public Polygon TwoPieces(Polygon polygon1, Polygon polygon2, LineString line1, LineString line2)
{
if (polygon1.Intersects(polygon2) || polygon1.Touches(polygon2))
{
return polygon1.Union(polygon2) as Polygon;
}
else
{
var pg = GetConvexHull(line1, line2);
return pg.Union(polygon1).Union(polygon2) as Polygon;
}
}
/// <summary>
/// Returns true if the element intersect the rectangle from the parent class
/// </summary>
/// <param name="rect">The rectangle to test must be in the virtual modeling coordinant plane</param>
/// <returns></returns>
public virtual bool ElementInRectangle(Rectangle rect)
{
IGeometry rectanglePoly;
if ((rect.Height == 0) && (rect.Width == 0))
{
rectanglePoly = new Topology.Point(rect.X, rect.Y);
}
else if (rect.Width == 0)
{
Topology.Point[] rectanglePoints = new Topology.Point[2];
rectanglePoints[0] = new Topology.Point(rect.X, rect.Y);
rectanglePoints[1] = new Topology.Point(rect.X, rect.Y + rect.Height);
rectanglePoly = new LineString(rectanglePoints);
}
else if (rect.Height == 0)
{
Topology.Point[] rectanglePoints = new Topology.Point[2];
rectanglePoints[0] = new Topology.Point(rect.X, rect.Y);
rectanglePoints[1] = new Topology.Point(rect.X + rect.Width, rect.Y);
rectanglePoly = new LineString(rectanglePoints);
}
else
{
Topology.Point[] rectanglePoints = new Topology.Point[5];
rectanglePoints[0] = new Topology.Point(rect.X, rect.Y);
rectanglePoints[1] = new Topology.Point(rect.X, rect.Y + rect.Height);
rectanglePoints[2] = new Topology.Point(rect.X + rect.Width, rect.Y + rect.Height);
rectanglePoints[3] = new Topology.Point(rect.X + rect.Width, rect.Y);
rectanglePoints[4] = new Topology.Point(rect.X, rect.Y);
rectanglePoly = new Polygon(new LinearRing(rectanglePoints));
}
switch (Shape)
{
case ModelShape.Rectangle:
return (rect.IntersectsWith(Rectangle));
case ModelShape.Ellipse:
int b = Height / 2;
int a = Width / 2;
Topology.Point[] ellipsePoints = new Topology.Point[(4 * a) + 1];
for (int x = -a; x <= a; x++)
{
if (x == 0)
{
ellipsePoints[x + a] = new Topology.Point(Location.X + x + a, Location.Y);
ellipsePoints[3 * a - x] = new Topology.Point(Location.X + x + a, Location.Y + Height);
}
else
{
ellipsePoints[x + a] = new Topology.Point(Location.X + x + a, Location.Y + b - Math.Sqrt(Math.Abs(((b * b * x * x) / (a * a)) - (b * b))));
ellipsePoints[3 * a - x] = new Topology.Point(Location.X + x + a, Location.Y + b + Math.Sqrt(Math.Abs(((b * b * x * x) / (a * a)) - (b * b))));
}
}
Polygon ellipsePoly = new Polygon(new LinearRing(ellipsePoints));
return (ellipsePoly.Intersects(rectanglePoly));
case ModelShape.Triangle:
Topology.Point[] trianglePoints = new Topology.Point[4];
trianglePoints[0] = new Topology.Point(Location.X, Location.Y);
trianglePoints[1] = new Topology.Point(Location.X, Location.Y + Height);
trianglePoints[2] = new Topology.Point(Location.X + Width - 5, Location.Y + ((Height - 5) / 2));
trianglePoints[3] = new Topology.Point(Location.X, Location.Y);
Polygon trianglePoly = new Polygon(new LinearRing(trianglePoints));
return (trianglePoly.Intersects(rectanglePoly));
default:
return false;
}
}
