Creating mouse events

mousemove.js

phantom.casperPath = '/Users/npow/Downloads/dev/casperjs';
phantom.injectJs(phantom.casperPath + '/bin/bootstrap.js');

var casper = require('casper').create();
casper.on('remote.message', function(message) { console.log(message); });
casper.start("http://localhost:8888/charts/TrendLineTest.htm", function () {
  // setup here
});

casper.then(function () {
  this.mouse.click(150, 150);
  this.evaluate(function () {
    var e = document.createEvent('MouseEvents');
    e.initMouseEvent('mousemove', true, true, window, 1, 400, 400, 400, 400);
    var canvas = document.getElementById('trendLine');
    canvas.dispatchEvent(e);
  });
  casper.capture('ss1.png');
});
casper.run();