Vg — Declarative 2D vector graphics for OCaml
Vg is an OCaml module for declarative 2D vector graphics. In Vg, images are values that denote functions mapping points of the cartesian plane to colors. The module provides combinators to define and compose these values.
Renderers for PDF, SVG, Cairo and the HTML canvas are distributed with the module. An API allows to implement new renderers.
Vg depends only on Gg. The SVG renderer has no dependency, the PDF renderer depends on Uutf and Otfm, the HTML canvas renderer depends on js_of_ocaml, the Cairo renderer depends on cairo2. Vg and its renderers are distributed under the ISC license.
Home page: http://erratique.ch/software/vg
Contact: Daniel Bünzli
Vg can be installed with
opam install vg # SVG renderer only opam install uutf otfm js_of_ocaml cairo2 vg # all renderers
If you don't use
opam consult the
opam file for
build instructions and a complete specification of the dependencies.
The documentation and API reference is generated from the source
interfaces. It can be consulted online or via
odig doc vg.
Sample programs and images
If you install Vg with
opam sample programs are located in the
opam var vg:doc.
A database of sample images can be found in the
db directory of the
distribution. An online rendering of the database is available
Sample programs are located in the
test directory of the
distribution. They can be built and listed with:
topkg build --tests true && topkg test --list
min_pdf.native, minimal example to render an image to a PDF file.
min_svg.native, minimal example to render an image to an SVG file.
min_htmlc.byte, minimal example to render with the HTML canvas.
rsvg.native, renders images of the Vg image database to SVG files.
rpdf.native, renders images of the Vg image database to PDF files.
rcairo.native, renders images of the Vg image database with Cairo to PDF, PNG, PS or SVG files.
rhtmlc.bytecan be processed with
js_of_ocaml, the resulting webapp renders images of the Vg image database with the HTML canvas, PDF and SVG renderers.
vecho.native, like echo(1) but produces a PDF file on stdout, the font file can be specified, invoke with
fglyphs.native, renders a font's glyphs to a PDF file (without using Vg's glyph API).
- Daniel C. Bünzli, main developer.
- Arthur Wendling, Vgr_cairo backend.