如何使用 QGraphicsView 的 translate() 函数? [英] How to use the QGraphicsView's translate() function?

问题描述

这里我有一个场景和一个关联的视图，然后我在场景坐标中有一个位置.我想用这个位置设置视口的中心.我该怎么做?我尝试使用 translate() 函数但它不起作用?

here i have a scene and a associated view ,then i hava a position in the scene coordinates.I want to set the center of the viewport with the position.How can i do it? I try to use the translate() function but it didn't work?

view->translate(10, 10);

视口应该随着 delta x 10 和 delta y 10 移动，但它不起作用！

The viewport should move with the delta x 10, and delta y 10, but it didn't work!

推荐答案

需要将图形视图的变换锚点模式设置为NoAnchor.

You need to set the transformation anchor mode of the graphics view to NoAnchor.

setTransformationAnchor(QGraphicsView::NoAnchor);

这可以防止图形视图如其他锚点模式(AnchorViewCenter、AnchorUnderMouse)所预期的那样撤消平移.

This prevents the graphics view from undoing the translation as expected by the other anchor modes (AnchorViewCenter, AnchorUnderMouse).

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