public override void LoadContent()
{
base.LoadContent();
World.Gravity = new Vector2(0, 9.82f);
_border = new Border(World, this, ScreenManager.GraphicsDevice.Viewport);
/* Bridge */
//We make a path using 2 points.
Path bridgePath = new Path();
bridgePath.Add(new Vector2(-15, 5));
bridgePath.Add(new Vector2(15, 5));
bridgePath.Closed = false;
Vertices box = PolygonTools.CreateRectangle(0.125f, 0.5f);
PolygonShape shape = new PolygonShape(box, 20);
_bridgeBodies = PathManager.EvenlyDistributeShapesAlongPath(World, bridgePath, shape,
BodyType.Dynamic, 29);
_bridgeBox =
new Sprite(ScreenManager.Assets.TextureFromShape(shape, MaterialType.Dots, Color.SandyBrown, 1f));
//Attach the first and last fixtures to the world
JointFactory.CreateFixedRevoluteJoint(World, _bridgeBodies[0], new Vector2(0f, -0.5f),
_bridgeBodies[0].Position);
JointFactory.CreateFixedRevoluteJoint(World, _bridgeBodies[_bridgeBodies.Count - 1], new Vector2(0, 0.5f),
_bridgeBodies[_bridgeBodies.Count - 1].Position);
PathManager.AttachBodiesWithRevoluteJoint(World, _bridgeBodies, new Vector2(0f, -0.5f),
new Vector2(0f, 0.5f),
false, true);
/* Soft body */
//We make a rectangular path.
Path rectanglePath = new Path();
rectanglePath.Add(new Vector2(-6, -11));
rectanglePath.Add(new Vector2(-6, 1));
rectanglePath.Add(new Vector2(6, 1));
rectanglePath.Add(new Vector2(6, -11));
rectanglePath.Closed = true;
//Creating two shapes. A circle to form the circle and a rectangle to stabilize the soft body.
List <Shape> shapes = new List <Shape>(2);
shapes.Add(new PolygonShape(PolygonTools.CreateRectangle(0.5f, 0.5f, new Vector2(-0.1f, 0f), 0f), 1f));
shapes.Add(new CircleShape(0.5f, 1f));
//We distribute the shapes in the rectangular path.
_softBodies = PathManager.EvenlyDistributeShapesAlongPath(World, rectanglePath, shapes,
BodyType.Dynamic, 30);
_softBodyBox =
new Sprite(ScreenManager.Assets.TextureFromShape(shapes[0], MaterialType.Blank, Color.Silver * 0.8f, 1f));
_softBodyBox.Origin += new Vector2(ConvertUnits.ToDisplayUnits(0.1f), 0f);
_softBodyCircle =
new Sprite(ScreenManager.Assets.TextureFromShape(shapes[1], MaterialType.Waves, Color.Silver, 1f));
//Attach the bodies together with revolute joints. The rectangular form will converge to a circular form.
PathManager.AttachBodiesWithRevoluteJoint(World, _softBodies, new Vector2(0f, -0.5f), new Vector2(0f, 0.5f),
true, true);
}
public Texture2D TextureFromVertices(Vertices vertices, MaterialType type, Color color, float materialScale)
{
// copy vertices
Vertices verts = new Vertices(vertices);
// scale to display units (i.e. pixels) for rendering to texture
Vector2 scale = ConvertUnits.ToDisplayUnits(Vector2.One);
verts.Scale(ref scale);
// translate the boundingbox center to the texture center
// because we use an orthographic projection for rendering later
AABB vertsBounds = verts.GetCollisionBox();
verts.Translate(-vertsBounds.Center);
List <Vertices> decomposedVerts;
if (!verts.IsConvex())
{
decomposedVerts = EarclipDecomposer.ConvexPartition(verts);
}
else
{
decomposedVerts = new List <Vertices>();
decomposedVerts.Add(verts);
}
List <VertexPositionColorTexture[]> verticesFill =
new List <VertexPositionColorTexture[]>(decomposedVerts.Count);
materialScale /= _materials[type].Width;
for (int i = 0; i < decomposedVerts.Count; ++i)
{
verticesFill.Add(new VertexPositionColorTexture[3 * (decomposedVerts[i].Count - 2)]);
for (int j = 0; j < decomposedVerts[i].Count - 2; ++j)
{
// fill vertices
verticesFill[i][3 * j].Position = new Vector3(decomposedVerts[i][0], 0f);
verticesFill[i][3 * j + 1].Position = new Vector3(decomposedVerts[i].NextVertex(j), 0f);
verticesFill[i][3 * j + 2].Position = new Vector3(decomposedVerts[i].NextVertex(j + 1), 0f);
verticesFill[i][3 * j].TextureCoordinate = decomposedVerts[i][0] * materialScale;
verticesFill[i][3 * j + 1].TextureCoordinate = decomposedVerts[i].NextVertex(j) * materialScale;
verticesFill[i][3 * j + 2].TextureCoordinate = decomposedVerts[i].NextVertex(j + 1) * materialScale;
verticesFill[i][3 * j].Color =
verticesFill[i][3 * j + 1].Color = verticesFill[i][3 * j + 2].Color = color;
}
}
// calculate outline
VertexPositionColor[] verticesOutline = new VertexPositionColor[2 * verts.Count];
for (int i = 0; i < verts.Count; ++i)
{
verticesOutline[2 * i].Position = new Vector3(verts[i], 0f);
verticesOutline[2 * i + 1].Position = new Vector3(verts.NextVertex(i), 0f);
verticesOutline[2 * i].Color = verticesOutline[2 * i + 1].Color = Color.Black;
}
Vector2 vertsSize = new Vector2(vertsBounds.UpperBound.X - vertsBounds.LowerBound.X,
vertsBounds.UpperBound.Y - vertsBounds.LowerBound.Y);
return(RenderTexture((int)vertsSize.X, (int)vertsSize.Y,
_materials[type], verticesFill, verticesOutline));
}
