Slick Forums

package org.newdawn.slick.tests;

import java.io.File;
import java.io.FileOutputStream;

import org.newdawn.slick.AppGameContainer;
import org.newdawn.slick.BasicGame;
import org.newdawn.slick.Color;
import org.newdawn.slick.GameContainer;
import org.newdawn.slick.Graphics;
import org.newdawn.slick.Image;
import org.newdawn.slick.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.imageout.ImageIOWriter;

/**
* A test to demonstrate world clipping as opposed to screen clipping
*
* @author kevin
*/
public class CopyAreaAlphaTest extends BasicGame {
   /** The texture to apply over the top */
   private Image textureMap;
   /** The copied image */
   private Image copy;
    private GameContainer container;
   
   /**
    * Create a new tester for the clip plane based clipping
    */
   public CopyAreaAlphaTest() {
      super("CopyArea Alpha Test");
   }
   
   /**
    * @see org.newdawn.slick.BasicGame#init(org.newdawn.slick.GameContainer)
    */
   public void init(GameContainer container) throws SlickException {
      textureMap = new Image("testdata/grass.png");
      container.getGraphics().setBackground(Color.black);
      copy = new Image(100,100);
      
      this.container = container;
   }

   /**
    * @see org.newdawn.slick.BasicGame#update(org.newdawn.slick.GameContainer, int)
    */
   public void update(GameContainer container, int delta)
         throws SlickException {
   }

   /**
    * @see org.newdawn.slick.Game#render(org.newdawn.slick.GameContainer, org.newdawn.slick.Graphics)
    */
   public void render(GameContainer container, Graphics g)
         throws SlickException {
      g.clearAlphaMap();
      g.setDrawMode(Graphics.MODE_NORMAL);
      g.setColor(Color.white);
      g.fillOval(100,100,150,150);
      textureMap.draw(10,50);
      
      g.copyArea(copy, 100,100);
      g.setColor(Color.red);
      g.fillRect(300,100,200,200);
      copy.draw(350,150);
   }

   /**
    * @see org.newdawn.slick.BasicGame#keyPressed(int, char)
    */
   public void keyPressed(int key, char c) {
        if (key == Input.KEY_F5) {
            try {
                Image image = new Image(container.getWidth(), container.getHeight());
                container.getGraphics().copyArea(image, 0, 0);
               
                // Bug in ImageIOWriter causes the image to be flipped vertically
                //image = image.getFlippedCopy(false, true);

                File file = new File(System.getProperty("user.home") + "/TestScreenshot.jpg");
                FileOutputStream stream = new FileOutputStream(file);
               
                ImageIOWriter writer = new ImageIOWriter();
                writer.saveImage(image, "jpg", stream, false);
            } catch (Exception e) {
                System.err.println("Could not save screenshot: "+e.getMessage());
            }
        }
   }
   
   /**
    * Entry point to our test
    *
    * @param argv The arguments to pass into the test
    */
   public static void main(String[] argv) {
      try {
         AppGameContainer container = new AppGameContainer(new CopyAreaAlphaTest());
         container.setDisplayMode(800,600,false);
         container.start();
      } catch (SlickException e) {
         e.printStackTrace();
      }
   }
}