private void PrepareDraw(IRenderCanvas renderCanvas, Body body)
{
renderCanvas.StrokeThickness = 1f;
if (body.IsStatic)
{
renderCanvas.StrokeColor = Color.Yellow;
renderCanvas.FillColor = Color.FromArgb(128, Color.YellowGreen);
}
else if (body.BodyType == BodyType.Kinematic)
{
renderCanvas.StrokeColor = Color.White;
renderCanvas.FillColor = Color.FromArgb(128, Color.White);
}
else if (body.Awake)
{
renderCanvas.StrokeColor = Color.Red;
renderCanvas.FillColor = Color.FromArgb(128, Color.OrangeRed);
}
else
{
renderCanvas.StrokeColor = Color.Green;
renderCanvas.FillColor = Color.FromArgb(128, Color.SeaGreen);
}
}
private void DrawBodyFixtures(IRenderCanvas renderCanvas, List <Fixture> fixtureList)
{
Transform transform;
for (var idx = 0; idx < fixtureList.Count; ++idx)
{
var fixture = fixtureList[idx];
fixture.Body.GetTransform(out transform);
DrawShape(renderCanvas, fixture.Shape, transform);
}
}
private void DrawShape(IRenderCanvas renderCanvas, Shape shape, Transform xf)
{
switch (shape.ShapeType)
{
case ShapeType.Circle:
{
CircleShape circle = (CircleShape)shape;
Vector2 center = MathUtils.Mul(ref xf, circle.Position);
float radius = circle.Radius;
renderCanvas.DrawCircle(center, radius);
}
break;
case ShapeType.Polygon:
{
PolygonShape poly = (PolygonShape)shape;
int vertexCount = poly.Vertices.Count;
Debug.Assert(vertexCount <= Settings.MaxPolygonVertices);
for (int i = 0; i < vertexCount; ++i)
{
tempVertices[i] = MathUtils.Mul(ref xf, poly.Vertices[i]);
}
renderCanvas.DrawPolygon(tempVertices, vertexCount);
}
break;
case ShapeType.Edge:
{
EdgeShape edge = (EdgeShape)shape;
Vector2 v1 = MathUtils.Mul(ref xf, edge.Vertex1);
Vector2 v2 = MathUtils.Mul(ref xf, edge.Vertex2);
renderCanvas.DrawLine(v1, v2);
}
break;
case ShapeType.Chain:
{
ChainShape chain = (ChainShape)shape;
for (int i = 0; i < chain.Vertices.Count - 1; ++i)
{
Vector2 v1 = MathUtils.Mul(ref xf, chain.Vertices[i]);
Vector2 v2 = MathUtils.Mul(ref xf, chain.Vertices[i + 1]);
renderCanvas.DrawLine(v1, v2);
}
}
break;
}
}
public virtual void Render(IRenderCanvas renderCanvas)
{
renderCanvas.Clear(Color.Black);
renderCanvas.Scale = MathHelper.Min((renderCanvas.Size.Width - 10) / Size.X, (renderCanvas.Size.Height - 10) / Size.Y);
renderCanvas.Center = Vector2.Zero;
for (var idx = 0; idx < World.BodyList.Count; ++idx)
{
var body = World.BodyList[idx];
PrepareDraw(renderCanvas, body);
DrawBodyFixtures(renderCanvas, body.FixtureList);
}
}
