diagrams-canvas

HTML5 canvas backend for diagrams drawing EDSL

https://diagrams.github.io/

LTS Haskell 24.66:	1.4.2@rev:2
Stackage Nightly 2026-11-12:	1.4.2.1
Latest on Hackage:	1.4.2.1

See all snapshots diagrams-canvas appears in

BSD-3-Clause licensed by Jeffrey Rosenbluth, Ryan Yates, Brent Yorgey, Andy Gill, Daniel Bergey

Maintained by [email protected]

This version can be pinned in stack with:diagrams-canvas-1.4.2.1@sha256:ebce310a6d54ee3d5aff25ece63d9d400a2259f99e2229f55b08090c6a480991,1809

Module documentation for 1.4.2.1

Diagrams
- Diagrams.Backend
  - Diagrams.Backend.Canvas
    - Diagrams.Backend.Canvas.CmdLine

Depends on 12 packages(full list with versions):

base, blank-canvas, containers, data-default, diagrams-core, diagrams-lib, lens, mtl, NumInstances, optparse-applicative, statestack, text

diagrams-canvas

diagrams-canvas is a canvas backend for diagrams based on the blank-canvas https://github.com/ku-fpg/blank-canvas package. Diagrams is a powerful, flexible, declarative domain-specific language for creating vector graphics, using the Haskell programming language. It supports most features defined in diagrams-lib.

Installation

cabal update && cabal install diagrams-canvas

Usage

A simple example that uses diagrams-canvas to draw a square.

import Diagrams.Prelude
import Diagrams.Backend.Canvas.CmdLine

b1 = (square 20 :: Diagram B) # lw 0.002

main = mainWith (pad 1.1 b1)

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

ghc --make -threaded Square.hs

This will generate an executable which, when run dispays the resulting diagrams to http://localhost:3000/

$ ./Square -w 750

Changes

v1.4.2.1 (2026-11-11)

Allow base-4.22, diagrams-lib-1.6, containers-0.8
Remove redundant cmdargs dep
Test on GHC 9.14
Drop support for GHC < 8.10
Fix new warnings

v1.4.2 (2024-10-30)

Require data-default-0.8
r1 (14 Apr 2025): allow base-4.21, diagrams-lib-1.5, test on GHC 9.12
r2 (14 Jun 2025): allow optparse-applicative-0.19

v1.4.1.2 (2023-06-22)

Allow base-4.18, optparse-applicative-0.18, and mtl-2.3
Test on GHC 9.6
Drop support for GHC < 8.8
r1 (15 January 2024): allow base-4.19, text-2.1, and test on GHC 9.8
r2 (18 September 2024): allow base-4.20, lens-5.3, containers-0.7, and test on GHC 9.10

v1.4.1.1 (2022-09-12)

allow base-4.17, lens-5.2, text-2.0
test on GHC 9.4

v1.4.1 (2018-05-09)

allow base-4.11
allow lens-4.16
Add Semigroup (Render Canvas V2 Double) instance
r1 (13 August 2021)
- Allow base-4.15, blank-canvas-0.7, lens-5.0, containers-0.6, statestack-0.3, optparse-applicative-0.16, diagrams-core-1.5
r3 (4 Feb 2022): allow optparse-applicative-0.17