在Java中，如何找出仿射变换后的矩形是否包含某个点? [英] How to find out whether an affine transformed rectangle contains a certain point, in Java?

问题描述

我正在尝试制作交互式GUI，但是每当单击并拖动该矩形时，我都需要移动某个对象.基本上，我想知道经过仿射变换的矩形是否包含特定点(x，y).有没有办法做到这一点?我尝试使用contains()方法，但不适用于已进行仿射变换的矩形.我检查了Java教程，但用户交互式GUI不使用仿射变换.有人可以给我指出一个教程吗，该教程允许用户仿射变换某个形状，并且仅在单击和拖动形状本身时才移动该形状.如果没有，我该如何处理?

I'm trying to make an interactive GUI but I need to move a certain object whenever that rectangle is clicked + dragged. Basically I wanna know whether a rectangle, that has been affine transformed, contains a specific point (x, y). Is there a way to do this? I have tried using contains() method but it doesn't work for a rectangle that has been affine transformed. I checked the Java tutorials but the user interactive GUIs don't use affine transformation. Can someone point me to a tutorial that allows the user to affine transform a certain shape as well as move the shape ONLY when the shape itself is clicked + dragged. If not, how can I approach this?

谢谢.

推荐答案

此示例显示contains()在转换后的Shape上可以正常工作. 示例使用Polygon，但是Rectangle还实现了Shape.

This example shows that contains() works as expected on a transformed Shape. The example uses Polygon, but Rectangle also implements Shape.

如果相反，图形上下文本身已转换，则必须创建一个反函数以捕获对转换所做的更改"，如

If instead the graphics context itself is transformed, you'll have to create an inverse "to capture the changes you make to the transform", as shown this example.

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