JComponent JPanel缩放，平移和坐标问题 [英] JComponent JPanel Zoom, pan and Coordinates Question

问题描述

我有一个 JPanel ，其中包含一个用户可以缩放和平移的矢量图像。覆盖此图像是（透明） JComponent ，我允许用户注释底层图像。这在全尺寸下工作得很好，但如果我使用 AffineTransform 放大，则叠加坐标也会受到影响。因此，如果用户在图像上绘制一个框，则该框也会缩放。

I have a JPanel with an vector image that the user can zoom and pan on. Overlaying this image is a (transparent) JComponent, which I allow the user to annotate the underlying image. This works great at full scale, but If I zoom in, using AffineTransform, the overlaying coordinates are affected also. So, If a user draws a box on the image the box is scaled also.

有关如何解除此行为的任何建议吗？因此 JComponent 不受 JPanel 的 AffineTransform ？

Any suggestions on how to decouple this behaviour? So that the JComponent is not affected by the JPanel's AffineTransform?

推荐答案

通常，您需要前向和反向变换才能在两个坐标系之间进行转换。在此示例中，缩放方程式是明确的;在此备用方法中，使用了第二个 AffineTransform 。

Typically, you need both a forward and inverse transform to translate between the two co-ordinate systems. In this example, the scaling equations are explicit; in this alternate approach, a second AffineTransform is used.

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