Is it possible for a WPF control to have an ActualWidth and ActualHeight if it has never been render
- by DanM
I need a Viewport3D for the sole purpose of doing geometric calculations using Petzold.Media3D.ViewportInfo. I do now want to place it in a Window.
I'm creating a Viewport3D using the following code:
private Viewport3D CreateViewport(MainSettings settings)
{
var cameraPosition = new Point3D(0, 0, settings.CameraHeight);
var cameraLookDirection = new Vector3D(0, 0, -1);
var cameraUpDirection = new Vector3D(0, 1, 0);
var camera = new PerspectiveCamera
{
Position = cameraPosition,
LookDirection = cameraLookDirection,
UpDirection = cameraUpDirection
};
var viewport = new Viewport3D
{
Camera = camera,
Width = settings.ViewportWidth,
Height = settings.ViewportHeight
};
return viewport;
}
Later, I'm attempting to use this viewport to convert the mouse location to a 3D location using this method:
public Point3D? Point2dToPoint3d(Point point)
{
var range = new LineRange();
var isValid = ViewportInfo.Point2DtoPoint3D(_viewport, point, out range);
if (isValid)
return range.PointFromZ(0);
else
return null;
}
Unfortunately, it's not working. I think the reason is that the ActualWidth and ActualHeight of the viewport and both zero (and these are read-only properties, so I can't set them manually). (I have tested the exact same with an actual rendered Viewport3D, so I know the issue is not with my converter method.)
Any idea how I can get WPF to assign the ActualWidth and ActualHeight based on my Width and Height settings?
I tried setting the HorizontalAlignment and VerticalAlignment to Left and Top, respectively, and I also messed with the MinWidth and MinHeight, but none of these properties had any effect on the ActualWidth or ActualHeight.
