289 - Simple Renderer

//
//  SimpleRenderer.java
//  Easel
//
//  Created by Philip Rhodes on 7/22/05.
//  Copyright 2005 __MyCompanyName__. All rights reserved.
//

import java.awt.*;
import java.awt.image.*;

/** SimpleRenderer renders Shapes to the screen by simply ignoring the z
 *  coordinate of every vertex. There is no perspective.  Triangles are
 *  drawn using lines, so there is no shading either. Also, triangles that
 *  are in the "back" of an object are still drawn, so objects look
 *  transparent.
 */
 public class SimpleRenderer extends VolatileImageRenderer {

   float [] poly_vertices;
   Polygon poly;

   Matrix projectionMatrix;


   /** Create a SimpleRenderer that renders the shapes in the World w.
    */
   SimpleRenderer(World w, int width, int height, boolean showFPS){

      super(w, width, height, showFPS);


      Matrix s = new ScalingMatrix(1, -1, 0);
      Matrix t = new TranslationMatrix(width/2, height/2, 0);

      this.projectionMatrix = new Matrix(t,s);

      this.poly = new Polygon();

      this.poly_vertices = new float[9];

   }

   /** Draw the shapes in the World associated with this renderer to the
    *  backing image, which will then be drawn to the screen when
    *  paintComponent is called by Swing.
    */
   public  void render(){

      super.render();

      int numTriangles = this.world.numTriangles();

      this.world.computeWorldCoords();

      synchronized(this.backingImage){

         waitUntilPainted();

         this.imageGraphics.setColor(Color.blue);

         for(int ti=0; ti < numTriangles; ti++){

            this.world.getTriangleVertices(ti, this.poly_vertices);
            this.poly.reset();

            this.projectionMatrix.transform(this.poly_vertices);

            for(int vi=0; vi<3; vi++){

               this.poly.addPoint((int) (this.poly_vertices[vi*3]),
                                  (int) (this.poly_vertices[vi*3 + 1]));

            }

            this.imageGraphics.drawPolygon(this.poly);

         }


         readyForPainting();
      }



   }




}