in AzureCT/ServerSide/DisplayAvailability.js [489:498]
LineChart.prototype.transformContext = function () {
var context = this.context;
// move context to center of canvas
this.context.translate(this.x, this.y + this.height);
// invert the y scale so that that increments
// as you move upwards
context.scale(1, -1);
};