qt 点击界面使扇形旋转
时间: 2023-10-07 08:11:31 浏览: 119
要实现这个功能,你需要使用 Qt 的绘图功能和动画功能。以下是一个简单的示例代码,用于在点击后旋转扇形:
```cpp
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsItem>
#include <QPropertyAnimation>
#include <QMouseEvent>
#include <QPainterPath>
class PieSlice : public QGraphicsItem
{
public:
PieSlice(qreal startAngle, qreal spanAngle, QGraphicsItem *parent = nullptr)
: QGraphicsItem(parent), startAngle_(startAngle), spanAngle_(spanAngle)
{
}
QRectF boundingRect() const override
{
return QRectF(-50, -50, 100, 100);
}
void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override
{
painter->setRenderHint(QPainter::Antialiasing);
QPainterPath path;
path.moveTo(0, 0);
path.arcTo(-50, -50, 100, 100, startAngle_, spanAngle_);
path.lineTo(0, 0);
painter->fillPath(path, QColor(Qt::red));
painter->drawPath(path);
}
void setStartAngle(qreal startAngle)
{
startAngle_ = startAngle;
update();
}
qreal startAngle() const
{
return startAngle_;
}
void setSpanAngle(qreal spanAngle)
{
spanAngle_ = spanAngle;
update();
}
qreal spanAngle() const
{
return spanAngle_;
}
private:
qreal startAngle_;
qreal spanAngle_;
};
class GraphicsView : public QGraphicsView
{
public:
GraphicsView(QWidget *parent = nullptr)
: QGraphicsView(parent)
{
setRenderHint(QPainter::Antialiasing);
setScene(new QGraphicsScene(this));
setAlignment(Qt::AlignLeft | Qt::AlignTop);
setFixedSize(300, 300);
setWindowTitle("Pie Slice Example");
PieSlice *slice = new PieSlice(0, 60);
scene()->addItem(slice);
slice->setPos(150, 150);
}
protected:
void mousePressEvent(QMouseEvent *event) override
{
PieSlice *slice = qgraphicsitem_cast<PieSlice *>(scene()->itemAt(event->pos()));
if (slice) {
QPropertyAnimation *animation = new QPropertyAnimation(slice, "startAngle");
animation->setDuration(1000);
animation->setStartValue(slice->startAngle());
animation->setEndValue(slice->startAngle() + 90);
animation->start();
}
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
GraphicsView view;
view.show();
return app.exec();
}
```
在这个示例代码中,我们创建了一个 `PieSlice` 类,用于绘制扇形。然后在 `GraphicsView` 类中,我们在场景中添加了一个 `PieSlice` 对象,并在鼠标点击事件中使用 `QPropertyAnimation` 类来旋转扇形。可以通过修改 `PieSlice` 类的构造函数中 `startAngle` 和 `spanAngle` 参数的值来更改扇形的大小和位置。
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