protected override bool InsideOrCrossingScreenPolygon(ScreenPolygonParams data)
{
// Computes the lines that are inside or crossing the screen polygon
for (int i = 0; i < Lines.Length; i++)
{
Segment2D seg;
IndexLine line = Lines[i];
Point3D pt1 = Vertices[line.V1];
Point3D pt2 = Vertices[line.V2];
Point3D screenP1 = vp.Camera.WorldToScreen(pt1, data.ViewFrame);
Point3D screenP2 = vp.Camera.WorldToScreen(pt2, data.ViewFrame);
if (screenP1.Z > 1 || screenP2.Z > 1)
{
return(false); // for perspective
}
seg = new Segment2D(screenP1, screenP2);
if (UtilityEx.PointInPolygon(screenP1, data.ScreenPolygon) ||
UtilityEx.PointInPolygon(screenP2, data.ScreenPolygon))
{
SelectedSubItems.Add(i);
continue;
}
for (int j = 0; j < data.ScreenSegments.Count; j++)
{
Point2D i0;
if (Segment2D.Intersection(data.ScreenSegments[j], seg, out i0))
{
SelectedSubItems.Add(i);
break;
}
}
}
return(false);
}
