Source Code : Clips the input image to the specified shape

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Clips the input image to the specified shape

 

//package com.ryanm.util.image;

import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.image.BufferedImage;

/**
 * @author ryanm
 */
public class ImageClip
{
  /**
   * Clips the input image to the specified shape
   * 
   * @param image
   *           the input image
   * @param clipVerts
   *           list of x, y pairs defining the clip shape, normalised
   *           to image dimensions (think texture coordinates)
   * @return The smallest image containing those pixels that fall
   *         inside the clip shape
   */
  public static BufferedImage clip( BufferedImage image, float... clipVerts )
  {
    assert clipVerts.length >= 6;
    assert clipVerts.length % 2 == 0;

    int[] xp = new int[ clipVerts.length / 2 ];
    int[] yp = new int[ xp.length ];

    int minX = image.getWidth(), minY = image.getHeight(), maxX = 0, maxY = 0;

    for( int j = 0; j < xp.length; j++ )
    {
      xp[ j ] = Math.round( clipVerts[ 2 * j ] * image.getWidth() );
      yp[ j ] = Math.round( clipVerts[ 2 * j + 1 ] * image.getHeight() );

      minX = Math.min( minX, xp[ j ] );
      minY = Math.min( minY, yp[ j ] );
      maxX = Math.max( maxX, xp[ j ] );
      maxY = Math.max( maxY, yp[ j ] );
    }

    for( int i = 0; i < xp.length; i++ )
    {
      xp[ i ] -= minX;
      yp[ i ] -= minY;
    }

    Polygon clip = new Polygon( xp, yp, xp.length );
    BufferedImage out = new BufferedImage( maxX - minX, maxY - minY, image.getType() );
    Graphics g = out.getGraphics();
    g.setClip( clip );

    g.drawImage( image, -minX, -minY, null );
    g.dispose();

    return out;
  }
}

   
  

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