如何在Direct2D中绘制透明线 [英] How to draw a transparent line in Direct2D

问题描述

我从Direct2D和VC ++ 2013开始。我试图绘制一条50％透明度的宽线。在Microsoft网站上，我只能找到使用Brush填充透明颜色的透明度示例。有人可以展示如何在Direct2D中绘制透明的线条。谢谢。



以下应该是Microsoft网页上处理不透明度的链接。



不透明蒙版概述

I am starting with Direct2D and VC++2013. I am trying to draw a wide line with 50% transparency. On the Microsoft web site I can only find examples of transparency which use the Brush to fill in a transparent color. Can someone show how to draw lines that are transparent in Direct2D. Thanks.

Below should be a link to the Microsoft webpage that dealing with Opacity.

Opacity Masks Overview

推荐答案

为什么不说你的线是一个矩形而只是用透明色填充它？



[更新]

Why don't you say that your line is a rectangle and simply fill it with your transparent colour ?

[Update]

Quote：

大多数行是DIAGONAL，所以不能用矩形表示。 （我没有打扰投票，但如果我这样做，我也会投票。）

Most lines are DIAGONAL, so cannot be represented by a rectangle. (I didn't bother voting, but if I did, I would also downvote.)

我同意答案很短。

但你是在你的分析中犯了一个错误，看起来你认为一个矩形是水平的或垂直的，但你犯了一个错误。

当你旋转一个矩形时，它会保持一个矩形，甚至旋转。 br />


通过用矩形替换线，可以创建一个多边形，并且可以使用画笔工具来填充它。

I agree that the answer was short.
But you are making a mistake in your analyze, it looks like you believe that a rectangle is either horizontal or vertical, but you make a mistake.
When you rotate a rectangle, it stay a rectangle, even rotated.

By replacing the line by a rectangle, you make a polygon and the brush tool can be used to fill it.

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