Re-adding Topics to SVN

java/examples/Topics/Motion/Reflection2/Ground.pde

@@ -0,0 +1,20 @@
+class Ground {
+  float x1, y1, x2, y2;  
+  float x, y, len, rot;
+
+  // Default constructor
+  Ground(){
+  }
+
+  // Constructor
+  Ground(float x1, float y1, float x2, float y2) {
+    this.x1 = x1;
+    this.y1 = y1;
+    this.x2 = x2;
+    this.y2 = y2;
+    x = (x1+x2)/2;
+    y = (y1+y2)/2;
+    len = dist(x1, y1, x2, y2);
+    rot = atan2((y2-y1), (x2-x1));
+  }
+}