问题描述
我想知道如何在旋转一个Libgdx textureRegion。
I wonder know how to Rotate a textureRegion in Libgdx.
如果有一个与像素图一isue，你也可以把它给我。
If there is a isue with Pixmap, you can also give it to me.
我不希望使用精灵，因为它不是为appropiate我想要做的事。
I don't want to use sprites because it's not appropiate for the thing I want do.
谢谢你。
推荐答案
它实际上是pretty简单的为90°的倍数旋转textureRegion。
It is actually pretty simple to rotate a textureRegion with multiples of 90°.
一个textureRegion是一个更大的纹理的一部分，具有UV坐标两对夫妇来定义。
为了旋转你的textureRegion，你探微要旋转这些UV坐标。
A textureRegion is a portion of a bigger Texture, defined with two couples of UV coordinates.In order to rotate your textureRegion, you juste have to rotates these UV coordinates.
例如，这里是你原来textureRegion：
For instance, here is you original textureRegion:
（我们假定你的区域是一个正方形，但它会用矩形工作以及）
顺时针旋转90，你只需要已换坐标：
(we're assuming that your region is a square, but it would work with a rectangle as well)To rotate 90 clockwise, you need just have to swap coordinates:
u1 = u1
v1 = v2
u2 = u2
v2 = v1
哪样的：
您可以用概括变换矩阵（旋转，平移，缩放）这个解决方案，但对于90°旋转多次，你只需要交换坐标。
You can generalize this solution with transformation matrix (rotation, translation, scaling), but for 90° multiple rotation, you just need to swap coordinates.
编辑：包含了所有你需要知道更改textureRegion的UV坐标
This page contains all you need you know to change UV coordinates of a textureRegion
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