import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;



// Image scaling :http://helpdesk.objects.com.au/java/how-do-i-scale-a-bufferedimage 
public class ImageServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		final int width = 400;
		final int height = 400;
		BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		
		Graphics2D gfx = bufferedImage.createGraphics();
		gfx.setColor( Color.white ); 
		gfx.fillRect(0, 0, width, height); //Graphics2D has many various drawing methods
		gfx.setColor( Color.blue );
		gfx.fillOval(10, 10, width-20, height-20);
		gfx.dispose(); //dispose when we are done with drawing
		
		
		//Downscale image to create a smoother looking one
		BufferedImage smallImage = new BufferedImage(width/2, height/2, BufferedImage.TYPE_INT_RGB);
		gfx = smallImage.createGraphics();
		gfx.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
		gfx.drawImage(bufferedImage, 0, 0, width/2, height/2, null);
		gfx.dispose();
		
		
		
		response.setContentType("image/png");
		ImageIO.write(smallImage, "png", response.getOutputStream() ); // use imageio.read to load a file to a bufferedimage
		
	}

}