private Tuple <int?, RayHitTestParameters> GetMouseOver(MouseEventArgs e)
{
const double MAXHITDISTANCE = .035;
// Fire a ray from the mouse point
Point mousePoint = e.GetPosition(grdViewPort);
var ray = UtilityWPF.RayFromViewportPoint(_camera, _viewport, mousePoint);
var hit = _sketches.Sketches.
Select((o, i) => new
{
Index = i,
Position = o.Position,
Dot = Vector3D.DotProduct(ray.Direction, o.Position - ray.Origin)
}).
Where(o => o.Dot > 0). // throwing out points that are behind the camera
Select(o => new
{
o.Index,
o.Position,
Distance = Math3D.GetClosestDistance_Line_Point(ray.Origin, ray.Direction, o.Position)
}).
Where(o => o.Distance <= MAXHITDISTANCE).
OrderBy(o => (o.Position - ray.Origin).LengthSquared).
FirstOrDefault();
// Sooooon :)
//hit?.Index;
int?hitIndex = hit == null ? (int?)null : hit.Index;
return(Tuple.Create(hitIndex, ray));
}
private void ShowCircles()
{
_circleVisuals = null;
grdCircles.Children.Clear();
if (_triangles == null)
{
return;
}
_circleVisuals = new Ellipse[_triangles.Length];
for (int cntr = 0; cntr < _circleVisuals.Length; cntr++)
{
_circleVisuals[cntr] = new Ellipse();
Point3D center = _triangles[cntr].Triangle.GetCenterPoint();
double radius = Math1D.Min(
Math3D.GetClosestDistance_Line_Point(_triangles[cntr].Triangle.Point0, _triangles[cntr].Triangle.Point1 - _triangles[cntr].Triangle.Point0, center),
Math3D.GetClosestDistance_Line_Point(_triangles[cntr].Triangle.Point1, _triangles[cntr].Triangle.Point2 - _triangles[cntr].Triangle.Point1, center),
Math3D.GetClosestDistance_Line_Point(_triangles[cntr].Triangle.Point2, _triangles[cntr].Triangle.Point0 - _triangles[cntr].Triangle.Point2, center));
// Min is too small, but avg has overlap. Getting an inscribed circle would be the right way, but this is just a quick tester
//double radius = new double[] {
// Math3D.GetClosestDistanceBetweenPointAndLine(_triangles[cntr].Triangle.Point0, _triangles[cntr].Triangle.Point1 - _triangles[cntr].Triangle.Point0, center),
// Math3D.GetClosestDistanceBetweenPointAndLine(_triangles[cntr].Triangle.Point1, _triangles[cntr].Triangle.Point2 - _triangles[cntr].Triangle.Point1, center),
// Math3D.GetClosestDistanceBetweenPointAndLine(_triangles[cntr].Triangle.Point2, _triangles[cntr].Triangle.Point0 - _triangles[cntr].Triangle.Point2, center) }.Average();
_circleVisuals[cntr].HorizontalAlignment = HorizontalAlignment.Left;
_circleVisuals[cntr].VerticalAlignment = VerticalAlignment.Top;
_circleVisuals[cntr].Width = radius * 2d;
_circleVisuals[cntr].Height = radius * 2d;
_circleVisuals[cntr].Margin = new Thickness(center.X - radius, center.Y - radius, 0, 0);
_circleVisuals[cntr].Fill = Brushes.Transparent;
grdCircles.Children.Add(_circleVisuals[cntr]);
}
grdTriangles_SizeChanged(this, null);
}
