demos/forty/game.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        game.cpp
// Purpose:     Forty Thieves patience game
// Author:      Chris Breeze
// Modified by:
// Created:     21/07/97
// Copyright:   (c) 1993-1998 Chris Breeze
// Licence:     wxWindows licence
//---------------------------------------------------------------------------
// Last modified: 22nd July 1998 - ported to wxWidgets 2.0
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include "forty.h"
#include "game.h"

Game::Game(int wins, int games, int score) :
    m_inPlay(false),
    m_moveIndex(0),
    m_redoIndex(0),
    m_bmap(0),
    m_bmapCard(0)
{
    int i;

    m_pack = new Pack(2, 2 + 4 * (CardHeight + 2));
    srand(time(0));

    for (i = 0; i < 5; i++) m_pack->Shuffle();

    m_discard = new Discard(2, 2 + 5 * (CardHeight + 2));

    for (i = 0; i < 8; i++)
    {
        m_foundations[i] = new Foundation(2 + (i / 4) * (CardWidth + 2),
                    2 + (i % 4) * (CardHeight + 2));
    }

    for (i = 0; i < 10; i++)
    {
        m_bases[i] = new Base(8 + (i + 2) * (CardWidth + 2), 2);
    }
    Deal();
    m_srcPile = 0;
    m_liftedCard = 0;

    // copy the input parameters for future reference
    m_numWins = wins;
    m_numGames = games;
    m_totalScore = score;
    m_currentScore = 0;
}


void Game::Layout()
{
    int i;

    m_pack->SetPos(2, 2 + 4 * (CardHeight + 2));

    m_discard->SetPos(2, 2 + 5 * (CardHeight + 2));

    for (i = 0; i < 8; i++)
    {
                m_foundations[i]->SetPos(2 + (i / 4) * (CardWidth + 2),
                                         2 + (i % 4) * (CardHeight + 2));
    }

    for (i = 0; i < 10; i++)
    {
        m_bases[i]->SetPos(8 + (i + 2) * (CardWidth + 2), 2);
    }
    delete m_bmap;
    delete m_bmapCard;
    m_bmap = 0;
    m_bmapCard = 0;
}

// Make sure we delete all objects created by the game object
Game::~Game()
{
    int i;

    delete m_pack;
    delete m_discard;
    for (i = 0; i < 8; i++)
    {
        delete m_foundations[i];
    }
    for (i = 0; i < 10; i++)
    {
        delete m_bases[i];
    }
    delete m_bmap;
    delete m_bmapCard;
}

/*
Set the score for a new player.
NB: call Deal() first if the new player is to start
a new game
*/
void Game::NewPlayer(int wins, int games, int score)
{
    m_numWins = wins;
    m_numGames = games;
    m_totalScore = score;
    m_currentScore = 0;
}

// Undo the last move
void Game::Undo(wxDC& dc)
{
    if (m_moveIndex > 0)
    {
        m_moveIndex--;
        Card* card = m_moves[m_moveIndex].dest->RemoveTopCard(dc);
        m_moves[m_moveIndex].src->AddCard(dc, card);
        DisplayScore(dc);
    }
}

// Redo the last move
void Game::Redo(wxDC& dc)
{
    if (m_moveIndex < m_redoIndex)
    {
        Card* card = m_moves[m_moveIndex].src->RemoveTopCard(dc);
        if (m_moves[m_moveIndex].src == m_pack)
        {
            m_pack->Redraw(dc);
            card->TurnCard(faceup);
        }
        m_moves[m_moveIndex].dest->AddCard(dc, card);
        DisplayScore(dc);
        m_moveIndex++;
    }
}

void Game::DoMove(wxDC& dc, Pile* src, Pile* dest)
{
    if (m_moveIndex < MaxMoves)
    {
        if (src == dest)
        {
            wxMessageBox(wxT("Game::DoMove() src == dest"), wxT("Debug message"),
                   wxOK | wxICON_EXCLAMATION);
        }
        m_moves[m_moveIndex].src = src;
        m_moves[m_moveIndex].dest = dest;
        m_moveIndex++;

