const float PRECISION = 1000; //000000000.0f;
public PolygonClipper(WPMF.Region regionSubject, WPMF.Region regionClipping)
{
// Setup subject and clipping polygons
this.regionSubject = regionSubject;
subject = new Polygon();
Contour scont = new Contour();
scont.AddRange(regionSubject.points);
for (int k = 0; k < scont.points.Count; k++)
{
scont.points[k] *= PRECISION;
}
subject.AddContour(scont);
clipping = new Polygon();
Contour ccont = new Contour();
ccont.AddRange(regionClipping.points);
for (int k = 0; k < ccont.points.Count; k++)
{
ccont.points[k] *= PRECISION;
}
clipping.AddContour(ccont);
// Init event queue
eventQueue = new EventQueue();
}
public Polygon Clone()
{
Polygon poly = new Polygon();
foreach (Contour cont in this.contours)
{
Contour c = new Contour();
c.AddRange(cont.points);
poly.AddContour(c);
}
return(poly);
}
/// <summary>
/// Since polygons from countries and provinces are not perfectly aligned in all cases, this method will take the largest contour and assume this is the resulting polygon
/// (even if it's not closed...)
/// </summary>
public Polygon ToPolygonFromLargestLineStrip()
{
// Check for empty result
if ((closedPolygons.Count == 0 ||
(closedPolygons.Count == 1 && closedPolygons[0].pointList.Count == 0)) &&
(openPolygons.Count == 0 ||
(openPolygons.Count == 1 && openPolygons[0].pointList.Count == 0)))
{
return(null);
}
// Get the largest contour (open or closed)
int maxPoints = -1;
PointChain largestPointChain = null;
foreach (PointChain pointChain in closedPolygons)
{
if (pointChain.pointList.Count > maxPoints)
{
maxPoints = pointChain.pointList.Count;
largestPointChain = pointChain;
}
}
foreach (PointChain pointChain in openPolygons)
{
if (pointChain.pointList.Count > maxPoints)
{
maxPoints = pointChain.pointList.Count;
largestPointChain = pointChain;
}
}
// ... and create a new polygon from that
if (maxPoints < 0)
{
return(null);
}
Polygon polygon = new Polygon();
Contour c = new Contour();
c.AddRange(largestPointChain.pointList);
polygon.AddContour(c);
FixOrientation(polygon);
return(polygon);
}
public Polygon ToPolygon()
{
// Check for empty result
if ((closedPolygons.Count == 0 ||
(closedPolygons.Count == 1 && closedPolygons[0].pointList.Count == 0)) &&
(openPolygons.Count == 0 ||
(openPolygons.Count == 1 && openPolygons[0].pointList.Count == 0)))
{
return(null);
}
Polygon polygon = new Polygon();
foreach (PointChain pointChain in closedPolygons)
{
Contour c = new Contour();
c.AddRange(pointChain.pointList);
polygon.AddContour(c);
}
FixOrientation(polygon);
return(polygon);
}
