Qt-文本绘制

drawtext.h

#ifndef _DRAWTEXT_H_
#define _DRAWTEXT_H_

#include <QWidget>
#include <QPixmap>


class DrawText : public QWidget
{
 public:
    DrawText( QWidget * = 0 );


 protected:
    void paintEvent( QPaintEvent * );
    
 private:
    int randomInt( int );
    int randomInt( int , int );
    
    QPixmap pixmap;
};
#endif 

drawtext.cpp

#include "drawtext.h"
#include <QtGui>
#include <cstdlib>

DrawText::DrawText( QWidget *parent )
    :QWidget( parent )
{
    const int WIDTH = 800;
    const int HEIGHT = 600;
    const int MAX_FONT_SIZE = WIDTH / 4;
    const int MIN_FONT_SIZE = WIDTH / 40;
    
    pixmap = QPixmap( QSize( WIDTH, HEIGHT ) );
    pixmap.fill( Qt::white );
    
    QPainter painter( &pixmap );
    painter.setRenderHint( QPainter::Antialiasing );

    sran