void AddPointNormalized(MathHelpers.Point p)
{
int m = (int)mode;
CurvePoint cp = new CurvePoint(this);
cp.HorizontalAlignment = HorizontalAlignment.Left;
cp.VerticalAlignment = VerticalAlignment.Top;
cp.Width = 8;
cp.Height = 8;
cp.MouseDown += Point_MouseDown;
cp.MouseUp += Point_MouseUp;
cp.MouseMove += Point_MouseMove;
cp.Normalized = p;
Points[m].Add(cp);
CurveView.Children.Add(cp);
}
private void Point_MouseMove(object sender, MouseEventArgs e)
{
if (target == sender)
{
e.Handled = true;
Point ep = e.GetPosition(CurveView);
double dx = ep.X - mouseStart.X;
double dy = ep.Y - mouseStart.Y;
CurvePoint cp = target as CurvePoint;
MathHelpers.Point p = cp.Position;
p.X += dx;
p.Y += dy;
cp.Position = p;
mouseStart = ep;
//update curve
UpdatePath();
UpdateProperty();
}
}
/// <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);
}