        // when we do a move any moves in redo buffer are discarded
        m_redoIndex = m_moveIndex;
    }
    else
    {
        wxMessageBox(wxT("Game::DoMove() Undo buffer full"), wxT("Debug message"),
               wxOK | wxICON_EXCLAMATION);
    }

    if (!m_inPlay)
    {
        m_inPlay = true;
        m_numGames++;
    }
    DisplayScore(dc);

    if (HaveYouWon())
    {
        wxWindow *frame = wxTheApp->GetTopWindow();
        wxWindow *canvas = (wxWindow *) NULL;

        if (frame)
        {
            wxWindowList::compatibility_iterator node = frame->GetChildren().GetFirst();
            if (node) canvas = (wxWindow*)node->GetData();
        }

        // This game is over
        m_inPlay = false;

        // Redraw the score box to update games won
        DisplayScore(dc);

        if (wxMessageBox(wxT("Do you wish to play again?"),
            wxT("Well Done, You have won!"), wxYES_NO | wxICON_QUESTION) == wxYES)
        {
            Deal();
            canvas->Refresh();
        }
        else
        {
            // user cancelled the dialog - exit the app
            ((wxFrame*)canvas->GetParent())->Close(true);
        }
    }
}


void Game::DisplayScore(wxDC& dc)
{
    wxColour bgColour = FortyApp::BackgroundColour();
    wxPen* pen = wxThePenList->FindOrCreatePen(bgColour, 1, wxSOLID);
    dc.SetTextBackground(bgColour);
    dc.SetTextForeground(FortyApp::TextColour());
    dc.SetBrush(FortyApp::BackgroundBrush());
    dc.SetPen(* pen);

    // count the number of cards in foundations
    m_currentScore = 0;
    for (int i = 0; i < 8; i++)
    {
        m_currentScore += m_foundations[i]->GetNumCards();
    }

    int x, y;
    m_pack->GetTopCardPos(x, y);
    x += 12 * CardWidth - 105;

    wxCoord w, h;
    {
        wxCoord width, height;
        dc.GetTextExtent(wxT("Average score:m_x"), &width, &height);
        w = width;
        h = height;
    }
    dc.DrawRectangle(x + w, y, 20, 4 * h);

    wxString str;
    str.Printf(wxT("%d"), m_currentScore);
    dc.DrawText(wxT("Score:"), x, y);
    dc.DrawText(str, x + w, y);
    y += h;

    str.Printf(wxT("%d"), m_numGames);
    dc.DrawText(wxT("Games played:"), x, y);
    dc.DrawText(str, x + w, y);
    y += h;

    str.Printf(wxT("%d"), m_numWins);
    dc.DrawText(wxT("Games won:"), x, y);
    dc.DrawText(str, x + w, y);
    y += h;

    int average = 0;
    if (m_numGames > 0)
    {
        average = (2 * (m_currentScore + m_totalScore) + m_numGames ) / (2 * m_numGames);
    }
    str.Printf(wxT("%d"), average);
    dc.DrawText(wxT("Average score:"), x, y);
    dc.DrawText(str, x + w, y);
}


// Shuffle the m_pack and deal the cards
void Game::Deal()
{
    int i, j;
    Card* card;

    // Reset all the piles, the undo buffer and shuffle the m_pack
    m_moveIndex = 0;
    m_pack->ResetPile();
    for (i = 0; i < 5; i++)
    {
        m_pack->Shuffle();
    }
    m_discard->ResetPile();
    for (i = 0; i < 10; i++)
    {
        m_bases[i]->ResetPile();
    }
    for (i = 0; i <  8; i++)
    {
        m_foundations[i]->ResetPile();
    }

    // Deal the initial 40 cards onto the bases
    for (i = 0; i < 10; i++)
    {
        for (j = 1; j <= 4; j++)
        {
            card = m_pack->RemoveTopCard();
            card->TurnCard(faceup);
            m_bases[i]->AddCard(card);
        }
    }

    if (m_inPlay)
    {
        // player has started the game and then redealt
        // and so we must add the score for this game to the total score
        m_totalScore += m_currentScore;
    }
    m_currentScore = 0;
    m_inPlay = false;
}


