Calculate dvd bounce paths with processing sketch designed to iterate all choices

dvd_bounce_paths/dvd_bounce_paths.pde

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+import static javax.swing.JOptionPane.*;
+
+float xmin = -57.0;
+  
+PrintWriter output, changes;
+
+float xmax = 57.0;
+
+float ymin = -145.75;
+float ymax = 145.75;
+
+float xscale = 1080.0 / (xmax * 2.0);
+float yscale = 1920.0 / (ymax * 2.0);
+
+float startx = 1;//566.0, 893.0
+float starty = 1;
+
+float x = 0.0;
+float y = 0.0;
+
+float lastx = 1.0;
+float lasty = 1.0;
+
+int frames = 500;
+int angle = 45;
+int startangle = 45;
+
+float distance = 20.0;
+int colorNumber = 0;
+
+boolean changed = false;
+
+PGraphics pg;
+
+boolean ranOnce = false;
+
+void setup () {
+  size(540, 960);
+  pg = createGraphics(1080, 1920);
+
+
+  //frameRate(30);
+}
+
+void logPath () {
+  output.print('{');
+  output.print(map(x, 0.0, 1080.0, xmin, xmax));
+  output.print(',');
+  output.print(map(y, 0.0, 1920.0, ymin, ymax));
+  output.print('}');
+  output.println(',');
+}
+
+void logChange(){
+  changes.print('{');
+  changes.print(colorNumber); 
+  changes.print('}');
+  changes.println(',');
+}
+
+void draw () {
+  if (!ranOnce) {
+    x = startx;
+    y = starty;
+    angle = startangle;
+    print(x);
+    print(", ");
+    print(y);
+    print(" - ");
+    println(frames);
+  
+    pg.beginDraw();
+    pg.background(0);
+    pg.fill(255);
+    pg.stroke(255);
+    //output = createWriter("log.txt"); 
+    //changes = createWriter("changes.txt");
+    
+    for (int i = 0; i < frames; i++) {
+      changed = false;
+      
+      if (i > 0) {
+        pg.stroke(255, 0, 0);
+        pg.line(lastx, lasty, x, y);
+        pg.stroke(255, 255, 255);
+      } else {
+       pg.ellipse(x, y, 4, 4);
+      }
+      
+      pg.point(x, y);
+      
+      lastx = x;
+      lasty = y;
+      
+      //logPath();
+      
+      x = x + distance * cos((float) angle * PI / 180.0);
+      y = y + distance * sin((float) angle * PI / 180.0);
+      
+      if (x >= 1080.0 || x <= 0.0) {
+        angle = 180 - angle;
+        changed = true;
+      } 
+      if (x >= 1080.0) x = 1080.0;
+      if (x <= 0.0) x = 0.0;
+      if (y >= 1920.0 || y <= 0.0) {
+        angle = 360 - angle;
+        changed = true;
+      }
+      if (y >= 1920.0) y = 1920.0;
+      if (y <= 0.0) y = 0.0;
+      
+      //logChange();
+      if (changed) {
+        colorNumber++; 
+      }
+    }
+    pg.ellipse(x, y, 4, 4);
+    pg.endDraw();
+    image(pg, 0, 0, width, height);
+    
+    /*output.flush(); // Writes the remaining data to the file
+    output.close(); // Finishes the file
+    changes.flush();
+    changes.close();*/
+    
+    //ranOnce = true;
+  }
+  
+  startx++;
+  if (startx >= 1079.0) {
+    startx = 0;
+    starty++;
+  }
+  if (starty >= 1920.0) {
+    starty = 0;
+    frames++;
+  }
+  if (angle == startangle && abs(x - startx) < 5 && abs(y - starty ) < 5 ) {
+    ranOnce = true;  
+  }
+}
+
+void keyPressed () {
+  if (keyCode == UP) {
+    starty--;
+    if (starty < 0) starty = 0;
+    ranOnce = false;
+  } else if (keyCode == DOWN) {
+    starty++;
+    if (starty > 1920.0) starty = 1920.0;
+    ranOnce = false;
+  } else if (keyCode == LEFT) {
+    startx--;
+    if (startx < 0) startx = 0;
+    ranOnce = false;
+  } else if (keyCode == RIGHT) {
+    startx++;
+    if (startx > 1080.0) startx = 1080.0;
+    ranOnce = false;
+  } else if (key == 'f') {
+    String framesStr = showInputDialog("frames?");
+    if (framesStr != null) {
+      frames = parseInt(framesStr);
+      ranOnce = false;
+    }
+  }
+}
+
+void mousePressed() { 
+  startx = floor(map(mouseX, 0.0, width, 0.0, 1080.0));
+  starty = floor(map(mouseY, 0.0, height, 0.0, 1920.0));
+  ranOnce = false;
+}