public int SnapHierarchy(DidSnapModes mode)
{
switch (mode)
{
case DidSnapModes.DidSnapToIntersectionPoint:
return(1);
case DidSnapModes.DidSnapToObjectSnapPoint:
return(1);
case DidSnapModes.DidSnapToTangentPoint:
return(2);
case DidSnapModes.DidSnapToDropPoint:
return(2);
case DidSnapModes.DidSnapToObjectCenter:
return(3);
case DidSnapModes.DidSnapToObjectPoint:
return(4);
case DidSnapModes.DidSnapToGridPoint:
return(5);
case DidSnapModes.DidAdjustOrtho:
return(6);
default:
return(7);
}
}
public void Init(System.Drawing.Point SourcePoint, Projection projection, SnapModes SnapMode, int MaxDist)
#endif
{
this.BestDist = double.MaxValue;
this.BestObject = null;
this.SnapPointIndex = 0;
SourceBeam = projection.PointBeam(SourcePoint);
this.SourcePoint = projection.ProjectionPlane.Intersect(SourceBeam);
this.Projection = projection;
this.SnapPoint = projection.DrawingPlanePoint(SourcePoint);
// MaxDist die die maximale Entfernung des Fangpunktes vom aktuellen Punkt bezogen auf die ProjectionPlane
#if WEBASSEMBLY
GeoPoint2D p1 = projection.ProjectionPlane.Intersect(projection.PointBeam(new CADability.WebDrawing.Point(SourcePoint.X, SourcePoint.Y + MaxDist)));
GeoPoint2D p2 = projection.ProjectionPlane.Intersect(projection.PointBeam(new CADability.WebDrawing.Point(SourcePoint.X + MaxDist, SourcePoint.Y)));
GeoPoint2D p3 = projection.ProjectionPlane.Intersect(projection.PointBeam(new CADability.WebDrawing.Point(SourcePoint.X, SourcePoint.Y - MaxDist)));
GeoPoint2D p4 = projection.ProjectionPlane.Intersect(projection.PointBeam(new CADability.WebDrawing.Point(SourcePoint.X - MaxDist, SourcePoint.Y)));
#else
GeoPoint2D p1 = projection.ProjectionPlane.Intersect(projection.PointBeam(new System.Drawing.Point(SourcePoint.X, SourcePoint.Y + MaxDist)));
GeoPoint2D p2 = projection.ProjectionPlane.Intersect(projection.PointBeam(new System.Drawing.Point(SourcePoint.X + MaxDist, SourcePoint.Y)));
GeoPoint2D p3 = projection.ProjectionPlane.Intersect(projection.PointBeam(new System.Drawing.Point(SourcePoint.X, SourcePoint.Y - MaxDist)));
GeoPoint2D p4 = projection.ProjectionPlane.Intersect(projection.PointBeam(new System.Drawing.Point(SourcePoint.X - MaxDist, SourcePoint.Y)));
#endif
this.MaxDist = Math.Max(Math.Max(p1 | this.SourcePoint, p2 | this.SourcePoint), Math.Max(p3 | this.SourcePoint, p4 | this.SourcePoint));
pickArea = projection.GetPickSpace(new Rectangle(SourcePoint.X - MaxDist, SourcePoint.Y - MaxDist, 2 * MaxDist, 2 * MaxDist));
this.BasePointValid = false;
this.SnapMode = SnapMode;
this.DidSnap = DidSnapModes.DidNotSnap;
faceDist = double.MaxValue;
}
/// <summary>
/// The <see cref="IGeoObject"/> obj offers the point p as a snappoint in the given mode.
/// This method checks whether to use this point as the closest snap point.
/// This method is typically called by GeoObjects from the <see cref="IGeoObject.FindSnapPoint"/> method.
/// </summary>
/// <param name="p"></param>
/// <param name="obj"></param>
/// <param name="mode"></param>
public void Check(GeoPoint p, IGeoObject obj, DidSnapModes mode)
{
GeoPoint p2 = Geometry.DropPL(p, SourceBeam.Location, SourceBeam.Direction);
double d = Projection.WorldToProjectionPlane(p) | Projection.WorldToProjectionPlane(p2);
// d ist der Abstand bezogen auf die projectionplane
bool DoIt = false;
if (SnapHierarchy(mode) <= SnapHierarchy(DidSnap))
{
if (mode == DidSnapModes.DidSnapToFaceSurface)
{ // hier zählt die sichtbare Fläche, die das
// kleinste faceDist hat. Das wird in Face gecheckt
DoIt = true;
}
else if (SnapHierarchy(mode) == SnapHierarchy(DidSnap))
{
DoIt = (d < BestDist && d < MaxDist);
}
else
{
DoIt = d < MaxDist;
}
if (mode == DidSnapModes.DidSnapToDropPoint ||
mode == DidSnapModes.DidSnapToObjectCenter ||
mode == DidSnapModes.DidSnapToTangentPoint)
{
DoIt = d < BestDist;
}
if (mode == DidSnapModes.DidAdjustOrtho || mode == DidSnapModes.DidSnapToGridPoint)
{
DoIt = true; // Orthogonal unabhängig von der Entfernung
}
}
if (DoIt)
{
SnapPoint = p;
BestDist = d;
DidSnap = mode;
BestObject = obj;
}
}
