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Author: Archive (posted 2017-04-27 17:45:51, viewed 1786 times)

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import static ffp.FFP.*;
import static ffp.FFPAUX.*;

/*
 * sierpinski.java
 * This program demonstrates the fractal sierpinski triangle created
 * by randomly choosing between three vertices and moving the point halfway
 * to the chosen vertex.
 */
public class sierpinski extends eutvideo {

   public static void main(String[] args) {
      eut_video_create(EUT_RGB | EUT_STATIC, new sierpinski());
   }

   public static void reshape(int w, int h) {
      ffpViewport(0, 0, w, h);
      create_projection(w, h);
   }

   private static void create_projection(int w, int h) {
      ffpMatrixMode(FFP_PROJECTION);
      ffpLoadIdentity();
      if (w <= h) {
         ffpauxOrtho2D(-1.0f, 1.0f, -1.0f, 1.0f * h / w);
      } else {
         ffpauxOrtho2D(-1.0f, 1.0f * w / h, -1.0f, 1.0f);
      }
      ffpMatrixMode(FFP_MODELVIEW);
   }

   @Override
   public void eut_init(int video_mode) {
      reshape(window_width, window_height);
      point[0] = (float) Math.random() - 0.5f;
      point[1] = (float) Math.random() - 0.5f;
   }

   @Override
   public void exm_update() {

   }

   private float[] point = new float[2];

   private float[][] verts = { { -0.6f, -0.6f }, { 0.6f, -0.6f }, { 0, 0.5f } };

   @Override
   public void eut_render() {
      ffpPointSize(8);
      ffpBegin(FFP_POINTS);
      ffpColor3f(0.0f, 1.0f, 0.0f);
      ffpVertex2fv(verts[0]);
      ffpVertex2fv(verts[1]);
      ffpVertex2fv(verts[2]);
      ffpEnd();

      int vert = (int) (Math.random() * 3);
      point[0] = (verts[vert][0] + point[0]) / 2.0f;
      point[1] = (verts[vert][1] + point[1]) / 2.0f;

      ffpPointSize(2);
      ffpBegin(FFP_POINTS);
      ffpColor3f(1.0f, 1.0f, 1.0f);
      ffpVertex2fv(point);
      ffpEnd();

      ffpFlush(FFP_MULTI_THREADED);
   }

   @Override
   public void eut_resize(int wnd_width, int wnd_height) {
      if (wnd_width <= window_width && wnd_height <= window_height) {
         bind_video(0, 0, wnd_width, wnd_height);
      }
      create_projection(wnd_width, wnd_height);
   }

}





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