canvascardpile.cpp

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.10平台上编译为嵌入式图形界面操作系统。

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**
** This file is part of the Qtopia Environment.
** 
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** under the terms of the GNU General Public License as published by the
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** option) any later version.
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** LICENSE.GPL.
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** the code of this program with Qtopia applications copyrighted, developed
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#include <qpainter.h>
#include "cardmetrics.h"
#include "canvascardpile.h"
#include "canvasitemtimer.h"


void AnimatedCanvasCardPile::addCards( CanvasCard *card )
{
    reset();
    setPos(card->pos());
    savePos();

    int depth = 0;

    // Count the cards under the first card
    CanvasCard *tmpCard = card;
    while (tmpCard) {
	tmpCard->hide();
	tmpCard = (CanvasCard *)tmpCard->cardPile()->cardInfront(tmpCard);
	depth++;
    }

    firstCard = card;
    int height = CardMetrics::height() + (depth - 1) * CardMetrics::offsetDown();
    int width  = CardMetrics::width();

    setSize( width, height );

    QImage blank(width,height,32);
    blank.setAlphaBuffer(TRUE);
    for ( int i = 0; i < height; i++ ) {
	QRgb *linePtr = (QRgb*)blank.scanLine( i );
	for ( int j = 0; j < width; j++ ) {
	    linePtr[j]=qRgba(0,0,0,1);
	}
    }
    pile->convertFromImage(blank);

    {
	QPainter p( pile );
	p.translate( -card->x(), -card->y() );

	while (card) {
	    card->draw( p );
	    card = (CanvasCard *)card->cardPile()->cardInfront(card);
	}
    }

    doubleBuffer = pile->convertToImage().convertDepth( 32 );

    if ( doubleBuffer.depth() == 32 ) { // 32-bit depth support, we can do alpha effects
	doubleBuffer.setAlphaBuffer( TRUE );
	for ( int i = 0; i < height; i++ ) {
	    QRgb *linePtr = (QRgb*)doubleBuffer.scanLine( i );
	    int alpha = 255 - i * 220 / height;
	    for ( int j = 0; j < width; j++ ) {
		const QRgb p = linePtr[j];
		if ( qAlpha(p) > alpha )
		    linePtr[j] = qRgba(qRed(p),qGreen(p),qBlue(p),alpha);
	    }
	}
    }
}


void AnimatedCanvasCardPile::updatePosition( double percent )
{
    double percentLeft = 1.0 - percent;
    double x = dest.x() - percentLeft * delta.x();
    double y = dest.y() - percentLeft * delta.y();

    if ( percent == 1.0 ) {
	CanvasCard *item = firstCard;
	while (item) {
	    item->show();
	    item = (CanvasCard *)item->cardPile()->cardInfront(item);
	}
	hide();
	move( x, y );
    } else {
	move( x, y );
	hide();
	show();
    }
}


void AnimatedCanvasCardPile::animatedMove( QPoint p, int msecs )
{
    dest = p;
    delta = p - pos();
    start(msecs);
}


void AnimatedCanvasCardPile::draw( QPainter& p )
{
    p.drawImage( pos(), doubleBuffer );
}