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g.pie.js
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/*
* g.Raphael 0.4 - Charting library, based on Raphaël
*
* Copyright (c) 2009 Dmitry Baranovskiy (http://g.raphaeljs.com)
* Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license.
*/
Raphael.fn.g.piechart = function (cx, cy, r, values, opts) {
opts = opts || {};
var paper = this,
sectors = [],
covers = this.set(),
chart = this.set(),
series = this.set(),
order = [],
len = values.length,
angle = 0,
total = 0,
others = 0,
cut = 9,
defcut = true;
chart.covers = covers;
if (len == 1) {
series.push(this.circle(cx, cy, r).attr({fill: this.g.colors[0], stroke: opts.stroke || "#fff", "stroke-width": opts.strokewidth == null ? 1 : opts.strokewidth}));
covers.push(this.circle(cx, cy, r).attr(this.g.shim));
total = values[0];
values[0] = {value: values[0], order: 0, valueOf: function () { return this.value; }};
series[0].middle = {x: cx, y: cy};
series[0].mangle = 180;
} else {
function sector(cx, cy, r, startAngle, endAngle, fill) {
var rad = Math.PI / 180,
x1 = cx + r * Math.cos(-startAngle * rad),
x2 = cx + r * Math.cos(-endAngle * rad),
xm = cx + r / 2 * Math.cos(-(startAngle + (endAngle - startAngle) / 2) * rad),
y1 = cy + r * Math.sin(-startAngle * rad),
y2 = cy + r * Math.sin(-endAngle * rad),
ym = cy + r / 2 * Math.sin(-(startAngle + (endAngle - startAngle) / 2) * rad),
res = ["M", cx, cy, "L", x1, y1, "A", r, r, 0, +(Math.abs(endAngle - startAngle) > 180), 1, x2, y2, "z"];
res.middle = {x: xm, y: ym};
return res;
}
for (var i = 0; i < len; i++) {
total += values[i];
values[i] = {value: values[i], order: i, valueOf: function () { return this.value; }};
}
values.sort(function (a, b) {
return b.value - a.value;
});
for (var i = 0; i < len; i++) {
if (defcut && values[i] * 360 / total <= 1.5) {
cut = i;
defcut = false;
}
if (i > cut) {
defcut = false;
values[cut].value += values[i];
values[cut].others = true;
others = values[cut].value;
}
}
len = Math.min(cut + 1, values.length);
others && values.splice(len) && (values[cut].others = true);
for (var i = 0; i < len; i++) {
var mangle = angle - 360 * values[i] / total / 2;
if (!i) {
angle = 90 - mangle;
mangle = angle - 360 * values[i] / total / 2;
}
if (opts.init) {
var ipath = sector(cx, cy, 1, angle, angle - 360 * values[i] / total).join(",");
}
var path = sector(cx, cy, r, angle, angle -= 360 * values[i] / total);
var p = this.path(opts.init ? ipath : path).
attr( this.g.mergeoptions( {fill: opts.colors && opts.colors[i] || this.g.colors[i] || "#666",
stroke: opts.stroke || "#fff",
"stroke-width": (opts.strokewidth == null ? 1 : opts.strokewidth),
"stroke-linejoin": "round"
},
opts.sector_attr)
);
p.value = values[i];
p.middle = path.middle;
p.mangle = mangle;
sectors.push(p);
series.push(p);
opts.init && p.animate({path: path.join(",")}, (+opts.init - 1) || 1000, ">");
}
for (var i = 0; i < len; i++) {
var p = paper.path(sectors[i].attr("path")).attr(this.g.mergeoptions(this.g.shim, opts.cover_attr));
opts.href && opts.href[i] && p.attr({href: opts.href[i]});
p.attr = function () {};
covers.push(p);
series.push(p);
}
}
chart.update = function (newvalues) {
}
chart.hover = function (fin, fout) {
fout = fout || function () {};
var that = this;
for (var i = 0; i < len; i++) {
(function (sector, cover, j) {
var o = {
sector: sector,
cover: cover,
cx: cx,
cy: cy,
mx: sector.middle.x,
my: sector.middle.y,
mangle: sector.mangle,
r: r,
value: values[j],
total: total,
label: that.labels && that.labels[j]
};
cover.mouseover(function () {
fin.call(o);
}).mouseout(function () {
fout.call(o);
});
if (opts.hover_legend) {
that.labels[j].mouseover(function () {
fin.call(o);
}).mouseout(function () {
fout.call(o);
});
}
})(series[i], covers[i], i);
}
return this;
};
// x: where label could be put
// y: where label could be put
// value: value to show
// total: total number to count %
chart.each = function (f) {
var that = this;
for (var i = 0; i < len; i++) {
(function (sector, cover, j) {
var o = {
sector: sector,
cover: cover,
cx: cx,
cy: cy,
x: sector.middle.x,
y: sector.middle.y,
mangle: sector.mangle,
r: r,
value: values[j],
total: total,
label: that.labels && that.labels[j]
};
f.call(o);
})(series[i], covers[i], i);
}
return this;
};
chart.click = function (f) {
var that = this;
for (var i = 0; i < len; i++) {
(function (sector, cover, j) {
var o = {
sector: sector,
cover: cover,
cx: cx,
cy: cy,
mx: sector.middle.x,
my: sector.middle.y,
mangle: sector.mangle,
r: r,
value: values[j],
total: total,
label: that.labels && that.labels[j]
};
cover.click(function () { f.call(o); });
})(series[i], covers[i], i);
}
return this;
};
chart.inject = function (element) {
element.insertBefore(covers[0]);
};
var legend = function (labels, otherslabel, mark, dir) {
var x = cx + r + r / 5,
y = cy,
h = y + 10;
labels = labels || [];
dir = (dir && dir.toLowerCase && dir.toLowerCase()) || "east";
mark = paper.g.markers[mark && mark.toLowerCase()] || "disc";
chart.labels = paper.set();
for (var i = 0; i < len; i++) {
var clr = series[i].attr("fill"),
j = values[i].order,
txt;
values[i].others && (labels[j] = otherslabel || "Others");
labels[j] = paper.g.labelise(labels[j], values[i], total);
chart.labels.push(paper.set());
chart.labels[i].push(paper.g[mark](x + 5, h, 5).attr({fill: clr, stroke: "none"}));
chart.labels[i].push(txt = paper.text(x + 20, h, labels[j] || values[j]).attr(paper.g.txtattr).attr(
paper.g.mergeoptions(
{fill: opts.legendcolor || "#000", "text-anchor": "start"},
opts.legend_attr
)));
covers[i].label = chart.labels[i];
h += txt.getBBox().height;
opts.href && opts.href[i] && txt.attr({href: opts.href[i]});
}
var bb = chart.labels.getBBox(),
tr = {
east: [0, -bb.height / 2],
west: [-bb.width - 2 * r - 20, -bb.height / 2],
north: [-r - bb.width / 2, -r - bb.height - 10],
south: [-r - bb.width / 2, r + 10]
}[dir];
chart.labels.translate.apply(chart.labels, tr);
chart.push(chart.labels);
};
if (opts.legend) {
legend(opts.legend, opts.legendothers, opts.legendmark, opts.legendpos);
}
chart.push(series, covers);
chart.series = series;
chart.covers = covers;
return chart;
};