public RoundCappedLine(Point point1, Point point2, double radius) : this()
{
Vector2 vector = new Vector2(point2 - new Vector2(point1));
Vector2 normVect = vector;
normVect = normVect.Normalized;
Point pt1a = point1 + radius * new Vector2(normVect.Y, -normVect.X);
Point pt2a = pt1a + vector;
Point pt1b = point1 + radius * new Vector2(-normVect.Y, normVect.X);
Point pt2b = pt1b + vector;
lineSegment1 = new LineSegment2(pt1a, pt2a);
arcSegment1 = new ArcSegment2(point2, radius, pt2a, pt2b);
lineSegment2 = new LineSegment2(pt2b, pt1b);
arcSegment2 = new ArcSegment2(point1, radius, pt1b, pt1a);
}
public RoundCappedPath(Point point1, Point point2, double radius1, double radius2)
: this()
{
Point c0 = point1;
Point c1 = point2;
double r0 = radius1;
double r1 = radius2;
// Get vector from c1 to c0
Vector2 vCenters = new Vector2(c0) - new Vector2(c1);
// Get length and normalized version
double d = vCenters.Length;
vCenters = vCenters.Normalized;
// Create focal point F extending from c0
double e = d * r0 / (r1 - r0);
Point F = c0 + e * vCenters;
// Find angle and length of right-triangle legs
double alpha = 180 * Math.Asin(r0 / e) / Math.PI;
double leg0 = Math.Sqrt(e * e - r0 * r0);
double leg1 = Math.Sqrt((e + d) * (e + d) - r1 * r1);
// Vectors of tangent lines
Vector2 vRight = -vCenters.Rotate(alpha);
Vector2 vLeft = -vCenters.Rotate(-alpha);
// Find tangent points
Point t0R = F + leg0 * vRight;
Point t0L = F + leg0 * vLeft;
Point t1R = F + leg1 * vRight;
Point t1L = F + leg1 * vLeft;
lineSegment1 = new LineSegment2(t1R, t0R);
arcSegment1 = new ArcSegment2(c0, r0, t0R, t0L);
lineSegment2 = new LineSegment2(t0L, t1L);
arcSegment2 = new ArcSegment2(c1, r1, t1L, t1R);
}
