public static IPrimitive PrimitiveFromPointAndVertex(Point lastPoint, Vertex nextVertex)
{
if (nextVertex.IsLine)
{
return(new PrimitiveLine(lastPoint, nextVertex.Location));
}
else
{
return(PrimitiveEllipse.ArcFromPointsAndIncludedAngle(lastPoint, nextVertex.Location, nextVertex.IncludedAngle, nextVertex.Direction));
}
}
public static IPrimitive PrimitiveFromVertices(Vertex last, Vertex next)
{
if (last.IsLine)
{
return(new PrimitiveLine(last.Location, next.Location));
}
else
{
return(PrimitiveEllipse.ArcFromPointsAndIncludedAngle(last.Location, next.Location, last.IncludedAngle, last.Direction));
}
}
public void ArcsFromPointsAndRadiusTest1()
{
// given the points (0, 1) and (0, -1) and an included angle of 90 degrees, the possible centers for the arcs
// here are (1, 0) and (-1, 0) and a radius of sqrt(2)
var p1 = new Point(0, 1, 0);
var p2 = new Point(0, -1, 0);
var includedAngle = 90.0;
var sqrt2 = Math.Sqrt(2.0);
var arc1 = PrimitiveEllipse.ArcFromPointsAndIncludedAngle(p1, p2, includedAngle, VertexDirection.Clockwise);
AssertClose(new Point(-1, 0, 0), arc1.Center);
AssertClose(sqrt2, arc1.MajorAxis.Length);
AssertClose(315.0, arc1.StartAngle);
AssertClose(45.0, arc1.EndAngle);
var arc2 = PrimitiveEllipse.ArcFromPointsAndIncludedAngle(p1, p2, includedAngle, VertexDirection.CounterClockwise);
AssertClose(new Point(1, 0, 0), arc2.Center);
AssertClose(sqrt2, arc2.MajorAxis.Length);
AssertClose(135.0, arc2.StartAngle);
AssertClose(225.0, arc2.EndAngle);
}
