demo.gif非常感谢navca的分享。该例子基于QGraphicsItem绘图实现的挖掘机。(文末源码地址)
心中有坐标,万物皆可绘
我的挖掘机例子共分为车体,大臂,小臂,爪子四部分,全部皆为自绘。
- 车体
void Body::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->setBrush(QBrush(Qt::darkYellow));
painter->drawRect(0,0,220,100);
painter->drawRect(100,-80,100,80);
painter->setBrush(QBrush(Qt::darkYellow));
painter->drawEllipse(_pinPoint1, 5,5);
painter->drawEllipse(_pinPoint2, 5,5);
painter->setPen(QPen(QBrush(Qt::gray), 6));
QPointF p(mapFromItem(_bigHand, _bigHand->PinPoint));
painter->drawLine(_pinPoint2.x(), _pinPoint2.y(), p.x(), p.y());
//液压臂
painter->setPen(QPen(QBrush(Qt::black), 10));
QLineF line(_pinPoint2, p);
qreal angle = line.angle();
QPointF midPoint(_pinPoint2.x()+ 80*cos(qDegreesToRadians(angle)), _pinPoint2.y() - 80*sin(qDegreesToRadians(angle)));
painter->drawLine(_pinPoint2, midPoint);
}
- 大臂
void BigHand::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->setPen(Qt::black);
painter->setBrush(Qt::yellow);
QPainterPath path;
path.moveTo(-6,2);
path.lineTo(60,-180);
path.lineTo(250,-270);
path.lineTo(258,-260);
path.lineTo(90,-150);
path.lineTo(5,5);
path.moveTo(_pinPoint2.x()-10, _pinPoint2.y()+5);
path.lineTo(_pinPoint2.x()-5, _pinPoint2.y()-8);
path.lineTo(_pinPoint2.x()+8, _pinPoint2.y()-5);
path.lineTo(_pinPoint2.x()-10, _pinPoint2.y()+5);
painter->drawPath(path);
painter->setBrush(Qt::darkYellow);
painter->drawEllipse(-4,-5,10,10);
painter->drawEllipse(PinPoint,5,5);
painter->drawEllipse(_pinPoint1,5,5);
painter->drawEllipse(_pinPoint2,5,5);
painter->setPen(QPen(QBrush(Qt::gray), 6));
QPointF p(mapFromItem(_smallHand, _smallHand->PinPoint));
painter->drawLine(_pinPoint2.x(), _pinPoint2.y(), p.x(), p.y());
//液压臂
painter->setPen(QPen(QBrush(Qt::black), 10));
QLineF line(_pinPoint2, p);
qreal angle = line.angle();
QPointF midPoint(_pinPoint2.x()+ 110*cos(qDegreesToRadians(angle)), _pinPoint2.y() - 110*sin(qDegreesToRadians(angle)));
painter->drawLine(_pinPoint2, midPoint);
}
- 小臂
void SmallHand::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->setPen(Qt::black);
painter->setBrush(Qt::yellow);
QPainterPath path;
path.moveTo(-50, -30);
path.lineTo(200, 0);
path.lineTo(198, 10);
path.lineTo(-3, 5);
path.lineTo(-55, -18);
path.lineTo(-50, -30);
path.moveTo(_pinPoint1.x()-10, _pinPoint1.y()+5);
path.lineTo(_pinPoint1.x(), _pinPoint1.y()-6);
path.lineTo(_pinPoint1.x()+10, _pinPoint1.y()+7);
path.lineTo(_pinPoint1.x()-8, _pinPoint1.y()+5);
painter->drawPath(path);
painter->setBrush(Qt::darkYellow);
painter->drawEllipse(-5,-5, 10, 10);
painter->drawEllipse(PinPoint,5,5);
painter->drawEllipse(_pinPoint1,5,5);
painter->drawEllipse(_pinPoint2,5,5);
painter->drawEllipse(_pinPoint3,5,5);
painter->setPen(QPen(QBrush(Qt::gray), 6));
QPointF p(mapFromItem(_littleHand, _littleHand->PinPoint));
painter->drawLine(_pinPoint1.x(), _pinPoint1.y(), p.x(), p.y());
painter->setPen(QPen(QBrush(Qt::black), 10));
QLineF line(_pinPoint1, p);
qreal angle = line.angle();
QPointF midPoint(_pinPoint1.x()+ 90*cos(qDegreesToRadians(angle)), _pinPoint1.y() - 90*sin(qDegreesToRadians(angle)));
painter->drawLine(_pinPoint1, midPoint);
painter->setPen(QPen(QBrush(Qt::black), 10));
QPointF p1(mapFromItem(_hand, _hand->PinPoint));
painter->drawLine(p.x(), p.y(), p1.x(), p1.y());
}
- 爪子
void Hand::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->setPen(Qt::black);
painter->setBrush(Qt::yellow);
QPainterPath path;
path.moveTo(-12, -30);
path.lineTo(-3, -35);
path.lineTo(-6, -44);
path.lineTo(6, -48);
path.lineTo(35, -45);
path.lineTo(70, 0);
path.lineTo(15, -10);
path.lineTo(10, 0);
path.lineTo(3, 7);
path.lineTo(-3, 3);
path.lineTo(-12, -30);
painter->drawPath(path);
painter->setBrush(Qt::darkYellow);
painter->drawEllipse(PinPoint,5,5);
painter->drawEllipse(_pinPoint1,5,5);
}
main_page.png
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