// Redraw the m_pack, discard pile, the bases and the foundations
void Game::Redraw(wxDC& dc)
{
    int i;
    m_pack->Redraw(dc);
    m_discard->Redraw(dc);
    for (i = 0; i < 8; i++)
    {
        m_foundations[i]->Redraw(dc);
    }
    for (i = 0; i < 10; i++)
    {
        m_bases[i]->Redraw(dc);
    }
    DisplayScore(dc);

    if (m_bmap == 0)
    {
        m_bmap = new wxBitmap(CardWidth, CardHeight);
        m_bmapCard = new wxBitmap(CardWidth, CardHeight);

        // Initialise the card bitmap to the background colour
        wxMemoryDC memoryDC;
        memoryDC.SelectObject(*m_bmapCard);
        memoryDC.SetPen( *wxTRANSPARENT_PEN );
        memoryDC.SetBrush(FortyApp::BackgroundBrush());
        memoryDC.DrawRectangle(0, 0, CardWidth, CardHeight);
        memoryDC.SelectObject(*m_bmap);
        memoryDC.DrawRectangle(0, 0, CardWidth, CardHeight);
        memoryDC.SelectObject(wxNullBitmap);
    }
}


// Test to see if the point (x, y) is over the top card of one of the piles
// Returns pointer to the pile, or 0 if (x, y) is not over a pile
// or the pile is empty
Pile* Game::WhichPile(int x, int y)
{
    if (m_pack->GetCard(x, y) &&
        m_pack->GetCard(x, y) == m_pack->GetTopCard())
    {
        return m_pack;
    }

    if (m_discard->GetCard(x, y) &&
        m_discard->GetCard(x, y) == m_discard->GetTopCard())
    {
        return m_discard;
    }

    int i;
    for (i = 0; i < 8; i++)
    {
        if (m_foundations[i]->GetCard(x, y) &&
            m_foundations[i]->GetCard(x, y) == m_foundations[i]->GetTopCard())
        {
            return m_foundations[i];
        }
    }

    for (i = 0; i < 10; i++)
    {
        if (m_bases[i]->GetCard(x, y) &&
            m_bases[i]->GetCard(x, y) == m_bases[i]->GetTopCard())
        {
            return m_bases[i];
        }
    }
    return 0;
}


// Left button is pressed - if cursor is over the m_pack then deal a card
// otherwise if it is over a card pick it up ready to be dragged - see MouseMove()
bool Game::LButtonDown(wxDC& dc, int x, int y)
{
    m_srcPile = WhichPile(x, y);
    if (m_srcPile == m_pack)
    {
        Card* card = m_pack->RemoveTopCard();
        if (card)
        {
            m_pack->Redraw(dc);
            card->TurnCard(faceup);
            m_discard->AddCard(dc, card);
            DoMove(dc, m_pack, m_discard);
        }
        m_srcPile = 0;
    }
    else if (m_srcPile)
    {
        m_srcPile->GetTopCardPos(m_xPos, m_yPos);
        m_xOffset = m_xPos - x;
        m_yOffset = m_yPos - y;

        // Copy the area under the card
        // Initialise the card bitmap to the background colour
        {
            wxMemoryDC memoryDC;
            memoryDC.SelectObject(*m_bmap);
            m_liftedCard = m_srcPile->RemoveTopCard(memoryDC, m_xPos, m_yPos);
        }

        // Draw the card in card bitmap ready for blitting onto
        // the screen
        {
            wxMemoryDC memoryDC;
            memoryDC.SelectObject(*m_bmapCard);
            m_liftedCard->Draw(memoryDC, 0, 0);
        }
    }
    return m_srcPile != 0;
}

