Android Freehand bitmap cropping

问题

I know we can crop a bitmap in rectangular shape using:

Bitmap.createBitmap(source, x, y, width, height)

But I want to know to crop a bitmap in freehand mode or some polygon shape. Its best example can be seen in Jigsaw Puzzle game

I have spent a lot of time googling about this but found no help. Can anybody help me in this regard?

回答1:

You can use a Path to determine a clip area on your Canvas when drawing a Bitmap.

For a full example see:

Android - Crop an image from multipoints

and also:

Cutting a multipoint ploygon out of Bitmap and placing it on transparency

来源：https://stackoverflow.com/questions/13468765/android-freehand-bitmap-cropping