public override void DrawPolygon(b2Vec2[] vertices, int vertexCount, b2Color color)
{
if (!_primitiveBatch.IsReady())
{
throw new InvalidOperationException("BeginCustomDraw must be called before drawing anything.");
}
for (int i = 0; i < vertexCount - 1; i++)
{
_primitiveBatch.AddVertex(vertices[i].ToVector2(), color.ToColor(), PrimitiveType.LineList);
_primitiveBatch.AddVertex(vertices[i + 1].ToVector2(), color.ToColor(), PrimitiveType.LineList);
}
_primitiveBatch.AddVertex(vertices[vertexCount - 1].ToVector2(), color.ToColor(), PrimitiveType.LineList);
_primitiveBatch.AddVertex(vertices[0].ToVector2(), color.ToColor(), PrimitiveType.LineList);
}
public override void DrawSolidPolygon(b2Vec2[] vertices, int vertexCount, b2Color color)
{
if (!_primitiveBatch.IsReady())
{
throw new InvalidOperationException("BeginCustomDraw must be called before drawing anything.");
}
if (vertexCount == 2)
{
DrawPolygon(vertices, vertexCount, color);
return;
}
var colorFill = color.ToColor() * 0.5f;
for (int i = 1; i < vertexCount - 1; i++)
{
_primitiveBatch.AddVertex(vertices[0].ToVector2(), colorFill, PrimitiveType.TriangleList);
_primitiveBatch.AddVertex(vertices[i].ToVector2(), colorFill, PrimitiveType.TriangleList);
_primitiveBatch.AddVertex(vertices[i + 1].ToVector2(), colorFill, PrimitiveType.TriangleList);
}
DrawPolygon(vertices, vertexCount, color);
}
public override void DrawCircle(b2Vec2 center, float radius, b2Color color)
{
if (!_primitiveBatch.IsReady())
{
throw new InvalidOperationException("BeginCustomDraw must be called before drawing anything.");
}
const double increment = Math.PI * 2.0 / CircleSegments;
double theta = 0.0;
var col = color.ToColor();
Vector2 centr = center.ToVector2();
for (int i = 0, count = CircleSegments; i < count; i++)
{
Vector2 v1 = centr + radius * new Vector2((float) Math.Cos(theta), (float) Math.Sin(theta));
Vector2 v2 = centr +
radius *
new Vector2((float) Math.Cos(theta + increment), (float) Math.Sin(theta + increment));
_primitiveBatch.AddVertex(ref v1, col, PrimitiveType.LineList);
_primitiveBatch.AddVertex(ref v2, col, PrimitiveType.LineList);
theta += increment;
}
}
public override void DrawSegment(b2Vec2 p1, b2Vec2 p2, b2Color color)
{
if (!_primitiveBatch.IsReady())
{
throw new InvalidOperationException("BeginCustomDraw must be called before drawing anything.");
}
_primitiveBatch.AddVertex(p1.ToVector2(), color.ToColor(), PrimitiveType.LineList);
_primitiveBatch.AddVertex(p2.ToVector2(), color.ToColor(), PrimitiveType.LineList);
}
public override void DrawSolidCircle(b2Vec2 center, float radius, b2Vec2 axis, b2Color color)
{
if (!_primitiveBatch.IsReady())
{
throw new InvalidOperationException("BeginCustomDraw must be called before drawing anything.");
}
const double increment = Math.PI * 2.0 / CircleSegments;
double theta = 0.0;
var colorFill = color.ToColor() * 0.5f;
var centr = center.ToVector2();
Vector2 v0 = center.ToVector2() + radius * new Vector2((float) Math.Cos(theta), (float) Math.Sin(theta));
theta += increment;
for (int i = 1; i < CircleSegments - 1; i++)
{
var v1 = centr + radius * new Vector2((float) Math.Cos(theta), (float) Math.Sin(theta));
var v2 = centr +
radius * new Vector2((float) Math.Cos(theta + increment), (float) Math.Sin(theta + increment));
_primitiveBatch.AddVertex(ref v0, colorFill, PrimitiveType.TriangleList);
_primitiveBatch.AddVertex(ref v1, colorFill, PrimitiveType.TriangleList);
_primitiveBatch.AddVertex(ref v2, colorFill, PrimitiveType.TriangleList);
theta += increment;
}
DrawCircle(center, radius, color);
DrawSegment(center, center + axis * radius, color);
}