Round the corners BufferedImage - Java 2D Graphics

Java examples for 2D Graphics:BufferedImage

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Description

Round the corners BufferedImage

Demo Code


//package com.java2s;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import java.awt.geom.RoundRectangle2D;

import java.awt.image.BufferedImage;

public class Main {
    /** Round the corners
     * //from ww  w  .  j  a v a  2  s.com
     * @param image
     * @param cornerRadius
     * @return
     */
    // http://stackoverflow.com/questions/7603400/how-to-make-a-rounded-corner-image-in-java
    public static BufferedImage makeRoundedCorner(BufferedImage image,
            int cornerRadius) {
        int w = image.getWidth();
        int h = image.getHeight();
        BufferedImage output = new BufferedImage(w, h,
                BufferedImage.TYPE_INT_ARGB);

        Graphics2D g2 = output.createGraphics();

        // This is what we want, but it only does hard-clipping, i.e. aliasing
        // g2.setClip(new RoundRectangle2D ...)

        // so instead fake soft-clipping by first drawing the desired clip shape
        // in fully opaque white with antialiasing enabled...
        g2.setComposite(AlphaComposite.Src);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setColor(Color.WHITE);
        g2.fill(new RoundRectangle2D.Float(0, 0, w, h, cornerRadius,
                cornerRadius));

        // ... then compositing the image on top,
        // using the white shape from above as alpha source
        g2.setComposite(AlphaComposite.SrcAtop);
        g2.drawImage(image, 0, 0, null);

        g2.dispose();

        return output;
    }
}

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