/// <summary>
/// Gets the parameters required to draw an arc.
/// </summary>
private void GetArcParameters(C2DArc Arc, C2DRect Rect, ref int nStartAngle, ref int nSweepAngle)
{
C2DPoint Centre = Arc.GetCircleCentre();
Rect.Set(Centre.x - Arc.Radius, Centre.y + Arc.Radius,
Centre.x + Arc.Radius, Centre.y - Arc.Radius);
ScaleAndOffSet(Rect.TopLeft);
ScaleAndOffSet(Rect.BottomRight);
ScaleAndOffSet(Centre); // CR 19-1-09
C2DPoint bottomRightTemp = new C2DPoint(Rect.BottomRight); // to make valid // CR 11-3-09
Rect.BottomRight.Set(Rect.TopLeft); // to make valid // CR 11-3-09
Rect.ExpandToInclude(bottomRightTemp); // to make valid // CR 11-3-09
C2DPoint pt1 = Arc.Line.GetPointFrom();
C2DPoint pt2 = Arc.Line.GetPointTo();
this.ScaleAndOffSet(pt1);
this.ScaleAndOffSet(pt2);
C2DVector vec1 = new C2DVector(Centre, pt1);
C2DVector vec2 = new C2DVector(Centre, pt2);
C2DVector vecx = new C2DVector(100, 0); // x - axis
double dStartAngle = vecx.AngleToLeft(vec1) * Constants.conDegreesPerRadian;
double dSweepAngle = 0;
bool bAlreadyFlipped = Scale.x * Scale.y < 0;
if (Arc.ArcOnRight ^ bAlreadyFlipped)
{
dSweepAngle = vec1.AngleToLeft(vec2) * Constants.conDegreesPerRadian;
}
else
{
dSweepAngle = -vec1.AngleToRight(vec2) * Constants.conDegreesPerRadian;
}
nStartAngle = (int)dStartAngle;
if (nStartAngle == 360)
{
nStartAngle = 0;
}
nSweepAngle = (int)dSweepAngle;
}
/// <summary>
/// True if this crosses a curved line.
/// </summary>
/// <param name="Other">The other arc.</param>
/// <param name="IntersectionPts">The interection point list to recieve the result.</param>
public bool Crosses(C2DArc Other, List <C2DPoint> IntersectionPts)
{
C2DCircle TestCircleThis = new C2DCircle(GetCircleCentre(), Radius);
C2DCircle TestCircleOther = new C2DCircle(Other.GetCircleCentre(), Other.Radius);
List <C2DPoint> IntPtsTemp = new List <C2DPoint>();
if (TestCircleThis.Crosses(TestCircleOther, IntPtsTemp))
{
for (int i = IntPtsTemp.Count - 1; i >= 0; i--)
{
if ((Line.IsOnRight(IntPtsTemp[i]) ^ ArcOnRight) ||
Other.Line.IsOnRight(IntPtsTemp[i]) ^ Other.ArcOnRight ||
IntPtsTemp[i].PointEqualTo(Line.point) ||
IntPtsTemp[i].PointEqualTo(Line.GetPointTo()) ||
IntPtsTemp[i].PointEqualTo(Other.GetPointFrom()) ||
IntPtsTemp[i].PointEqualTo(Other.GetPointTo()))
{
IntPtsTemp.RemoveAt(i);
}
}
if (IntPtsTemp.Count == 0)
{
return(false);
}
else
{
IntersectionPts.InsertRange(0, IntPtsTemp);
// IntPtsTemp.CopyTo( IntersectionPts );
// (*IntersectionPts) << IntPtsTemp;
return(true);
}
}
else
{
return(false);
}
}
/// <summary>
/// The distance between this and another arc.
