Android的 - 裁剪从多点的图像 [英] Android - Crop an image from multipoints

问题描述

我需要裁剪位图，但不是在一个矩形裁剪图像（这是我成功设法做到），我需要它是任何形式的按定义的坐标。

我下面从这个线程的答案：<一href="http://stackoverflow.com/questions/8993292/cutting-a-multipoint-ploygon-out-of-bitmap-and-placing-it-on-transparency">Cutting多点ploygon出位图，并把它放在透明，并试图实现它，但不幸的是它不裁剪图像。

我一样的描述，但似乎有一个错误的地方。所述绘制图像中的矩形的方法。 我失去了一些东西？

 位图originalBitmap = BitmapFactory.de codeResource（getResources（），R.drawable.test_image）;
//图像裁剪
位图croppedBitmap = Bitmap.createBitmap（originalBitmap，10，10，200，200）;
帆布油画=新的Canvas（croppedBitmap）;

//创建一个路径
路径path =新路径（）;
path.setFillType（FillType.INVERSE_EVEN_ODD）;
path.moveTo（0，0）;
path.moveTo（0，100）;
path.moveTo（100，0）;
path.moveTo（0，0）;

//与Xfermode涂料
涂料粉刷=新的油漆（）;
paint.setXfermode（新PorterDuffXfermode（PorterDuff.Mode.CLEAR））;

//绘制路径
canvas.drawPath（路径，油漆）;

imageView.setImageBitmap（croppedBitmap）;
 

解决方案

我是非常接近的解决方案。在这里，它是：

  compositeImageView =（ImageView的）findViewById（R.id.imageView）;

位图bitmap1 = BitmapFactory.de codeResource（getResources（），R.drawable.batman_ad）;
位图bitmap2 = BitmapFactory.de codeResource（getResources（），R.drawable.logo）;

位图resultingImage = Bitmap.createBitmap（320，480，bitmap1.getConfig（））;

帆布油画=新的Canvas（resultingImage）;

涂料粉刷=新的油漆（）;
paint.setAntiAlias​​（真正的）;
路径path =新路径（）;
path.lineTo（150，0）;
path.lineTo（230，120）;
path.lineTo（70，120）;
path.lineTo（150，0）;

canvas.drawPath（路径，油漆）;

paint.setXfermode（新PorterDuffXfermode（Mode.SRC_IN））;
canvas.drawBitmap（bitmap2，0，0，油漆）;

compositeImageView.setImageBitmap（resultingImage）;
 

I need to crop a Bitmap, but instead of having a rectangular cropped image (which I managed successfully to do), I need it to be any form defined by coordinates.

I'm following the answer from this thread: Cutting a multipoint ploygon out of Bitmap and placing it on transparency , and trying to implement it, but unfortunatly it does not clip the image.

I did as in the description, but it seems there's a bug somewhere. The image is drawn in rectangular way. Am I missing something?

Bitmap originalBitmap=BitmapFactory.decodeResource(getResources(), R.drawable.test_image);
// Image cropped
Bitmap croppedBitmap=Bitmap.createBitmap(originalBitmap, 10, 10, 200, 200);
Canvas canvas=new Canvas(croppedBitmap);

// Create a path
Path path=new Path();
path.setFillType(FillType.INVERSE_EVEN_ODD);
path.moveTo(0, 0);
path.moveTo(0, 100);
path.moveTo(100, 0);
path.moveTo(0, 0);

// Paint with Xfermode
Paint paint=new Paint();
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

// Draw the path
canvas.drawPath(path, paint);

imageView.setImageBitmap(croppedBitmap);

解决方案

I was very close to the solution. Here it is:

compositeImageView = (ImageView) findViewById(R.id.imageView);

Bitmap bitmap1=BitmapFactory.decodeResource(getResources(), R.drawable.batman_ad);
Bitmap bitmap2=BitmapFactory.decodeResource(getResources(), R.drawable.logo);

Bitmap resultingImage=Bitmap.createBitmap(320, 480, bitmap1.getConfig());

Canvas canvas = new Canvas(resultingImage);

Paint paint = new Paint();
paint.setAntiAlias(true);
Path path=new Path();
path.lineTo(150, 0);
path.lineTo(230, 120);
path.lineTo(70, 120);
path.lineTo(150, 0);

canvas.drawPath(path, paint);

paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
canvas.drawBitmap(bitmap2, 0, 0, paint);

compositeImageView.setImageBitmap(resultingImage);

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