QT和QPainter划清了界限。这条线可以用鼠标拖动吗?这个功能能实现吗?如果有,如何实现?
可以用mouseMoveEvent或者timer刷新鼠标坐标,然后重画。下面是计时器方法:
Draw::Draw(q widget * parent):q widget(parent)
{
m _ timer = new q timer(this);
connect(m_timer,SIGNAL(timeout()),this,SLOT(update SLOT()));
m _ timer-& gt;开始(10);
}
void Draw::updateSlot()
{
q point pos = mapFromGlobal(q cursor::pos());
m _ startX = pos . x();
m _ startY = pos . y();
update();
}
void Draw::paint event(QPaintEvent * event)
{
QPainter画师(这个);
painter.drawLine(m_startX,m_startY,m_startX+20,m _ startY+10);
}