draw.cpp

Qt绘图 draw draw.cpp draw.o draw.pro Makefile draw.png

#include <qapplication.h>
#include <qwidget.h>
#include <qpainter.h>
#include <qbrush.h>

class DrawDemo:public QWidget
{
public:
	DrawDemo( QWidget *parent=0, const char *name=0 );
	void paintEvent( QPaintEvent *);
private:
	void drawPrimitives( QPainter *p);
};

DrawDemo::DrawDemo( QWidget *parent, const char *name):QWidget(parent, name)
{
	setBackgroundColor(white);
}

void DrawDemo::drawPrimitives(QPainter *p)
{
	QBrush b1( Qt::blue );
	QBrush b2( Qt::green, Qt::Dense6Pattern );
	QBrush b3( Qt::NoBrush );
	QBrush b4( Qt::CrossPattern );

	p->setPen( Qt::red );
	p->setBrush( b1 );
	p->drawRect( 20, 20, 120, 90 );

	p->setBrush( b2 );
	p->drawRoundRect( 180, 20, 120, 90, 20, 20 );

	p->setBrush( b3 );
	p->drawEllipse( 20, 140, 120, 60 );

	p->setBrush( b4 );
	p->drawPie( 180, 140, 120, 120, 45*16, 90*16 );

	p->setBrush( b1 );
	p->drawLine( 20, 220, 300, 220 );
}

void DrawDemo::paintEvent( QPaintEvent *)
{
	QPainter paint(this);
	drawPrimitives(&paint);
}

int main(int argc, char **argv)
{
	QApplication app(argc, argv);
	
	DrawDemo drawdemo;
	drawdemo.resize( 320, 240 );
	drawdemo.setCaption( "QT DRAW DEMO");

	app.setMainWidget(&drawdemo);
	drawdemo.show();

	return app.exec();
}