Point2D?IntersectWith(LineSegment2D other)
{
var d0 = Delta;
var d1 = other.Delta;
if (!d0.IsParallelTo(d1))
{
var e = other.StartPoint - StartPoint;
double s = e.CrossProduct(d1) / d0.CrossProduct(d1);
return(StartPoint + d0 * s);
}
return(null);
}
public override IEnumerable <int> Draw(Graphics g, Pen pen, GraphicsPath path)
{
GraphicsPath fill = new GraphicsPath();
for (int i = 0; i < SegmentCount; i++)
{
var curve = GetSegmentAt(i);
var ver = Vertexs[i];
if (ver.StartWidth == 0 && ver.EndWidth == 0)
{
curve.DrawTo(g, path);
}
else
{
var w1 = ver.StartWidth / 2;
var w2 = ver.EndWidth / 2;
var cpath = new GraphicsPath();
if (curve is LineSegment2D)
{
var line = curve as LineSegment2D;
var vec = line.EndPoint - line.StartPoint;
vec = vec.UnitVector.RotateBy(Angle.Degree90);
var pts =
new PointF[]
{
line.StartPoint + vec * w1,
line.EndPoint + vec * w2,
line.EndPoint - vec * w2,
line.StartPoint - vec * w1
};
cpath.AddLines(pts);
cpath.CloseFigure();
}
else
{
var arc = curve as CircleArc2D;
var vec1 = new Vector2D(w1, arc.StartAngle);
var pt = arc.GetPointAtParam(arc.EndParam / 2);
var vec2 = (pt - arc.Center).UnitVector * (w1 + w2) / 2;
var vec3 = new Vector2D(w2, arc.EndAngle);
var pts =
new Point2D[]
{
arc.StartPoint + vec1,
pt + vec2,
arc.EndPoint + vec3,
arc.EndPoint - vec3,
pt - vec2,
arc.StartPoint - vec1
};
var arc1 = new CircleArc2D(pts[0], pts[1], pts[2]);
var line1 = new LineSegment2D(pts[2], pts[3]);
var arc2 = new CircleArc2D(pts[3], pts[4], pts[5]);
var line2 = new LineSegment2D(pts[5], pts[0]);
arc1.DrawTo(g, cpath);
line1.DrawTo(g, cpath);
arc2.DrawTo(g, cpath);
line2.DrawTo(g, cpath);
}
fill.AddPath(cpath, false);
path.AddPath(cpath, false);
path.StartFigure();
}
}
yield return(0);
g.FillPath(pen.Brush, fill);
yield break;
}
/// <summary>
///
/// </summary>
/// <param name="line"></param>
/// <returns></returns>
public static Matrix2D Mirror(LineSegment2D line)
{
return(Matrix2D.Mirror(line.StartPoint, line.EndPoint));
}
