/// <summary>
/// Performs a brute-force comparison of every segment in each <see cref="ISegmentString" />.
/// This has n^2 performance.
/// </summary>
/// <param name="e0"></param>
/// <param name="e1"></param>
private void ComputeVertexSnaps(INodableSegmentString e0, INodableSegmentString e1)
{
Coordinate[] pts0 = e0.Coordinates;
Coordinate[] pts1 = e1.Coordinates;
for (int i0 = 0; i0 < pts0.Length - 1; i0++)
{
HotPixel hotPixel = new HotPixel(pts0[i0], _scaleFactor, _li);
for (int i1 = 0; i1 < pts1.Length - 1; i1++)
{
// don't snap a vertex to itself
if (e0 == e1)
{
if (i0 == i1)
{
continue;
}
}
bool isNodeAdded = //AddSnappedNode(hotPixel, e1, i1);
hotPixel.AddSnappedNode(e1, i1);
// if a node is created for a vertex, that vertex must be noded too
if (isNodeAdded)
{
e0.AddIntersection(pts0[i0], i0);
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="mc"></param>
/// <param name="startIndex"></param>
public override void Select(MonotoneChain mc, int startIndex)
{
var ss = (INodableSegmentString)mc.Context;
/**
* Check to avoid snapping a hotPixel vertex to the same vertex.
* This method is called for segments which intersects the
* hot pixel,
* so need to check if either end of the segment is equal to the hot pixel
* and if so, do not snap.
*
* Sep 22 2012 - MD - currently do need to snap to every vertex,
* since otherwise the testCollapse1 test in SnapRoundingTest fails.
*/
if (_parentEdge != null)
{
if (ss == _parentEdge &&
(startIndex == _hotPixelVertexIndex)
)
{
return;
}
}
_isNodeAdded = _hotPixel.AddSnappedNode(ss, startIndex);
}
/// <summary>
///
/// </summary>
/// <param name="ss"></param>
/// <param name="snapPts"></param>
private void ComputeSnaps(INodableSegmentString ss, IEnumerable <Coordinate> snapPts)
{
foreach (Coordinate snapPt in snapPts)
{
HotPixel hotPixel = new HotPixel(snapPt, _scaleFactor, _li);
for (int i = 0; i < ss.Count - 1; i++)
{
//AddSnappedNode(hotPixel, ss, i);
hotPixel.AddSnappedNode(ss, i);
}
}
}