private void VisualizeOtherAffectedObjects()
{
var IncludeOriginatedSubtree = (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift));
var IncludeTargetedSubtree = (Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl));
var OtherAffectedObjects = OwnerManager.OwnerView.GetCurrentManipulableObjects(IncludeOriginatedSubtree, IncludeTargetedSubtree, true)
.Select(obj => obj.Item1).Distinct() // Notice that duplicates are informed, so they must be excluded
.Except(ManipulatedObject.IntoEnumerable()); // Exclude current object to avoid visual interference in resizing
foreach (var AffectedObject in OtherAffectedObjects)
{
var DeltaX = 0.0;
var DeltaY = 0.0;
var DeltaWidth = 0.0;
var DeltaHeight = 0.0;
// Do not consider other intention, particularly resizing (due to its implicit move)
if (IntendedAction == ESymbolManipulationAction.Move)
{
DeltaX = ManipulatingHeadingRectangle.X - ManipulatedSymbol.BaseArea.X;
DeltaY = ManipulatingHeadingRectangle.Y - ManipulatedSymbol.BaseArea.Y;
}
// Only the manipulated symbol show a change in size
// (because multi-resize is postponed due to difficulty)
if (ManipulatedSymbol == AffectedObject)
{
DeltaWidth = ManipulatingHeadingRectangle.Width - ManipulatedSymbol.BaseArea.Width;
DeltaHeight = ManipulatingHeadingRectangle.Height - ManipulatedSymbol.BaseArea.Height;
}
Rect SelectionZone = AffectedObject is VisualSymbol symbol && symbol.IsHidden
? new Rect(AffectedObject.BaseCenter.X - 4, AffectedObject.BaseCenter.Y - 4,
8, 8)
: new Rect(AffectedObject.BaseLeft + DeltaX,
AffectedObject.BaseTop + DeltaY,
(AffectedObject.BaseWidth + DeltaWidth).EnforceMinimum(4),
(AffectedObject.TotalArea.Height + DeltaHeight).EnforceMinimum(4));
var SelectionGeom = (SelectionZone.Width > 8 && SelectionZone.Height > 8
? new CombinedGeometry(GeometryCombineMode.Exclude,
new RectangleGeometry(SelectionZone),
new RectangleGeometry(new Rect(SelectionZone.X + 4, SelectionZone.Y + 4,
(SelectionZone.Width - 8).EnforceMinimum(4),
(SelectionZone.Height - 8).EnforceMinimum(4))))
: (new RectangleGeometry(SelectionZone)) as Geometry);
var SelectionDrawing = new GeometryDrawing(FrmStroke, FrmPencil, SelectionGeom);
var SelectionVisual = SelectionDrawing.RenderToDrawingVisual();
SelectionVisual.Opacity = (AffectedObject.IsIn(OwnerManager.OwnerView.SelectedObjects)
? FrmOpacity : FrmOpacity / 2.0);
Indicators.Add(SelectionVisual);
}
}
