Arc2d Get_arc(int i)
{
Arc a = (i == 0) ? arc1 : arc2;
double start_deg = a.AngleStartR * math.MathUtil.Rad2Deg;
double end_deg = a.AngleEndR * math.MathUtil.Rad2Deg;
if (a.PositiveRotation == true)
{
double tmp = start_deg;
start_deg = end_deg;
end_deg = tmp;
}
Arc2d arc = new Arc2d(a.Center, a.Radius, start_deg, end_deg);
// [RMS] code above does not preserve CW/CCW of arcs.
// It would be better to fix that. But for now, just check if
// we preserved start and end points, and if not reverse curves.
if (i == 0 && arc.SampleT(0.0).DistanceSquared(Point1) > math.MathUtil.ZeroTolerance)
{
arc.Reverse();
}
if (i == 1 && arc.SampleT(1.0).DistanceSquared(Point2) > math.MathUtil.ZeroTolerance)
{
arc.Reverse();
}
return(arc);
}
public void DebugPrint()
{
System.Console.WriteLine("biarc fit Pt0 {0} Pt1 {1} Tan0 {2} Tan1 {3}", Point1, Point2, Tangent1, Tangent2);
System.Console.WriteLine(" First: Start {0} End {1} {2}",
(Arc1IsSegment) ? Segment1.P0 : Arc1.SampleT(0),
(Arc1IsSegment) ? Segment1.P1 : Arc1.SampleT(1),
(Arc1IsSegment) ? "segment" : "arc");
System.Console.WriteLine(" Second: Start {0} End {1} {2}",
(Arc2IsSegment) ? Segment2.P0 : Arc2.SampleT(0),
(Arc2IsSegment) ? Segment2.P1 : Arc2.SampleT(1),
(Arc2IsSegment) ? "segment" : "arc");
}
/// <summary>
/// This is a utility function that returns the set of border points, which
/// is useful when we use a roundrect as a UI element and want the border
/// </summary>
public Vector3D[] GetBorderLoop()
{
int corner_v = 0;
for (int k = 0; k < 4; ++k)
{
if (((int)SharpCorners & (1 << k)) != 0)
{
corner_v += 1;
}
else
{
corner_v += CornerSteps;
}
}
float innerW = Width - 2 * Radius;
float innerH = Height - 2 * Radius;
Vector3D[] vertices = new Vector3D[4 + corner_v];
int vi = 0;
for (int i = 0; i < 4; ++i)
{
vertices[vi++] = new Vector3D(signx[i] * Width / 2, 0, signy[i] * Height / 2);
bool sharp = ((int)SharpCorners & (1 << i)) > 0;
Arc2d arc = new Arc2d(new Vector2D(signx[i] * innerW, signy[i] * innerH),
(sharp) ? math.MathUtil.SqrtTwo * Radius : Radius,
startangle[i], endangle[i]);
int use_steps = (sharp) ? 1 : CornerSteps;
for (int k = 0; k < use_steps; ++k)
{
double t = (double)(i + 1) / (double)(use_steps + 1);
Vector2D pos = arc.SampleT(t);
vertices[vi++] = new Vector3D(pos.x, 0, pos.y);
}
}
return(vertices);
}