Slick Forums

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.Input;
import org.newdawn.slick.SlickException;
import org.newdawn.slick.geom.Curve;
import org.newdawn.slick.geom.Vector2f;
import org.newdawn.slick.opengl.renderer.Renderer;

public class AlphaMapAA extends BasicGame {
   private Curve curve1, curve2;
   private boolean useAlphaMap;

   public AlphaMapAA () {
      super("SlickBezier");
   }

   public void init (GameContainer container) throws SlickException {
      curve1 = new Curve(new Vector2f(100, 100), new Vector2f(150, 100), new Vector2f(150, 200), new Vector2f(200, 200));
      curve2 = new Curve(new Vector2f(200, 200), new Vector2f(250, 200), new Vector2f(250, 150), new Vector2f(300, 150));
   }

   public void update (GameContainer container, int delta) throws SlickException {
   }

   public void render (GameContainer container, Graphics g) throws SlickException {
      g.setAntiAlias(true);
      g.drawString("Press space to toggle alpha map.", 10, 30);
      g.setLineWidth(20);
      if (useAlphaMap) {
         g.clearAlphaMap();
         g.setDrawMode(Graphics.MODE_ALPHA_MAP);
         g.setColor(Color.white);
         g.fillRect(0, 0, container.getWidth() * 0.33f, container.getHeight());
         g.fillRect(container.getWidth() * 0.5f, 0, container.getWidth() * 0.33f, container.getHeight());
         g.setDrawMode(Graphics.MODE_ALPHA_BLEND);
      }
      g.setColor(Color.red);
      g.draw(curve1);
      g.draw(curve2);
      if (useAlphaMap) g.setDrawMode(Graphics.MODE_NORMAL);
   }

   public void keyPressed (int key, char c) {
      if (key == Input.KEY_SPACE) useAlphaMap = !useAlphaMap;
   }

   public static void main (String argv[]) {
      Input.disableControllers();
      Renderer.setLineStripRenderer(Renderer.QUAD_BASED_LINE_STRIP_RENDERER);
      Renderer.getLineStripRenderer().setLineCaps(true);
      try {
         AppGameContainer container = new AppGameContainer(new AlphaMapAA());
         container.setDisplayMode(420, 300, false);
         container.setTargetFrameRate(60);
         container.start();
      } catch (SlickException e) {
         e.printStackTrace();
      }
   }
}