Drawing Shape in DebugView

Question

As the title says, I need to draw a shape/polygon in Farseer using debugview. I have this piece of code which converts a Texture to polygon:

//load texture that will represent the tray
        trayTexture = Content.Load<Texture2D>("tray");

        //Create an array to hold the data from the texture
        uint[] data = new uint[trayTexture.Width * trayTexture.Height];

        //Transfer the texture data to the array
        trayTexture.GetData(data);

        //Find the vertices that makes up the outline of the shape in the texture
        Vertices verts = PolygonTools.CreatePolygon(data, trayTexture.Width, false);

        //Since it is a concave polygon, we need to partition it into several smaller convex polygons
        _list = BayazitDecomposer.ConvexPartition(verts);
        Vector2 vertScale = new Vector2(ConvertUnits.ToSimUnits(1));
        foreach (Vertices verti in _list)
        {
            verti.Scale(ref vertScale);
        }

        tray = BodyFactory.CreateCompoundPolygon(MyWorld, _list, 10);

Now in DebugView I guess I have to use "DrawShape" method which requires:

DrawShape(Fixture fixture, Transform xf, Color color)

My question is how can I get the variables needed for this method, namely Fixture and Transform?

Answer 1

Have you tried the official documentation?

The getting started section shows how to create a fixture:

http://farseerphysics.codeplex.com/documentation

Fixture A fixture attaches (fix) the shape to the body so that the centroid of the shape becomes the body’s position. Whenever you move the body, you also move the shape. Once a collision occur to the shape, the force is calculated and applied to the body.

Her is the code to create a World with a single body:

   1:  //Create a World object with zero gravity    
   2:  World world = new World(Vector2.Zero);    
   3:              

   4:  //We create a body object and make it dynamic (movable)    
   5:  Body myBody = world.CreateBody();    
   6:  myBody.BodyType = BodyType.Dynamic;    
   7:   
   8:  //We create a circle shape with a radius of 0.5 meters    
   9:  CircleShape circleShape = new CircleShape(0.5f);    
  10:       
  11:  //We fix the body and shape together using a Fixture object    
  12:  Fixture fixture = myBody.CreateFixture(circleShape);

You can also use the fixture factory

  Fixture fixture = FixtureFactory.CreateCircle(_world, 0.5f, 5, new Vector2(10, 0));

You can probably create a default transform (that doesn't transform anything) using:

Transfrom transform;
transform.SetIdentity();

Note that you can also use the Box2D manuals, since Farseer offers the same features.