qt qpainter 画鼠标轨迹[转]

mclovein

#include
#include
#include
#include
#include
#include
const int MAXPOINTS = 2000;
const int MAXCOLORS = 40;
class ConnectWidget:public QWidget
{
  public:
    ConnectWidget(QWidget *parent = 0, const char *name= 0);
    ~ConnectWidget();
  protected:
    void paintEvent(QPaintEvent *);
    void mousePressEvent(QMouseEvent *);
    void mouseReleaseEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
  private:
    QPoint *points;
    QColor *colors;
    int count;
    bool down;
};
ConnectWidget::ConnectWidget(QWidget *parent, const char *name)
:QWidget(parent,name)  
{
  setBackgroundColor(white); //还可以设置背景色
  count = 0;
  down = FALSE;
  points = new QPoint[MAXPOINTS];
  colors = new QColor[MAXCOLORS];
  for (int i = 0 ; ipos();
    paint.drawPoint(e->pos());
  }
}
int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  ConnectWidget connect;
//  a.setMainWidget(&connect); //不要这个句子也可以运行
  connect.show();
  return a.exec();
}



本文来自ChinaUnix博客，如果查看原文请点：http://blog.chinaunix.net/u3/93291/showart_2106787.html