// Called when the left button is double clicked
// If a card is under the pointer and it can move elsewhere then move it.
// Move onto a foundation as first choice, a populated base as second and
// an empty base as third choice.
// NB Cards in the m_pack cannot be moved in this way - they aren't in play
// yet
void Game::LButtonDblClk(wxDC& dc, int x, int y)
{
    Pile* pile = WhichPile(x, y);
    if (!pile) return;

    // Double click on m_pack is the same as left button down
    if (pile == m_pack)
    {
        LButtonDown(dc, x, y);
    }
    else
    {
        Card* card = pile->GetTopCard();

        if (card)
        {
            int i;

            // if the card is an ace then try to place it next
            // to an ace of the same suit
            if (card->GetPipValue() == 1)
            {
                for(i = 0; i < 4; i++)
                {
                    Card* m_topCard = m_foundations[i]->GetTopCard();
                    if ( m_topCard )
                    {
                        if (m_topCard->GetSuit() == card->GetSuit() &&
                            m_foundations[i + 4] != pile &&
                            m_foundations[i + 4]->GetTopCard() == 0)
                        {
                            pile->RemoveTopCard(dc);
                            m_foundations[i + 4]->AddCard(dc, card);
                            DoMove(dc, pile, m_foundations[i + 4]);
                            return;
                        }
                    }
                }
            }

            // try to place the card on a foundation
            for(i = 0; i < 8; i++)
            {
                if (m_foundations[i]->AcceptCard(card) && m_foundations[i] != pile)
                {
                    pile->RemoveTopCard(dc);
                    m_foundations[i]->AddCard(dc, card);
                    DoMove(dc, pile, m_foundations[i]);
                    return;
                }
            }
            // try to place the card on a populated base
            for(i = 0; i < 10; i++)
            {
                if (m_bases[i]->AcceptCard(card) &&
                    m_bases[i] != pile &&
                    m_bases[i]->GetTopCard())
                {
                    pile->RemoveTopCard(dc);
                    m_bases[i]->AddCard(dc, card);
                    DoMove(dc, pile, m_bases[i]);
                    return;
                }
            }
            // try to place the card on any base
            for(i = 0; i < 10; i++)
            {
                if (m_bases[i]->AcceptCard(card) && m_bases[i] != pile)
                {
                    pile->RemoveTopCard(dc);
                    m_bases[i]->AddCard(dc, card);
                    DoMove(dc, pile, m_bases[i]);
                    return;
                }
            }
        }
    }
}


// Test to see whether the game has been won:
// i.e. m_pack, discard and bases are empty
bool Game::HaveYouWon()
{
    if (m_pack->GetTopCard()) return false;
    if (m_discard->GetTopCard()) return false;
    for(int i = 0; i < 10; i++)
    {
        if (m_bases[i]->GetTopCard()) return false;
    }
    m_numWins++;
    m_totalScore += m_currentScore;
    m_currentScore = 0;
    return true;
}


// See whether the card under the cursor can be moved somewhere else
// Returns 'true' if it can be moved, 'false' otherwise
bool Game::CanYouGo(int x, int y)
{
    Pile* pile = WhichPile(x, y);
    if (pile && pile != m_pack)
    {
        Card* card = pile->GetTopCard();

        if (card)
        {
            int i;
            for(i = 0; i < 8; i++)
            {
                if (m_foundations[i]->AcceptCard(card) && m_foundations[i] != pile)
                {
                    return true;
                }
            }
            for(i = 0; i < 10; i++)
            {
                if (m_bases[i]->GetTopCard() &&
                    m_bases[i]->AcceptCard(card) &&
                    m_bases[i] != pile)
                {
                    return true;
                }
            }
        }
    }
    return false;
}


// Called when the left button is released after dragging a card
// Scan the piles to see if this card overlaps a pile and can be added
// to the pile. If the card overlaps more than one pile on which it can be placed
// then put it on the nearest pile.
void Game::LButtonUp(wxDC& dc, int x, int y)
{
    if (m_srcPile)
    {
        // work out the position of the dragged card
        x += m_xOffset;
        y += m_yOffset;

        Pile* nearestPile = 0;
        int distance = (CardHeight + CardWidth) * (CardHeight + CardWidth);

        // find the nearest pile which will accept the card
        int i;
        for (i = 0; i < 8; i++)
        {
            if (DropCard(x, y, m_foundations[i], m_liftedCard))
            {
                if (m_foundations[i]->CalcDistance(x, y) < distance)
                {
                    nearestPile = m_foundations[i];
                    distance = nearestPile->CalcDistance(x, y);
                }
            }
        }
        for (i = 0; i < 10; i++)
        {
            if (DropCard(x, y, m_bases[i], m_liftedCard))
            {
                if (m_bases[i]->CalcDistance(x, y) < distance)
                {
                    nearestPile = m_bases[i];
                    distance = nearestPile->CalcDistance(x, y);
                }
            }
        }

        // Restore the area under the card
        wxMemoryDC memoryDC;
        memoryDC.SelectObject(*m_bmap);
        dc.Blit(m_xPos, m_yPos, CardWidth, CardHeight,
               &memoryDC, 0, 0, wxCOPY);

        // Draw the card in its new position
        if (nearestPile)
        {
            // Add to new pile
            nearestPile->AddCard(dc, m_liftedCard);
            if (nearestPile != m_srcPile)
            {
                DoMove(dc, m_srcPile, nearestPile);
            }
        }
        else
        {
            // Return card to src pile
            m_srcPile->AddCard(dc, m_liftedCard);
        }
        m_srcPile = 0;
        m_liftedCard = 0;
    }
}


bool Game::DropCard(int x, int y, Pile* pile, Card* card)
{
    bool retval = false;
    if (pile->Overlap(x, y))
    {
        if (pile->AcceptCard(card))
        {
            retval = true;
        }
    }
    return retval;
}


void Game::MouseMove(wxDC& dc, int mx, int my)
{
    if (m_liftedCard)
    {
        wxMemoryDC memoryDC;
        memoryDC.SelectObject(*m_bmap);

        int dx = mx + m_xOffset - m_xPos;
        int dy = my + m_yOffset - m_yPos;

        if (abs(dx) >= CardWidth || abs(dy) >= CardHeight)
        {
            // Restore the area under the card
            dc.Blit(m_xPos, m_yPos, CardWidth, CardHeight,
               &memoryDC, 0, 0, wxCOPY);

            // Copy the area under the card in the new position
            memoryDC.Blit(0, 0, CardWidth, CardHeight,
               &dc, m_xPos + dx, m_yPos + dy, wxCOPY);
        }
        else if (dx >= 0)
        {
            // dx >= 0
            dc.Blit(m_xPos, m_yPos, dx, CardHeight, &memoryDC, 0, 0, wxCOPY);
            if (dy >= 0)
            {
                // dy >= 0
                dc.Blit(m_xPos + dx, m_yPos, CardWidth - dx, dy, &memoryDC, dx, 0, wxCOPY);
                memoryDC.Blit(0, 0, CardWidth - dx, CardHeight - dy,
                       &memoryDC, dx, dy, wxCOPY);
                memoryDC.Blit(0, CardHeight - dy, CardWidth - dx, dy,
                       &dc, m_xPos + dx, m_yPos + CardHeight, wxCOPY);
            }
            else
            {
                // dy < 0
                dc.Blit(m_xPos + dx, m_yPos + dy + CardHeight, CardWidth - dx, -dy,
                       &memoryDC, dx, CardHeight + dy, wxCOPY);
                memoryDC.Blit(0, -dy, CardWidth - dx, CardHeight + dy,
                       &memoryDC, dx, 0, wxCOPY);
                memoryDC.Blit(0, 0, CardWidth - dx, -dy,
                       &dc, m_xPos + dx, m_yPos + dy, wxCOPY);
            }
            memoryDC.Blit(CardWidth - dx, 0, dx, CardHeight,
                   &dc, m_xPos + CardWidth, m_yPos + dy, wxCOPY);
        }
        else
        {
            // dx < 0
            dc.Blit(m_xPos + CardWidth + dx, m_yPos, -dx, CardHeight,
                   &memoryDC, CardWidth + dx, 0, wxCOPY);
            if (dy >= 0)
            {
                dc.Blit(m_xPos, m_yPos, CardWidth + dx, dy, &memoryDC, 0, 0, wxCOPY);
                memoryDC.Blit(-dx, 0, CardWidth + dx, CardHeight - dy,
                       &memoryDC, 0, dy, wxCOPY);
                memoryDC.Blit(-dx, CardHeight - dy, CardWidth + dx, dy,
                       &dc, m_xPos, m_yPos + CardHeight, wxCOPY);
            }
            else
            {
                // dy < 0
                dc.Blit(m_xPos, m_yPos + CardHeight + dy, CardWidth + dx, -dy,
                       &memoryDC, 0, CardHeight + dy, wxCOPY);
                memoryDC.Blit(-dx, -dy, CardWidth + dx, CardHeight + dy,
                       &memoryDC, 0, 0, wxCOPY);
                memoryDC.Blit(-dx, 0, CardWidth + dx, -dy,
                       &dc, m_xPos, m_yPos + dy, wxCOPY);
            }
            memoryDC.Blit(0, 0, -dx, CardHeight,
                   &dc, m_xPos + dx, m_yPos + dy, wxCOPY);
        }
        m_xPos += dx;
        m_yPos += dy;

