private void MouseDown(Viewport3D vp, ViewportEvent e)
{
if (!_currentTool.NoSelection())
{
var vtxs = _currentTool.GetVerticesAtPoint(e.X, vp.Height - e.Y, vp);
if (vtxs.Any())
{
// Use the topmost vertex as the control point
var vtx = vtxs.First();
// Mouse down on a point
if (vtx.IsSelected && KeyboardState.Ctrl && _currentTool.ShouldDeselect(vtxs))
{
// If the vertex is selected and ctrl is down, deselect the vertices
vtxs.ForEach(x => x.IsSelected = false);
}
else
{
if (!vtx.IsSelected && !KeyboardState.Ctrl && _currentTool.ShouldDeselect(vtxs))
{
// If we aren't clicking on a selected point and ctrl is not down, deselect the others
Points.ForEach(x => x.IsSelected = false);
// If this point is already selected, don't deselect others. This is the same behaviour as 2D selection.
}
vtxs.ForEach(x => x.IsSelected = true);
}
VertexSelectionChanged();
// Don't do other click operations
return;
}
// Nothing clicked
if (!KeyboardState.Ctrl)
{
// Deselect all the points if not ctrl-ing
Points.ForEach(x => x.IsSelected = false);
}
}
if (!_currentTool.No3DSelection())
{
// Do selection
var ray = vp.CastRayFromScreen(e.X, e.Y);
var hits = Document.Map.WorldSpawn.GetAllNodesIntersectingWith(ray, true);
var solid = hits
.OfType <Solid>()
.Select(x => new { Item = x, Intersection = GetIntersectionPoint(x, ray) })
.Where(x => x.Intersection != null)
.OrderBy(x => (x.Intersection - ray.Start).VectorMagnitude())
.Select(x => x.Item)
.FirstOrDefault();
if (solid != null)
{
if (solid.IsSelected && KeyboardState.Ctrl)
{
// deselect solid
var select = new MapObject[0];
var deselect = new[] { solid };
Document.PerformAction("Deselect VM solid", new ChangeSelection(select, deselect));
}
else if (!solid.IsSelected)
{
// select solid
var select = new[] { solid };
var deselect = !KeyboardState.Ctrl ? Document.Selection.GetSelectedObjects() : new MapObject[0];
Document.PerformAction("Select VM solid", new ChangeSelection(select, deselect));
}
// Don't do other click operations
return;
}
}
base.MouseDown(vp, e);
}