Generate Puzzle

jigsawR unified API → generate puzzle.

Use When

• Create puzzle SVG w/ type + config
• Test generation w/ diff params
• Sample out for docs/demos
• ggplot2 puzzle viz w/ geom_puzzle_*()

In

• Required: type ("rectangular", "hexagonal", "concentric", "voronoi", "random", "snic")
• Required: grid (type-dep: c(cols, rows) or c(rings))
• Optional: size mm (default varies)
• Optional: seed (default 42)
• Optional: offset (0=interlocked, >0=separated)
• Optional: layout ("grid" or "repel" rect)
• Optional: fusion groups (PILES string)

Do

Step 1: Read config constraints

R_EXE="/mnt/c/Program Files/R/R-4.5.0/bin/Rscript.exe"
"$R_EXE" -e "cat(yaml::yaml.load_file('inst/config.yml')[['{TYPE}']]$grid$max)"

Or read inst/config.yml direct → valid ranges for type.

→ min/max for grid, size, tabsize known for type.

If err: config.yml missing or type key missing → in jigsawR root? pkg built once?

Step 2: Determine type + params

→ Req mapped to generate_puzzle() args, values in config.yml range.

If err: unsure format → see table. Rect + voronoi → c(cols, rows); hex + concentric → c(rings).

Step 3: Create R script

Script file preferred over -e for complex cmds.

library(jigsawR)

result <- generate_puzzle(
  type = "rectangular",
  seed = 42,
  grid = c(3, 4),
  size = c(400, 300),
  offset = 0,
  layout = "grid"
)

cat("Pieces:", length(result$pieces), "\n")
cat("SVG length:", nchar(result$svg_content), "\n")
cat("Files:", paste(result$files, collapse = ", "), "\n")

Save to tmp script file.

→ R script saved w/ library(jigsawR) + call + diag output.

If err: syntax → verify string quoting + c() for num vectors. Use script files, avoid shell escape.

Step 4: Execute via WSL R

R_EXE="/mnt/c/Program Files/R/R-4.5.0/bin/Rscript.exe"
"$R_EXE" /path/to/script.R

→ Completes no errors. SVG → output/.

If err: check renv restored (renv::restore()). Pkg loaded (devtools::load_all()). NO --vanilla (renv needs .Rprofile).

Step 5: Verify out

• SVG in output/
• Starts <?xml or <svg
• Piece count matches: cols × rows (rect), ring formula (hex/concentric)
• ggplot2 → plot renders no err

→ SVG exists, content valid, piece count matches.

If err: SVG missing → check output/ exists. Count wrong → verify grid for type. ggplot2 → wrap tryCatch().

Step 6: Save out

Default → output/. result contains:

• $svg_content — raw SVG string
• $pieces — piece data list
• $canvas_size — dims
• $files — paths

→ result has $svg_content, $pieces, $canvas_size, $files. Files on disk.

If err: $files empty → in-memory only. Explicitly: writeLines(result$svg_content, "output/puzzle.svg").

Check

• Script no err
• SVG well-formed XML
• Piece count matches grid
• Same seed → identical out
• Params in config.yml range

Traps

• --vanilla: breaks renv. Never.
• Complex -e: script files → shell escape → Exit 5.
• Grid vs size: grid=piece count, size=physical mm.
• Offset: 0=assembled, >0=exploded.
• SNIC: needs snic pkg installed.

→

• add-puzzle-type — scaffold new type E2E
• validate-piles-notation — validate fusion strings pre-call
• run-puzzle-tests — test suite after gen changes
• write-testthat-tests — tests for new scenarios