如何使用四个(x，y)坐标裁剪图像 [英] How to crop the image using four (x,y) coordinates

问题描述

在我的应用程序中，我将使用四个(x，y)坐标来裁剪图像，并且还需要在另一个活动屏幕中显示裁剪后的图像.例如，在下图中，我要裁剪白色图层本身.因此任何人都可以提供解决方案以在我的项目中完成这项技术.

In my application ,I am going to crop the image using four (x,y) coordinates and also I need to show the cropped image in another activity screen. For example, In the below image, i want to crop the white layer itself. so any one provide the solution to accomplish this technique in my project.

推荐答案

使用Bitmap类的实例，可以使用Bitmap.creatBitmap();.方法传递原始图像x y(对于左上角)，然后传递宽度和高度.

Using an instance of the Bitmap class, you can use the Bitmap.creatBitmap(); method passing the original image x y (for the top left corner) and then width and height.

请参阅此处的文档.

在您的原始示例中为:

Bitmap newBitmap=Bitmap.createBitmap(oldBitmap,10,20,70,80);

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编辑

Bitmap类还允许您访问像素int表示颜色的数组.如果您知道要根据每个点的坐标进行裁剪的形状.您可以遍历数组，并将形状之外的alpha设置为全屏.

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Edit

The Bitmap class also allows you to access an array of pixel int's representing color. if you know the shape you want to crop in terms of co-ordinates of each point. you could iterate through the array and set alpha to full on the ones that are outside your shape.

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