndoList (PIN_TYPE, Element, Pin, Pin);
      ErasePin (Pin);
      r_delete_entry (PCB->Data->pin_tree, &Pin->BoundingBox);
      RestoreToPolygon (PCB->Data, PIN_TYPE, Element, Pin);
      Pin->Mask += new_value - Pin->Thickness;
      Pin->Thickness = new_value;
      /* SetElementBB updates all associated rtrees */
      SetElementBoundingBox (PCB->Data, Element, &PCB->Font);
      ClearFromPolygon (PCB->Data, PIN_TYPE, Element, Pin);
      DrawPin (Pin);
      return (Pin);
    }
  return (NULL);
}

/*!
 * \brief Changes the clearance size of a pin.
 *
 * \return TRUE if changed.
 */
static void *
ChangePinClearSize (ElementType *Element, PinType *Pin)
{
  Coord new_value = (Absolute) ? Value : Pin->Clearance + Value;

  if (TEST_FLAG (LOCKFLAG, Pin))
    return (NULL);
  new_value = MIN (MAX_LINESIZE, new_value);
  if (new_value < 0)
    new_value = 0;
  if (Value < 0 && new_value < PCB->Bloat * 2)
    new_value = 0;
  if ((Value > 0 || Absolute) && new_value < PCB->Bloat * 2)
    new_value = PCB->Bloat * 2 + 2;
  if (Pin->Clearance == new_value)
    return NULL;
  RestoreToPolygon (PCB->Data, PIN_TYPE, Element, Pin);
  AddObjectToClearSizeUndoList (PIN_TYPE, Element, Pin, Pin);
  ErasePin (Pin);
  r_delete_entry (PCB->Data->pin_tree, &Pin->BoundingBox);
  Pin->Clearance = new_value;
  /* SetElementBB updates all associated rtrees */
  SetElementBoundingBox (PCB->Data, Element, &PCB->Font);
  ClearFromPolygon (PCB->Data, PIN_TYPE, Element, Pin);
  DrawPin (Pin);
  return (Pin);
}

/*!
 * \brief Changes the size of a pad.
 *
 * \return TRUE if changed.
 */
static void *
ChangePadSize (ElementType *Element, PadType *Pad)
{
  Coord new_value = (Absolute) ? Value : Pad->Thickness + Value;

  if (TEST_FLAG (LOCKFLAG, Pad))
    return (NULL);
  if (new_value <= MAX_PADSIZE && new_value >= MIN_PADSIZE && new_value != Pad->Thickness)
    {
      AddObjectToSizeUndoList (PAD_TYPE, Element, Pad, Pad);
      AddObjectToMaskSizeUndoList (PAD_TYPE, Element, Pad, Pad);
      RestoreToPolygon (PCB->Data, PAD_TYPE, Element, Pad);
      ErasePad (Pad);
      r_delete_entry (PCB->Data->pad_tree, &Pad->BoundingBox);
      Pad->Mask += new_value - Pad->Thickness;
      Pad->Thickness = new_value;
      /* SetElementBB updates all associated rtrees */
      SetElementBoundingBox (PCB->Data, Element, &PCB->Font);
      ClearFromPolygon (PCB->Data, PAD_TYPE, Element, Pad);
      DrawPad (Pad);
      return (Pad);
    }
  return (NULL);
}

/*!
 * \brief Changes the clearance size of a pad.
 *
 * \return TRUE if changed.
 */
static void *
ChangePadClearSize (ElementType *Element, PadType *Pad)
{
  Coord new_value = (Absolute) ? Value : Pad->Clearance + Value;

  if (TEST_FLAG (LOCKFLAG, Pad))
    return (NULL);
  new_value = MIN (MAX_LINESIZE, new_value);
  if (new_value < 0)
    new_value = 0;
  if (Value < 0 && new_value < PCB->Bloat * 2)
    new_value = 0;
  if ((Value > 0 || Absolute) && new_value < PCB->Bloat * 2)
    new_value = PCB->Bloat * 2 + 2;
  if (new_value == Pad->Clearance)
    return NULL;
  AddObjectToClearSizeUndoList (PAD_TYPE, Element, Pad, Pad);
  RestoreToPolygon (PCB->Data, PAD_TYPE, Element, Pad);
  ErasePad (Pad);
  r_delete_entry (PCB->Data->pad_tree, &Pad->BoundingBox);
  Pad->Clearance = new_value;
  /* SetElementBB updates all associated rtrees */
  SetElementBoundingBox (PCB->Data, Element, &PCB->Font);
  ClearFromPolygon (PCB->Data, PAD_TYPE, Element, Pad);
  DrawPad (Pad);
  return Pad;
}

/*!
 * \brief Changes the drilling hole of all pins of an element.
 *
 * \return TRUE if changed.
 */
static void *
ChangeElement2ndSize (ElementType *Element)
{
  bool changed = false;
  Coord new_value;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    new_value = (Absolute) ? Value : pin->DrillingHole + Value;
    if (new_value <= MAX_PINORVIASIZE &&
	new_value >= MIN_PINORVIAHOLE && (TEST_FLAG (HOLEFLAG, pin) ||
				      new_value <= pin->Thickness)
	&& new_value != pin->DrillingHole)
      {
	changed = true;
	AddObjectTo2ndSizeUndoList (PIN_TYPE, Element, pin, pin);
	ErasePin (pin);
	RestoreToPolygon (PCB->Data, PIN_TYPE, Element, pin);
	pin->DrillingHole = new_value;
	if (TEST_FLAG (HOLEFLAG, pin))
	  {
	    AddObjectToSizeUndoList (PIN_TYPE, Element, pin, pin);
	    pin->Thickness = new_value;
	  }
	ClearFromPolygon (PCB->Data, PIN_TYPE, Element, pin);
	DrawPin (pin);
      }
  }
  END_LOOP;
  if (changed)
    return (Element);
  else
    return (NULL);
}

/*!
 * \brief Changes the drilling hole of a pin.
 *
 * \return TRUE if changed.
 */
static void *
ChangePin2ndSize (ElementType *Element, PinType *Pin)
{
  Coord new_value = (Absolute) ? Value : Pin->DrillingHole + Value;

  if (TEST_FLAG (LOCKFLAG, Pin))
    return (NULL);
  if (new_value <= MAX_PINORVIASIZE &&
      new_value >= MIN_PINORVIAHOLE && (TEST_FLAG (HOLEFLAG, Pin) ||
				    new_value < Pin->Thickness)
      && new_value != Pin->DrillingHole)
    {
      AddObjectTo2ndSizeUndoList (PIN_TYPE, Element, Pin, Pin);
      ErasePin (Pin);
      RestoreToPolygon (PCB->Data, PIN_TYPE, Element, Pin);
      Pin->DrillingHole = new_value;
      if (TEST_FLAG (HOLEFLAG, Pin))
	{
	  AddObjectToSizeUndoList (PIN_TYPE, Element, Pin, Pin);
	  Pin->Thickness = new_value;
	}
      ClearFromPolygon (PCB->Data, PIN_TYPE, Element, Pin);
      DrawPin (Pin);
      return (Pin);
    }
  return (NULL);
}

