private bool isLinearEdgeEnabled(PlanarGraphEdge edge, OverlayType operation, Polygon polygon, bool inverseArgs)
{
if (isAreaEdgeEnabled(edge, operation, polygon, inverseArgs))
return false;
switch (operation)
{
case OverlayType.Intersection:
return edge.Label.UsedByObject1 && (edge.Label.UsedByObject2 || polygon.ContainsPoint(edge.CenterPoint()));
case OverlayType.Union:
return edge.Label.UsedByObject1 && !polygon.ContainsPoint(edge.CenterPoint());
case OverlayType.Difference:
return inverseArgs ? false :
edge.Label.UsedByObject1 &&
!polygon.ContainsPoint(edge.CenterPoint()) &&
!edge.Label.UsedByObject2;
case OverlayType.SymmetricDifference:
return edge.Label.UsedByObject1 &&
!polygon.ContainsPoint(edge.CenterPoint()) &&
!edge.Label.UsedByObject2;
}
return false;
}
private bool isAreaEdgeEnabled(PlanarGraphEdge edge, OverlayType operation, Polygon p1, Polygon p2)
{
bool usebyPolygon1 = edge.Label.UsedByObject1;
bool usebyPolygon2 = edge.Label.UsedByObject2;
switch (operation)
{
case OverlayType.Intersection:
if (usebyPolygon1 && usebyPolygon2 && edge.OrientationInObject1 == edge.OrientationInObject2)
return true;
if ((usebyPolygon1 ^ usebyPolygon2))
if (usebyPolygon1)
{
if (p2.ContainsPoint(edge.CenterPoint()))
return true;
}
else
{
if (p1.ContainsPoint(edge.CenterPoint()))
return true;
}
break;
case OverlayType.Union:
if (usebyPolygon1 && usebyPolygon2 && edge.OrientationInObject1 == edge.OrientationInObject2)
return true;
if ((usebyPolygon1 ^ usebyPolygon2))
if (usebyPolygon1)
{
if (!p2.ContainsPoint(edge.CenterPoint()))
return true;
}
else
{
if (!p1.ContainsPoint(edge.CenterPoint()))
return true;
}
break;
case OverlayType.Difference:
if (usebyPolygon1 && usebyPolygon2 && edge.OrientationInObject1 != edge.OrientationInObject2)
return true;
if ((usebyPolygon1 ^ usebyPolygon2))
if (usebyPolygon1)
{
if (!p2.ContainsPoint(edge.CenterPoint()))
return true;
}
else
{
if (p1.ContainsPoint(edge.CenterPoint()))
return true;
}
break;
case OverlayType.SymmetricDifference:
if ((usebyPolygon1 ^ usebyPolygon2))
return true;
break;
}
return false;
}