/// </summary>
/// <param name="Other">The test point.</param>
/// <param name="ptOnThis">The closest point on this to the other as a returned value.</param>
/// <param name="ptOnOther">The closest point on the other to this as a returned value.</param>
public double Distance(C2DArc Other, C2DPoint ptOnThis, C2DPoint ptOnOther)
{
List <C2DPoint> IntPts1 = new List <C2DPoint>();
List <C2DPoint> IntPts2 = new List <C2DPoint>();
C2DPoint ptThisCen = new C2DPoint(GetCircleCentre());
C2DPoint ptOtherCen = new C2DPoint(Other.GetCircleCentre());
C2DCircle CircleThis = new C2DCircle(ptThisCen, Radius);
C2DCircle CircleOther = new C2DCircle(ptOtherCen, Other.Radius);
if (CircleThis.Crosses(CircleOther, IntPts1))
{
for (int i = 0; i < IntPts1.Count; i++)
{
if ((Line.IsOnRight(IntPts1[i]) == ArcOnRight) &&
(Other.Line.IsOnRight(IntPts1[i]) == Other.ArcOnRight))
{
ptOnThis.Set(IntPts1[i]);
ptOnOther.Set(IntPts1[i]);
return(0);
}
}
IntPts1.Clear();
}
C2DLine LineCenToOther = new C2DLine();
LineCenToOther.point = new C2DPoint(ptThisCen);
LineCenToOther.vector = new C2DVector(ptThisCen, ptOtherCen);
LineCenToOther.GrowFromCentre(Math.Max(Radius, Other.Radius) * 10);
double dMinDist = 1.7E308;
double dDist = 0;
if (Crosses(LineCenToOther, IntPts1) && Other.Crosses(LineCenToOther, IntPts2))
{
for (int i = 0; i < IntPts1.Count; i++)
{
for (int j = 0; j < IntPts2.Count; j++)
{
dDist = IntPts1[i].Distance(IntPts2[j]);
if (dDist < dMinDist)
{
ptOnThis.Set(IntPts1[i]);
ptOnOther.Set(IntPts2[j]);
dMinDist = dDist;
}
}
}
}
C2DPoint ptOnThisTemp = new C2DPoint();
dDist = Distance(Other.GetPointFrom(), ptOnThisTemp);
if (dDist < dMinDist)
{
ptOnThis.Set(ptOnThisTemp);
ptOnOther.Set(Other.GetPointFrom());
dMinDist = dDist;
}
dDist = Distance(Other.GetPointTo(), ptOnThisTemp);
if (dDist < dMinDist)
{
ptOnThis.Set(ptOnThisTemp);
ptOnOther.Set(Other.GetPointTo());
dMinDist = dDist;
}
C2DPoint ptOnOtherTemp = new C2DPoint();
dDist = Other.Distance(GetPointFrom(), ptOnOtherTemp);
if (dDist < dMinDist)
{
ptOnThis.Set(GetPointFrom());
ptOnOther.Set(ptOnOtherTemp);
dMinDist = dDist;
}
dDist = Other.Distance(GetPointTo(), ptOnOtherTemp);
if (dDist < dMinDist)
{
ptOnThis.Set(GetPointTo());
ptOnOther.Set(ptOnOtherTemp);
dMinDist = dDist;
}
return(dMinDist);
}
/// <summary>
/// Gets the parameters required to draw an arc.
/// </summary>
private void GetArcParameters(C2DArc Arc, C2DRect Rect, ref int nStartAngle, ref int nSweepAngle)
{
C2DPoint Centre = Arc.GetCircleCentre();
Rect.Set(Centre.x - Arc.Radius, Centre.y + Arc.Radius,
Centre.x + Arc.Radius, Centre.y - Arc.Radius);
ScaleAndOffSet(Rect.TopLeft);
ScaleAndOffSet(Rect.BottomRight);
ScaleAndOffSet(Centre); // CR 19-1-09
C2DPoint bottomRightTemp = new C2DPoint(Rect.BottomRight); // to make valid // CR 11-3-09
Rect.BottomRight.Set(Rect.TopLeft); // to make valid // CR 11-3-09
Rect.ExpandToInclude(bottomRightTemp); // to make valid // CR 11-3-09
C2DPoint pt1 = Arc.Line.GetPointFrom();
C2DPoint pt2 = Arc.Line.GetPointTo();
this.ScaleAndOffSet(pt1);
this.ScaleAndOffSet(pt2);
C2DVector vec1 = new C2DVector(Centre, pt1);
C2DVector vec2 = new C2DVector(Centre, pt2);
C2DVector vecx = new C2DVector(100, 0); // x - axis
double dStartAngle = vecx.AngleToLeft(vec1) * Constants.conDegreesPerRadian;
double dSweepAngle = 0;
bool bAlreadyFlipped = Scale.x * Scale.y < 0;
if (Arc.ArcOnRight ^ bAlreadyFlipped)
dSweepAngle = vec1.AngleToLeft(vec2) * Constants.conDegreesPerRadian;
else
dSweepAngle = -vec1.AngleToRight(vec2) * Constants.conDegreesPerRadian;
nStartAngle = (int)dStartAngle;
if (nStartAngle == 360)
nStartAngle = 0;
nSweepAngle = (int)dSweepAngle;
}
/// <summary>
/// The distance between this and another arc.
