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Non-rectangular clip reigion support basically works

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2024-10-29 16:41:57 -06:00
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docfx/docs/drawing.md
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@@ -41,6 +41,12 @@ Each of these steps can be overridden by developers using the standard [Terminal
If a View need to redraw because something changed within it's Content Area it can call @Terminal.Gui.View.SetNeedsDraw. If a View needs to be redrawn because something has changed the size of the Viewport, it can call @Terminal.Gui.View.SetNeedsLayout.
### Clipping
Clipping enables better performance by ensuring on regions of the terminal that need to be drawn actually get drawn by the @Terminal.Gui.ConsoleDriver. Terminal.Gui supports non-rectangular clip regions with @Terminal.Gui.Region. @Terminal.Gui.ConsoleDriver.Clip is the application managed clip region and is managed by @Terminal.Gui.Application. Developers cannot change this directly.
The View drawing APIs, e.g. @Terminal.Gui.View.OnDrawingSubviews, are passed the clip region currently enforced in Viewport-relative coordinates.
## Coordinate System for Drawing
The @Terminal.Gui.View draw APIs all take coordinates specified in *Viewport-Relative* coordinates. That is, `0, 0` is the top-left cell visible to the user.