qtchart中如何设置鼠标事件获图标坐标中鼠标的位置,而不是整个窗口中的位置
时间: 2024-10-11 20:07:36 浏览: 63
在QtChart库中,你可以通过监听`QGraphicsSceneHoverEvent`或`QGraphicsSceneMouseEvent`来获取鼠标在图表区域内的坐标,而不是整个窗口。首先,你需要创建一个`QGraphicsView`并关联到你的`QChart`上,然后设置场景(`QGraphicsScene`)的鼠标事件处理器。
以下是一个简单的步骤:
1. 创建`QChart`和`QGraphicsView`:
```cpp
QChart *chart = new QChart();
QGraphicsView *view = new QGraphicsView(chart);
```
2. 设置`QChart`:
```cpp
// ... 初始化并添加图例、系列等...
// 如果你想显示网格线,可以这样做:
chart->addRect(0, 0, view->width(), view->height(), Qt::NoPen, chart->backgroundBrush());
```
3. 给`QGraphicsScene`设置鼠标事件处理器:
```cpp
connect(view->scene(), &QGraphicsScene::hoverEvent, this, &YourClass::onHoverEvent);
connect(view->scene(), &QGraphicsScene::mouseMoveEvent, this, &YourClass::onMouseMoveEvent);
```
4. 实现事件处理函数:
```cpp
void YourClass::onHoverEvent(QGraphicsSceneHoverEvent *event) {
QPointF scenePos = event->pos(); // 鼠标在场景中的坐标
int x = round(scenePos.x()); // 把浮点坐标转换为整数,假设你是想要像素坐标
int y = round(scenePos.y());
// 现在x和y就是鼠标在图表区域内的坐标了
}
void YourClass::onMouseMoveEvent(QGraphicsSceneMouseEvent *event) {
// 同样,这里的event->pos()将返回鼠标在场景中的坐标
}
```
注意,`event->pos()`返回的是屏幕坐标,而`scenePos`则是图表视图内部的坐标。你需要根据实际情况调整坐标系统。
阅读全文
相关推荐












