Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Motion/Bounce/Bounce.pde

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+/**
+ * Bounce. 
+ * 
+ * When the shape hits the edge of the window, it reverses its direction. 
+ */
+ 
+int rad = 60;        // Width of the shape
+float xpos, ypos;    // Starting position of shape    
+
+float xspeed = 2.8;  // Speed of the shape
+float yspeed = 2.2;  // Speed of the shape
+
+int xdirection = 1;  // Left or Right
+int ydirection = 1;  // Top to Bottom
+
+
+void setup() 
+{
+  size(640, 360);
+  noStroke();
+  frameRate(30);
+  ellipseMode(RADIUS);
+  // Set the starting position of the shape
+  xpos = width/2;
+  ypos = height/2;
+}
+
+void draw() 
+{
+  background(102);
+  
+  // Update the position of the shape
+  xpos = xpos + ( xspeed * xdirection );
+  ypos = ypos + ( yspeed * ydirection );
+  
+  // Test to see if the shape exceeds the boundaries of the screen
+  // If it does, reverse its direction by multiplying by -1
+  if (xpos > width-rad || xpos < rad) {
+    xdirection *= -1;
+  }
+  if (ypos > height-rad || ypos < rad) {
+    ydirection *= -1;
+  }
+
+  // Draw the shape
+  ellipse(xpos, ypos, rad, rad);
+}