/// <summary>
/// Returns a list of Vector3 points representing the corners of the Polygon's orthogonal bounding box.
/// </summary>
public static List <Vector3> BoxCorners(this Polygon polygon)
{
var box = new CompassBox(polygon);
return(new List <Vector3>
{
box.SW,
box.SE,
box.NE,
box.NW
});
}
/// <summary>
/// Creates a rectilinear Polygon in the specified adjacent quadrant to the supplied Polygon's bounding box.
/// </summary>
/// <param name="area">Desired area of the new Polygon.</param>
/// <param name="orient">Relative cardinal direction in which the new Polygon will be placed.</param>
/// <returns>
/// A new Polygon.
/// </returns>
public static Polygon AdjacentArea(Polygon polygon, double area, Orient orient)
{
if (polygon == null)
{
return(null);
}
var box = new CompassBox(polygon);
double sizeX;
double sizeY = 0.0;
if (orient == Orient.N || orient == Orient.S)
{
sizeX = box.SizeX;
sizeY = area / box.SizeX;
}
else
{
sizeX = area / box.SizeY;
sizeY = box.SizeY;
}
Vector3 origin = Vector3.Origin;
switch (orient)
{
case Orient.N:
origin = box.NW;
break;
case Orient.E:
origin = box.SE;
break;
case Orient.S:
origin = new Vector3(box.SW.X, box.SW.Y - sizeY);
break;
case Orient.W:
origin = new Vector3(box.SW.X - sizeX, box.SW.Y);
break;
}
return
(new Polygon
(
new[]
{
origin,
new Vector3(origin.X + sizeX, origin.Y),
new Vector3(origin.X + sizeX, origin.Y + sizeY),
new Vector3(origin.X, origin.Y + sizeY)
}
));
}
/// <summary>
/// Creates a rotated 2D grid of Vector3 points from the supplied Polygon, axis intervals, and angle.
/// </summary>
/// <param name="perimeter">Polygon boundary of the point grid.</param>
/// <param name="xInterval">Spacing of the grid along the x-axis.</param>
/// <param name="yInterval">Spacing of the grid along the y-axis.</param>
/// <param name="angle">Rotation of the grid around the Polygon centroid.</param>
/// <returns>
/// A new CoordGrid.
/// </returns>
public CoordinateGrid(Polygon polygon, double xInterval = 1.0, double yInterval = 1.0, double angle = 0.0)
{
if (polygon == null)
{
return;
}
random = new Random();
Allocated = new List <Vector3>();
Available = new List <Vector3>();
Perimeter = Shaper.MakePolygon(polygon.Vertices.ToList());
var centroid = polygon.Centroid();
var box = new CompassBox(polygon);
var points = new List <Vector3>();
// Northeast quadrant
var x = centroid.X + (xInterval * 0.5);
var y = centroid.Y + (yInterval * 0.5);
while (y <= box.NW.Y)
{
while (x <= box.SE.X)
{
points.Add(new Vector3(x, y));
x += xInterval;
}
x = centroid.X + (xInterval * 0.5);
y += yInterval;
}
// Northwest quadrant
x = centroid.X - (xInterval * 0.5);
y = centroid.Y + (yInterval * 0.5);
while (y <= box.NW.Y)
{
while (x >= box.SW.X)
{
points.Add(new Vector3(x, y));
x -= xInterval;
}
x = centroid.X - (xInterval * 0.5);
y += yInterval;
}
// Southeast quadrant
x = centroid.X + (xInterval * 0.5);
y = centroid.Y - (yInterval * 0.5);
while (y >= box.SW.Y)
{
while (x <= box.SE.X)
{
points.Add(new Vector3(x, y));
x += xInterval;
}
x = centroid.X + (xInterval * 0.5);
y -= yInterval;
}
// Southwest quadrant
x = centroid.X - (xInterval * 0.5);
y = centroid.Y - (yInterval * 0.5);
while (y >= box.SW.Y)
{
while (x >= box.SW.X)
{
points.Add(new Vector3(x, y));
x -= xInterval;
}
x = centroid.X - (xInterval * 0.5);
y -= yInterval;
}
foreach (var pnt in points)
{
var point = pnt.Rotate(centroid, angle);
if (polygon.Covers(point))
{
Available.Add(point);
}
}
}
