Libgx旋转纹理区域 [英] Libgx Rotate a Texture Region

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：此页面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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