How can I crop an image with negative crop-boundaries in Java?

问题

I have an image of some arbitrary size, and I need to crop it with negative boundary values.

So, basically I have image (1) and I want to crop it to the dimensions of (2).

         (1)
          +---------------------------+
 (2)      |                           |
  +-----------------------------+     |
  |       |                     |     |
  |       |                     |     |
  |       |                     |     |
  |       |                     |     |
  +-----------------------------+     |
          |                           |
          +---------------------------+

Any ideas on how to solve this in Java?

I've tried the Scalr library, but it doesn't support negative crop boundaries.

回答1:

You don't need a library for this task.

You can create the new image that is resulted this way:

BufferedImage newImage = new BufferedImage(width, height, imageType);

Then you can crop the piece you need from the old image this way:

BufferedImage tempImage = oldImage.getSubimage(0, y, otherWidth, height);

Then, you place the tempImage in the newImage:

Graphics2D g2 = newImage.createGraphics();
g2.drawImage(tempImage, x, 0, otherWidth, height, null);
g2.dispose();

• width is the image1 width
• height is the image1 width
• x is the top intersection point between the 2 images on the x axis
• y is the top intersection point between the 2 images on the y axis
• otherWidth is width - x

回答2:

Cant you just put the image inside a div set to display as block with a set height and width then just position the image to the right of the containing div?

来源：https://stackoverflow.com/questions/12458907/how-can-i-crop-an-image-with-negative-crop-boundaries-in-java