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abstract private GetViewMatrix ( ) : |
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| return | ||
internal override Rect CalculateSubgraphBoundsInnerSpace(bool renderBounds)
{
Camera camera = Camera;
if (camera == null)
{
return(Rect.Empty);
}
//
// Cache the 3D bounding box for future use. Here we are relying on
// the fact that this method is called by PrecomputeContent(),
// which is called prior to all usages of _bboxChildrenSubgraph3D.
//
_bboxChildrenSubgraph3D = ComputeSubgraphBounds3D();
if (_bboxChildrenSubgraph3D.IsEmpty)
{
// Attempting to project empty bounds will result in NaNs which
// which will ruin descendant bounds for the 2D tree. We handle
// this explicitly and early exit with the correct answer.
return(Rect.Empty);
}
Rect viewport = Viewport;
// Common Case: Viewport3DVisual in a collasped UIElement.
if (viewport.IsEmpty)
{
// Creating a 3D homogenous space to 2D viewport space transform
// with an empty rectangle will result in NaNs which ruin the
// descendant bounds for the 2D tree. We handle this explicitly
// and early exit with the correct answer.
//
// (See also Windows OS Bugs #1637618)
return(Rect.Empty);
}
double aspectRatio = M3DUtil.GetAspectRatio(viewport.Size);
Matrix3D viewProjMatrix = camera.GetViewMatrix() * camera.GetProjectionMatrix(aspectRatio);
Rect projectedBounds2D = MILUtilities.ProjectBounds(ref viewProjMatrix, ref _bboxChildrenSubgraph3D);
Matrix homoToLocal = M3DUtil.GetHomogeneousToViewportTransform(viewport);
MatrixUtil.TransformRect(ref projectedBounds2D, ref homoToLocal);
return(projectedBounds2D);
}
internal Point WorldToViewport(Point4D point)
{
double aspectRatio = M3DUtil.GetAspectRatio(Viewport.Size);
Camera camera = Camera;
if (camera != null)
{
Matrix3D viewProjMatrix = camera.GetViewMatrix() * camera.GetProjectionMatrix(aspectRatio);
point *= viewProjMatrix;
Point point2D = new Point(point.X / point.W, point.Y / point.W);
point2D *= M3DUtil.GetHomogeneousToViewportTransform(Viewport);
return(point2D);
}
else
{
return(new Point(0, 0));
}
}
internal static Matrix3D GetWorldToViewportTransform3D(Camera camera, Rect viewport)
{
Debug.Assert(camera != null, "Caller is responsible for ensuring camera is not null.");
return camera.GetViewMatrix() *
camera.GetProjectionMatrix(M3DUtil.GetAspectRatio(viewport.Size)) *
M3DUtil.GetHomogeneousToViewportTransform3D(viewport);
}
