/// <summary>
/// Converts the given <see cref="OrientedRectangle"/> from the world into the view coordinate space.
/// </summary>
internal static void WorldToIntermediateCoordinates(ICanvasContext context, OrientedRectangle rect)
{
var anchor = new PointD(rect.Anchor);
var anchorAndUp = anchor + rect.GetUp();
var renderContext = context as IRenderContext ?? context.Lookup(typeof(IRenderContext)) as IRenderContext;
if (renderContext != null)
{
anchor = renderContext.WorldToIntermediateCoordinates(anchor);
anchorAndUp = renderContext.WorldToIntermediateCoordinates(anchorAndUp);
}
else
{
var cc = context.Lookup(typeof(CanvasControl)) as CanvasControl;
if (cc != null)
{
anchor = cc.WorldToIntermediateCoordinates(anchor);
anchorAndUp = cc.WorldToIntermediateCoordinates(anchorAndUp);
}
else
{
// too bad - infer trivial scale matrix
anchor *= context.Zoom;
anchorAndUp *= context.Zoom;
}
}
rect.SetUpVector((anchorAndUp - anchor).Normalized);
rect.SetAnchor(anchor);
rect.Width *= context.Zoom;
rect.Height *= context.Zoom;
}
public Visual UpdateSelectionVisual(IRenderContext context, Visual oldVisual, IOrientedRectangle layout)
{
var container = oldVisual as VisualGroup;
if (container != null && container.Children.Count == 1)
{
var visual = container.Children[0] as FrameworkElement;
if (visual != null)
{
Transform transform = context.IntermediateTransform;
container.Transform = transform;
var anchor = layout.GetAnchorLocation();
var anchorAndUp = anchor + layout.GetUp();
anchor = context.WorldToIntermediateCoordinates(anchor);
anchorAndUp = context.WorldToIntermediateCoordinates(anchorAndUp);
var or = new OrientedRectangle();
or.SetUpVector((anchorAndUp - anchor).Normalized);
or.SetAnchor(anchor);
or.Width = layout.Width * context.Zoom;
or.Height = layout.Height * context.Zoom;
visual.Width = or.Width;
visual.Height = or.Height;
visual.SetCanvasArrangeRect(new Rect(0, 0, or.Width, or.Height));
ArrangeByLayout(context, visual, or, false);
if (!container.IsMeasureValid)
{
container.Arrange(new Rect(0, 0, or.Width, or.Height));
}
return(container);
}
}
return(CreateSelectionVisual(context, layout));
}