guoyu07 / g2-1

A 2d graphics command queue library.

g²

g² is a 2D graphics javascript library based on the command pattern principle. Its main goal is to provide a simple API for users who want to generate 2D web graphics occasionally. So the API is minimal and easy to understand. The library is tiny, fast and renderer agnostic.

Main features

• Fast and lightweight graphics command queue builder.
• Adressing HTML canvas 2D context as the default renderer.
• Generating SVG output using an addon library.
• Method chaining.
• Support of cartesian coordinates.
• Viewport pan and zoom transformations.
• Low level path commands with short names adopted from SVG.
• Higher level element commands.
• Maintaining a state stack for styling and transformations.
• Easy way to build custom symbol libraries.
• Tiny footprint by 5kB compressed (gzip).
• No dependency.

Minimal Example

<canvas id="c" width="200", height="100"></canvas>
<script src="g2.js"></script>
<script>
    g2().rec(40,30,120,40,{ls:"green",fs:"orange",lw:3})  // create g2 object and add rectangle with style.
        .exe(document.getElementById("c").getContext("2d"));  // draw to canvas.
</script>

Documentation

• Getting started
• Concepts
• Paths
• Elements
• State and Style
• Reuse
• View
• Animation
• Interactivity

API Reference

See the API Reference for details.

GitCDN

Use the link https://gitcdn.xyz/repo/goessner/g2/master/g2.min.js for getting the latest commit as a raw file.

In HTML use ...

<script src="https://gitcdn.xyz/repo/goessner/g2/master/g2.min.js"></script>

Cheat Sheet

Check out the single page Cheat Sheet.

License

g² is licensed under the terms of the MIT License.

#Change Log

2.2.5 - 2016-08-04

Added

• earc elliptical arc command added.

2.2.4 - 2016-07-01

Modified

• use command execution simplified.
• styling bug with g2.prototype.use removed.
• internal g2.prototype.addCmd simplified.

2.2.0 - 2016-06-20

Added

• g2.spline performing 'centripetal Catmull-Rom' interpolation.

Modified

• experimental g2.State.hatch fill style removed.
• g2.prototype.ply.iteratordefault iterators modified for improved efficiency and working also with splines.

2.1.1 - 2016-05-15

Modified

• g2.cor.js + g2.c2d.js => g2.js (reunited).
• g2.context namespace introduced.

2.1.0 - 2016-01-17

Added

• style argument for elements lin,rec,cir,arc,ply.
• style as first argument for stroke,fill and drw, optionally followed by a svg path definition string.

Changed

• State stack reimplemented.

1.1.0 - 2016-01-08

Added

CHANGELOG.md @goessner.