/// <summary>
/// Extrude a Polyon.
/// </summary>
/// <param name="perimeter">The Polygon to extrude.</param>
/// <param name="voids">A collection of Polygons representing voids in the extrusion.</param>
/// <param name="height">The height of the extrusion.</param>
/// <param name="capped">A flag indicating whether the extrusion should be capped.</param>
/// <returns></returns>
public static Mesh Extrude(Polygon perimeter, double height, IList <Polygon> voids = null, bool capped = true)
{
var mesh = new Hypar.Geometry.Mesh();
var perimeters = new List <Polygon>();
perimeters.Add(perimeter);
if (voids != null)
{
perimeters.AddRange(voids);
}
foreach (var boundary in perimeters)
{
var verts = boundary.Vertices;
for (var i = 0; i < verts.Count; i++)
{
Vector3 a;
Vector3 b;
if (i == verts.Count - 1)
{
a = verts[i];
b = verts[0];
}
else
{
a = verts[i];
b = verts[i + 1];
}
var v1 = new Vector3(a.X, a.Y, 0.0);
var v2 = new Vector3(b.X, b.Y, 0.0);
var v3 = new Vector3(b.X, b.Y, height);
var v4 = new Vector3(a.X, a.Y, height);
mesh.AddQuad(new [] { v1, v2, v3, v4 });
}
}
if (capped)
{
mesh.AddTesselatedFace(perimeter, voids, new Transform());
mesh.AddTesselatedFace(perimeter, voids, new Transform(new Vector3(0, 0, height)), true);
}
return(mesh);
}
/// <summary>
/// Extrude an Polygon along an ICurve.
/// </summary>
/// <param name="curve">The ICurve along which to extrude.</param>
/// <param name="perimeter">A Polygon to extrude.</param>
/// <param name="voids">A collection of Polygons representing voids in the extrusion.</param>
/// <param name="capped">A flag indicating whether the extrusion should be capped.</param>
/// <param name="startSetback">The setback trom the start of the line of the extrusion.</param>
/// <param name="endSetback">The setback from the end of the line of the end of the extrusion.</param>
/// <returns></returns>
public static Mesh ExtrudeAlongCurve(ICurve curve, Polygon perimeter, IList <Polygon> voids = null, bool capped = true, double startSetback = 0.0, double endSetback = 0.0)
{
var mesh = new Hypar.Geometry.Mesh();
var l = curve.Length;
var ssb = startSetback / l;
var esb = endSetback / l;
var transforms = new List <Transform>();
var polys = new List <Polygon>();
transforms.AddRange(curve.Frames(ssb, esb));
for (var i = 0; i < transforms.Count - 1; i++)
{
ExtrudePolygon(ref mesh, perimeter, transforms[i], transforms[i + 1]);
if (voids != null)
{
foreach (var p in voids)
{
ExtrudePolygon(ref mesh, p, transforms[i], transforms[i + 1], true);
}
}
}
if (curve is Polygon)
{
ExtrudePolygon(ref mesh, perimeter, transforms[transforms.Count - 1], transforms[0]);
if (voids != null)
{
foreach (var p in voids)
{
ExtrudePolygon(ref mesh, p, transforms[transforms.Count - 1], transforms[0], true);
}
}
}
if (capped)
{
mesh.AddTesselatedFace(perimeter, voids, transforms[0]);
mesh.AddTesselatedFace(perimeter, voids, transforms[transforms.Count - 1], true);
}
return(mesh);
}