/*!
 * \brief Changes the size of a line.
 *
 * \return TRUE if changed.
 */
static void *
ChangeLineSize (LayerType *Layer, LineType *Line)
{
  Coord new_value = (Absolute) ? Value : Line->Thickness + Value;

  if (TEST_FLAG (LOCKFLAG, Line))
    return (NULL);
  if (new_value <= MAX_LINESIZE && new_value >= MIN_LINESIZE &&
      new_value != Line->Thickness)
    {
      AddObjectToSizeUndoList (LINE_TYPE, Layer, Line, Line);
      EraseLine (Line);
      r_delete_entry (Layer->line_tree, (BoxType *) Line);
      RestoreToPolygon (PCB->Data, LINE_TYPE, Layer, Line);
      Line->Thickness = new_value;
      SetLineBoundingBox (Line);
      r_insert_entry (Layer->line_tree, (BoxType *) Line, 0);
      ClearFromPolygon (PCB->Data, LINE_TYPE, Layer, Line);
      DrawLine (Layer, Line);
      return (Line);
    }
  return (NULL);
}

/*!
 * \brief Changes the clearance size of a line.
 *
 * \return TRUE if changed.
 */
static void *
ChangeLineClearSize (LayerType *Layer, LineType *Line)
{
  Coord new_value = (Absolute) ? Value : Line->Clearance + Value;

  if (TEST_FLAG (LOCKFLAG, Line) || !TEST_FLAG (CLEARLINEFLAG, Line))
    return (NULL);
  new_value = MIN (MAX_LINESIZE, MAX (new_value, PCB->Bloat * 2 + 2));
  if (new_value != Line->Clearance)
    {
      AddObjectToClearSizeUndoList (LINE_TYPE, Layer, Line, Line);
      RestoreToPolygon (PCB->Data, LINE_TYPE, Layer, Line);
      EraseLine (Line);
      r_delete_entry (Layer->line_tree, (BoxType *) Line);
      Line->Clearance = new_value;
      if (Line->Clearance == 0)
	{
	  CLEAR_FLAG (CLEARLINEFLAG, Line);
	  Line->Clearance = MIL_TO_COORD(10);
	}
      SetLineBoundingBox (Line);
      r_insert_entry (Layer->line_tree, (BoxType *) Line, 0);
      ClearFromPolygon (PCB->Data, LINE_TYPE, Layer, Line);
      DrawLine (Layer, Line);
      return (Line);
    }
  return (NULL);
}

/*!
 * \brief Handle attempts to change the clearance of a polygon.
 */
static void *
ChangePolygonClearSize (LayerType *Layer, PolygonType *poly)
{
  static int shown_this_message = 0;
  if (!shown_this_message)
    {
      gui->confirm_dialog (_("To change the clearance of objects in a polygon, "
			   "change the objects, not the polygon.\n"
			   "Hint: To set a minimum clearance for a group of objects, "
			   "select them all then :MinClearGap(Selected,=10,mil)"),
			   "Ok", NULL);
      shown_this_message = 1;
    }

  return (NULL);
}

/*!
 * \brief Changes the size of an arc.
 *
 * \return TRUE if changed.
 */
static void *
ChangeArcSize (LayerType *Layer, ArcType *Arc)
{
  Coord new_value = (Absolute) ? Value : Arc->Thickness + Value;

  if (TEST_FLAG (LOCKFLAG, Arc))
    return (NULL);
  if (new_value <= MAX_LINESIZE && new_value >= MIN_LINESIZE &&
      new_value != Arc->Thickness)
    {
      AddObjectToSizeUndoList (ARC_TYPE, Layer, Arc, Arc);
      EraseArc (Arc);
      r_delete_entry (Layer->arc_tree, (BoxType *) Arc);
      RestoreToPolygon (PCB->Data, ARC_TYPE, Layer, Arc);
      Arc->Thickness = new_value;
      SetArcBoundingBox (Arc);
      r_insert_entry (Layer->arc_tree, (BoxType *) Arc, 0);
      ClearFromPolygon (PCB->Data, ARC_TYPE, Layer, Arc);
      DrawArc (Layer, Arc);
      return (Arc);
    }
  return (NULL);
}

/*!
 * \brief Changes the clearance size of an arc.
 *
 * \return TRUE if changed.
 */
static void *
ChangeArcClearSize (LayerType *Layer, ArcType *Arc)
{
  Coord new_value = (Absolute) ? Value : Arc->Clearance + Value;

  if (TEST_FLAG (LOCKFLAG, Arc) || !TEST_FLAG (CLEARLINEFLAG, Arc))
    return (NULL);
  new_value = MIN (MAX_LINESIZE, MAX (new_value, PCB->Bloat * 2 + 2));
  if (new_value != Arc->Clearance)
    {
      AddObjectToClearSizeUndoList (ARC_TYPE, Layer, Arc, Arc);
      EraseArc (Arc);
      r_delete_entry (Layer->arc_tree, (BoxType *) Arc);
      RestoreToPolygon (PCB->Data, ARC_TYPE, Layer, Arc);
      Arc->Clearance = new_value;
      if (Arc->Clearance == 0)
	{
	  CLEAR_FLAG (CLEARLINEFLAG, Arc);
	  Arc->Clearance = MIL_TO_COORD(10);
	}
      SetArcBoundingBox (Arc);
      r_insert_entry (Layer->arc_tree, (BoxType *) Arc, 0);
      ClearFromPolygon (PCB->Data, ARC_TYPE, Layer, Arc);
      DrawArc (Layer, Arc);
      return (Arc);
    }
  return (NULL);
}

/*!
 * \brief Changes the scaling factor of a text object.
 *
 * \return TRUE if changed.
 */
static void *
ChangeTextSize (LayerType *Layer, TextType *Text)
{
  int new_value = (Absolute != 0 ? 0 : Text->Scale) +
              (double)(Absolute != 0 ? Value : Value)
                / (double)FONT_CAPHEIGHT * 100.;

  if (TEST_FLAG (LOCKFLAG, Text))
    return (NULL);
  if (new_value <= MAX_TEXTSCALE && new_value >= MIN_TEXTSCALE &&
      new_value != Text->Scale)
    {
      AddObjectToSizeUndoList (TEXT_TYPE, Layer, Text, Text);
      EraseText (Layer, Text);
      r_delete_entry (Layer->text_tree, (BoxType *) Text);
      RestoreToPolygon (PCB->Data, TEXT_TYPE, Layer, Text);
      Text->Scale = new_value;
      SetTextBoundingBox (&PCB->Font, Text);
      r_insert_entry (Layer->text_tree, (BoxType *) Text, 0);
      ClearFromPolygon (PCB->Data, TEXT_TYPE, Layer, Text);
      DrawText (Layer, Text);
      return (Text);
    }
  return (NULL);
}

