Some Go packages that some people may find useful.

canvas

An experimental package for drawing and manipulating graphical widgets. Based on exp/draw, exp/draw/x11 and freetype-go.googlecode.com/freetype/raster. Still in its very early stages.

Install with: goinstall rog-go.googlecode.com/hg/canvas

values

Multiple-reader, multiple-writer, typed values. Designed for notification in a GUI environment. Install with: goinstall rog-go.googlecode.com/hg/values

cmd/bounce

A command that bounces balls inside a window. Each ball represents a single goroutine. Use button 1 to draw lines for the balls to bounce off, button 2 to create new balls, and button 3 to delete a ball. There's a slider at the top level that allows the update interval to be changed.

Build with:

    goinstall rog-go.googlecode.com/hg/x11
    cd $GOROOT/src/pkg/rog-go.googlecode.com/hg/cmd/bounce
    make

cmd/hello

A simple(ish) program to display some text and allow the user to drag it around.

Build with:

    goinstall rog-go.googlecode.com/hg/x11
    cd $GOROOT/src/pkg/rog-go.googlecode.com/hg/cmd/hello
    make

cmd/shape

Play with the freetype rasterization code. Click with button 1 to start a new shape; further button clicks add more points to the shape. Button 2 makes the new point part of a curve (once for quadratic, twice for cubic). Button 3 ends the curve. Once a curve has been completed, the points on the curve may be dragged to change the shape.

Build with:

    goinstall rog-go.googlecode.com/hg/x11
    cd $GOROOT/src/pkg/rog-go.googlecode.com/hg/cmd/shape
    make