private void canvas_MouseMove(object sender, MouseEventArgs e)
{
if (mouseDown /*&& physics == null*/)
{
if (!mouseCaptured)
{
root.CaptureMouse();
mouseCaptured = true;
}
Vector3D position = Trackball.ProjectToTrackball(Width, Height, e.GetPosition(root));
Vector3D axis = Vector3D.CrossProduct(anchorPosition, position);
double angle = Vector3D.AngleBetween(anchorPosition, position);
if (axis != new Vector3D())
{
axis.Y *= -1;
Quaternion delta = new Quaternion(axis, angle);
camera.Rotation *= delta;
camera.UpDirection = camera.GetRotationMatrix().Transform(new Vector3D(0, 1, 0));
}
anchorPosition = position;
needsRefresh = true;
}
}
private void canvas_MouseButtonDown(object sender, MouseEventArgs e)
{
mouseDown = true;
anchorPosition = Trackball.ProjectToTrackball(Width, Height, e.GetPosition(root));
}