Refresh stale depth bounds after geometry edits, allow orbiting through camera poles, and preserve hidden-line occlusion for selected solids.\n\nFixes #957
Model space appearance now follows the active UI theme instead of a
hardcoded dark background. Canvas mode is user-selectable (Match Theme /
Classic CAD Dark / Custom RGB), with matching controls for the paper
sheet and desk surround backgrounds and grid opacity.
Implements industry-standard CAD system variables, all settable via
command name, SETVAR, and the Options dialog:
- COLORTHEME (0/1 dark/light UI scheme, preserves custom palettes)
- COLORSCHEME (interactive named-theme selection)
- BACKGROUND (THEME/CLASSIC/DEFAULT/DESK presets, RGB triplets)
- SELECTIONAREA, SELECTIONAREAOPACITY (translucent marquee fill)
- WINDOWSAREACOLOR/WINDOWAREACOLOR, CROSSINGAREACOLOR (ACI or theme)
- SELECTIONEFFECT, SELECTIONEFFECTCOLOR (GPU highlight pass, driven by
selection_generation invalidation — no retessellation)
- SELECTIONPREVIEW (bit 0 = idle rollover, bit 1 = in-command hover)
- GRIPSIZE, GRIPCOLOR, GRIPHOT, GRIPHOVER (grip overlay styling)
parse_power accepted a single exponent (`unary ('^' unary)?`), so a
chained power stopped after the first `^`. The remaining `^2` was left
unconsumed, and eval_to_string's embedded-expression scan then handed it
back as literal text: typing `2^3^2` into a coordinate or distance field
produced the string "8^2" rather than 512, and `2^3^2+1" produced "8^3".
Recurse into parse_power for the exponent so `2^3^2` reads as
`2^(3^2)", the standard right-associative meaning, and the whole
expression is consumed.
DIMAUNIT 4 is Surveyor's units, but format_angular_value matched only
0-3 and let 4 fall through the catch-all to decimal degrees. An angular
dimension in a drawing authored with surveyor units therefore read as
plain degrees, while AUNITS 4 in the same drawing writes a bearing for
the coordinate readout — the two disagreed on one angle.
Format the bearing from the dimension's own DMS path so it carries
DIMADEC, DIMAZIN and DIMDSEP, quantise before picking the quadrant so a
value just short of a cardinal does not quote a quarter turn, and offer
the option in the dimension-style dialog.
The Properties panel reads and writes ACAD_DSTYLE overrides for all three
dimension colours (DIMCLRD 176, DIMCLRE 177, DIMCLRT 178), but the
renderer consulted the override only for DIMCLRD and took DIMCLRE/DIMCLRT
straight from the dimension style. Editing 'Text color' on a dimension
therefore showed the new colour in the panel while the drawing kept
rendering the inherited style colour — which for the common
DIMCLRT = ByLayer default is the layer colour. (#898)
Route all three through one helper so the renderer and the panel read the
same value.
format_engineering split feet from inches before rounding to DIMDEC, so a
remainder that rounds up to a full foot printed out of range: 35.999" at
two decimals read 2'-12.00" instead of 3'-0.00". A magnitude that rounded
away to zero also kept a lone minus sign.
Round on the decimal grid first and split afterwards, matching the carry
handling already used by format_architectural and format_fractional.
ramox81