Replacing heading2D with heading for all general examples. Issue #1627

java/examples/Topics/Simulate/Flocking/Boid.pde

@@ -68,10 +68,10 @@ class Boid {
     steer.limit(maxforce);  // Limit to maximum steering force
     return steer;
   }
-  
+
   void render() {
     // Draw a triangle rotated in the direction of velocity
-    float theta = velocity.heading2D() + radians(90);
+    float theta = velocity.heading() + radians(90);
     fill(200,100);
     stroke(255);
     pushMatrix();