Last active
December 16, 2015 14:00
-
-
Save xriss/640126818e3320733622 to your computer and use it in GitHub Desktop.
chartjs v2 - bartop controller that displays value at top of bar chart using y axis formating
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
(function() { | |
"use strict"; | |
var root = this, | |
Chart = root.Chart, | |
helpers = Chart.helpers; | |
Chart.defaults.bartop = helpers.extendDeep({},Chart.defaults.bar); | |
Chart.controllers.bartop = function(chart, datasetIndex) { | |
this.initialize.call(this, chart, datasetIndex); | |
}; | |
helpers.extend(Chart.controllers.bartop.prototype,Chart.controllers.bar.prototype,{ | |
draw: function(ease) { | |
var easingDecimal = ease || 1; | |
helpers.each(this.getDataset().metaData, function(rectangle, index) { | |
rectangle.transition(easingDecimal).draw(); | |
}, this); | |
var ctx=this.chart.chart.ctx; | |
var ticks=this.chart.scales["y-axis-0"]; // is this a safe way to get the yaxis? | |
var options=ticks.options; | |
var labelFont = helpers.fontString(options.ticks.fontSize, options.ticks.fontStyle, options.ticks.fontFamily); | |
ctx.font = labelFont; | |
ctx.fillStyle = options.ticks.fontColor; | |
helpers.each(this.getDataset().metaData, function(rectangle, index) { | |
var value=this.getDataset().data[index]; | |
var vm = rectangle._view; | |
var top = vm.base - (vm.base - vm.y); | |
var text=options.ticks.callback(value, index, ticks); | |
ctx.save(); | |
ctx.font = labelFont; | |
ctx.textAlign = "center"; | |
ctx.textBaseline = "bottom" ; | |
ctx.fillText(text, vm.x, top); | |
ctx.restore(); | |
}, this); | |
}, | |
}); | |
}).call(this); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment