Bufferedimage into circle shape

问题

I have a buffered image from byte array. How do I make the image into a circle? Crop? I don't want a circle, I want the orginal image to become circle shape and display

 def bufferedImage = imgSvc.convertByteArrayToBufferedImage(crop.image)

回答1:

If bufferedImage is squared, then with this code :

int width = bufferedImage.getWidth();
BufferedImage circleBuffer = new BufferedImage(width, width, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = circleBuffer.createGraphics();
g2.setClip(new Ellipse2D.Float(0, 0, width, width));
g2.drawImage(bufferedImage, 0, 0, width, width, null);

you get a circular cropped image in circleBuffer

回答2:

this can help

    g.setClip(new Ellipse2D.Float(x, y, w, h));
    g.drawImage(yourBufferedImage, x, y, w, h, null);

回答3:

You can use setClip() method of the Graphics class to restrict the drawing area of a graphics context to a specific region. The drawback of this is that this clipping will not be anti-aliased.

There are some more advanced tricks to achieve a better-looking result, see the answers to the following questions:

Drawing a part of an image (Java)

How to make a rounded corner image in Java

来源：https://stackoverflow.com/questions/14731799/bufferedimage-into-circle-shape