/// <summary>
/// Adds new points to the SnapClass' point index.
/// </summary>
/// <param name="newShape">The shape containing data to add to the points index.</param>
public void AddShapeData(int shpIndex, int snaplayeridx)
{
int numPoints = 0;
double [] pts;
System.Array arr = ((MapWinGIS.Shapefile)m_sfs[snaplayeridx]).QuickPoints(shpIndex, ref numPoints);
pts = new double[arr.Length];
arr.CopyTo(pts, 0);
arr = null;
for (int j = 0; j < pts.Length; j += 2)
{
if (((System.Collections.SortedList)m_lists[snaplayeridx]).ContainsKey(pts[j]))
{ // the x value is already in the list. Add the y value to the "values" list.
System.Collections.SortedList yLst;
yLst = (System.Collections.SortedList)((System.Collections.SortedList)m_lists[snaplayeridx]).GetByIndex(((System.Collections.SortedList)m_lists[snaplayeridx]).IndexOfKey(pts[j]));
if (yLst.ContainsKey(pts[j + 1]) == false)
{ // does not contain the y point yet
SnapData data = new SnapData(shpIndex, (int)j / 2, new PointD(pts[j], pts[j + 1]));
System.Collections.ArrayList l = new System.Collections.ArrayList();
l.Add(data);
yLst.Add(pts[j + 1], l);
}
else
{ // already containt the y point (duplicate point)
SnapData data = new SnapData(shpIndex, (int)j / 2, new PointD(pts[j], pts[j + 1]));
((System.Collections.ArrayList)yLst.GetByIndex(yLst.IndexOfKey(pts[j + 1]))).Add(data);
}
}
else
{
System.Collections.SortedList y_list = new System.Collections.SortedList();
SnapData data = new SnapData(shpIndex, (int)j / 2, new PointD(pts[j], pts[j + 1]));
System.Collections.ArrayList l = new System.Collections.ArrayList();
l.Add(data);
y_list.Add(pts[j + 1], l);
((System.Collections.SortedList)m_lists[snaplayeridx]).Add(pts[j], y_list);
}
}
pts = null;
}
/// <summary>
/// Finds the nearest point to the requested location that is within the tolerance radius.
/// </summary>
/// <param name="ProjectedRadius">The tolerance radius in projected units used to search for the nearest point that can be snapped to.</param>
/// <param name="x">x coordinate in projected map units</param>
/// <param name="y">y coordinate in projected map units</param>
/// <param name="curShape">The shape that is currently being created. Points from this shape are also checked.</param>
/// <param name="BestPoint">A PointD class with the location of the nearest point to snap to if there is are any within the tolerance, null if no points are found.</param>
/// <returns>Returns true if there is a point to snap to.</returns>
public bool CanSnap(double ProjectedRadius, double x, double y, ShapeClass curShape, ref System.Collections.ArrayList BestPoints)
{
System.Collections.IDictionaryEnumerator ie = m_lists.GetEnumerator();
PointD myBest = null;
System.Collections.ArrayList myBestPoints = null;
while (ie.MoveNext())
{
int snaplayeridx = (int)ie.Key;
// find any points that are within the tolerance in curShape.
for (int i = 0; i < curShape.NumPoints; i++)
{
PointD pt = curShape[i];
double d = pt.Dist(x, y);
if (d < ProjectedRadius)
{
if (myBest != null)
{
if (d < myBest.Dist(x, y))
{
myBest = pt;
}
}
else
{
myBest = pt;
}
}
}
if (myBest != null)
{
SnapData d = new SnapData(-1, -1, myBest);
myBestPoints = new System.Collections.ArrayList();
myBestPoints.Add(d);
}
if (CanSnap(ProjectedRadius, x, y, ref BestPoints))
{ // work with that best point.
if (myBest != null)
{
PointD tPoint = ((SnapData)BestPoints[0]).point;
if (myBest.Dist(x, y) < tPoint.Dist(x, y))
{
if (BestPoints == null)
{
BestPoints = new System.Collections.ArrayList();
}
BestPoints.AddRange(myBestPoints);
}
}
}
else
{
if (myBestPoints != null)
{
if (BestPoints == null)
{
BestPoints = new System.Collections.ArrayList();
}
BestPoints.AddRange(myBestPoints);
}
}
}
if (BestPoints == null)
{
return(false);
}
else
{
return(true);
}
}
