java - 在 Java Swing 中缩放 JPanel

Question

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我想要的单曲zoom in and out。上面有JPanel很多JComponents（主要是 otherJPanels和JLabels）。

此外mouse，位置也需要适当调整 - 因此即使在缩放mouseevents后也需要保持不变。JPanel因此，简单地改变paint每个方法component似乎并不合理。

编辑：

好的，我MagnifierUI class通过一些小的编辑让它工作了。然而，我创建的放大面板有错误mouseevents- 即面板被缩放，mouseevents不是。

Answer 1

This is just a scetch:

• 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.

Hope this helps.

Answer 2

试试 SwingUtilities.convertPoint(source, point,destination);