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我试图渲染d3.js树形图树形图,并使用示例代码 - http://mbostock.github.com/d3/ex/treemap.html:D3.js - 从平面JSON层次
我遇到一个问题,我的源JSON是一个平坦的heirachy,因此调用treemap.nodes是错误的。
任何人都可以建议如何返回一个扁平的层次?
我的样品JSON:
[
{"ticker":"$GOOG","count":"82","sentiment":"9"},
{"ticker":"$AAPL","count":"408","sentiment":"8"}, ...
而且我完整的代码至今:
d3.json("/finance/data", function(json) {
var w = 960,
h = 500,
color = d3.interpolateRgb("rgb(0,255,0)", "rgb(255,0,0)");
//xcolor = d3.scale.linear().domain([-26,13]).range("rgb(0,255,0)", "rgb(255,0,0)"),
x = d3.scale.linear().domain([-26,13]).range([0, 1]),
stepsize = [2.46, 1.66],
minval = [-16.28, -16.67];
var treemap = d3.layout.treemap()
.size([w, h])
.sticky(true)
.value(function(d) { return d.count; });
var div = d3.select("#treemap-transition").append("div")
.style("position", "relative")
.style("width", w + "px")
.style("height", h + "px");
div.data([json]).selectAll("div")
.data(treemap.nodes)
.enter().append("div")
.attr("class", "cell")
.style("background", function(d) { return treemap_color(d.sentiment, 2.5, 10); })
.call(cell)
.attr("text-anchor", "middle")
.text(function(d) { return d.children ? null : d.ticker; });
function cell() {
this
.style("left", function(d) { return d.x + "px"; })
.style("top", function(d) { return d.y + "px"; })
.style("width", function(d) { return d.dx - 1 + "px"; })
.style("height", function(d) { return d.dy - 1 + "px"; })
.style("text-anchor", "middle");
}
function treemap_color(value, stepsize, steps) {
if (value == 0) {
return "rgb(0,0,0)";
} else if (value < 0) {
var x = Math.round((255/steps) * Math.abs(value/stepsize));
return 'rgb(0,' + x + ',0)'; //DECREASE in unemployment => green
} else {
var y = Math.round( (255/steps) * value/stepsize);
return 'rgb(' + y + ',0,0)'; //INCREASE in unemployment => red
}
}
});
欣赏任何评论。
谢谢,.data(treemap)我需要什么! – Ben 2012-04-23 12:46:14