/// </summary>
/// <param name="Other">The test point.</param>
/// <param name="ptOnThis">The closest point on this to the other as a returned value.</param>
/// <param name="ptOnOther">The closest point on the other to this as a returned value.</param>
public double Distance(C2DArc Other, C2DPoint ptOnThis, C2DPoint ptOnOther)
{
List<C2DPoint> IntPts1 = new List<C2DPoint>();
List<C2DPoint> IntPts2 = new List<C2DPoint>();
C2DPoint ptThisCen = new C2DPoint( GetCircleCentre() );
C2DPoint ptOtherCen = new C2DPoint(Other.GetCircleCentre());
C2DCircle CircleThis = new C2DCircle( ptThisCen, Radius);
C2DCircle CircleOther = new C2DCircle( ptOtherCen, Other.Radius );
if (CircleThis.Crosses( CircleOther , IntPts1 ) )
{
for (int i = 0; i < IntPts1.Count; i++)
{
if ( (Line.IsOnRight( IntPts1[i] ) == ArcOnRight ) &&
(Other.Line.IsOnRight( IntPts1[i] ) == Other.ArcOnRight ) )
{
ptOnThis.Set(IntPts1[i]);
ptOnOther.Set(IntPts1[i]);
return 0;
}
}
IntPts1.Clear();
}
C2DLine LineCenToOther = new C2DLine();
LineCenToOther.point = new C2DPoint(ptThisCen);
LineCenToOther.vector = new C2DVector(ptThisCen, ptOtherCen);
LineCenToOther.GrowFromCentre( Math.Max(Radius, Other.Radius) * 10);
double dMinDist = 1.7E308;
double dDist = 0;
if ( Crosses(LineCenToOther, IntPts1) && Other.Crosses(LineCenToOther, IntPts2))
{
for (int i = 0 ; i < IntPts1.Count; i++)
{
for (int j = 0 ; j < IntPts2.Count; j++)
{
dDist = IntPts1[i].Distance(IntPts2[j]);
if (dDist < dMinDist)
{
ptOnThis.Set( IntPts1[i]);
ptOnOther.Set( IntPts2[j]);
dMinDist = dDist;
}
}
}
}
C2DPoint ptOnThisTemp = new C2DPoint();
dDist = Distance(Other.GetPointFrom(), ptOnThisTemp);
if (dDist < dMinDist)
{
ptOnThis.Set(ptOnThisTemp);
ptOnOther.Set(Other.GetPointFrom());
dMinDist = dDist;
}
dDist = Distance(Other.GetPointTo(), ptOnThisTemp);
if (dDist < dMinDist)
{
ptOnThis.Set(ptOnThisTemp);
ptOnOther.Set(Other.GetPointTo());
dMinDist = dDist;
}
C2DPoint ptOnOtherTemp = new C2DPoint();
dDist = Other.Distance(GetPointFrom(), ptOnOtherTemp);
if (dDist < dMinDist)
{
ptOnThis.Set( GetPointFrom());
ptOnOther.Set( ptOnOtherTemp);
dMinDist = dDist;
}
dDist = Other.Distance(GetPointTo(), ptOnOtherTemp);
if (dDist < dMinDist)
{
ptOnThis.Set( GetPointTo());
ptOnOther.Set( ptOnOtherTemp);
dMinDist = dDist;
}
return dMinDist;
}
/// <summary>
/// True if this crosses a curved line.
/// </summary>
/// <param name="Other">The other arc.</param>
/// <param name="IntersectionPts">The interection point list to recieve the result.</param>
public bool Crosses(C2DArc Other, List<C2DPoint> IntersectionPts)
{
C2DCircle TestCircleThis = new C2DCircle (GetCircleCentre(), Radius);
C2DCircle TestCircleOther= new C2DCircle (Other.GetCircleCentre(), Other.Radius);
List<C2DPoint> IntPtsTemp = new List<C2DPoint>();
if (TestCircleThis.Crosses(TestCircleOther, IntPtsTemp))
{
for (int i = IntPtsTemp.Count - 1; i >= 0 ; i--)
{
if ((Line.IsOnRight(IntPtsTemp[i]) ^ ArcOnRight) ||
Other.Line.IsOnRight(IntPtsTemp[i]) ^ Other.ArcOnRight ||
IntPtsTemp[i].PointEqualTo( Line.point) ||
IntPtsTemp[i].PointEqualTo( Line.GetPointTo()) ||
IntPtsTemp[i].PointEqualTo( Other.GetPointFrom()) ||
IntPtsTemp[i].PointEqualTo( Other.GetPointTo()))
{
IntPtsTemp.RemoveAt(i);
}
}
if (IntPtsTemp.Count == 0)
return false;
else
{
IntersectionPts.InsertRange(0, IntPtsTemp);
// IntPtsTemp.CopyTo( IntersectionPts );
// (*IntersectionPts) << IntPtsTemp;
return true;
}
}
else
{
return false;
}
}