        // draw the card in its new position
        memoryDC.SelectObject(*m_bmapCard);
        dc.Blit(m_xPos, m_yPos, CardWidth, CardHeight,
               &memoryDC, 0, 0, wxCOPY);
    }
}


//----------------------------------------------//
// The Pack class: holds the two decks of cards //
//----------------------------------------------//
Pack::Pack(int x, int y) : Pile(x, y, 0, 0)
{
    for (m_topCard = 0; m_topCard < NumCards; m_topCard++)
    {
        m_cards[m_topCard] = new Card(1 + m_topCard / 2, facedown);
    }
    m_topCard = NumCards - 1;
}


void Pack::Shuffle()
{
    Card* temp[NumCards];
    int i;

    // Don't try to shuffle an empty m_pack!
    if (m_topCard < 0) return;

    // Copy the cards into a temporary array. Start by clearing
    // the array and then copy the card into a random position.
    // If the position is occupied then find the next lower position.
    for (i = 0; i <= m_topCard; i++)
    {
        temp[i] = 0;
    }
    for (i = 0; i <= m_topCard; i++)
    {
        int pos = rand() % (m_topCard + 1);
        while (temp[pos])
        {
            pos--;
            if (pos < 0) pos = m_topCard;
        }
        m_cards[i]->TurnCard(facedown);
        temp[pos] = m_cards[i];
        m_cards[i] = 0;
    }

    // Copy each card back into the m_pack in a random
    // position. If position is occupied then find nearest
    // unoccupied position after the random position.
    for (i = 0; i <= m_topCard; i++)
    {
        int pos = rand() % (m_topCard + 1);
        while (m_cards[pos])
        {
            pos++;
            if (pos > m_topCard) pos = 0;
        }
        m_cards[pos] = temp[i];
    }
}

void Pack::Redraw(wxDC& dc)
{
    Pile::Redraw(dc);

    wxString str;
    str.Printf(wxT("%d  "), m_topCard + 1);

    dc.SetBackgroundMode( wxSOLID );
    dc.SetTextBackground(FortyApp::BackgroundColour());
    dc.SetTextForeground(FortyApp::TextColour());
    dc.DrawText(str, m_x + CardWidth + 5, m_y + CardHeight / 2);

}

void Pack::AddCard(Card* card)
{
    if (card == m_cards[m_topCard + 1])
    {
        m_topCard++;
    }
    else
    {
        wxMessageBox(wxT("Pack::AddCard() Undo error"), wxT("Forty Thieves: Warning"),
           wxOK | wxICON_EXCLAMATION);
    }
    card->TurnCard(facedown);
}


