问题描述

我正在学习 libgdx，但我被困在一个点上..

I am learning libgdx but i am stuck at a point..

我在我的舞台上添加了一个按钮，现在我想在舞台上添加一个图像，以便图像看起来像按钮的背景图像.我的意思是说按钮应该位于图像上.我一直在寻找教程，但无法做到这一点.

I have added a button in my stage , now i want to add a image in the stage so that the image looks as the background image to the button.i mean to say that the button should lie on the image. I have been looking tutorials but not been able to do that.

怎么做?有什么帮助吗?

How can it be done? any help?

推荐答案

您唯一需要做的就是在绘制Button之前绘制背景.
有几种可能的方法来做到这一点:
- 您可以将背景作为 Image(Actor 的子类)添加到 Stage 并使用 z-index 确保它被绘制为背景.
- 您可以获取 Stage 的 SpriteBatch (stage.getBatch()) 并使用其中一种 draw 方法在调用 stage.draw()

The only thing you need to do is to draw the background, before drawing the Buttons.
There are a few possible ways to do that:
- You can add the background as an Image (subclass of Actor) to the Stage and use the z-index to make sure it is drawn as a background.
- You can get the Stages SpriteBatch (stage.getBatch()) and use one of its draw methods to draw the background, before calling stage.draw()

您也可以使用另一个 SpriteBatch，但我不推荐它，因为它是一个非常重"的对象，在这种情况下它不是必需的.
我猜，在调用 stage.draw() 之前，你需要调用 spritebatch.end()，因为你习惯于 的 SpriteBatch绘制背景.

You could also use another SpriteBatch, but i don't recommend it, as it is a pretty "heavy" object and it is just not neccessaty in this case.
I guess, before calling stage.draw() you need to call spritebatch.end(), for the SpriteBatch you used to draw the background.

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