public void DrawRope(Rope rope)
{
//var segmentPositions = (from s in rope.PhysicsSegments select s.Position).ToArray();
//var segmentPositions = (from s in rope.PhysicsSegments select s.GetWorldPoint(new Vector2(0, 0.5f))).ToArray();
var segmentPositionsList = (from s in rope.PhysicsSegmentJoints select s.WorldAnchorA).ToList();
segmentPositionsList.Insert(0, rope.AttachedPosition);
segmentPositionsList.Add(rope.AttachedEntity.Position);
var segmentPositions = segmentPositionsList.ToArray();
var triangleCount = (segmentPositions.Length - 1) * 2;
VertexPositionColorTexture[] vpc = new VertexPositionColorTexture[triangleCount * 3];
float u = 0;
for(int i = 0; i < segmentPositions.Length - 1; i++)
{
var p0 = segmentPositions[i + 1];
var p1 = segmentPositions[i];
var d = Vector2.Normalize(p1 - p0);
var n = new Vector2(d.Y, -d.X);
var u0 = u - d.Length() * 0.05f;
var u1 = u + (p1 - p0).Length() + d.Length() * 0.05f;
p0 -= d * 0.05f;
p1 += d * 0.05f;
var t00 = p0 + n * RopeWidth;
var t10 = p1 + n * RopeWidth;
var t01 = p0 - n * RopeWidth;
var t11 = p1 - n * RopeWidth;
vpc[i * 6 + 0].Color = Color.White;
vpc[i * 6 + 0].Position = new Vector3(t11, -1);
vpc[i * 6 + 0].TextureCoordinate = new Vector2(1, u1 / (2f * RopeWidth));
vpc[i * 6 + 1].Color = Color.White;
vpc[i * 6 + 1].Position = new Vector3(t10, -1);
vpc[i * 6 + 1].TextureCoordinate = new Vector2(0, u1 / (2f * RopeWidth));
vpc[i * 6 + 2].Color = Color.White;
vpc[i * 6 + 2].Position = new Vector3(t00, -1);
vpc[i * 6 + 2].TextureCoordinate = new Vector2(0, u0 / (2f * RopeWidth));
vpc[i * 6 + 3].Color = Color.White;
vpc[i * 6 + 3].Position = new Vector3(t01, -1);
vpc[i * 6 + 3].TextureCoordinate = new Vector2(1, u0 / (2f * RopeWidth));
vpc[i * 6 + 4].Color = Color.White;
vpc[i * 6 + 4].Position = new Vector3(t11, -1);
vpc[i * 6 + 4].TextureCoordinate = new Vector2(1, u1 / (2f * RopeWidth));
vpc[i * 6 + 5].Color = Color.White;
vpc[i * 6 + 5].Position = new Vector3(t00, -1);
vpc[i * 6 + 5].TextureCoordinate = new Vector2(0, u0 / (2f * RopeWidth));
u = u1;
}
RopeEffect.World = Matrix.Identity;
RopeEffect.View = Game.Camera.View;
RopeEffect.Projection = Game.Camera.Projection;
RopeEffect.CurrentTechnique.Passes[0].Apply();
GraphicsDevice.SamplerStates[0] = new SamplerState
{
AddressU = TextureAddressMode.Wrap,
AddressV = TextureAddressMode.Wrap
};
GraphicsDevice.DrawUserPrimitives<VertexPositionColorTexture>(PrimitiveType.TriangleList, vpc, 0, triangleCount);
}
