/// <inheritdoc />
protected override Rectangle UpdateVisual(IRenderContext context, Rectangle oldVisual, INode node)
{
var scale = 1 / context.Zoom;
var layout = GetSelectionBounds(node, scale);
var oldLayout = oldVisual.GetRenderDataCache <RectD>();
if (layout.GetSize() != oldLayout.GetSize())
{
// If the size changed we need to update the rectangle size.
oldVisual.Width = layout.Width;
oldVisual.Height = layout.Height;
CanvasControl.SetCanvasControlArrangeRect(oldVisual, layout);
oldVisual.SetRenderDataCache(layout);
// ReSharper disable CompareOfFloatsByEqualityOperator
}
else if (layout.X != oldLayout.X || layout.Y != oldLayout.Y)
{
// ReSharper restore CompareOfFloatsByEqualityOperator
// But if only the position changed, we can get away with just arranging the rectangle in the canvas again.
CanvasControl.SetCanvasControlArrangeRect(oldVisual, layout);
oldVisual.SetRenderDataCache(layout);
}
// Re-create the cached scaled stroke brush if necessary and set it on the rectangle.
UpdateStroke(oldVisual, scale);
return(oldVisual);
}
/// <summary>
/// Creates the rectangle with the necessary properties.
/// </summary>
/// <param name="layout">The intended layout for the rectangle.</param>
/// <returns></returns>
private Rectangle CreateRectangle(RectD layout)
{
var rect = new Rectangle
{
Width = layout.Width,
Height = layout.Height,
Fill = Fill,
Stroke = Stroke.Brush,
SnapsToDevicePixels = true
};
// Disable everything remotely related to anti-aliasing and pretty scaling.
RenderOptions.SetEdgeMode(rect, EdgeMode.Aliased);
// The bitmap scaling mode is necessary for the scaled stroke brush not to show moiré.
RenderOptions.SetBitmapScalingMode(rect, BitmapScalingMode.NearestNeighbor);
CanvasControl.SetCanvasControlArrangeRect(rect, layout);
return(rect);
}
