Rotation, Grid, and Visibility

These features are optional, but they matter in editors, diagramming tools, and debugging overlays.

Rotation

Rotation state is exposed by:

Rotate(...)
RotateAt(...)
ResetRotation(...)
SnapRotation()
Rotation
MinRotation, MaxRotation
EnableRotationSnapping, RotationSnapAngle

The current implementation provides rotation state management and constraints. If your UX depends on deeper rotation customization, treat this as an advanced integration point rather than a complete 2D design surface out of the box.

Grid And Snap

Grid-related properties configure a logical grid model:

ShowGrid
GridSize
GridBrush
GridThickness
GridOpacity
MajorGridInterval
MajorGridBrush
MajorGridThickness
EnableSnapToGrid

The helper methods SnapToGrid(double), SnapToGrid(Point), and SnapToGrid(Rect) are implemented directly. Grid drawing itself is left to the host application.

Visibility Queries

Use viewport queries to cull overlays or lazily render expensive content:

IsRectangleVisible(Rect rect)
IsPointVisible(Point point)
GetVisiblePortion(Rect rect)

Accessibility And Indicators

UpdateAccessibilityDescriptions() refreshes screen-reader-facing descriptions. GetZoomIndicatorText() returns formatted indicator text for any custom overlay or status element.