如何绘制峰，以闭曲线区域 [英] how to draw pic to Closed curve area

问题描述

霍洛，我想画一个图像的一部分，以封闭曲线，在OnDraw中（画布油画） 我必须用后续的code画一条封闭的曲线     paint.setColor（Color.RED）;     paint.setAlpha（80）;     canvas.drawPath（turnpage.mPath3，油漆）;   我的问题是，如何绘制图像的封闭式area.In换言之的一部分，我想知道如何使用任何部分的图像来填充的紧密区域。谢谢

hollo,i want to draw a part of a image to a Closed curve,in the onDraw(Canvas canvas) i have use the follow code draw a Closed curve paint.setColor(Color.RED); paint.setAlpha(80); canvas.drawPath(turnpage.mPath3, paint); my question is that how to draw a part of a image to the Closed area.In other words,i want to know how to filling the close area by using a any part of a image. thank you

推荐答案

您需要使用XFER模式。这是我的例子，其中一个圆圈是用来冲不过的图像，你只需要使用一个不同的充XFER模式扭转逻辑：<一href="http://stackoverflow.com/questions/5368774/make-certain-area-of-bitmap-transparent-on-touch/5439357#5439357">Make位图的透明触摸的特定区域

You need to use xfer modes. Here is my example where a circle is used to punch though an image, you just need to reverse the logic by using a differnt Xfer mode: Make certain area of bitmap transparent on touch

又如将图像放置到圆角矩形：查找其使用XFER模式答案。 <一href="http://stackoverflow.com/questions/1705239/how-should-i-give-images-rounded-corners-in-android">How我应该给图像圆角的Andr​​oid？

Another example which place an image into a rounded rectangle: Look for the answer which is using Xfer modes. How should I give images rounded corners in Android?

所有XFER模式体现在阿比演示apllication附带的Andr​​oid SDK。在您的Exclipse创建一个新的Andr​​oid项目，然后选择从现有样本项目。选择目标的Andr​​oid版本，然后ApiDemos。运行该应用程序，进入图形然后Xfermodes。

All xfer modes are demonstrated in Api Demos apllication which comes with Android SDK. In your Exclipse create a new Android project and select "Create project from existing sample". Choose target android version and then ApiDemos. Run the app and go to graphics then Xfermodes.

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