如何使Texture2D 50％透明? XNA [英] How to make a Texture2D 50% transparent? XNA

问题描述

我正在使用SpriteBatch在屏幕上绘制Texture2D，并且想知道如何处理图像的不透明度?有人知道实现此目标的最佳方法吗?

I'm using SpriteBatch to draw a Texture2D on the screen and was wondering how I could manipulate the the images opacity? Anyone know the best way in accomplishing this?

推荐答案

假定您使用的XNA 4.0与预乘alpha.在您的spritebatch.draw中，将颜色乘以浮点数，将0.5f乘以50％的透明度，然后像平常一样绘制.如果您不使用预乘alpha，出于性能原因，建议您这样做，并且习惯后会更直观.

Assuming you are using XNA 4.0 with premultiplied alpha. In your spritebatch.draw multiply the color by a float, 0.5f for 50% transparency, and draw as you would normally. If you are not using premultiplied alpha I suggest you do for performance reasons and its more intuitive after you get used to it.

示例:

_spriteBatch.Draw(texture, location, Color.White * 0.5f);

还要确保将混合状态设置为BlendState.AlphaBlend或其他支持alpha且不是NonPremultiplied的混合状态.

Also make sure you set your blend state to BlendState.AlphaBlend, or another blend state that supports alpha and is not NonPremultiplied.

示例:

_spriteBatch.Begin(SpriteSortMode.Immediate, BlendState.AlphaBlend);

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