CasperJS Website Resolution Tester

casperjs-website-resolution-tester.js

var casper = require('casper').create({
    verbose: true,
    logLevel: 'info'
});
var page = require('webpage').create();
var utils = require('utils');

//args
var base = casper.cli.get('out');
var width = parseInt(casper.cli.get("width"));
var height = parseInt(casper.cli.get("height"));
var addr = casper.cli.get('addr');

//usage (if no args)
if(!width && !height && !base && !addr) {
    casper.log('Usage: casperjs resolution-test.js --width=[width] --height=[height] -addr=[webpage address] --out=[output base filename]', 'info');
    casper.exit();
}

//check args
if(isNaN(width)) {
    throw new Error('Missing width (--width)');
}
if(isNaN(height)) {
    throw new Error('Missing height (--height)');
}
if(!base) {
    throw new Error('Missing output file name (--output)');
}
if(!addr) {
    throw new Error('Missing address to test (--addr)');
}

var msg = utils.format('Taking screenshot from %s at %s x %s:', addr, width, height);
casper.log(msg, 'info');

page.viewportSize = { width: width, height: height };
page.clipRect = { top: 0, left: 0, width: width, height: height };
page.open(addr, function() {
    var filename = utils.format('%s.%sx%s.png', base, width, height);
    casper.log('Saving screenshot to: ' + filename, 'info');
    page.render(filename);
    phantom.exit();
});