裁切图像作为圈中的Andr​​oid [英] Crop Image as circle in Android

问题描述

有谁知道如何裁剪图像\位图转了一圈？ 我找不到任何解决方案，抱歉..

解决方案

罗曼盖伊，以前在Android团队在谷歌一名工程师，贴的绘制一个圆角图片。这个想法可以容易地扩展到一个圆，例如，通过改变圆角矩形半径，使得它创建了一个完整的圆。

从文章：

  

要生成圆形图像，我只是写了一个自定义的绘制对象的   通过绘制一个圆角矩形 Canvas.drawRoundRect（）。诀窍是   使用油漆与 BitmapShader 来填充的圆角矩形   纹理，而不是一个简单的色彩。这是什么code是这样的：

  BitmapShader着色器;着色器=新BitmapShader（位图，
Shader.TileMode.CLAMP，Shader.TileMode.CLAMP）;

涂料粉刷=新的油漆（）; paint.setAntiAlias​​（真正的）;
paint.setShader（着色）;

RectF RECT =新RectF（0.0，0.0，宽，高）;

//矩形包含形状的边界
//半径在圆角像素半径
//涂料包含将纹理化形状着色器
canvas.drawRoundRect（矩形，半径，半径，油漆）;
 

Does anyone know how to crop an image\bitmap to a circle? I can not find any solution, sorry ..

解决方案

Romain Guy, formerly an engineer on the Android team at Google, posted an excellent article on drawing images with rounded corners. This idea could be easily extended to a circle, for example, by changing the rounded rectangle radius so that it creates a complete circle.

From the article:

To generate the rounded images I simply wrote a custom Drawable that draws a rounded rectangle using Canvas.drawRoundRect(). The trick is to use a Paint with a BitmapShader to fill the rounded rectangle with a texture instead of a simple color. Here is what the code looks like:

BitmapShader shader; shader = new BitmapShader(bitmap,
Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);

Paint paint = new Paint(); paint.setAntiAlias(true);
paint.setShader(shader);

RectF rect = new RectF(0.0f, 0.0f, width, height);

// rect contains the bounds of the shape
// radius is the radius in pixels of the rounded corners
// paint contains the shader that will texture the shape
canvas.drawRoundRect(rect, radius, radius, paint);

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