javascript - Morris donut chart always start at 12 oclock (top middle) -


i using morris donut charts , want try , ensure segments start @ 12 o'clock there consistency when viewing multiple charts on same screen.

previously used jquery circliful https://github.com/pguso/jquery-plugin-circliful worked great quality fuzzy on retina screens checked out morris , want bar this.

i want looks first segment starts @ top middle:

circliful morris

does know how achieve this?

var donut= morris.donut({   element: 'donut-example',   data: [     {label: "new clients", value: 35},     {label: "in-store sales", value: 65}   ],   colors: ['#90c070', '#eeeeee'],   select :0    });  donut.select(0);

http://jsfiddle.net/0t976ez6/

no, far can tell source code, there's no api (public or private) in morris that. see donut's redraw() how renders chart: starts lowest point , goes in counterclockwise direction.

now, recommend consider switching other chart libraries, before proceeding. example there's d3.js — not simplest library out there, provides freedom anything, may hard work with. there a ton of examples of every thing think of. like, here's blog post creating similar looking donut charts using d3.

but hey, it's javascript, can patch things, nothing impossible!

warning: patching library code not best idea! must careful , when it's way.

the easiest (certainly not simplest) way monkey-patch morris.donut.redraw() start math.pi (middle top) , go in clockwise direction. that, initial value of last local variable should changed 0 math.pi , logic finds next starting point tweaked bit.

here's working example i've surrounded lines patched special patched comments:

/**   * careful: patched lib-function!   *   * in case of problems, see <a href="https://github.com/morrisjs/morris.js/blob/master/morris.js#l1894">original</a>   */  morris.donut.prototype.redraw = function() {    var c, cx, cy, i, idx, last, max_value, min, next, seg, total, value, w, _i, _j, _k, _len, _len1, _len2, _ref, _ref1, _ref2, _results;    this.raphael.clear();    cx = this.el.width() / 2;    cy = this.el.height() / 2;    w = (math.min(cx, cy) - 10) / 3;    total = 0;    _ref = this.values;    (_i = 0, _len = _ref.length; _i < _len; _i++) {      value = _ref[_i];      total += value;    }    min = 5 / (2 * w);    c = 1.9999 * math.pi - min * this.data.length;    // ------------ patched: start top    last = math.pi;    // original:    // last = 0    // ------------    idx = 0;    this.segments = [];    _ref1 = this.values;    (i = _j = 0, _len1 = _ref1.length; _j < _len1; = ++_j) {      value = _ref1[i];      // ------------ patched: change direction of rendering      next = last - min - c * (value / total);      seg = new morris.donutsegment(cx, cy, w * 2, w, next, last, this.data[i].color || this.options.colors[idx % this.options.colors.length], this.options.backgroundcolor, idx, this.raphael);      // original:      // next = last + min + c * (value / total);      // seg = new morris.donutsegment(cx, cy, w * 2, w, last, next, this.data[i].color || this.options.colors[idx % this.options.colors.length], this.options.backgroundcolor, idx, this.raphael);      // ------------      seg.render();      this.segments.push(seg);      seg.on('hover', this.select);      seg.on('click', this.click);      last = next;      idx += 1;    }    this.text1 = this.drawemptydonutlabel(cx, cy - 10, this.options.labelcolor, 15, 800);    this.text2 = this.drawemptydonutlabel(cx, cy + 10, this.options.labelcolor, 14);    max_value = math.max.apply(math, this.values);    idx = 0;    _ref2 = this.values;    _results = [];    (_k = 0, _len2 = _ref2.length; _k < _len2; _k++) {      value = _ref2[_k];      if (value === max_value) {        this.select(idx);        break;      }      _results.push(idx += 1);    }    return _results;  };    var donut = morris.donut({    element: 'donut-example',    data: [{      label: "in-store sales",      value: 55    }, {      label: "new clients",      value: 25    }, {      label: "reseller stores",      value: 20    }],    colors: ['#90c070', '#ee9090', '#9090ee'],    select: 0  });    donut.select(0);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>  <script src="https://rawgit.com/morrisjs/morris.js/master/morris.js"></script>  <script src="http://cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>  <link href="http://cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css" rel="stylesheet" />  <div id="donut-example" style="height: 250px;"></div>

of course, there's may way achieve same thing: maybe overlooked local variable changing sign of result in same rendering.


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