/*!
 * \brief Changes the scaling factor of an element's outline.
 *
 * \return TRUE if changed.
 */
static void *
ChangeElementSize (ElementType *Element)
{
  Coord new_value;
  bool changed = false;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  if (PCB->ElementOn)
    EraseElement (Element);
  ELEMENTLINE_LOOP (Element);
  {
    new_value = (Absolute) ? Value : line->Thickness + Value;
    if (new_value <= MAX_LINESIZE && new_value >= MIN_LINESIZE &&
	new_value != line->Thickness)
      {
	AddObjectToSizeUndoList (ELEMENTLINE_TYPE, Element, line, line);
	line->Thickness = new_value;
	changed = true;
      }
  }
  END_LOOP;
  ARC_LOOP (Element);
  {
    new_value = (Absolute) ? Value : arc->Thickness + Value;
    if (new_value <= MAX_LINESIZE && new_value >= MIN_LINESIZE &&
	new_value != arc->Thickness)
      {
	AddObjectToSizeUndoList (ELEMENTARC_TYPE, Element, arc, arc);
	arc->Thickness = new_value;
	changed = true;
      }
  }
  END_LOOP;
  if (PCB->ElementOn)
    {
      DrawElement (Element);
    }
  if (changed)
    return (Element);
  return (NULL);
}

/*!
 * \brief Changes the scaling factor of a elementname object.
 *
 * \return TRUE if changed.
 */
static void *
ChangeElementNameSize (ElementType *Element)
{
  int new_value = (Absolute != 0 ? 0 : DESCRIPTION_TEXT (Element).Scale) +
              (double)(Absolute != 0 ? Value : Value)
                / (double)FONT_CAPHEIGHT * 100.;

  if (TEST_FLAG (LOCKFLAG, &Element->Name[0]))
    return (NULL);
  if (new_value <= MAX_TEXTSCALE && new_value >= MIN_TEXTSCALE)
    {
      EraseElementName (Element);
      ELEMENTTEXT_LOOP (Element);
      {
	AddObjectToSizeUndoList (ELEMENTNAME_TYPE, Element, text, text);
	r_delete_entry (PCB->Data->name_tree[n], (BoxType *) text);
	text->Scale = new_value;
	SetTextBoundingBox (&PCB->Font, text);
	r_insert_entry (PCB->Data->name_tree[n], (BoxType *) text, 0);
      }
      END_LOOP;
      DrawElementName (Element);
      return (Element);
    }
  return (NULL);
}

/*!
 * \brief Changes the name of a via.
 */
static void *
ChangeViaName (PinType *Via)
{
  char *old = Via->Name;

  if (TEST_FLAG (DISPLAYNAMEFLAG, Via))
    {
      ErasePinName (Via);
      Via->Name = NewName;
      DrawPinName (Via);
    }
  else
    Via->Name = NewName;
  return (old);
}

/*!
 * \brief Changes the name of a pin.
 */
static void *
ChangePinName (ElementType *Element, PinType *Pin)
{
  char *old = Pin->Name;

  (void) Element;		/* get rid of 'unused...' warnings */
  if (TEST_FLAG (DISPLAYNAMEFLAG, Pin))
    {
      ErasePinName (Pin);
      Pin->Name = NewName;
      DrawPinName (Pin);
    }
  else
    Pin->Name = NewName;
  return (old);
}

/*!
 * \brief Changes the name of a pad.
 */
static void *
ChangePadName (ElementType *Element, PadType *Pad)
{
  char *old = Pad->Name;

  (void) Element;		/* get rid of 'unused...' warnings */
  if (TEST_FLAG (DISPLAYNAMEFLAG, Pad))
    {
      ErasePadName (Pad);
      Pad->Name = NewName;
      DrawPadName (Pad);
    }
  else
    Pad->Name = NewName;
  return (old);
}

/*!
 * \brief Changes the name of a line.
 */
static void *
ChangeLineName (LayerType *Layer, LineType *Line)
{
  char *old = Line->Number;

  (void) Layer;
  Line->Number = NewName;
  return (old);
}

/*!
 * \brief Changes the layout-name of an element.
 * 
 * Change the specified text on an element, either on the board (give
 * PCB, PCB->Data) or in a buffer (give NULL, Buffer->Data).
 *
 * \return The old string is returned, and must be properly freed by the
 * caller.
 */
char *
ChangeElementText (PCBType *pcb, DataType *data, ElementType *Element, int which, char *new_name)
{
  char *old = Element->Name[which].TextString;

#ifdef DEBUG
  printf("In ChangeElementText, updating old TextString %s to %s\n", old, new_name);
#endif

  if (pcb && which == NAME_INDEX (pcb))
    EraseElementName (Element);

  r_delete_entry (data->name_tree[which],
		  & Element->Name[which].BoundingBox);

  Element->Name[which].TextString = new_name;
  SetTextBoundingBox (&PCB->Font, &Element->Name[which]);

  r_insert_entry (data->name_tree[which],
		  & Element->Name[which].BoundingBox, 0);

  if (pcb && which == NAME_INDEX (pcb))
    DrawElementName (Element);

  return old;
}

static void *
ChangeElementName (ElementType *Element)
{
  if (TEST_FLAG (LOCKFLAG, &Element->Name[0]))
    return (NULL);
  if (NAME_INDEX (PCB) == NAMEONPCB_INDEX)
    {
      if (TEST_FLAG (UNIQUENAMEFLAG, PCB) &&
	  UniqueElementName (PCB->Data, NewName) != NewName)
	{
	  Message (_("Error: The name \"%s\" is not unique!\n"), NewName);
	  return ((char *) -1);
	}
    }

  return ChangeElementText (PCB, PCB->Data, Element, NAME_INDEX (PCB), NewName);
}

/*!
 * \brief Sets data of a text object and calculates bounding box.
 *
 * Memory must have already been allocated.
 * The one for the new string is allocated.
 *
 * \return True if the string has been changed.
 */
static void *
ChangeTextName (LayerType *Layer, TextType *Text)
{
  char *old = Text->TextString;

  if (TEST_FLAG (LOCKFLAG, Text))
    return (NULL);
  EraseText (Layer, Text);
  r_delete_entry (Layer->text_tree, (BoxType *) Text);
  RestoreToPolygon (PCB->Data, TEXT_TYPE, Layer, Text);
  Text->TextString = NewName;

