public static Point? GetNearest(Line2D l, Point p)
{
Point startPoint = new Point(l.StartPoint.X, l.StartPoint.Y);
Point endPoint = new Point(l.EndPoint.X, l.EndPoint.Y);
double x2 = endPoint.X;
double y2 = endPoint.Y;
Vector v = endPoint - startPoint;
double dAB = v.GetMagnitude();
double u = ((p.X - startPoint.X) * v.X + (p.Y - startPoint.Y) * v.Y) / dAB;
double x = startPoint.X + u * v.X;
double y = startPoint.Y + u * v.Y;
if (x > Math.Min(startPoint.X, endPoint.X)
&& x < Math.Max(startPoint.X, endPoint.X)
&& y > Math.Min(startPoint.Y, endPoint.Y)
&& y < Math.Max(startPoint.Y, endPoint.Y))
{
return new Point(x, y);
} else
{
return GetNearest(new List<Point>() { startPoint, endPoint }, p);
}
}
private void AddLine_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
if (lastClick == null)
lastClick = e.GetPosition(viewport.Viewport);
else
{
//var p1Ray = HT.Viewport3DHelper.GetRay(viewport.Viewport, lastClick.Value);
var p1 = HT.Viewport3DHelper.UnProject(viewport.Viewport, lastClick.Value, refPlane.Plane.Position, refPlane.Plane.Normal);
var p = e.GetPosition(viewport.Viewport);
//var p2Ray = HT.Viewport3DHelper.GetRay(viewport.Viewport, p);
var p2 = HT.Viewport3DHelper.UnProject(viewport.Viewport, p, refPlane.Plane.Position, refPlane.Plane.Normal);
var line2d = new Line2D(sketch,p1.Value,p2.Value);
sketch.Entities.Add(line2d);
lastClick = null;
viewport.Viewport.MouseLeftButtonUp -= AddLine_MouseLeftButtonUp;
activeControl.IsChecked = false; activeControl = null;
}
}
