public TrimmedSurface(Surface surface, double angleTolerance = 60)
{
this.internalSurface = surface;
this.curvesByDirections = new Dictionary <Vector, TwoCurves>();
this.tolerance = angleTolerance;
// Walk through all perimeter curves
foreach (Curve curve in internalSurface.PerimeterCurves())
{
// get the curves direction
Vector direction = Vector.ByTwoPoints(curve.StartPoint, curve.EndPoint);
// If there hasnt been any curve collected add this as the first one
if (curvesByDirections.Count == 0)
{
curvesByDirections.Add(direction, new TwoCurves(curve));
}
else
{
// indicator to check if any curve matches its direction
bool matchingOrientation = false;
// Walk through all collected curves and check if the direction vectors are
// more or less parallel.
foreach (Vector vector in curvesByDirections.Keys.ToList())
{
if (direction.Parallel(vector, tolerance))
{
matchingOrientation = true;
// If there is a matching direction already in the dictionary,
// Add this curve to the existing curve
TwoCurves existingCurve = curvesByDirections[vector];
existingCurve.AddToMatchingCurve(curve);
}
}
// If there is no matching direction, this seems to be a new
// Side of the surface
if (!matchingOrientation)
{
curvesByDirections.Add(direction, new TwoCurves(curve));
}
}
}
}
public Curve GetCurveAtParameter(double parameter, bool flip)
{
// get the orthogonal boundries and the parallel to compare to
KeyValuePair <Vector, TwoCurves> data = this.curvesByDirections.First();
TwoCurves compareTo = this.curvesByDirections.Last().Value;
// if flip, swap the values
if (flip)
{
data = this.curvesByDirections.Last();
compareTo = this.curvesByDirections.First().Value;
}
// Get the orthogonal boundaries startpoints
Point A = data.Value.Curve1.PointAtParameter(0);
Point B = data.Value.Curve2.PointAtParameter(0);
Line l = Line.ByStartPointEndPoint(A, B);
// Get the desired startpoint
Point Async = data.Value.Curve1.PointAtParameter(parameter);
// Assuming the other boundary is upside down (other direction than Curve1)
// Get the desired endpoint using the inverted parameter
// eg. StartParameter = 0.2 therefore the endparameter must be 0.8
// If the curves are pointing in different directions
Point Bsync = data.Value.Curve2.PointAtParameter((1 - parameter));
// Check if the assumptin was true, otherwise just use the same
// parameter value: StartParam = 0.2 EndParam = 0.2
if (compareTo.AreEndpoints(A, B))
{
Bsync = data.Value.Curve2.PointAtParameter(parameter);
}
// Create the curve for the parameters
return(CreateCurve(compareTo, Async, Bsync, parameter, A));
}
private Curve CreateCurve(TwoCurves compareTo, Point A, Point B, double parameter, Point refpoint)
{
// Init an empty curve
Curve returnValue = null;
// If the boundaries to compare this curve to are arcs
// create a middle line between the boundaries
if (compareTo.Curve1.IsArc() || compareTo.Curve2.IsArc())
{
Line line = Line.ByStartPointEndPoint(compareTo.Curve1.PointAtParameter(0.5), compareTo.Curve2.PointAtParameter(0.5));
// If the reference point is on curve 2 invert the parameter
if (compareTo.Curve1.ClosestPointTo(refpoint).DistanceTo(refpoint) > 0)
{
parameter = 1 - parameter;
}
try
{
// try to create an arc by three points
returnValue = Arc.ByThreePoints(A, line.PointAtParameter(parameter), B);
}
catch (System.ApplicationException)
{
// On error create a line from A to B
returnValue = Line.ByStartPointEndPoint(A, B);
}
}
else
{
// If the boundaries are lines, create a line from A to B
returnValue = Line.ByStartPointEndPoint(A, B);
}
return(returnValue);
}
private Curve CreateCurve(TwoCurves compareTo, Point A, Point B, double parameter, Point refpoint)
{
// Init an empty curve
Curve returnValue = null;
// If the boundaries to compare this curve to are arcs
// create a middle line between the boundaries
if (compareTo.Curve1.IsArc() || compareTo.Curve2.IsArc())
{
Line line = Line.ByStartPointEndPoint(compareTo.Curve1.PointAtParameter(0.5), compareTo.Curve2.PointAtParameter(0.5));
// If the reference point is on curve 2 invert the parameter
if (compareTo.Curve1.ClosestPointTo(refpoint).DistanceTo(refpoint) > 0)
parameter = 1 - parameter;
try
{
// try to create an arc by three points
returnValue = Arc.ByThreePoints(A, line.PointAtParameter(parameter), B);
}
catch (System.ApplicationException)
{
// On error create a line from A to B
returnValue = Line.ByStartPointEndPoint(A, B);
}
}
else
// If the boundaries are lines, create a line from A to B
returnValue = Line.ByStartPointEndPoint(A, B);
return returnValue;
}
