public Point3D To3DPoint(Vector point)
{
LineRange r = new LineRange();
ViewportInfo.Point2DtoPoint3D(viewPort, point.ToPoint(), out r);
return(r.PointFromZ(-100));
}
/* This MouseDown event handler prints:
* (1) the current position of the mouse
* (2) the 3D mouse location on the ground plane (z = 0)
* (3) the 2D mouse location converted from the 3D location */
private void Window_MouseDown(object sender, MouseEventArgs e)
{
var range = new LineRange();
var isValid = ViewportInfo.Point2DtoPoint3D(Viewport, e.GetPosition(Viewport), out range);
if (!isValid)
{
MouseLabel.Content = "(no data)";
}
else
{
var point3D = range.PointFromZ(0);
var point = ViewportInfo.Point3DtoPoint2D(Viewport, point3D);
MouseLabel.Content = e.GetPosition(Viewport) + "\n" + point3D + "\n" + point;
}
}
private MousePosInfo3D GetPosition3D(Point pos2d)
{
LineRange lineRange;
if (ViewportInfo.Point2DtoPoint3D(viewport3d, pos2d, out lineRange))
{
return new MousePosInfo3D {
Pos2D = pos2d, Ray3D = lineRange
}
}
;
else
{
return new MousePosInfo3D {
Pos2D = pos2d, Ray3D = null
}
};
}
// Mouse moves occur in the Z=0 plane.
protected override void OnMouseMove(MouseEventArgs args)
{
base.OnMouseMove(args);
if (!isTracking)
{
return;
}
// Get the mouse position and adjust the translate transform.
Point ptMouse = args.GetPosition(viewport);
LineRange range;
ViewportInfo.Point2DtoPoint3D(viewport, ptMouse, out range);
Point3D pointNew = range.PointFromZ(transTracking.OffsetZ);
AdjustTranslateTransform(pointNew);
}
// Left mouse button click initiates tracking operation.
protected override void OnMouseLeftButtonDown(MouseButtonEventArgs args)
{
base.OnMouseLeftButtonDown(args);
Point ptMouse = args.GetPosition(viewport);
HitTestResult result = VisualTreeHelper.HitTest(viewport, ptMouse);
// We're only interested in 3D hits.
RayMeshGeometry3DHitTestResult result3d =
result as RayMeshGeometry3DHitTestResult;
if (result3d == null)
{
return;
}
// We're only interested in ModelVisual3D hits.
ModelVisual3D vis3d = result3d.VisualHit as ModelVisual3D;
if (vis3d == null)
{
return;
}
// We're only interested in visuals with translate transforms.
transTracking = vis3d.Transform as TranslateTransform3D;
if (transTracking == null)
{
return;
}
LineRange range;
ViewportInfo.Point2DtoPoint3D(viewport, ptMouse, out range);
pointOriginal = range.PointFromZ(transTracking.OffsetZ);
transOriginal = transTracking.Clone();
isTracking = true;
CaptureMouse();
Focus();
args.Handled = true;
}