  /* calculate size of the bounding box */
  SetTextBoundingBox (&PCB->Font, Text);
  r_insert_entry(Layer->text_tree, (BoxType *) Text, 0);
  ClearFromPolygon (PCB->Data, TEXT_TYPE, Layer, Text);
  DrawText (Layer, Text);
  return (old);
}

/*!
 * \brief Changes the name of a layout; memory has to be already
 * allocated.
 */
bool
ChangeLayoutName (char *Name)
{
  free (PCB->Name);
  PCB->Name = Name;
  hid_action ("PCBChanged");
  return (true);
}

/*!
 * \brief Changes the side of the board an element is on.
 *
 * \return TRUE if done.
 */
bool
ChangeElementSide (ElementType *Element, Coord yoff)
{
  if (TEST_FLAG (LOCKFLAG, Element))
    return (false);
  EraseElement (Element);
  AddObjectToMirrorUndoList (ELEMENT_TYPE, Element, Element, Element, yoff);
  MirrorElementCoordinates (PCB->Data, Element, yoff);
  DrawElement (Element);
  return (true);
}

/*!
 * \brief Changes the name of a layer; memory has to be already
 * allocated.
 */
bool
ChangeLayerName (LayerType *Layer, char *Name)
{
  free (CURRENT->Name);
  CURRENT->Name = Name;
  hid_action ("LayersChanged");
  return (true);
}

/*!
 * \brief Changes the clearance flag of a line.
 */
static void *
ChangeLineJoin (LayerType *Layer, LineType *Line)
{
  if (TEST_FLAG (LOCKFLAG, Line))
    return (NULL);
  EraseLine (Line);
  if (TEST_FLAG(CLEARLINEFLAG, Line))
  {
  AddObjectToClearPolyUndoList (LINE_TYPE, Layer, Line, Line, false);
  RestoreToPolygon (PCB->Data, LINE_TYPE, Layer, Line);
  }
  AddObjectToFlagUndoList (LINE_TYPE, Layer, Line, Line);
  TOGGLE_FLAG (CLEARLINEFLAG, Line);
  if (TEST_FLAG(CLEARLINEFLAG, Line))
  {
  AddObjectToClearPolyUndoList (LINE_TYPE, Layer, Line, Line, true);
  ClearFromPolygon (PCB->Data, LINE_TYPE, Layer, Line);
  }
  DrawLine (Layer, Line);
  return (Line);
}

/*!
 * \brief Sets the clearance flag of a line.
 */
static void *
SetLineJoin (LayerType *Layer, LineType *Line)
{
  if (TEST_FLAG (LOCKFLAG, Line) || TEST_FLAG (CLEARLINEFLAG, Line))
    return (NULL);
  return ChangeLineJoin (Layer, Line);
}

/*!
 * \brief Clears the clearance flag of a line.
 */
static void *
ClrLineJoin (LayerType *Layer, LineType *Line)
{
  if (TEST_FLAG (LOCKFLAG, Line) || !TEST_FLAG (CLEARLINEFLAG, Line))
    return (NULL);
  return ChangeLineJoin (Layer, Line);
}

/*!
 * \brief Changes the clearance flag of an arc.
 */
static void *
ChangeArcJoin (LayerType *Layer, ArcType *Arc)
{
  if (TEST_FLAG (LOCKFLAG, Arc))
    return (NULL);
  EraseArc (Arc);
  if (TEST_FLAG (CLEARLINEFLAG, Arc))
  {
    RestoreToPolygon (PCB->Data, ARC_TYPE, Layer, Arc);
    AddObjectToClearPolyUndoList (ARC_TYPE, Layer, Arc, Arc, false);
    }
  AddObjectToFlagUndoList (ARC_TYPE, Layer, Arc, Arc);
  TOGGLE_FLAG (CLEARLINEFLAG, Arc);
  if (TEST_FLAG (CLEARLINEFLAG, Arc))
  {
    ClearFromPolygon (PCB->Data, ARC_TYPE, Layer, Arc);
  AddObjectToClearPolyUndoList (ARC_TYPE, Layer, Arc, Arc, true);
  }
  DrawArc (Layer, Arc);
  return (Arc);
}

/*!
 * \brief Sets the clearance flag of an arc.
 */
static void *
SetArcJoin (LayerType *Layer, ArcType *Arc)
{
  if (TEST_FLAG (LOCKFLAG, Arc) || TEST_FLAG (CLEARLINEFLAG, Arc))
    return (NULL);
  return ChangeArcJoin (Layer, Arc);
}

/*!
 * \brief Clears the clearance flag of an arc.
 */
static void *
ClrArcJoin (LayerType *Layer, ArcType *Arc)
{
  if (TEST_FLAG (LOCKFLAG, Arc) || !TEST_FLAG (CLEARLINEFLAG, Arc))
    return (NULL);
  return ChangeArcJoin (Layer, Arc);
}

/*!
 * \brief Changes the clearance flag of a text.
 */
static void *
ChangeTextJoin (LayerType *Layer, TextType *Text)
{
  if (TEST_FLAG (LOCKFLAG, Text))
    return (NULL);
  EraseText (Layer, Text);
  if (TEST_FLAG(CLEARLINEFLAG, Text))
  {
  AddObjectToClearPolyUndoList (TEXT_TYPE, Layer, Text, Text, false);
  RestoreToPolygon (PCB->Data, TEXT_TYPE, Layer, Text);
  }
  AddObjectToFlagUndoList (TEXT_TYPE, Layer, Text, Text);
  TOGGLE_FLAG (CLEARLINEFLAG, Text);
  if (TEST_FLAG(CLEARLINEFLAG, Text))
  {
  AddObjectToClearPolyUndoList (TEXT_TYPE, Layer, Text, Text, true);
  ClearFromPolygon (PCB->Data, TEXT_TYPE, Layer, Text);
  }
  DrawText (Layer, Text);
  return (Text);
}

/*!
 * \brief Sets the clearance flag of a text.
 */
static void *
SetTextJoin (LayerType *Layer, TextType *Text)
{
  if (TEST_FLAG (LOCKFLAG, Text) || TEST_FLAG (CLEARLINEFLAG, Text))
    return (NULL);
  return ChangeTextJoin (Layer, Text);
}

/*!
 * \brief Clears the clearance flag of a text.
 */
static void *
ClrTextJoin (LayerType *Layer, TextType *Text)
{
  if (TEST_FLAG (LOCKFLAG, Text) || !TEST_FLAG (CLEARLINEFLAG, Text))
    return (NULL);
  return ChangeTextJoin (Layer, Text);
}

