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Monthly Downloads: 54
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Graphics     Diagrams    
Latest version: v1.4.1

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README

diagrams-html5

diagrams-html5 is an HTML5 Canvas backend for diagrams based on the static-canvas https://github.com/jeffreyrosenbluth/static-canvas package.

diagrams is a powerful, flexible, declarative domain-specific language for creating vector graphics, using the Haskell programming language.

Installation

cabal update && cabal install diagrams-html5

Usage

A simple example that uses diagrams-html5 to draw a the Sierpinski triangle.

Sierpinksi

import Diagrams.Prelude
import Diagrams.Backend.Html5.CmdLine

sierpinski 1 = eqTriangle 1
sierpinski n =     s
                  ===
               (s ||| s) # centerX
  where s = sierpinski (n-1)

example :: Diagram B
example = sierpinski 7 # center # lw none # fc black

main = mainWith $ example # frame 0.1

Save this to file named Sierpinski.hs and compile this program:

ghc Sierpinski.hs

This will generate an executable which, when run creates an html file containing the HTML5 Canvas code to generate the diagram.

$ ./Sierpinski -o sierpinski.html -w 400

You must pass an output file name with a .html extension.

Usage: ./Sierpinksi [-w|--width WIDTH] [-h|--height HEIGHT] [-o|--output OUTPUT] [--loop] [-s|--src ARG] [-i|--interval INTERVAL]
  Command-line diagram generation.

Available options:
  -?,--help                Show this help text
  -w,--width WIDTH         Desired WIDTH of the output image
  -h,--height HEIGHT       Desired HEIGHT of the output image
  -o,--output OUTPUT       OUTPUT file
  -l,--loop                Run in a self-recompiling loop
  -s,--src ARG             Source file to watch
  -i,--interval INTERVAL   When running in a loop, check for changes every INTERVAL seconds.