Crop image based on X, Y coordinates in java

Question

I want to crop my image using 4 XY coordinates in an image. I looked at BufferedImage 's getSubImage method as well however didnt find it useful for my requirement.

Any way to crop it using the 4 coordinates points (x1,y1), (x2,y2), (x3,y3), (x4,y4)

Answer 1

A rectangle in plane with sides parallel to axes can be characterized by two points : top left (x1, y1) and bottom right (x2, y2) corners. So just use getSubImage() appropriately :

/*    
(x1, y1) ....... (w = y2-y1) .. (x2, y1)
 .
 .                                 
 (h = y2-y1)                        
 .
 .
(x1, y2) .......................(x2, y2)  */  

BufferedImage myImaxe;
myImage.getSubImage(x1, y1, (x2-x1), (y2-y1));

Answer 2

You can refer to http://sanjaal.com/java/395/java-graphics/cropping-an-image-in-java-sampletutorial-with-source-code/ for rectangular cropping. Since you have written in your post that you want to crop your image through four x, y co-ordinates I suppose that you want to do non rectangular cropping. Refer to Android - Crop an image from multipoints or How to crop an image in between four points on Android or http://www.java-forums.org/awt-swing/30097-image-cropping.html

Best of Coding!