/*!
 * \brief Changes the square flag of all pins on an element.
 */
static void *
ChangeElementSquare (ElementType *Element)
{
  void *ans = NULL;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    ans = ChangePinSquare (Element, pin);
  }
  END_LOOP;
  PAD_LOOP (Element);
  {
    ans = ChangePadSquare (Element, pad);
  }
  END_LOOP;
  return (ans);
}

/*!
 * \brief Sets the square flag of all pins on an element.
 */
static void *
SetElementSquare (ElementType *Element)
{
  void *ans = NULL;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    ans = SetPinSquare (Element, pin);
  }
  END_LOOP;
  PAD_LOOP (Element);
  {
    ans = SetPadSquare (Element, pad);
  }
  END_LOOP;
  return (ans);
}

/*!
 * \brief Clears the square flag of all pins on an element.
 */
static void *
ClrElementSquare (ElementType *Element)
{
  void *ans = NULL;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    ans = ClrPinSquare (Element, pin);
  }
  END_LOOP;
  PAD_LOOP (Element);
  {
    ans = ClrPadSquare (Element, pad);
  }
  END_LOOP;
  return (ans);
}

/*!
 * \brief Changes the octagon flags of all pins of an element.
 */
static void *
ChangeElementOctagon (ElementType *Element)
{
  void *result = NULL;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    ChangePinOctagon (Element, pin);
    result = Element;
  }
  END_LOOP;
  return (result);
}

/*!
 * \brief Sets the octagon flags of all pins of an element.
 */
static void *
SetElementOctagon (ElementType *Element)
{
  void *result = NULL;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    SetPinOctagon (Element, pin);
    result = Element;
  }
  END_LOOP;
  return (result);
}

/*!
 * \brief Clears the octagon flags of all pins of an element.
 */
static void *
ClrElementOctagon (ElementType *Element)
{
  void *result = NULL;

  if (TEST_FLAG (LOCKFLAG, Element))
    return (NULL);
  PIN_LOOP (Element);
  {
    ClrPinOctagon (Element, pin);
    result = Element;
  }
  END_LOOP;
  return (result);
}

/*!
 * \brief Changes the square flag of a pad.
 */
static void *
ChangePadSquare (ElementType *Element, PadType *Pad)
{
  if (TEST_FLAG (LOCKFLAG, Pad))
    return (NULL);
  ErasePad (Pad);
  AddObjectToClearPolyUndoList (PAD_TYPE, Element, Pad, Pad, false);
  RestoreToPolygon (PCB->Data, PAD_TYPE, Element, Pad);
  AddObjectToFlagUndoList (PAD_TYPE, Element, Pad, Pad);
  TOGGLE_FLAG (SQUAREFLAG, Pad);
  AddObjectToClearPolyUndoList (PAD_TYPE, Element, Pad, Pad, true);
  ClearFromPolygon (PCB->Data, PAD_TYPE, Element, Pad);
  DrawPad (Pad);
  return (Pad);
}

/*!
 * \brief Sets the square flag of a pad.
 */
static void *
SetPadSquare (ElementType *Element, PadType *Pad)
{

  if (TEST_FLAG (LOCKFLAG, Pad) || TEST_FLAG (SQUAREFLAG, Pad))
    return (NULL);

  return (ChangePadSquare (Element, Pad));
}


/*!
 * \brief Clears the square flag of a pad.
 */
static void *
ClrPadSquare (ElementType *Element, PadType *Pad)
{

  if (TEST_FLAG (LOCKFLAG, Pad) || !TEST_FLAG (SQUAREFLAG, Pad))
    return (NULL);

  return (ChangePadSquare (Element, Pad));
}


/*!
 * \brief Changes the square flag of a pin.
 */
static void *
ChangePinSquare (ElementType *Element, PinType *Pin)
{
  if (TEST_FLAG (LOCKFLAG, Pin))
    return (NULL);
  ErasePin (Pin);
  AddObjectToClearPolyUndoList (PIN_TYPE, Element, Pin, Pin, false);
  RestoreToPolygon (PCB->Data, PIN_TYPE, Element, Pin);
  AddObjectToFlagUndoList (PIN_TYPE, Element, Pin, Pin);
  TOGGLE_FLAG (SQUAREFLAG, Pin);
  AddObjectToClearPolyUndoList (PIN_TYPE, Element, Pin, Pin, true);
  ClearFromPolygon (PCB->Data, PIN_TYPE, Element, Pin);
  DrawPin (Pin);
  return (Pin);
}

/*!
 * \brief Sets the square flag of a pin.
 */
static void *
SetPinSquare (ElementType *Element, PinType *Pin)
{
  if (TEST_FLAG (LOCKFLAG, Pin) || TEST_FLAG (SQUAREFLAG, Pin))
    return (NULL);

  return (ChangePinSquare (Element, Pin));
}

/*!
 * \brief Clears the square flag of a pin.
 */
static void *
ClrPinSquare (ElementType *Element, PinType *Pin)
{
  if (TEST_FLAG (LOCKFLAG, Pin) || !TEST_FLAG (SQUAREFLAG, Pin))
    return (NULL);

  return (ChangePinSquare (Element, Pin));
}

/*!
 * \brief Changes the octagon flag of a via.
 */
static void *
ChangeViaOctagon (PinType *Via)
{
  if (TEST_FLAG (LOCKFLAG, Via))
    return (NULL);
  EraseVia (Via);
  AddObjectToClearPolyUndoList (VIA_TYPE, Via, Via, Via, false);
  RestoreToPolygon (PCB->Data, VIA_TYPE, Via, Via);
  AddObjectToFlagUndoList (VIA_TYPE, Via, Via, Via);
  TOGGLE_FLAG (OCTAGONFLAG, Via);
  AddObjectToClearPolyUndoList (VIA_TYPE, Via, Via, Via, true);
  ClearFromPolygon (PCB->Data, VIA_TYPE, Via, Via);
  DrawVia (Via);
  return (Via);
}

/*!
 * \brief Sets the octagon flag of a via.
 */
static void *
SetViaOctagon (PinType *Via)
{
  if (TEST_FLAG (LOCKFLAG, Via) || TEST_FLAG (OCTAGONFLAG, Via))
    return (NULL);

  return (ChangeViaOctagon (Via));
}

/*!
 * \brief Clears the octagon flag of a via.
 */
static void *
ClrViaOctagon (PinType *Via)
{
  if (TEST_FLAG (LOCKFLAG, Via) || !TEST_FLAG (OCTAGONFLAG, Via))
    return (NULL);

  return (ChangeViaOctagon (Via));
}

/*!
 * \brief Changes the octagon flag of a pin.
 */
static void *
ChangePinOctagon (ElementType *Element, PinType *Pin)
{
  if (TEST_FLAG (LOCKFLAG, Pin))
    return (NULL);
  ErasePin (Pin);
  AddObjectToClearPolyUndoList (PIN_TYPE, Element, Pin, Pin, false);
  RestoreToPolygon (PCB->Data, PIN_TYPE, Element, Pin);
  AddObjectToFlagUndoList (PIN_TYPE, Element, Pin, Pin);
  TOGGLE_FLAG (OCTAGONFLAG, Pin);
  AddObjectToClearPolyUndoList (PIN_TYPE, Element, Pin, Pin, true);
  ClearFromPolygon (PCB->Data, PIN_TYPE, Element, Pin);
  DrawPin (Pin);
  return (Pin);
}

