Package draw2d is a pure [go](http://golang.org) 2D vector graphics library with support for multiple output devices such as [images](http://golang.org/pkg/image) (draw2d), pdf documents (draw2dpdf) and opengl (draw2dopengl), which can also be used on the google app engine. It can be used as a pure go [Cairo](http://www.cairographics.org/) alternative.
Operations in draw2d include stroking and filling polygons, arcs, Bézier curves, drawing images and text rendering with truetype fonts. All drawing operations can be transformed by affine transformations (scale, rotation, translation).
gc.MoveTo(10, 10) // should always be called first for a new path
gc.LineTo(100, 50)
gc.QuadCurveTo(100, 10, 10, 10)
gc.Close()
gc.FillStroke()
// Save to file
draw2dpdf.SaveToPdfFile(fn, dest)
```
There are more examples here: https://github.com/llgcode/draw2d.samples
Drawing on opengl is provided by the draw2dgl package.
Acknowledgments
---------------
[Laurent Le Goff](https://github.com/llgcode) wrote this library, inspired by [Postscript](http://www.tailrecursive.org/postscript) and [HTML5 canvas](http://www.w3.org/TR/2dcontext/). He implemented the image and opengl backend with the [freetype-go](https://code.google.com/p/freetype-go/) package. Also he created a pure go [Postscript interpreter](https://github.com/llgcode/ps), which can read postscript images and draw to a draw2d graphic context. [Stani Michiels](https://github.com/stanim) implemented the pdf backend with the [gofpdf](https://github.com/jung-kurt/gofpdf) package.