//------------------------------------------------------------------------------
private static TPolygon BuildArc(TDoublePoint pt, double a1, double a2, double r)
{
int steps = (int)Math.Max(6, Math.Sqrt(Math.Abs(r)) * Math.Abs(a2 - a1));
TPolygon result = new TPolygon();
result.Capacity = steps;
int n = steps - 1;
double da = (a2 - a1) / n;
double a = a1;
for (int i = 0; i <= n; ++i)
{
double dy = Math.Sin(a) * r;
double dx = Math.Cos(a) * r;
result.Add(new TDoublePoint(pt.X + dx, pt.Y + dy));
a = a + da;
}
return(result);
}
//------------------------------------------------------------------------------
private static TPolygon BuildArc(TDoublePoint pt, double a1, double a2, double r)
{
int steps = (int)Math.Max(6, Math.Sqrt(Math.Abs(r)) * Math.Abs(a2 - a1));
TPolygon result = new TPolygon();
result.Capacity = steps;
int n = steps - 1;
double da = (a2 - a1) / n;
double a = a1;
for (int i = 0; i <= n; ++i)
{
double dy = Math.Sin(a) * r;
double dx = Math.Cos(a) * r;
result.Add(new TDoublePoint(pt.X + dx, pt.Y + dy));
a = a + da;
}
return result;
}