/*!
 * \brief Sets the octagon flag of a pin.
 */
static void *
SetPinOctagon (ElementType *Element, PinType *Pin)
{
  if (TEST_FLAG (LOCKFLAG, Pin) || TEST_FLAG (OCTAGONFLAG, Pin))
    return (NULL);

  return (ChangePinOctagon (Element, Pin));
}

/*!
 * \brief Clears the octagon flag of a pin.
 */
static void *
ClrPinOctagon (ElementType *Element, PinType *Pin)
{
  if (TEST_FLAG (LOCKFLAG, Pin) || !TEST_FLAG (OCTAGONFLAG, Pin))
    return (NULL);

  return (ChangePinOctagon (Element, Pin));
}

/*!
 * \brief Changes the hole flag of a via.
 */
bool
ChangeHole (PinType *Via)
{
  if (TEST_FLAG (LOCKFLAG, Via))
    return (false);
  EraseVia (Via);
  AddObjectToFlagUndoList (VIA_TYPE, Via, Via, Via);
  AddObjectToMaskSizeUndoList (VIA_TYPE, Via, Via, Via);
  r_delete_entry (PCB->Data->via_tree, (BoxType *) Via);
  RestoreToPolygon (PCB->Data, VIA_TYPE, Via, Via);
  TOGGLE_FLAG (HOLEFLAG, Via);

  if (TEST_FLAG (HOLEFLAG, Via))
    {
      /* A tented via becomes an minimally untented hole.  An untented
	 via retains its mask clearance.  */
      if (Via->Mask > Via->Thickness)
	{
	  Via->Mask = (Via->DrillingHole
		       + (Via->Mask - Via->Thickness));
	}
      else if (Via->Mask < Via->DrillingHole)
	{
	  Via->Mask = Via->DrillingHole + 2 * MASKFRAME;
	}
    }
  else
    {
      Via->Mask = (Via->Thickness
		   + (Via->Mask - Via->DrillingHole));
    }

  SetPinBoundingBox (Via);
  r_insert_entry (PCB->Data->via_tree, (BoxType *) Via, 0);
  ClearFromPolygon (PCB->Data, VIA_TYPE, Via, Via);
  DrawVia (Via);
  Draw ();
  return (true);
}

/*!
 * \brief Changes the nopaste flag of a pad.
 */
bool
ChangePaste (PadType *Pad)
{
  if (TEST_FLAG (LOCKFLAG, Pad))
    return (false);
  ErasePad (Pad);
  AddObjectToFlagUndoList (PAD_TYPE, Pad, Pad, Pad);
  TOGGLE_FLAG (NOPASTEFLAG, Pad);
  DrawPad (Pad);
  Draw ();
  return (true);
}

/*!
 * \brief Changes the CLEARPOLY flag of a polygon.
 */
static void *
ChangePolyClear (LayerType *Layer, PolygonType *Polygon)
{
  if (TEST_FLAG (LOCKFLAG, Polygon))
    return (NULL);
  AddObjectToClearPolyUndoList (POLYGON_TYPE, Layer, Polygon, Polygon, true);
  AddObjectToFlagUndoList (POLYGON_TYPE, Layer, Polygon, Polygon);
  TOGGLE_FLAG (CLEARPOLYFLAG, Polygon);
  InitClip (PCB->Data, Layer, Polygon);
  DrawPolygon (Layer, Polygon);
  return (Polygon);
}

/*!
 * \brief Changes the side of all selected and visible elements.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedElementSide (void)
{
  bool change = false;

  /* setup identifiers */
  if (PCB->PinOn && PCB->ElementOn)
    ELEMENT_LOOP (PCB->Data);
  {
    if (TEST_FLAG (SELECTEDFLAG, element))
      {
	change |= ChangeElementSide (element, 0);
      }
  }
  END_LOOP;
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the thermals on all selected and visible pins and/or
 * vias.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedThermals (int types, int therm_style)
{
  bool change = false;

  Value = therm_style;
  change = SelectedOperation (&ChangeThermalFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}


/*!
 * \brief Changes the thermals on all selected and visible pins and/or
 * vias.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedViaLayers (int from, int to)
{
  bool change = false;
  int new_from;
  int new_to;
  int i;

  VIA_LOOP (PCB->Data);
    {
      if (TEST_FLAG (LOCKFLAG, via))
        continue;
      if (TEST_FLAG (SELECTEDFLAG, via))
        {

          new_from = (from != -1)?from:via->BuriedFrom;
          new_to = (to != -1)?to:via->BuriedTo;

	  if (new_from == new_to)
	    continue;

          /* special case - changing TH via "from" layer sets "to" layer to bottom layer */
          if (!VIA_IS_BURIED (via)
               && (to == -1))
             new_to = GetMaxBottomLayer ();

          for (i=0; i < max_copper_layer; i++)
            {
              /* AddObjectToClearPolyUndoList (VIA_TYPE, &(PCB->Data->Layer[i]), via, via, false); not needed? */
              RestoreToPolygon (PCB->Data, VIA_TYPE, &(PCB->Data->Layer[i]), via);
            }

	    AddObjectToSetViaLayersUndoList (via, via, via);
            via->BuriedFrom = new_from;
            via->BuriedTo = new_to;

            if (VIA_IS_BURIED (via))
	      {
	        SanitizeBuriedVia (via);
                for (i=0; i < max_copper_layer; i++)
                  {
                    /* AddObjectToClearPolyUndoList (VIA_TYPE, &(PCB->Data->Layer[i]), via, via, true);  not needed? */
                    ClearFromPolygon (PCB->Data, VIA_TYPE, &(PCB->Data->Layer[i]), via);
                  }
                DrawVia (via);
	      }
            change = true;
	}
    }
  END_LOOP;
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the size of all selected and visible object types.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedSize (int types, Coord Difference, bool fixIt)
{
  bool change = false;

  /* setup identifiers */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;

  change = SelectedOperation (&ChangeSizeFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the clearance size of all selected and visible objects.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedClearSize (int types, Coord Difference, bool fixIt)
{
  bool change = false;

  /* setup identifiers */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;
  if (TEST_FLAG (SHOWMASKFLAG, PCB))
    change = SelectedOperation (&ChangeMaskSizeFunctions, false, types);
  else
    change = SelectedOperation (&ChangeClearSizeFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the 2nd size (drilling hole) of all selected and
 * visible objects.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelected2ndSize (int types, Coord Difference, bool fixIt)
{
  bool change = false;

