Jan 14, 2013 at 5:06 PM
Edited Jan 14, 2013 at 5:10 PM
I'm trying to define a polygon to be updated by a body bounded by a physical world. Here it goes my attempt:
public Body _body;
public Shape _shape;
_primitiveBatch = new PrimitiveBatch(_game.GraphicsDevice);
_shape = new PolygonShape(_vertices, 1);
Vector2 _position = FarseerPolygon.getCenter(((PolygonShape)_shape).Vertices);
_body = new Body(_world);
_body.Position = _position;
_body.BodyType = BodyType.Dynamic;
_body.Restitution = 0.9f;
_body.Friction = 1f;
The body changes its position but not the shape. Body.CreatePolygon also doesn't work. Any help would really be appreciated because I'm stucked in here... Thank you,
Jan 19, 2013 at 8:09 PM
The shape never changes it position as it is copied over to the fixture, and the vertices of a shape never change anyway, as they are transformed instead.
To draw the vertices the correct place, you need to transform the vertices to world space:
Vector2 tempVertices = new Vector2[Settings.MaxPolygonVertices]
body.GetTransform(out xf); //Contains the transformations
for (int i = 0; i < shape.Vertices.Count;; ++i)
//Apply the transformations to each vertex
tempVertices[i] = MathUtils.Mul(ref xf, poly.Vertices[i]);
//Now we can draw the vertices in the tempVertices array.
.... drawing code ....