裁剪图像/可绘制成三角形 [英] Crop an Image/drawable to a triangle

问题描述

我正在尝试在Android应用中将图像裁剪为三角形，以便仅获得图像的三角形部分。如何才能做到这一点？我已经成功完成了正方形和圆形形状的裁剪，但是无法对三角形进行相同的裁剪。

I'm trying to crop an image to triangle in my Android App so that I only get the triangle portion of the image. How can this be done? I've successfully done the cropping for Square and Circle shapes but I'm unable to do the same for the triangle. Could someone help me with this.

谢谢。

David

推荐答案

您可以使用遮罩图像。在这种情况下，该图像应为三角形（或您需要的任何其他形状），如下所示：

You can Use a "Mask" Image.. this image should be a triangle in your case (or any other shape you need) like this :

 ImageView mImageView= (ImageView)findViewById(R.id.imageview_id);
 Bitmap original = BitmapFactory.decodeResource(getResources(),R.drawable.contentimage);
 Bitmap mask = BitmapFactory.decodeResource(getResources(),R.drawable.mask);
 Bitmap result = Bitmap.createBitmap(mask.getWidth(), mask.getHeight(),  Config.ARGB_8888);
 Canvas mCanvas = new Canvas(result);
 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));
 mCanvas.drawBitmap(original, 0, 0, null);
 mCanvas.drawBitmap(mask, 0, 0, paint);
 paint.setXfermode(null);
 mImageView.setImageBitmap(result);
 mImageView.setScaleType(ScaleType.CENTER);
 mImageView.setBackgroundResource(R.drawable.background_frame);

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