javascript - How can I hide tick marks on Chart.js? -

i'm trying hide tick marks in x , y axes, marked them arrows... ideas? i've tried cannot find solution.

snapshot of problem:

it's easier clearing out tick marks after have been drawn. can extending chart.

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preview

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script

chart.types.line.extend({     name: "linealt",     initialize: function () {         chart.types.line.prototype.initialize.apply(this, arguments);          var scale = this.scale;         var originaldraw = scale.draw;         scale.draw = function () {             originaldraw.apply(this, arguments);             ctx.clearrect(scale.calculatex(0), scale.endpoint, scale.width, 5);             ctx.clearrect(scale.calculatex(0), scale.endpoint + 1, -5, -scale.height);         }     } }); 

and then

... new chart(ctx).linealt(data); 

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fiddle - http://jsfiddle.net/m9k5goal/