/// <summary>
/// Creates a polygon from a plane and a radius.
/// Expands the plane to the radius size to create a large polygon with 4 vertices.
/// </summary>
/// <param name="plane">The polygon plane</param>
/// <param name="radius">The polygon radius</param>
public Polygon(Plane plane, decimal radius = 1000000m)
{
Plane = plane;
// Get aligned up and right axes to the plane
var direction = Plane.GetClosestAxisToNormal();
var tempV = direction == Coordinate.UnitZ ? -Coordinate.UnitY : -Coordinate.UnitZ;
var up = tempV.Cross(Plane.Normal).Normalise();
var right = Plane.Normal.Cross(up).Normalise();
Vertices = new List<Coordinate>
{
plane.PointOnPlane + right + up, // Top right
plane.PointOnPlane - right + up, // Top left
plane.PointOnPlane - right - up, // Bottom left
plane.PointOnPlane + right - up, // Bottom right
};
Expand(radius);
}
/// <summary>
/// Creates a polygon from a plane and a radius.
/// Expands the plane to the radius size to create a large polygon with 4 vertices.
/// </summary>
/// <param name="plane">The polygon plane</param>
/// <param name="radius">The polygon radius</param>
public Polygon(Plane plane, decimal radius = 1000000m)
{
Plane = plane;
// Get aligned up and right axes to the plane
var direction = Plane.GetClosestAxisToNormal();
var tempV = direction == Coordinate.UnitZ ? -Coordinate.UnitY : -Coordinate.UnitZ;
var up = tempV.Cross(Plane.Normal).Normalise();
var right = Plane.Normal.Cross(up).Normalise();
Vertices = new List <Coordinate>
{
plane.PointOnPlane + right + up, // Top right
plane.PointOnPlane - right + up, // Top left
plane.PointOnPlane - right - up, // Bottom left
plane.PointOnPlane + right - up, // Bottom right
};
Expand(radius);
}
private void Render3D(Viewport3D vp)
{
if (_state == ClipState.None
|| _clipPlanePoint1 == null
|| _clipPlanePoint2 == null
|| _clipPlanePoint3 == null) return; // Nothing to draw at this point
TextureHelper.DisableTexturing();
// Draw points
if (!_clipPlanePoint1.EquivalentTo(_clipPlanePoint2)
&& !_clipPlanePoint2.EquivalentTo(_clipPlanePoint3)
&& !_clipPlanePoint1.EquivalentTo(_clipPlanePoint3))
{
var plane = new Plane(_clipPlanePoint1, _clipPlanePoint2, _clipPlanePoint3);
// Draw clipped solids
GL.Enable(EnableCap.LineSmooth);
GL.Hint(HintTarget.LineSmoothHint, HintMode.Nicest);
var faces = new List<Face>();
var idg = new IDGenerator();
foreach (var solid in Document.Selection.GetSelectedObjects().OfType<Solid>().ToList())
{
Solid back, front;
if (solid.Split(plane, out back, out front, idg))
{
faces.AddRange(back.Faces);
faces.AddRange(front.Faces);
}
}
GL.LineWidth(2);
GL.Color3(Color.White);
DataStructures.Rendering.Rendering.DrawWireframe(faces, true);
GL.LineWidth(1);
GL.Hint(HintTarget.LineSmoothHint, HintMode.Fastest);
GL.Disable(EnableCap.LineSmooth);
// Draw the clipping plane
var u = plane.Normal.Cross(plane.GetClosestAxisToNormal() == Coordinate.UnitZ ? Coordinate.UnitX : Coordinate.UnitZ);
var v = plane.Normal.Cross(u);
var point = (_clipPlanePoint1 + _clipPlanePoint2 + _clipPlanePoint3) / 3;
var dx = u * 10000;
var dy = v * 10000;
GL.Disable(EnableCap.CullFace);
GL.Begin(BeginMode.Quads);
GL.Color4(Color.FromArgb(100, Color.Turquoise));
Action<Coordinate> render = c => GL.Vertex3(c.DX, c.DY, c.DZ);
render(point - dx - dy);
render(point + dx - dy);
render(point + dx + dy);
render(point - dx + dy);
GL.End();
GL.Enable(EnableCap.CullFace);
}
TextureHelper.EnableTexturing();
}
