Window proc processing updates

[wxWidgets.git] / demos / forty / game.cpp

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

#ifdef __GNUG__
#pragma implementation
#pragma interface
#endif

// 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;
}


// 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("Game::DoMove() src == dest", "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("Game::DoMove() Undo buffer full", "Debug message",
                           wxOK | wxICON_EXCLAMATION);
    }

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


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;

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

    char str[80];
    sprintf(str, "%d", m_currentScore);
    dc.DrawText("Score:", x, y);
    dc.DrawText(str, x + w, y);
    y += h;

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

    sprintf(str, "%d", m_numWins);
    dc.DrawText("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);
        }
    sprintf(str, "%d", average);
    dc.DrawText("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);

    char str[10];
    sprintf(str, "%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("Pack::AddCard() Undo error", "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;
}

Base::~Base()
{
// nothing special at the moment
};


//----------------------------------------------------------------//
// 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;
}

Foundation::~Foundation()
{
// nothing special at the moment
};


//----------------------------------------------------//
// 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;
}


Discard::~Discard()
{
// nothing special at the moment
};