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document some editor constants

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Kartik K. Agaram 2023-06-07 21:30:17 -07:00
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reference.md
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@ -231,6 +231,25 @@ locations in the widget are `cursor1` describing where text is inserted or
deleted and `screen_top1` which specifies how far down the lines is currently
visible on screen.
Some constants that affect editor behavior:
* `Margin_top`, `Margin_left`, `Margin_right` are integers in pixel units that
affect where the editor is drawn on window (it always extends to bottom of
window as needed)
* `Drawing_padding_top` and `Drawing_padding_bottom` affect spacing around
drawings.
* Various color constants are represented as tables with r/g/b keys:
* `Text_color`, `Cursor_color`, `Highlight_color` for drawing text.
* `Stroke_color`, `Current_stroke_color` for line drawings.
* `Icon_color` affects the color of the little mode icon on the top right of
a drawing.
* `Current_name_background_color` manages the color when naming points using
`ctrl+n`.
* `Focus_stroke_color` affects the color of a point or line when you hover
over it.
* `Help_color` and `Help_background_color` affect the color of online help
within line drawings.
### clickable buttons
There's a facility for rendering buttons and responding to events when they're