public static WPoint CalculateCubicBezierPoint(float t, WPoint wp1, WPoint wp2, WPoint wp3, WPoint wp4)
{
Point p1 = wp1.ToPoint();
Point p2 = wp2.ToPoint();
Point p3 = wp3.ToPoint();
Point p4 = wp4.ToPoint();
Point p = p1;
float u = 1 - t;
float tt = t * t;
float uu = u * u;
float uuu = uu * u;
float ttt = tt * t;
p.X *= uuu;
p.Y *= uuu;
p.X += 3 * uu * t * p2.X;
p.Y += 3 * uu * t * p2.Y;
p.X += 3 * u * tt * p3.X;
p.Y += 3 * u * tt * p3.Y;
p.X += ttt * p4.X;
p.Y += ttt * p4.Y;
return(new WPoint(p));
}
public void ClearPoint(WPoint wp)
{
if (canvas.Children.Contains(wp.Shell))
{
canvas.Children.Remove(wp.Shell);
}
}
private void Canvas_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
WPoint wp = new WPoint(Mouse.GetPosition(canvas));
switch (CommandBox.SelectedIndex)
{
case (int)Options.NewPoint:
WChains[ChainBox.SelectedIndex].List.Add(wp);
PointList.Add(wp.ToString());
if (WChains[ChainBox.SelectedIndex].List.Count > 1)
{
DM.DrawAdditionalPoint(WChains[ChainBox.SelectedIndex], wp);
}
break;
case (int)Options.NewLine:
WChains.Add(new WChain(wp));
int last = ChainList.Count;
ChainList.Add(WChains[last].ToString(last));
SetChainBoxIndex(last);
SetCommandBoxIndex((int)Options.NewPoint);
break;
}
DM.DrawPoint(wp, Brushes.DarkCyan);
}
public WChain(WPoint wp)
{
List = new List <WPoint>();
List.Add(wp);
Shell = new Polyline();
QBShell = new Polyline();
CBShell = new Polyline();
Dump = new List <Polyline>();
}
public void DrawAdditionalPoint(WChain wc, WPoint wp)
{
Polyline pl = new Polyline();
pl.Points.Add(wc.List.Last().ToPoint());
pl.Points.Add(wc.List[wc.List.Count - 2].ToPoint());
wc.Dump.Add(pl); //не очень изящное решение, still it works
pl.Stroke = Brushes.Black;
if (!canvas.Children.Contains(pl))
{
canvas.Children.Add(pl);
}
}
public void DrawPoint(WPoint wp, Brush b)
{
wp.Shell = new Rectangle();
wp.Shell.Stroke = Brushes.Black;
wp.Shell.Fill = b;
Canvas.SetTop(wp.Shell, wp.Ghost.Y - 3);
Canvas.SetLeft(wp.Shell, wp.Ghost.X - 3);
wp.Shell.HorizontalAlignment = HorizontalAlignment.Left;
wp.Shell.VerticalAlignment = VerticalAlignment.Top;
wp.Shell.Height = 6;
wp.Shell.Width = 6;
canvas.Children.Add(wp.Shell);
}
