public List <PointAxis2d> GetGridLineIntersections(List <RangeAxis2d> gridAxes)
{
if (gridAxes == null)
{
return(null);
}
List <PointAxis2d> pointAxes = new List <PointAxis2d>();
foreach (RangeAxis2d gridAxis in gridAxes)
{
PointAxis2d pointAxis = new PointAxis2d(m_basis, gridAxis.Ordinal);
pointAxes.Add(pointAxis);
foreach (Polygon2d polygon in m_outline.Polygons)
{
if (polygon != null)
{
GetAxisIntersections(gridAxis, polygon, ref pointAxis);
}
}
}
return(pointAxes);
}
internal void GetAxisIntersections(RangeAxis2d gridAxis, Polygon2d polygon, ref PointAxis2d pointAxis)
{
if (polygon == null)
{
return;
}
List <Line2d> lines = polygon.Lines;
if (lines == null)
{
return;
}
foreach (RangeAxis2d.Value axisValue in gridAxis.CreateExtentsList())
{
for (int index = 0; index < lines.Count; ++index)
{
Line2d test = axisValue.ToLine(m_basis, gridAxis.Ordinal);
Line2d other = lines[index];
Point2d point = test.Intersect(other, true);
if (PointIsValid(point, other))
{
pointAxis.Add(PointAxis2d.Value.FromPoint2d(m_basis, gridAxis.Ordinal, point, true));
}
}
}
}
internal RangeAxis2d GetAxisSegments(PointAxis2d intersections)
{
int ordinal = intersections.Ordinal;
RangeAxis2d collinearSegments = new RangeAxis2d(m_basis, ordinal);
foreach (Polygon2d polygon in m_outline.Polygons)
{
foreach (Line2d line in polygon.Lines)
{
RangeAxis2d.Value value = RangeAxis2d.Value.FromLine2d(m_basis, ordinal, line, false);
if (value != null)
{
collinearSegments.Add(value);
}
}
}
RangeAxis2d segments = new RangeAxis2d(m_basis, ordinal);
foreach (KeyValuePair <int, List <double> > value in intersections.Points)
{
int abscissa = value.Key;
List <double> ordinates = value.Value;
if (ordinates.Count < 2)
{
continue;
}
for (int index = 0; index < ordinates.Count - 1;)
{
double first = ordinates[index++];
double next = ordinates[index++];
if (index < ordinates.Count)
{
Range1d segment = collinearSegments.Contains(new PointAxis2d.Value(abscissa, next));
if (segment != null && ordinates.Count % 3 == 0)
{
next = ordinates[index++];
}
}
segments.Add(abscissa, new Range1d(first, next));
}
}
return(segments);
}