在Java Swing中缩放JPanel [英] Zoom JPanel in Java Swing

问题描述

我有一个现有的 Java Swing 应用程序。在应用程序的中间是一个 JPanel ，我希望能够放大和缩小。 JPanel 上有一些 JComponents （主要是其他 JPanels 和 JLabels ）。

I have an existing Java Swing application. In the middle of the application is a single JPanel which I want to be able to zoom in and out of. The JPanel has a number of JComponents on it (mostly other JPanels and JLabels).

此外鼠标位置也需要适当调整 - 所以 mouseevents 即使在 JPanel 被缩放后也需要保持相同。因此，只需更改每个组件的 paint 方法似乎不合理。

Also mouse position will need to be adjusted appropriately as well - so mouseevents need to remain same even after the JPanel has been zoomed. As such simply changing the paint methods of each component doesn't seem plausible.

编辑：

好的我使用 MagnifierUI class 进行一些小修改。但是我创建的放大面板有错误的 mouseevents - 即面板是缩放的， mouseevents 不是。

OK i kind of got it working using the MagnifierUI class with some minor edits. However the magnified panel I create has the wrong mouseevents - i.e. the panel is scaled, mouseevents are not.

推荐答案

这只是一个方面：

• 在你的 JPanel 中跟踪 AffineTransform 表示比例因子（参见 AffineTransform.scale（double，double），


• 在调用 super.paint <之前覆盖 JPanel 的 paint 方法： / code>将仿射变换应用于 Graphics2D 对象（从 paint 方法的参数强制转换）通过调用 Graphics2D.setTransform（AffineTransform），之后调用 super.paint


• 覆盖方法 processMouseEvent ， processMouseMotionEvent 和 processMouseWheelEvent ，将仿射变换应用于其鼠标事件参数的坐标（ AffineTransform.transform（java.awt.geom.Point2D，java.awt.geom.Point2D）），调用相应的 super -method之后。

• in your JPanel keep track of an AffineTransform which represents the scale factor (see AffineTransform.scale(double,double),
• override the paint method of your JPanel: before calling super.paint apply the affine transformation to your Graphics2D object (cast from the parameter of the paint method) by calling Graphics2D.setTransform(AffineTransform), call super.paint afterwards
• override the methods processMouseEvent, processMouseMotionEvent and processMouseWheelEvent, apply the affine transformation to the coordinates of their mouse event parameter (AffineTransform.transform(java.awt.geom.Point2D,java.awt.geom.Point2D)), call respective super-method afterwards.

希望这会有所帮助。

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