private void AddScatterRectangles()
{
_pieces = new ScatterRectangle[7];
for (int i = 0; i < 7; ++i)
{
ScatterRectangle rectangle = new ScatterRectangle();
BitmapImage bi = new BitmapImage();
bi.BeginInit();
bi.UriSource =
new Uri(String.Format("{0}{1}{2}{3}{4}", Environment.CurrentDirectory, Define.ResoucePath,
@"\widgets\tangram", i + 1, ".png"));
bi.EndInit();
rectangle.Background = new ImageBrush(bi);
rectangle.Width = (int)(TangramInformation.TangramWidth[i] * TangramInformation.TangramSize / 100);
rectangle.Height = (int)(TangramInformation.TangramHeight[i] * TangramInformation.TangramSize / 100);
rectangle.Category = (TangramCategory)i;
rectangle.Position = new Point(TangramInformation.TangramInitializationPosition[i].X, TangramInformation.TangramInitializationPosition[i].Y);
this.Children.Add(rectangle);
_pieces[i] = rectangle;
}
}
public static IShape CreateShape(ScatterRectangle target, Scalar width, Scalar height)
{
if (width <= 0) { throw new ArgumentOutOfRangeException("width", "must be greater then 0"); }
if (height <= 0) { throw new ArgumentOutOfRangeException("height", "must be greater then 0"); }
Vector2D[] vertexs = null;
Scalar temp, temp2;
switch (target.Category)
{
case TangramCategory.HorizontalSmallTriangle:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[3]
{
new Vector2D(temp, temp2),
new Vector2D(-temp, temp2),
new Vector2D(0, -temp2)
};
break;
case TangramCategory.VerticalSmallTriangle:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[3]
{
new Vector2D(temp, -temp2),
new Vector2D(temp, temp2),
new Vector2D(-temp, 0)
};
break;
case TangramCategory.Prallelogram:
temp = height * .5f;
temp2 = height + temp;
vertexs = new Vector2D[4]
{
new Vector2D(-temp2, temp),
new Vector2D(-temp, -temp),
new Vector2D(temp2, -temp),
new Vector2D(temp, temp)
};
break;
case TangramCategory.HorizontalBigTriangle:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[3]
{
new Vector2D(-temp, -temp2),
new Vector2D(temp, -temp2),
new Vector2D(0, temp2)
};
break;
case TangramCategory.MiddleTriangle:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[3]
{
new Vector2D(-temp, temp2),
new Vector2D(temp, -temp2),
new Vector2D(temp, temp2)
};
break;
case TangramCategory.Square:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[4]
{
new Vector2D(-temp, 0),
new Vector2D(0, -temp2),
new Vector2D(temp, 0),
new Vector2D(0, temp2)
};
break;
case TangramCategory.VerticalBigTriangle:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[3]
{
new Vector2D(-temp, -temp2),
new Vector2D(temp, 0),
new Vector2D(-temp, temp2)
};
break;
default:
temp = width * .5f;
temp2 = height * .5f;
vertexs = new Vector2D[4]
{
new Vector2D(temp, 0),
new Vector2D(0, temp2),
new Vector2D(-temp, 0),
new Vector2D(0, -temp2)
};
break;
}
return new PolygonShape(vertexs, 2f);
}
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);
}
public static PhysicsState CreateState(ScatterRectangle target, Scalar radius, Scalar width, Scalar height)
{
ALVector2D answer;
answer = new ALVector2D(radius, (float)(target.Position.X + width * .5f), (float)(target.Position.Y + height * .5f));
return new PhysicsState(answer);
}
private void OnContactRemoved(ScatterRectangle rectangle, FingerEventArgs e)
{
int index = (int) rectangle.Category;
if (!_elementsContacts[index].ContainsKey(e.FingerID))
return;
FixedHingeJoint removedJoint;
if (_contactJoints.TryGetValue(e.FingerID, out removedJoint))
{
removedJoint.Lifetime.IsExpired = true;
_contactBody.Remove(e.FingerID);
_contactJoints.Remove(e.FingerID);
}
_elementsContacts[index].Remove(e.FingerID);
_fingers.Remove(e.Position);
}
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 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;
}
private void GetMultiTouchInput(ScatterRectangle rectangle, MultiTouchEventArgs args)
{
ScatterRectangle obj;
foreach (FingerEventArgs e in args.FingerEvents)
{
switch (e.EventType)
{
case FingerEventType.FINGER_DOWN_EVENT:
case FingerEventType.FINGER_IN_EVENT:
obj = HitTest(rectangle, e); // Since each ScatterRectangle is a rectangle but actually some are triangles, we need get the real "rectangle" according to the color of the mouse hit position
if (obj == null) return;
OnNewContact(obj, e);
break;
case FingerEventType.FINGER_MOVE_EVENT:
OnContactMove(rectangle, e);
break;
case FingerEventType.FINGER_OUT_EVENT:
case FingerEventType.FINGER_UP_EVENT:
OnContactRemoved(rectangle, e);
break;
}
}
args.Handled = true;
}
private Body CreateBody(ScatterRectangle rectangle)
{
float radius = MathHelper.ToRadians((Scalar) rectangle.Orientation);
PhysicsState state = PhysicsHelper.CreateState(rectangle, radius, (Scalar)rectangle.Width, (Scalar)rectangle.Height);
IShape shape = PhysicsHelper.CreateShape(rectangle, (Scalar) rectangle.Width, (Scalar) rectangle.Height);
MassInfo mass = MassInfo.FromPolygon(shape.Vertexes, TangramInformation.TangramMass);
Body body = new Body(state, shape, mass, new Coefficients(TangramInformation.Restitution, TangramInformation.Restitution), new Lifespan());
body.LinearDamping = TangramInformation.DefaultLinearDamping;
body.AngularDamping = TangramInformation.DefaultAngularDamping;
body.Transformation *=
Matrix2x3.FromScale(new Vector2D((Scalar) rectangle.ScaleX, (Scalar) rectangle.ScaleY));
body.IsCollidable = true;
body.Tag = rectangle;
_engine.AddBody(body);
ScaleState scale = new ScaleState();
scale.Scale = rectangle.ScaleX;
scale.Center = new Point(rectangle.Width/2, rectangle.Height/2);
_scaleses[(int)rectangle.Category] = scale;
_elementsContacts[(int) rectangle.Category] = new Dictionary<int, Contact>();
rectangle.InputReceived += PieceReceiveInput;
return body;
}
