protected override Polygon GetPolygon()
{
Polygon poly = new Polygon(GetPoints());
if (thickness > 1)
{
List <PolygonPoint> points = GetPoints();
Vector2 center = GetCentroid(points);
float[] angles = { TriangleHelper2D.AngleA(a, b, c), TriangleHelper2D.AngleB(a, b, c), TriangleHelper2D.AngleC(a, b, c) };
int count = points.Count;
for (int i = count; --i >= 0;)
{
PolygonPoint point = points[i];
double vecX = center.X - point.X;
double vecY = center.Y - point.Y;
double invLen = 1d / Math.Sqrt((vecX * vecX) + (vecY * vecY));
vecX = vecX * invLen;
vecY = vecY * invLen;
float ratio = 1 - (angles[i] / 180);
float angleThickness = ratio * thickness;
point.X += vecX * angleThickness;
point.Y += vecY * angleThickness;
}
Polygon hole = new Polygon(points);
poly.AddHole(hole);
}
return(poly);
}
public PTriangle(Vector2 a, float lengthAB, float angleB, uint thickness)
: base(thickness)
{
if (angleB >= 180)
{
throw new ArgumentException("Angle cannot be greater than or equal to 180.");
}
this.position = a;
this.a = a;
this.b = new Vector2(a.X + lengthAB, a.Y);
this.c = b + TriangleHelper2D.RadianToVector(MathUtil.DegreesToRadians(angleB) - MathUtil.PiOverTwo) * lengthAB;
}