private static SupportingPoint CalculateSymmetricPoint(SupportingPoint symmetryCenter, SupportingPoint point)
{
double x = symmetryCenter.X - (point.X - symmetryCenter.X);
double y = symmetryCenter.Y - (point.Y - symmetryCenter.Y);
return(new SupportingPoint(x, y));
}
private void Canvas_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (m_cursorMode == CursorMode.MovingPoints || m_isCurveDrawn)
{
return;
}
switch (m_lineType)
{
case BezierLineType.ArbitraryOrder:
{
var supportingPoint = new SupportingPoint(e.GetPosition(Canvas));
AddHandlers(supportingPoint);
m_points.Add(supportingPoint);
Canvas.Children.Add(supportingPoint);
}
break;
case BezierLineType.ThirdOrder:
{
if (m_points.Count == 4)
{
return;
}
var supportingPoint = new SupportingPoint(e.GetPosition(Canvas));
AddHandlers(supportingPoint);
m_points.Add(supportingPoint);
Canvas.Children.Add(supportingPoint);
}
break;
case BezierLineType.CompositeThirdOrder:
{
var supportingPoint = new SupportingPoint(e.GetPosition(Canvas));
AddHandlers(supportingPoint);
m_points.Add(supportingPoint);
Canvas.Children.Add(supportingPoint);
if (m_points.Count % 6 == 4 || (m_points.Count > 4 && m_points.Count % 6 == 1))
{
var size = m_points.Count;
supportingPoint = Utility.CalculateSymmetricPoint(m_points[size - 1], m_points[size - 2]);
AddHandlers(supportingPoint);
m_points.Add(supportingPoint);
Canvas.Children.Add(supportingPoint);
}
}
break;
default:
{
throw new Exception("Wrong BezierLineType");
}
}
}
public void AddPoint(SupportingPoint point)
{
m_supportingPoints.Add(point);
}
public object Clone()
{
var result = new SupportingPoint(X, Y);
return(result);
}
public Edge(SupportingPoint begin, SupportingPoint middle, SupportingPoint end)
{
Points.Add(begin);
Points.Add(middle);
Points.Add(end);
}
private void AddHandlers(SupportingPoint supportingPoint)
{
supportingPoint.MouseLeftButtonDown += PointStartMoving;
supportingPoint.MouseMove += PointMoving;
supportingPoint.MouseLeftButtonUp += PointEndMoving;
}