public Path GetCircumCircle(Polygon polygon)
{
if (!circles.ContainsKey(polygon))
{
Triad triad = triangles[polygon];
EllipseGeometry geometry = new EllipseGeometry();
geometry.Center = new Point(triad.CircumcircleX, triad.CircumcircleY);
geometry.RadiusX = geometry.RadiusY = Math.Sqrt(triad.CircumcircleR2);
geometry.Freeze();
Path path = new Path();
Panel.SetZIndex(path, CircleZIndex);
path.StrokeThickness = CircleStrokeTickness;
path.Stroke = new SolidColorBrush(circleStrokeColor);
path.Data = geometry;
circles[polygon] = path;
}
return circles[polygon];
}
public Path CreateVertexPoint(Vertex vertex)
{
if (this.verticesPaths == null)
{
this.verticesPaths = new Dictionary<Vertex, Path>();
}
if (!this.verticesPaths.ContainsKey(vertex))
{
EllipseGeometry geometry = new EllipseGeometry();
geometry.Center = new Point(vertex.X, vertex.Y);
geometry.RadiusX = geometry.RadiusY = VertexRadius;
geometry.Freeze();
Path path = new Path();
path.StrokeThickness = VertexTickness;
path.Stroke = new SolidColorBrush(VertexColor);
path.Data = geometry;
this.verticesPaths[vertex] = path;
}
return this.verticesPaths[vertex];
}
protected override void OnRender(DrawingContext dc)
{
// Draw background
dc.DrawRectangle(Brushes.White, null, new Rect(RenderSize));
Transform t = new MatrixTransform(TheModel.GetTikzToScreenTransform().ToWpfMatrix());
t.Freeze();
Pen pen = new Pen(Brushes.WhiteSmoke, 1);
pen.Freeze();
TheModel.DrawRaster(
(p1, p2) => dc.DrawLine(pen, t.Transform(p1), t.Transform(p2)),
(r1, r2) =>
{
EllipseGeometry eg = new EllipseGeometry(new Point(0, 0), r1, r2);
eg.Transform = t;
eg.Freeze();
dc.DrawGeometry(null, pen, eg);
});
}