  /* setup identifiers */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;
  change = SelectedOperation (&Change2ndSizeFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the clearance flag (join) of all selected and visible
 * lines and/or arcs.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedJoin (int types)
{
  bool change = false;

  change = SelectedOperation (&ChangeJoinFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the clearance flag (join) of all selected and visible
 * lines and/or arcs.
 *
 * \return True if anything has changed.
 */
bool
SetSelectedJoin (int types)
{
  bool change = false;

  change = SelectedOperation (&SetJoinFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the clearance flag (join) of all selected and visible
 * lines and/or arcs.
 *
 * \return True if anything has changed.
 */
bool
ClrSelectedJoin (int types)
{
  bool change = false;

  change = SelectedOperation (&ClrJoinFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the square-flag of all selected and visible pins or
 * pads.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedSquare (int types)
{
  bool change = false;

  change = SelectedOperation (&ChangeSquareFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Sets the square-flag of all selected and visible pins or pads.
 *
 * \return True if anything has changed.
 */
bool
SetSelectedSquare (int types)
{
  bool change = false;

  change = SelectedOperation (&SetSquareFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Clears the square-flag of all selected and visible pins or
 * pads.
 *
 * \return True if anything has changed.
 */
bool
ClrSelectedSquare (int types)
{
  bool change = false;

  change = SelectedOperation (&ClrSquareFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the octagon-flag of all selected and visible pins and
 * vias.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedOctagon (int types)
{
  bool change = false;

  change = SelectedOperation (&ChangeOctagonFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Sets the octagon-flag of all selected and visible pins and
 * vias.
 *
 * \return True if anything has changed.
 */
bool
SetSelectedOctagon (int types)
{
  bool change = false;

  change = SelectedOperation (&SetOctagonFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Clears the octagon-flag of all selected and visible pins and
 * vias.
 *
 * \return True if anything has changed.
 */
bool
ClrSelectedOctagon (int types)
{
  bool change = false;

  change = SelectedOperation (&ClrOctagonFunctions, false, types);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the hole-flag of all selected and visible vias.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedHole (void)
{
  bool change = false;

  if (PCB->ViaOn)
    VIA_LOOP (PCB->Data);
  {
    if (TEST_FLAG (SELECTEDFLAG, via))
      change |= ChangeHole (via);
  }
  END_LOOP;
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the no paste-flag of all selected and visible pads.
 *
 * \return True if anything has changed.
 */
bool
ChangeSelectedPaste (void)
{
  bool change = false;

  ALLPAD_LOOP (PCB->Data);
  {
    if (TEST_FLAG (SELECTEDFLAG, pad))
      change |= ChangePaste (pad);
  }
  ENDALL_LOOP;
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}


/*!
 * \brief Changes the size of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObjectSize (int Type, void *Ptr1, void *Ptr2, void *Ptr3,
		  Coord Difference, bool fixIt)
{
  bool change;

  /* setup identifier */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;
  change =
    (ObjectOperation (&ChangeSizeFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the clearance size of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObjectClearSize (int Type, void *Ptr1, void *Ptr2, void *Ptr3,
		       Coord Difference, bool fixIt)
{
  bool change;

  /* setup identifier */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;
  if (TEST_FLAG (SHOWMASKFLAG, PCB))
    change =
      (ObjectOperation (&ChangeMaskSizeFunctions, Type, Ptr1, Ptr2, Ptr3) !=
       NULL);
  else
    change =
      (ObjectOperation (&ChangeClearSizeFunctions, Type, Ptr1, Ptr2, Ptr3) !=
       NULL);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the thermal of the passed object.
 *
 * \return True if anything is changed.
 *
 */
bool
ChangeObjectThermal (int Type, void *Ptr1, void *Ptr2, void *Ptr3,
		     int therm_type)
{
  bool change;

  Value = Absolute = therm_type;
  change =
    (ObjectOperation (&ChangeThermalFunctions, Type, Ptr1, Ptr2, Ptr3) !=
     NULL);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the thermal of the passed object.
 *
 * \return True if anything is changed.
 *
 */
bool
ChangeObjectViaLayers (void *Ptr1, void *Ptr2, void *Ptr3,
		     int from, int to)
{
  bool change = false;
  PinType *via = (PinType *) Ptr1;
  int new_from = (from != -1)?from:via->BuriedFrom;
  int new_to = (to != -1)?to:via->BuriedTo;
  int i;

  if (TEST_FLAG (LOCKFLAG, via))
    return (NULL);

  if ((new_from == new_to)
      && new_from != 0)
    return false;

  /* special case - changing TH via "from" layer sets "to" layer to bottom layer */
  if (!VIA_IS_BURIED (via)
       && (to == -1))
     new_to = GetMaxBottomLayer ();

  for (i=0; i < max_copper_layer; i++)
    {
      /* AddObjectToClearPolyUndoList (VIA_TYPE, &(PCB->Data->Layer[i]), via, via, false);  not needed? */
      RestoreToPolygon (PCB->Data, VIA_TYPE, &(PCB->Data->Layer[i]), via);
    }

  if (from != -1 || to != -1)
    {
      AddObjectToSetViaLayersUndoList (via, via, via);
      change = true;
    }

  via->BuriedFrom = new_from;
  via->BuriedTo = new_to;

  if (VIA_IS_BURIED (via))
    {
      SanitizeBuriedVia (via);
      for (i=0; i < max_copper_layer; i++)
        {
          /* AddObjectToClearPolyUndoList (VIA_TYPE, &(PCB->Data->Layer[i]), via, via, true);  not needed? */
          ClearFromPolygon (PCB->Data, VIA_TYPE, &(PCB->Data->Layer[i]), via);
        }
      DrawVia (via);
    }

  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the 2nd size of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObject2ndSize (int Type, void *Ptr1, void *Ptr2, void *Ptr3,
		     Coord Difference, bool fixIt, bool incundo)
{
  bool change;

  /* setup identifier */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;
  change =
    (ObjectOperation (&Change2ndSizeFunctions, Type, Ptr1, Ptr2, Ptr3) !=
     NULL);
  if (change)
    {
      Draw ();
      if (incundo)
	IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the mask size of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObjectMaskSize (int Type, void *Ptr1, void *Ptr2, void *Ptr3,
		      Coord Difference, bool fixIt)
{
  bool change;

  /* setup identifier */
  Absolute = (fixIt) ? 1 : 0;
  Value = Difference;
  change =
    (ObjectOperation (&ChangeMaskSizeFunctions, Type, Ptr1, Ptr2, Ptr3) !=
     NULL);
  if (change)
    {
      Draw ();
      IncrementUndoSerialNumber ();
    }
  return (change);
}

