?? paintarea.cpp
字號:
#include "paintarea.h"
PaintArea::PaintArea(QWidget *parent)
{
QPalette p = palette();
p.setColor(QPalette::Window,Qt::white);
setPalette(p);
setAutoFillBackground(true);
setMinimumSize(400,400);
}
void PaintArea::setShape(Shape s)
{
shape = s;
update();
}
void PaintArea::setPen(QPen p)
{
pen = p;
update();
}
void PaintArea::setBrush(QBrush b)
{
brush = b;
update();
}
void PaintArea::paintEvent(QPaintEvent *)
{
QPainter p(this);
p.setPen(pen);
p.setBrush(brush);
QRect rect(50,100,300,200);
static const QPoint points[4] = {
QPoint(150, 100),
QPoint(300, 150),
QPoint(350, 250),
QPoint(100, 300)
};
int startAngle = 30 * 16;
int spanAngle = 120 * 16;
QPainterPath path;
path.addRect(150,150,100,100);
path.moveTo(100,100);
path.cubicTo(300,100,200,200,300,300);
path.cubicTo(100,300,200,200,100,100);
switch(shape)
{
case Line:
p.drawLine(rect.topLeft(),rect.bottomRight());
break;
case Rectangle:
p.drawRect(rect);
break;
case RoundRect:
p.drawRoundRect(rect);
break;
case Ellipse:
p.drawEllipse(rect);
break;
case Polygon:
p.drawPolygon(points,4);
break;
case Polyline:
p.drawPolyline(points,4);
break;
case Points:
p.drawPoints(points,4);
break;
case Arc:
p.drawArc(rect,startAngle,spanAngle);
break;
case Path:
p.drawPath(path);
break;
case Text:
p.drawText(rect,Qt::AlignCenter,tr("Hello Qt!"));
break;
case Pixmap:
p.drawPixmap(150,150,QPixmap(":/images/butterfly.png"));
break;
default:
break;
}
}
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