/*
    Written by Aaron Porter on 12/4/1998

    This class demonstrates how to derive a class from
    GifServlet and dynamically create an image.
    
    aaron_porter@hotmail.com
*/

import java.awt.*;
import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

import com.mongus.servlet.GifServlet;
import com.mongus.util.ServletTools;

public class ImageExample extends GifServlet
{
    protected long getCacheLifespan()
    {
        return 3600; // 1 hour (3600 seconds in one hour)
    }
    
    public Dimension getImageSize(HttpServletRequest request)
    {
        return new Dimension(ServletTools.getIntParameter(request, "width", 50), 
                             ServletTools.getIntParameter(request, "height", 50));
    }

    public void paint(Graphics graphics, HttpServletRequest request)
    {
        // Setup the colors
        Color transparent = ServletTools.getColorParameter(request, "transparent", Color.magenta);
        Color background = ServletTools.getColorParameter(request, "background", Color.yellow);
        Color foreground = ServletTools.getColorParameter(request, "foreground", Color.black);
        
        // Get the requested image size        
        Dimension imageSize = getImageSize(request);
            
        // Set the transparent color to magenta
        setTransparentColor(transparent);

        // Draw our pretty picture :-)
        
        graphics.setColor(transparent);
        graphics.fillRect(0, 0, imageSize.width, imageSize.height);
    
        graphics.setColor(background);
        graphics.fillOval(0, 0, imageSize.width - 1, imageSize.height - 1);

        graphics.setColor(foreground);
        graphics.drawOval(0, 0, imageSize.width - 1, imageSize.height - 1);

        int eyeHeight = imageSize.height / 6;
        int eyeWidth = imageSize.width / 6;

        graphics.fillOval(imageSize.width / 2 - (int)(eyeWidth * 1.5), eyeHeight * 2, eyeWidth, eyeHeight);
        graphics.fillOval(imageSize.width / 2 + (int)(eyeWidth * .5), eyeHeight * 2, eyeWidth, eyeHeight);

        graphics.drawArc(imageSize.width / 2 - (int)(eyeWidth * 1.5), imageSize.height / 2, eyeWidth * 3, imageSize.height / 3, 180, 180);
    }
}