gravity well now follows the mouse

[physics.git] / src / Effects / Screen.cpp

diff --git a/src/Effects/Screen.cpp b/src/Effects/Screen.cpp
index 85759c8..f7bf80e 100644 (file)
--- a/src/Effects/Screen.cpp
+++ b/src/Effects/Screen.cpp
@@ -34,6 +34,33 @@ Screen::~Screen()
 
 /// ***** Public Class Methods *****
 
+Vector2 Screen::positionDelta(const PhysicsEntity* e, float time_step) const
+{
+    const Vector2& pos = e->positionRaw();
+
+    Vector2 acc(0,0);
+
+    float radius = 0;
+    const Ball* b = dynamic_cast<const Ball*>(e);
+    if( b != NULL )
+        radius = b->getRadius();
+
+
+    if(pos.y > 600-radius)
+        acc.y += 600-radius - pos.y;
+
+    if(pos.y < 0+radius)
+        acc.y += 0+radius - pos.y;
+
+    if(pos.x > 800-radius)
+        acc.x += 800-radius - pos.x;
+
+    if(pos.x < 0+radius)
+        acc.x += 0+radius - pos.x;
+
+    return acc;
+}
+
 Vector2 Screen::velocityDelta(const PhysicsEntity* e, float time_step) const
 {
     const Vector2& pos = e->positionRaw();