Ex 5 : Use of LookupTable

Draw some colored lines on a buffered image.

Display the image in a JFrame.

Use the LookupTable and LookupOp classes and the filter method of BufferedImage to quickly change all the colors in the BufferedImage.

Examples :

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Tip: How to draw the lines

       int xsize = 400;
       int ysize = 400;

       BufferedImage bimage = new BufferedImage(xsize,ysize,BufferedImage.TYPE_INT_RGB);
       Graphics2D g2d = bimage.createGraphics();

       g2d.setColor(new Color(0,0,0));
       g2d.fill(new Rectangle2D.Double(0,0,xsize,ysize));

       int cx1 = 100;
       int cy1 = 200;
       int cr1x = 40;
       int cr1y = 80;

       int cx2 = 300;
       int cy2 = 200;
       int cr2x = 50;
       int cr2y = 130;

       Random rnd = new Random();

       for (int theta=0; theta<360; theta++)
       {
           int phi = theta + 180;

           double xp1 = cx1 + cr1x * Math.cos(Math.toRadians(theta));
           double yp1 = cy1 + cr1y * Math.sin(Math.toRadians(theta));

           double xp2 = cx2 + cr2x * Math.cos(Math.toRadians(phi));
           double yp2 = cy2 + cr2y * Math.sin(Math.toRadians(phi));

           g2d.setColor(new Color(rnd.nextInt(255),rnd.nextInt(255),rnd.nextInt(255)));

           g2d.drawLine((int)xp1, (int)yp1, (int)xp2, (int)yp2);
       }