private void OnContactMove(ScatterRectangle rectangle, FingerEventArgs e)
{
int index = (int)rectangle.Category;
if (!_elementsContacts[index].ContainsKey(e.FingerID)) return;
Point position = rectangle.TranslatePoint(e.Position, _canvas);
_elementsContacts[index][e.FingerID].UpdatePosition(position);
FixedHingeJoint joint;
if (_contactJoints.TryGetValue(e.FingerID, out joint))
{
// move
joint.Anchor = new Vector2D((Scalar)position.X, (Scalar)position.Y);
}
}
private void OnNewContact(ScatterRectangle rectangle, FingerEventArgs e)
{
int index = (int)rectangle.Category;
//not a new contact
if (_elementsContacts[index].ContainsKey(e.FingerID))
return;
//e.Position stands the whole table, get the relative position of Target, i.e. Design Window here
Point position = rectangle.TranslatePoint(e.Position, _canvas);
Vector2D contactPoint = new Vector2D((Scalar)position.X, (Scalar)position.Y);
_fingers.Add(position);
Body body = _bodies[index];
if (body.Shape.CanGetIntersection)
{
FixedHingeJoint joint = PhysicsHelper.FixedHingeJointFactory(body, contactPoint, new Lifespan());
_engine.AddJoint(joint);
_contactJoints[e.FingerID] = joint;
_contactBody[e.FingerID] = body;
_elementsContacts[index].Add(e.FingerID, new Contact(e.FingerID, position));
}
rectangle.CaptureFinger(e.FingerID);
}
private ScatterRectangle HitTest(ScatterRectangle rectangle, FingerEventArgs args)
{
Point global = rectangle.TranslatePoint(args.Position, _canvas), temp;
ScatterRectangle curr;
BitmapImage bi;
byte[] pixel = new byte[4];
for (int i = 0; i < _canvas.Pieces.Length; ++i)
{
curr = _canvas.Pieces[i];
temp = _canvas.TranslatePoint(global, curr);
if (temp.X > curr.Width || temp.X < 0 || temp.Y > curr.Height || temp.Y < 0) continue;
bi = (curr.Background as ImageBrush).ImageSource as BitmapImage;
bi.CopyPixels(new System.Windows.Int32Rect((int) (temp.X / curr.Width * bi.PixelWidth),
(int) (temp.Y / curr.Height * bi.PixelHeight), 1, 1), pixel,
bi.PixelWidth * 4, 0);
if (pixel[3] != 0)
return curr;
}
return null;
}