Pack::~Pack()
{
    for (m_topCard = 0; m_topCard < NumCards; m_topCard++)
    {
        delete m_cards[m_topCard];
    }
}


//------------------------------------------------------//
// The Base class: holds the initial pile of four cards //
//------------------------------------------------------//
Base::Base(int x, int y) : Pile(x, y, 0, 12)
{
    m_topCard = -1;
}


bool Base::AcceptCard(Card* card)
{
    bool retval = false;

    if (m_topCard >= 0)
    {
        if (m_cards[m_topCard]->GetSuit() == card->GetSuit() &&
            m_cards[m_topCard]->GetPipValue() - 1 == card->GetPipValue())
        {
            retval = true;
        }
    }
    else
    {
        // pile is empty - ACCEPT
        retval = true;
    }
    return retval;
}


//----------------------------------------------------------------//
// The Foundation class: holds the cards built up from the ace... //
//----------------------------------------------------------------//
Foundation::Foundation(int x, int y) : Pile(x, y, 0, 0)
{
    m_topCard = -1;
}

bool Foundation::AcceptCard(Card* card)
{
    bool retval = false;

    if (m_topCard >= 0)
    {
        if (m_cards[m_topCard]->GetSuit() == card->GetSuit() &&
            m_cards[m_topCard]->GetPipValue() + 1 == card->GetPipValue())
        {
            retval = true;
        }
    }
    else if (card->GetPipValue() == 1)
    {
        // It's an ace and the pile is empty - ACCEPT
        retval = true;
    }
    return retval;
}


//----------------------------------------------------//
// The Discard class: holds cards dealt from the m_pack //
//----------------------------------------------------//
Discard::Discard(int x, int y) : Pile(x, y, 19, 0)
{
    m_topCard = -1;
}

void Discard::Redraw(wxDC& dc)
{
    if (m_topCard >= 0)
    {
        if (m_dx == 0 && m_dy == 0)
        {
            m_cards[m_topCard]->Draw(dc, m_x, m_y);
        }
        else
        {
            int x = m_x;
            int y = m_y;
            for (int i = 0; i <= m_topCard; i++)
            {
                m_cards[i]->Draw(dc, x, y);
                x += m_dx;
                y += m_dy;
                if (i == 31)
                {
                    x = m_x;
                    y = m_y + CardHeight / 3;
                }
            }
        }
    }
    else
    {
        Card::DrawNullCard(dc, m_x, m_y);
    }
}


void Discard::GetTopCardPos(int& x, int& y)
{
    if (m_topCard < 0)
    {
        x = m_x;
        y = m_y;
    }
    else if (m_topCard > 31)
    {
        x = m_x + m_dx * (m_topCard - 32);
        y = m_y + CardHeight / 3;
    }
    else
    {
        x = m_x + m_dx * m_topCard;
        y = m_y;
    }
}


Card* Discard::RemoveTopCard(wxDC& dc, int m_xOffset, int m_yOffset)
{
    Card* card;

    if (m_topCard <= 31)
    {
        card = Pile::RemoveTopCard(dc, m_xOffset, m_yOffset);
    }
    else
    {
        int topX, topY, x, y;
        GetTopCardPos(topX, topY);
        card = Pile::RemoveTopCard();
        card->Erase(dc, topX - m_xOffset, topY - m_yOffset);
        GetTopCardPos(x, y);
        dc.SetClippingRegion(topX - m_xOffset, topY - m_yOffset,
                     CardWidth, CardHeight);

        for (int i = m_topCard - 31; i <= m_topCard - 31 + CardWidth / m_dx; i++)
        {
            m_cards[i]->Draw(dc, m_x - m_xOffset + i * m_dx, m_y - m_yOffset);
        }
        if (m_topCard > 31)
        {
            m_cards[m_topCard]->Draw(dc, topX - m_xOffset - m_dx, topY - m_yOffset);
        }
        dc.DestroyClippingRegion();
    }

    return card;
}