/*!
 * \brief Changes the name of the passed object.
 *
 * \warning The allocated memory isn't freed because the old string is used
 * by the undo module.
 *
 * \return The old name.
 */
void *
ChangeObjectName (int Type, void *Ptr1, void *Ptr2, void *Ptr3, char *Name)
{
  void *result;
  /* setup identifier */
  NewName = Name;
  result = ObjectOperation (&ChangeNameFunctions, Type, Ptr1, Ptr2, Ptr3);
  Draw ();
  return (result);
}

/*!
 * \brief Changes the clearance-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObjectJoin (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&ChangeJoinFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Sets the clearance-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
SetObjectJoin (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&SetJoinFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Clears the clearance-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ClrObjectJoin (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&ClrJoinFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Changes the square-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObjectSquare (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&ChangeSquareFunctions, Type, Ptr1, Ptr2, Ptr3) !=
      NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Sets the square-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
SetObjectSquare (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&SetSquareFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Clears the square-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ClrObjectSquare (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&ClrSquareFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Changes the octagon-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ChangeObjectOctagon (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&ChangeOctagonFunctions, Type, Ptr1, Ptr2, Ptr3) !=
      NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Sets the octagon-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
SetObjectOctagon (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&SetOctagonFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \brief Clears the octagon-flag of the passed object.
 *
 * \return True if anything is changed.
 */
bool
ClrObjectOctagon (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  if (ObjectOperation (&ClrOctagonFunctions, Type, Ptr1, Ptr2, Ptr3) != NULL)
    {
      Draw ();
      IncrementUndoSerialNumber ();
      return (true);
    }
  return (false);
}

/*!
 * \bief Queries the user for a new object name and changes it.
 *
 * \warning The allocated memory isn't freed because the old string is used
 * by the undo module.
 */
void *
QueryInputAndChangeObjectName (int Type, void *Ptr1, void *Ptr2, void *Ptr3)
{
  char *name = NULL;
  char msg[513];

  /* if passed an element name, make it an element reference instead */
  if (Type == ELEMENTNAME_TYPE)
    {
      Type = ELEMENT_TYPE;
      Ptr2 = Ptr1;
      Ptr3 = Ptr1;
    }
  switch (Type)
    {
    case LINE_TYPE:
      name = gui->prompt_for (_("Linename:"),
			      EMPTY (((LineType *) Ptr2)->Number));
      break;

    case VIA_TYPE:
      name = gui->prompt_for (_("Vianame:"),
			      EMPTY (((PinType *) Ptr2)->Name));
      break;

    case PIN_TYPE:
      sprintf (msg, _("%s Pin Name:"), EMPTY (((PinType *) Ptr2)->Number));
      name = gui->prompt_for (msg, EMPTY (((PinType *) Ptr2)->Name));
      break;

    case PAD_TYPE:
      sprintf (msg, _("%s Pad Name:"), EMPTY (((PadType *) Ptr2)->Number));
      name = gui->prompt_for (msg, EMPTY (((PadType *) Ptr2)->Name));
      break;

    case TEXT_TYPE:
      name = gui->prompt_for (_("Enter text:"),
			      EMPTY (((TextType *) Ptr2)->TextString));
      break;

    case ELEMENT_TYPE:
      name = gui->prompt_for (_("Elementname:"),
			      EMPTY (ELEMENT_NAME
				     (PCB, (ElementType *) Ptr2)));
      break;
    }
  if (name)
    {
      /* NB: ChangeObjectName takes ownership of the passed memory */
      char *old = (char *)ChangeObjectName (Type, Ptr1, Ptr2, Ptr3, name);
      if (old != (char *) -1)
	{
	  AddObjectToChangeNameUndoList (Type, Ptr1, Ptr2, Ptr3, old);
	  IncrementUndoSerialNumber ();
	}
      Draw ();
      return (Ptr3);
    }
  return (NULL);
}

/*!
 * \brief Changes the maximum size of a layout, adjusts the scrollbars,
 * releases the saved pixmap if necessary and adjusts the cursor
 * confinement box.
 */
void
ChangePCBSize (Coord Width, Coord Height)
{
  PCB->MaxWidth = Width;
  PCB->MaxHeight = Height;
  hid_action ("PCBChanged");
}

/*!
 * \brief Changes the mask size of a pad.
 *
 * \return TRUE if changed.
 */
static void *
ChangePadMaskSize (ElementType *Element, PadType *Pad)
{
  Coord new_value = (Absolute) ? Value : Pad->Mask + Value;

  new_value = MAX (new_value, 0);
  if (new_value == Pad->Mask && Absolute == 0)
    new_value = Pad->Thickness;
  if (new_value != Pad->Mask)
    {
      AddObjectToMaskSizeUndoList (PAD_TYPE, Element, Pad, Pad);
      ErasePad (Pad);
      r_delete_entry (PCB->Data->pad_tree, &Pad->BoundingBox);
      Pad->Mask = new_value;
      SetElementBoundingBox (PCB->Data, Element, &PCB->Font);
      DrawPad (Pad);
      return (Pad);
    }
  return (NULL);
}

/*!
 * \brief Changes the mask size of a pin.
 *
 * \return TRUE if changed.
 */
static void *
ChangePinMaskSize (ElementType *Element, PinType *Pin)
{
  Coord new_value = (Absolute) ? Value : Pin->Mask + Value;

  new_value = MAX (new_value, 0);
  if (new_value == Pin->Mask && Absolute == 0)
    new_value = Pin->Thickness;
  if (new_value != Pin->Mask)
    {
      AddObjectToMaskSizeUndoList (PIN_TYPE, Element, Pin, Pin);
      ErasePin (Pin);
      r_delete_entry (PCB->Data->pin_tree, &Pin->BoundingBox);
      Pin->Mask = new_value;
      SetElementBoundingBox (PCB->Data, Element, &PCB->Font);
      DrawPin (Pin);
      return (Pin);
    }
  return (NULL);
}

/*!
 * \brief Changes the mask size of a via.
 *
 * \return TRUE if changed.
 */
static void *
ChangeViaMaskSize (PinType *Via)
{
  Coord new_value;

  new_value = (Absolute) ? Value : Via->Mask + Value;
  new_value = MAX (new_value, 0);
  if (new_value != Via->Mask)
    {
      AddObjectToMaskSizeUndoList (VIA_TYPE, Via, Via, Via);
      EraseVia (Via);
      r_delete_entry (PCB->Data->via_tree, &Via->BoundingBox);
      Via->Mask = new_value;
      SetPinBoundingBox (Via);
      r_insert_entry (PCB->Data->via_tree, &Via->BoundingBox, 0);
      DrawVia (Via);
      return (Via);
    }
  return (NULL);
}