How to install

install-cairo.sh

port install cairo

node-canvas-example.js

/**
 * Module dependencies.
 */

var Canvas = require('canvas')
  , canvas = new Canvas(150, 150)
  , ctx = canvas.getContext('2d')
  , fs = require('fs');

ctx.fillRect(0,0,150,150);   // Draw a rectangle with default settings
ctx.save();                  // Save the default state

ctx.fillStyle = '#09F'       // Make changes to the settings
ctx.fillRect(15,15,120,120); // Draw a rectangle with new settings

ctx.save();                  // Save the current state
ctx.fillStyle = '#FFF'       // Make changes to the settings
ctx.globalAlpha = 0.5;    
ctx.fillRect(30,30,90,90);   // Draw a rectangle with new settings

ctx.restore();               // Restore previous state
ctx.fillRect(45,45,60,60);   // Draw a rectangle with restored settings

ctx.restore();               // Restore original state
ctx.fillRect(60,60,30,30);   // Draw a rectangle with restored settings

var out = fs.createWriteStream(__dirname + '/state.png')
  , stream = canvas.createPNGStream();

stream.on('data', function(chunk){
  out.write(chunk);
});

node-canvas.js

npm install canvas