所以我知道这个答案是为了隐藏不适合图表的文字:D3 put arc labels in a Pie Chart if there is enough space
但我无法弄清楚如何将其引入下面的代码中。我已经编辑了这段代码,因此您只能在查看时看到第二个内圈。但即使这样,许多标签也没有足够的空间来适应各自的切片。所以我想添加更多逻辑,只是为了检查文本是否合适。
或者更简单的是,如果切片不占据整个圆圈的至少10%的分区,则隐藏它。
这是JS小提琴:
http://jsfiddle.net/P79kX/ 这不是一个完美的JSFiddle,它并没有完全反映我的代码。但概念是一样的,检查边界框。
以下是代码:
var width = 840,
height = width,
radius = width / 2,
x = d3.scale.linear().range([0, 2 * Math.PI]),
y = d3.scale.pow().exponent(1.3).domain([0, 1]).range([0, radius]),
padding = 5,
duration = 1000;
var div = d3.select("#chart_render");
div.select("img").remove();
var vis = div.append("svg")
.attr("width", width + padding * 2)
.attr("height", height + padding * 2)
.append("g")
.attr("transform", "translate(" + [radius + padding, radius + padding] + ")");
var partition = d3.layout.partition()
.sort(null)
.value(function(d) { return d.size });
var arc = d3.svg.arc()
.startAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x))); })
.endAngle(function(d) { return Math.max(0, Math.min(2 * Math.PI, x(d.x + d.dx))); })
.innerRadius(function(d) { return Math.max(0, d.y ? y(d.y) : d.y); })
.outerRadius(function(d) { return Math.max(0, y(d.y + d.dy)); });
d3.json("/js/wheel.json", function(error, json) {
console.log(json);
var nodes = partition.nodes({children: json});
var path = vis.selectAll("path").data(nodes);
path.enter().append("path")
.attr("id", function(d, i) { return "path-" + i; })
.attr("d", arc)
.attr("fill-rule", "evenodd")
.style("fill", colour)
.on("click", click);
var text = vis.selectAll("text").data(nodes);
var textEnter = text.enter().append("text")
.style("fill-opacity", function(d) {
if (d.depth > 2) {
return '0';
} else {
return '1';
}
})
.style("fill", function(d) {
return "#fff";
})
.attr("text-anchor", function(d) {
return x(d.x + d.dx / 2) > Math.PI ? "end" : "start";
})
.attr("dy", ".2em")
.attr("transform", function(d) {
var multiline = (d.name || "").split(" ").length > 1,
angle = x(d.x + d.dx / 2) * 180 / Math.PI - 90,
rotate = angle + (multiline ? -.5 : 0);
return "rotate(" + rotate + ")translate(" + (y(d.y) + padding) + ")rotate(" + (angle > 90 ? -180 : 0) + ")";
})
.on("click", click);
textEnter.append("tspan")
.attr("x", 0)
.text(function(d) { return d.depth ? d.name.split(" ")[0] : ""; });
textEnter.append("tspan")
.attr("x", 0)
.attr("dy", "1em")
.text(function(d) { return d.depth ? d.name.split(" ")[1] || "" : ""; });
function click(d) {
path.transition()
.duration(duration)
.attrTween("d", arcTween(d));
// Somewhat of a hack as we rely on arcTween updating the scales.
text.style("visibility", function(e) {
return isParentOf(d, e) && e.depth < d.depth + 2 ? null : d3.select(this).style("visibility");
})
.transition()
.duration(duration)
.attrTween("text-anchor", function(d) {
return function() {
return x(d.x + d.dx / 2) > Math.PI ? "end" : "start";
};
})
.attrTween("transform", function(d) {
var multiline = (d.name || "").split(" ").length > 1;
return function() {
var angle = x(d.x + d.dx / 2) * 180 / Math.PI - 90,
rotate = angle + (multiline ? -.5 : 0);
return "rotate(" + rotate + ")translate(" + (y(d.y) + padding) + ")rotate(" + (angle > 90 ? -180 : 0) + ")";
};
})
.style("fill-opacity", function(e) { return isParentOf(d, e) ? 1 : 1e-6; })
.each("end", function(e) {
d3.select(this).style("visibility", isParentOf(d, e) && e.depth < d.depth + 2 ? null : "hidden");
});
}
});
function isParentOf(p, c) {
if (p === c) return true;
if (p.children) {
return p.children.some(function(d) {
return isParentOf(d, c);
});
}
return false;
}
function colour(d) {
if (d.depth == 0) {
return "rgb(250, 250, 250)";
} else if (d.depth == 1) {
return 'rgb(86, 135, 209)';
} else if (d.depth == 2) {
return 'rgb(222, 120, 59)';
} else if (d.depth == 3) {
return 'rgb(106, 185, 117)';
}
// if (d.children) {
// // There is a maximum of two children!
// var colours = d.children.map(colour),
// a = d3.hsl(colours[0]),
// b = d3.hsl(colours[1]);
// // L*a*b* might be better here...
// return d3.hsl((a.h + b.h) / 2, a.s * 1.2, a.l / 1.2);
// }
// return d.colour || "#fff";
}
// Interpolate the scales!
function arcTween(d) {
var my = maxY(d),
xd = d3.interpolate(x.domain(), [d.x, d.x + d.dx]),
yd = d3.interpolate(y.domain(), [d.y, my]),
yr = d3.interpolate(y.range(), [d.y ? 20 : 0, radius]);
return function(d) {
return function(t) { x.domain(xd(t)); y.domain(yd(t)).range(yr(t)); return arc(d); };
};
}
function maxY(d) {
return d.children ? Math.max.apply(Math, d.children.map(maxY)) : d.y + d.dy;
}
// http://www.w3.org/WAI/ER/WD-AERT/#color-contrast
function brightness(rgb) {
return rgb.r * .299 + rgb.g * .587 + rgb.b * .114;
}