Android的＆放大器;切取位图（删除）形状 [英] Android & cut (remove) shape from bitmap

问题描述

你怎么切（删除）从位图的一部分？？？ 我想那款/形状被删除..留下透明代替节.. 说造型色格拉或正方形。

How do you cut (remove) a section from a bitmap??? I want that section/shape to be removed.. leave transparent in place of section.. Say shape is cercle or square..

推荐答案

<打击>你应该能够做到这一点的，波特 - 达夫彩色滤光片和一个画布：

public void punchHole(Bitmap bitmap, float cx, float cy, float radius) {
    Canvas c = new Canvas(bitmap);
    Paint paint = new Paint();
    paint.setColorFilter(new PorderDuffColorFilter(0, PorderDuff.Mode.CLEAR));
    c.drawCircle(cx, cy, radius, paint);
}

嗯，这是错误的。然而，使用波特 - 达夫传输模式不工作：

Well, that was wrong. However, using a Porter-Duff transfer mode does work:

public void punchHole(Bitmap bitmap, float cx, float cy, float radius) {
    Canvas c = new Canvas(bitmap);
    Paint paint = new Paint();
    paint.setXferMode(new PorterDuffXferMode(PorterDuff.Mode.CLEAR));
    c.drawCircle(cx, cy, radius, paint);
}

（通过为ARG位图需要被修改的，当然。）

(The bitmap passed as an arg needs to be modifiable, of course.)

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