Points could only render as a 1px dot — no way to change PDMODE/PDSIZE.
- PDMODE / PDSIZE commands set the header value and rebuild the glyphs.
- DDPTYPE opens a Point Style dialog: a 5x4 grid of rendered glyphs
(shape x enclosure), a size field, and relative/absolute radios.
- Relative (<=0) PDSIZE now sizes from the current world-per-pixel so the
marker stays a roughly constant on-screen size across zoom, rebuilding
on zoom via the existing camera-generation cache key. Absolute (>0)
scales with the world as before. Switching to absolute with a zero size
seeds a positive value from the on-screen size so it stays representable.
Part of the #100 extensibility epic (point style surfaced in #106).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
