public override VectorPoint Copy()
{
ArcLinePoint point = new ArcLinePoint(X, Y);
point.Length = Length;
point.Length = Length;
point.Radius = Radius;
point.EndAngle = EndAngle;
point.StartAngle = StartAngle;
point.CircleCenterX = CircleCenterX;
point.CircleCenterY = CircleCenterY;
return(point);
}
/// <summary>Creates an arc around the given circle center. Note that nothing will
/// be seen until you call a fill or stroke method.</summary>
public void Arc(float centerX, float centerY, float radius, float sAngle, float eAngle, bool counterClockwise)
{
VectorPoint previous = LatestPathNode;
float x0;
float y0;
if (previous == null)
{
x0 = 0f;
y0 = 0f;
}
else
{
x0 = previous.X;
y0 = previous.Y;
}
// Clockwise eAngle > sAngle; counter clockwise otherwise.
if (eAngle > sAngle)
{
if (counterClockwise)
{
// Get them both in range:
eAngle = eAngle % TwoPI;
sAngle = sAngle % TwoPI;
// Reduce eAngle by a full rotation so it's smaller:
eAngle -= TwoPI;
}
}
else if (!counterClockwise)
{
// Get them both in range:
eAngle = eAngle % TwoPI;
sAngle = sAngle % TwoPI;
// Reduce sAngle by a full rotation so it's smaller:
sAngle -= TwoPI;
}
// First, figure out where the actual start is.
// It's radius units to the right of center, then rotated through radius around center.
// Thus we have a triangle with hyp length of 'radius' and an angle of sAngle:
float startX = radius * (float)Math.Cos(sAngle);
float startY = radius * (float)Math.Sin(sAngle);
// Now find the end point, using exactly the same method:
float endX = radius * (float)Math.Cos(eAngle);
float endY = radius * (float)Math.Sin(eAngle);
// We now have an arc from the current position to endX/endY.
// The start and exit node angles are usefully just offset from the given ones.
// This is because an sAngle of zero should create an arc which starts travelling downwards.
// (Or upwards if it's counter clockwise):
// Where does the arc start from?
float arcStartX = centerX + startX;
float arcStartY = centerY + startY;
if (FirstPathNode == null)
{
// This occurs if the arc is the first thing we draw. No line is drawn to it.
MoveTo(arcStartX, arcStartY);
}
else if (arcStartX != x0 || arcStartY != y0)
{
// Draw a line to this point:
LineTo(arcStartX, arcStartY);
}
// Create the new arc node:
ArcLinePoint arcNode = new ArcLinePoint(centerX + endX, centerY + endY);
// Apply the radius:
arcNode.Radius = radius;
// Apply the angles:
arcNode.StartAngle = sAngle;
arcNode.EndAngle = eAngle;
// Apply the center:
arcNode.CircleCenterX = centerX;
arcNode.CircleCenterY = centerY;
// Add the other end:
AddPathNode(arcNode);
}
public override VectorPoint Copy(){
ArcLinePoint point=new ArcLinePoint(X,Y);
point.Length=Length;
point.NormalX=NormalX;
point.NormalY=NormalY;
point.Length=Length;
point.Radius=Radius;
point.EndAngle=EndAngle;
point.StartAngle=StartAngle;
point.CircleCenterX=CircleCenterX;
point.CircleCenterY=CircleCenterY;
return point;
}
//--------------------------------------
