generate_proportional_svg: Generate an area-proportional SVG for a 2- or 3-set...

In vennDiagramLab: Headless Venn Diagram Analysis and Rendering

Generate an area-proportional SVG for a 2- or 3-set RegionResult

Description

Circle sizes and inter-circle distances are solved analytically (2-set, exact) or by triangulation (3-set, approximate) so that overlap areas match the requested intersection counts. The returned SVG matches the 44-model schema: ShapeA-I, NameA-I, Count_*, CountSUM_*, Bullet* elements are all present and addressable via xml2.

Usage

generate_proportional_svg(
  result,
  width = .PROP_DEFAULT_WIDTH,
  height = .PROP_DEFAULT_HEIGHT
)

Arguments

result	A ['RegionResult-class'].
width	Canvas width in pixels (default 600).
height	Canvas height in pixels (default 600).

Value

A 'character' (length 1) with the raw SVG.

Examples

tmp <- tempfile(fileext = ".tsv")
writeLines(c("Gene\tSetA\tSetB",
             "GENE1\t1\t0",
             "GENE2\t1\t1",
             "GENE3\t0\t1"), tmp)
ds  <- load_tsv(tmp, binary = TRUE)
res <- analyze(ds, model = "proportional")
svg <- generate_proportional_svg(res)
nchar(svg) > 0

vennDiagramLab documentation built on May 19, 2026, 1:07 a.m.