/// <summary>
/// Returns the lines that go to make this up based on the set of points
/// provided which are assumed to be on the line.
/// </summary>
/// <param name="PtsOnLine">The points defining how the line is to be split.</param>
/// <param name="LineSet">The line set to recieve the result.</param>
public override void GetSubLines(List <C2DPoint> PtsOnLine, List <C2DLineBase> LineSet)
{
// if there are no points on the line to split on then add a copy of this and return.
int usPointsCount = PtsOnLine.Count;
if (usPointsCount == 0)
{
LineSet.Add(new C2DArc(this));
return;
}
else
{
// Make a copy of the points for sorting.
C2DPointSet TempPts = new C2DPointSet();
TempPts.MakeCopy(PtsOnLine);
if (usPointsCount > 1) // They need sorting
{
// Make a line from the mid point of my line to the start
C2DLine CenToStart = new C2DLine(Line.GetMidPoint(), Line.point);
// Now sort the points according to the order in which they will be encountered
if (ArcOnRight)
{
TempPts.SortByAngleToLeft(CenToStart);
}
else
{
TempPts.SortByAngleToRight(CenToStart);
}
}
C2DPoint ptCentre = new C2DPoint(GetCircleCentre());
// Add the line from the start of this to the first.
C2DLine NewLine = new C2DLine(Line.point, TempPts[0]);
LineSet.Add(new C2DArc(NewLine, Radius,
NewLine.IsOnRight(ptCentre), ArcOnRight));
// Add all the sub lines.
for (int i = 1; i < usPointsCount; i++)
{
NewLine.Set(TempPts[i - 1], TempPts[i]);
LineSet.Add(new C2DArc(NewLine, Radius,
NewLine.IsOnRight(ptCentre), ArcOnRight));
}
// Add the line from the last point on this to the end of this.
NewLine.Set(TempPts[TempPts.Count - 1], Line.GetPointTo());
LineSet.Add(new C2DArc(NewLine, Radius,
NewLine.IsOnRight(ptCentre), ArcOnRight));
}
}
/// <summary>
/// Gets the point half way along the curve as a new object.
/// </summary>
public C2DPoint GetMidPoint()
{
Debug.Assert(IsValid(), "Invalid arc defined, cannot calculate midpoint");
// Make a line from the circle centre to the middle of the line
C2DPoint ptCentre = new C2DPoint(GetCircleCentre());
C2DPoint ptLineCentre = new C2DPoint(Line.GetMidPoint());
C2DLine CenToMid = new C2DLine(ptCentre, ptLineCentre);
if (CenToMid.vector.i == 0 && CenToMid.vector.j == 0)
{
// The centre of the line is the same as the centre of the circle
// i.e. this arc is 180 degrees or half a circle.
CenToMid.Set(Line);
CenToMid.SetPointFrom(ptLineCentre);
if (ArcOnRight)
{
CenToMid.vector.TurnRight();
}
else
{
CenToMid.vector.TurnLeft();
}
}
else
{
// extend it to the edge of the arc
CenToMid.SetLength(Radius);
// if the arc on the opposite side to the centre then reverse the line.
if (ArcOnRight == CentreOnRight)
{
CenToMid.vector.Reverse();
}
}
return(CenToMid.GetPointTo());
}
/// <summary>
/// Returns the lines that go to make this up based on the set of points
/// provided which are assumed to be on the line.
/// </summary>
/// <param name="PtsOnLine">The points defining how the line is to be split.</param>
/// <param name="LineSet">The line set to recieve the result.</param>
public override void GetSubLines(List<C2DPoint> PtsOnLine, List<C2DLineBase> LineSet)
{
// if there are no points on the line to split on then add a copy of this and return.
int usPointsCount = PtsOnLine.Count;
if (usPointsCount == 0 )
{
LineSet.Add(new C2DArc(this));
return;
}
else
{
// Make a copy of the points for sorting.
C2DPointSet TempPts = new C2DPointSet();
TempPts.MakeCopy(PtsOnLine);
if (usPointsCount > 1) // They need sorting
{
// Make a line from the mid point of my line to the start
C2DLine CenToStart = new C2DLine( Line.GetMidPoint(), Line.point );
// Now sort the points according to the order in which they will be encountered
if (ArcOnRight)
TempPts.SortByAngleToLeft( CenToStart );
else
TempPts.SortByAngleToRight( CenToStart );
}
C2DPoint ptCentre = new C2DPoint(GetCircleCentre());
// Add the line from the start of this to the first.
C2DLine NewLine = new C2DLine( Line.point, TempPts[0] );
LineSet.Add(new C2DArc(NewLine, Radius,
NewLine.IsOnRight(ptCentre), ArcOnRight));
// Add all the sub lines.
for (int i = 1; i < usPointsCount; i++)
{
NewLine.Set(TempPts[i - 1], TempPts[i]);
LineSet.Add(new C2DArc(NewLine, Radius,
NewLine.IsOnRight(ptCentre), ArcOnRight));
}
// Add the line from the last point on this to the end of this.
NewLine.Set(TempPts[TempPts.Count - 1], Line.GetPointTo());
LineSet.Add(new C2DArc(NewLine, Radius,
NewLine.IsOnRight(ptCentre), ArcOnRight));
}
}
/// <summary>
/// Gets the point half way along the curve as a new object.
/// </summary>
public C2DPoint GetMidPoint()
{
Debug.Assert(IsValid(), "Invalid arc defined, cannot calculate midpoint");
// Make a line from the circle centre to the middle of the line
C2DPoint ptCentre = new C2DPoint(GetCircleCentre());
C2DPoint ptLineCentre = new C2DPoint(Line.GetMidPoint());
C2DLine CenToMid = new C2DLine(ptCentre, ptLineCentre);
if ( CenToMid.vector.i == 0 && CenToMid.vector.j == 0)
{
// The centre of the line is the same as the centre of the circle
// i.e. this arc is 180 degrees or half a circle.
CenToMid.Set(Line);
CenToMid.SetPointFrom( ptLineCentre );
if ( ArcOnRight )
CenToMid.vector.TurnRight();
else
CenToMid.vector.TurnLeft();
}
else
{
// extend it to the edge of the arc
CenToMid.SetLength( Radius );
// if the arc on the opposite side to the centre then reverse the line.
if ( ArcOnRight == CentreOnRight)
{
CenToMid.vector.Reverse();
}
}
return CenToMid.GetPointTo();
}
