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// d3.legend.js
// (C) 2012 ziggy.jonsson.nyc@gmail.com
// MIT licence
(function() {
d3.legend = function(g, clicked) {
g.each(function() {
var g = d3.select(this),
items = {},
svg = d3.select(g.property("nearestViewportElement")),
legendPadding = g.attr("data-style-padding") || 5,
lb = g.selectAll(".legend-box").data([true]),
li = g.selectAll(".legend-items").data([true]);
lb.enter().append("rect").classed("legend-box", true);
li.enter().append("g").classed("legend-items", true);
svg.selectAll("[data-legend]").each(function() {
var self = d3.select(this);
items[self.attr("data-legend")] = {
pos: self.attr("data-legend-pos") || this.getBBox().y,
color: self.attr("data-legend-color") != undefined ? self.attr("data-legend-color") : self.style("fill") != 'none' ? self.style("fill") : self.style("stroke")
};
});
items = d3.entries(items).sort(function(a, b) {
return a.value.pos - b.value.pos;
});
li.selectAll("text")
.data(items, function(d) { return d.key; })
.call(function(d) { d.enter().append("text"); })
.call(function(d) { d.exit().remove(); })
.attr("y", function(d, i) { return i + "em"; })
.attr("x", "1em")
.text(function(d) { return d.key; });
li.selectAll("circle")
.data(items, function(d) { return d.key; })
.call(function(d) { d.enter().append("circle"); })
.call(function(d) { d.exit().remove(); })
.attr("cy", function(d, i) { return i - 0.25 + "em"; })
.attr("cx", 0)
.attr("r", "4px")
.style("stroke", function(d) { return d.value.color; })
.style("stroke-width", "1px")
.style("stroke-opacity", 0.8)
.style("fill", function(d) { return d.value.color; })
.on("click", function(d) {
var curve = d3.selectAll("[data-legend='" + d.key + "']");
var state = (curve.style("display") == "none")
? "block" : "none";
curve.style("display", state);
d3.select(this).style(
"fill", (state == "none") ? "none" : d.value.color
);
});
// Reposition and resize the box
var lbbox = li[0][0].getBBox();
lb.attr("x", (lbbox.x - legendPadding))
.attr("y", (lbbox.y - legendPadding))
.attr("height", (lbbox.height + 2 * legendPadding))
.attr("width", (lbbox.width + 2 * legendPadding));
});
return g;
};
})();