static public IEnumerable <Vector2> GetPoints(this Triangle2 item)
{
yield return(item.v0);
yield return(item.v1);
yield return(item.v2);
}
static public IEnumerable <Triangle2> SplitAlongEdge20ByPercent(this Triangle2 item, float percent)
{
Vector2 vertex = item.GetEdge20().GetPointOnByPercent(percent);
yield return(new Triangle2(item.v0, item.v1, vertex));
yield return(new Triangle2(vertex, item.v1, item.v2));
}
static public IEnumerable <Triangle2> Fantize(this Triangle2 item, Vector2 point)
{
yield return(new Triangle2(item.v0, item.v1, point));
yield return(new Triangle2(item.v1, item.v2, point));
yield return(new Triangle2(item.v2, item.v0, point));
}
static public Triangle3 InflateTriangle(this PlaneSpace item, Triangle2 triangle)
{
return(new Triangle3(
item.InflatePoint(triangle.v0),
item.InflatePoint(triangle.v1),
item.InflatePoint(triangle.v2)
));
}
public PolygonTriangle(Triangle2 t)
{
triangle = t;
f1 = triangle.GetEdge01().GetFace();
f2 = triangle.GetEdge12().GetFace();
f3 = triangle.GetEdge20().GetFace();
}
static public IEnumerable <Triangle2> RecursiveFantizeAtCenterByArea(this Triangle2 item, float min_area, int max_recursions)
{
if (item.GetArea() > min_area && max_recursions >= 1)
{
return(item.FantizeAtCenter()
.Convert(t => t.RecursiveFantizeAtCenterByArea(min_area, max_recursions - 1))
.Flatten());
}
return(item.WrapAsEnumerable());
}
static public bool TryCreateTriangle(this Face item, Face face, out Triangle2 triangle, out Face missing)
{
if (item.TryCreateTriangle(face, out triangle))
{
missing = FaceExtensions.CreatePoints(face.v1, item.v0);
return(true);
}
missing = default(Face);
return(false);
}
static public IEnumerable <Triangle2> RecursiveSplitSpiralAlongEdgeByArea(this Triangle2 item, float p, float dp, float min_area, int max_recursions)
{
if (item.GetArea() > min_area && max_recursions >= 1)
{
return(item.SplitAlongEdgeByPercent(p)
.Convert(t => t.RecursiveSplitSpiralAlongEdgeByArea(p + dp, dp, min_area, max_recursions - 1))
.Flatten());
}
return(item.WrapAsEnumerable());
}
static public bool TryCreateTriangle(this Face item, Face face, out Triangle2 triangle)
{
if (item.v1 == face.v0)
{
if (item.IsInside(face.v1))
{
triangle = new Triangle2(item.v0, face.v0, face.v1);
return(true);
}
}
triangle = default(Triangle2);
return(false);
}
static public bool IsIntersecting(this Plane2 item, Triangle2 triangle, out LineSegment2 output)
{
Vector2 v0;
Vector2 v1;
if (triangle.GetEdges()
.TryConvert((LineSegment2 e, out Vector2 v) => item.IsIntersecting(e, out v))
.PartOut(out v0, out v1) == 2)
{
output = new LineSegment2(v0, v1);
return(true);
}
output = default(LineSegment2);
return(false);
}
static public IEnumerable <Triangle2> SplitAlongEdgeByPercent(this Triangle2 item, float percent)
{
percent = percent.GetLooped(3.0f);
if (percent < 1.0f)
{
return(item.SplitAlongEdge01ByPercent(percent));
}
if (percent < 2.0f)
{
return(item.SplitAlongEdge12ByPercent(percent - 1.0f));
}
return(item.SplitAlongEdge20ByPercent(percent - 2.0f));
}
static public Vector2 GetPointOnEdgeByPercent(this Triangle2 item, float percent)
{
percent = percent.GetLooped(3.0f);
if (percent < 1.0f)
{
return(item.GetEdge01().GetPointOnByPercent(percent));
}
if (percent < 2.0f)
{
return(item.GetEdge12().GetPointOnByPercent(percent - 1.0f));
}
return(item.GetEdge20().GetPointOnByPercent(percent - 2.0f));
}
static public IEnumerable <Triangle2> FantizeAtCenter(this Triangle2 item)
{
return(item.Fantize(item.GetCenter()));
}
static public Vector2 GetCenter(this Triangle2 item)
{
return(item.GetPoints().Average());
}
static public void DrawTriangle(Triangle2 triangle)
{
Gizmos.DrawLine(triangle.v0, triangle.v1);
Gizmos.DrawLine(triangle.v1, triangle.v2);
Gizmos.DrawLine(triangle.v2, triangle.v0);
}
static public IEnumerable <LineSegment2> GetEdges(this Triangle2 item)
{
return(item.GetPoints().CloseLoop().Connect());
}
static public LineSegment2 GetEdge20(this Triangle2 item)
{
return(new LineSegment2(item.v2, item.v0));
}
static public LineSegment2 GetEdge12(this Triangle2 item)
{
return(new LineSegment2(item.v1, item.v2));
}
static public float GetArea(this Triangle2 item)
{
return(item.GetPoints().GetLoopArea());
}
static public Rect GetRect(this Triangle2 item)
{
return(RectExtensions.CreatePoints(item.GetPoints()));
}
static public void AddTriangle(this MeshBuilder item, Triangle2 triangle)
{
item.AddTriangle(triangle.v0, triangle.v1, triangle.v2);
}
static public Triangle2 GetReversedWinding(this Triangle2 item)
{
return(new Triangle2(item.v2, item.v1, item.v0));
}
static public LineSegment2 GetEdge01(this Triangle2 item)
{
return(new LineSegment2(item.v0, item.v1));
}
static public Bounds GetBounds(this Triangle2 item)
{
return(BoundsExtensions.CreateWithPoints(item.GetPoints().GetSpacar()));
}