?? form.cpp
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#include <QMouseEvent>#include <QPainter>#include <QtDebug>#include "form.h"Form::Form(QWidget * parent) : QWidget(parent){ setAttribute(Qt::WA_NoBackground); bDrawing = false; curShape = Ellipse; resize(800,600); bufferImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied); bufferImage.fill(qRgb(255, 255, 255)); tempImage = QImage(width(), height(), QImage::Format_ARGB32_Premultiplied);}void Form::setShape(ShapeType shape){ curShape = shape;}void Form::mousePressEvent( QMouseEvent * event ){ bDrawing = true; x = event->x(); y = event->y();}void Form::mouseMoveEvent(QMouseEvent *event){ w = event->x() - x; h = event->y() - y; tempImage = bufferImage; paint(tempImage);}void Form::mouseReleaseEvent(QMouseEvent *event){ bDrawing = false; paint(bufferImage);}void Form::paintEvent(QPaintEvent *event){ QPainter painter(this); if(bDrawing) painter.drawImage(QPoint(0, 0), tempImage); else painter.drawImage(QPoint(0, 0), bufferImage);}void Form::fontChanged(const QFont& font){ textFont = font;}void Form::paint(QImage& image){ QPainter painter(&image); painter.setPen(curPen); painter.setBrush(curBrush); switch(curShape) { case Rectangle: painter.drawRect(x, y, w, h); break; case Ellipse: painter.drawEllipse(x, y, w, h); break; case Text: QFontMetrics metrics(textFont); QRect rect = metrics.boundingRect(textFont.family()); painter.setFont(textFont); painter.translate(x, y); painter.scale(w/rect.width(), h/rect.height()); // 因為文字從下面對齊 painter.drawText(0, rect.height(), textFont.family()); break; } update();}void Form::penChanged(QPen& pen){ curPen = pen;}void Form::brushChanged(QBrush& brush){ curBrush = brush;}?? 快捷鍵說明
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