v1.0.0

[1.0.0] — 2026

Added

• plot_ldt() — main public API: EULUMDAT .ldt → SVG polar diagram
• Layout dataclass — all visual parameters in one place
• Layout.for_size(n) — proportional scaling from 1181 px reference
• make_svg() — low-level SVG renderer, decoupled from LDT parsing
• polar_to_nat() — polar to NAT Cartesian coordinate conversion
• svg_to_png() / svg_to_jpg() — raster export via vl-convert-python
  (cross-platform, no native DLL required)
• Optional I(γ) resampling: linear (numpy) and cubic spline (scipy)
• Dynamic radial scale: 3–6 concentric circles with round values
• Dominant-hemisphere detection for automatic scale label placement
• Debug mode: colour-coded C-planes for visual validation
• SVG clip path: curves and grid clipped to the plot area
• Smoke tests: 46 real EULUMDAT files, all ISYM types (0–4)
• Scaling tests: proportionality and pixel-exact PNG export

Architecture

• plot.py — LDT reading and C-plane extraction via eulumdat-py;
  ISYM handling fully delegated to pyldt.LdtReader
• renderer.py — pure SVG generation, no LDT dependency
• export.py — raster export, lazy dependency loading