1 // 2 // "$Id: unittest_text.cxx 7913 2010-11-29 18:18:27Z greg.ercolano $" 3 // 4 // Unit tests for the Fast Light Tool Kit (FLTK). 5 // 6 // Copyright 1998-2010 by Bill Spitzak and others. 7 // 8 // This library is free software; you can redistribute it and/or 9 // modify it under the terms of the GNU Library General Public 10 // License as published by the Free Software Foundation; either 11 // version 2 of the License, or (at your option) any later version. 12 // 13 // This library is distributed in the hope that it will be useful, 14 // but WITHOUT ANY WARRANTY; without even the implied warranty of 15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 // Library General Public License for more details. 17 // 18 // You should have received a copy of the GNU Library General Public 19 // License along with this library; if not, write to the Free Software 20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 21 // USA. 22 // 23 // Please report all bugs and problems on the following page: 24 // 25 // http://www.fltk.org/str.php 26 // 27 28 #include <FL/Fl_Box.H> 29 #include <FL/fl_draw.H> 30 31 // 32 // --- fl_text_extents() tests ----------------------------------------------- 33 // 34 class TextExtentsTest : public Fl_Widget 35 { DrawTextAndBoxes(const char * txt,int X,int Y)36 void DrawTextAndBoxes(const char *txt, int X, int Y) { 37 int wo = 0, ho = 0; 38 int dx, dy; 39 // First, we draw the bounding boxes (fl_measure and fl_text_extents) 40 // draw fl_measure() typographical bounding box 41 fl_measure(txt, wo, ho, 0); 42 int desc = fl_descent(); 43 fl_color(FL_RED); 44 fl_rect(X, Y-ho+desc, wo, ho); 45 // draw fl_text_extents() glyph bounding box 46 fl_text_extents(txt, dx, dy, wo, ho); 47 fl_color(FL_GREEN); 48 fl_rect(X+dx, Y+dy, wo, ho); 49 // Then we draw the text to show how it fits insode each of the two boxes 50 fl_color(FL_BLACK); 51 fl_draw(txt, X, Y); 52 } 53 public: create()54 static Fl_Widget *create() { 55 return new TextExtentsTest(TESTAREA_X, TESTAREA_Y, TESTAREA_W, TESTAREA_H); 56 } TextExtentsTest(int x,int y,int w,int h)57 TextExtentsTest(int x, int y, int w, int h) : Fl_Widget(x, y, w, h) {} draw(void)58 void draw(void) { 59 int x0 = x(); // origin is current window position for Fl_Box 60 int y0 = y(); 61 int w0 = w(); 62 int h0 = h(); 63 fl_push_clip(x0, y0, w0, h0); // reset local clipping 64 { 65 // set the background colour - slightly off-white to enhance the green bounding box 66 fl_color(fl_gray_ramp(FL_NUM_GRAY - 3)); 67 fl_rectf(x0, y0, w0, h0); 68 69 fl_font(FL_HELVETICA, 30); 70 int xx = x0+55; 71 int yy = y0+40; 72 DrawTextAndBoxes("!abcdeABCDE\"#A", xx, yy); yy += 50; // mixed string 73 DrawTextAndBoxes("oacs", xx, yy); xx += 100; // small glyphs 74 DrawTextAndBoxes("qjgIPT", xx, yy); yy += 50; xx -= 100; // glyphs with descenders 75 DrawTextAndBoxes("````````", xx, yy); yy += 50; // high small glyphs 76 DrawTextAndBoxes("--------", xx, yy); yy += 50; // mid small glyphs 77 DrawTextAndBoxes("________", xx, yy); yy += 50; // low small glyphs 78 79 fl_font(FL_HELVETICA, 14); 80 fl_color(FL_RED); fl_draw("fl_measure bounding box in RED", xx, yy); yy += 20; 81 fl_color(FL_GREEN); fl_draw("fl_text_extents bounding box in GREEN", xx, yy); 82 fl_color(FL_BLACK); 83 xx = x0 + 10; yy += 30; 84 fl_draw("NOTE: On systems with text anti-aliasing (e.g. OSX Quartz)", xx, yy); 85 w0 = h0 = 0; fl_measure("NOTE: ", w0, h0, 0); 86 xx += w0; yy += h0; 87 fl_draw("text may leak slightly outside the fl_text_extents()", xx, yy); 88 } 89 fl_pop_clip(); // remove the local clip 90 } 91 }; 92 93 UnitTest textExtents("rendering text", TextExtentsTest::create); 94 95 // 96 // End of "$Id: unittest_text.cxx 7913 2010-11-29 18:18:27Z greg.ercolano $" 97 // 98