public void UpdatePath()
{
var bitmap = new RawBitmap(1024, 1024);
if (mesh != null)
{
if (mesh.uv != null && mesh.uv.Count == mesh.vertices.Count)
{
Parallel.For(0, mesh.triangles.Count, i =>
{
Triangle t = mesh.triangles[i];
Vector2 uv0 = mesh.uv[t.u0];
Vector2 uv1 = mesh.uv[t.u1];
Vector2 uv2 = mesh.uv[t.u2];
Point p = new Point(uv0.X * 1024, uv0.Y * 1024);
Point p2 = new Point(uv1.X * 1024, uv1.Y * 1024);
Point p3 = new Point(uv2.X * 1024, uv2.Y * 1024);
bitmap.DrawLine((int)p.X, (int)p.Y, (int)p2.X, (int)p2.Y, 0, 255, 255, 255);
bitmap.DrawLine((int)p2.X, (int)p2.Y, (int)p3.X, (int)p3.Y, 0, 255, 255, 255);
bitmap.DrawLine((int)p3.X, (int)p3.Y, (int)p.X, (int)p.Y, 0, 255, 255, 255);
});
}
}
Preview.Source = bitmap.ToImageSource();
}
/// <summary>
/// Renderes the path to the buffer
/// and returns the normalized curve data
/// the path should be a normalized set of points from 0 - 1
/// </summary>
/// <param name="path"></param>
/// <param name="buffer"></param>
/// <returns></returns>
protected List <MathHelpers.Point> RenderPath(List <CurvePoint> path, RawBitmap buffer, byte r = 175, byte g = 175, byte b = 175)
{
List <MathHelpers.Point> points = new List <MathHelpers.Point>();
List <MathHelpers.Point> curve = new List <MathHelpers.Point>();
List <MathHelpers.Point> normalized = new List <MathHelpers.Point>();
double width = CurveView.ActualWidth;
double height = CurveView.ActualHeight - 1;
foreach (CurvePoint p in path)
{
MathHelpers.Point n = p.Normalized;
points.Add(new MathHelpers.Point(n.X * width, n.Y * height));
}
Sort(points);
//make sure we have x points on edges
if (points.Count >= 2)
{
MathHelpers.Point f = points[0];
if (f.X > 0)
{
points.Insert(0, new MathHelpers.Point(0, f.Y));
}
MathHelpers.Point l = points[points.Count - 1];
if (l.X < width)
{
points.Add(new MathHelpers.Point(width, l.Y));
}
}
double[] sd = Curves.SecondDerivative(points.ToArray());
for (int i = 0; i < points.Count - 1; ++i)
{
MathHelpers.Point cur = points[i];
MathHelpers.Point next = points[i + 1];
for (double x = cur.X; x < next.X; ++x)
{
double t = (double)(x - cur.X) / (next.X - cur.X);
double a = 1 - t;
double bt = t;
double h = next.X - cur.X;
double y = a * cur.Y + bt * next.Y + (h * h / 6) * ((a * a * a - a) * sd[i] + (bt * bt * bt - bt) * sd[i + 1]);
if (y < 0)
{
y = 0;
}
if (y > height - 1)
{
y = height - 1;
}
curve.Add(new MathHelpers.Point(x, y));
normalized.Add(new MathHelpers.Point(x / width, y / height));
}
}
MathHelpers.Point lp = points[points.Count - 1];
curve.Add(lp);
normalized.Add(new MathHelpers.Point(lp.X / width, lp.Y / height));
Parallel.For(0, curve.Count - 1, i =>
{
MathHelpers.Point p1 = curve[i];
MathHelpers.Point p2 = curve[i + 1];
buffer.DrawLine((int)p1.X, (int)p1.Y, (int)p2.X, (int)p2.Y, r, g, b, 255);
});
return(normalized);
}