我正试图在此图表中补间各种弧线的高度
的jsfiddle http://jsfiddle.net/0ht35rpb/193/
我见过这个例子，但不知道如何开始实现它。
d3 how to tween inner radius for pie chart
我在各种补间数学上看过这个样本。 http://andyshora.com/tweening-shapes-paths-d3-js.html
var $this = $("#chart");
var data = [{
"label": "Overall Stress",
"value": 89
},{
"label": "Emotional Stress",
"value": 1
},{
"label": "Behavioural difficulties",
"value": 29
},{
"label": "hyperactivity and concetration",
"value": 89
},{
"label": "Getting along with others",
"value": 19
},{
"label": "Keen and helpful behaviour",
"value": 45
}];
var w = 350;
var h = 350;
function colores_google(n) {
var colores_g = ["#f7b363", "#448875", "#c12f39", "#2b2d39", "#f8dd2f", "#c12fff"];
return colores_g[n % colores_g.length];
}
var arcGenerator = {
radius: 70,
oldData: "",
init: function(el, data, w, h){
var stardata = [
{
"segments": data
}
];
this.el = el;
var clone = $.extend(true, {}, stardata);
this.oldData = this.setData(clone, false);
this.setup(el, this.setData(stardata, true), w, h);
},
update: function(data){
var clone = $.extend(true, {}, data);
this.animate(this.setData(data, true));
this.oldData = this.setData(clone, false);
},
animate: function(data){
var that = this;
var chart = d3.select(this.el);
that.generateArcs(chart, data);
},
setData: function(data, isSorted){
var diameter = 2 * Math.PI * this.radius;
var localData = new Array();
var displacement = 0;
var oldBatchLength = 0;
$.each(data, function(index, value) {
var riseLevels = value.segments;
var riseLevelCount = riseLevels.length;
if(oldBatchLength !=undefined){
displacement+=oldBatchLength;
}
var arcBatchLength = 2*Math.PI;
var arcPartition = arcBatchLength/riseLevelCount;
$.each(riseLevels, function( ri, value ) {
var startAngle = (ri*arcPartition);
var endAngle = ((ri+1)*arcPartition);
if(index!=0){
startAngle+=displacement;
endAngle+=displacement;
}
riseLevels[ri]["startAngle"] = startAngle;
riseLevels[ri]["endAngle"] = endAngle;
});
oldBatchLength = arcBatchLength;
localData.push(riseLevels);
});
var finalArray = new Array();
$.each(localData, function(index, value) {
$.each(localData[index], function(i, v) {
finalArray.push(v);
});
});
return finalArray;
},
generateArcs: function(chart, data){
var that = this;
//_arc paths
//append previous value to it.
$.each(data, function(index, value) {
if(that.oldData[index] != undefined){
data[index]["previousEndAngle"] = that.oldData[index].endAngle;
}
else{
data[index]["previousEndAngle"] = 0;
}
});
var arcpaths = that.arcpaths.selectAll("path")
.data(data);
arcpaths.enter().append("svg:path")
.style("fill", function(d, i){
return colores_google(i);
})
.transition()
.ease(d3.easeElastic)
.duration(750)
.attrTween("d", arcTween);
arcpaths.transition()
.ease(d3.easeElastic)
.style("fill", function(d, i){
return colores_google(i);
})
.duration(750)
.attrTween("d",arcTween);
arcpaths.exit().transition()
.ease(d3.easeBounce)
.duration(750)
.attrTween("d", arcTween)
.remove();
function arcTween(b) {
var prev = JSON.parse(JSON.stringify(b));
prev.endAngle = b.previousEndAngle;
var i = d3.interpolate(prev, b);
return function(t) {
return that.getArc()(i(t));
};
}
//_arc paths
var r = that.radius + 40;
var ir = that.radius - 30;
var legendHeight = this.legendPaddingTop;
var ySpace = 18;
var labelPadding = 3;
//draw labels legends
var labels = that.label_group.selectAll("text.labels")
.data(data);
labels.enter().append("svg:text")
.attr("class", "labels")
.attr("dy", function(d, i) {
legendHeight+=ySpace;
return (ySpace * i) + labelPadding;
})
.attr("text-anchor", function(d) {
return "start";
})
.text(function(d) {
return d.label;
});
labels.exit().remove();
var legend = that.legend_group.selectAll("circle").data(data);
legend.enter().append("svg:circle")
.attr("cx", 100)
.attr("cy", function(d, i) {
return ySpace * i;
})
.attr("r", 7)
.attr("width", 18)
.attr("height", 18)
.style("fill", function(d, i) {
return colores_google(i);
});
legend.exit().remove();
//reset legend height
//console.log("optimum height for legend", legendHeight);
$this.find('.legend').attr("height", legendHeight);
/*
//__labels
var starlabels = that.starlabels.selectAll("text")
.data(data);
starlabels.enter()
.append("text")
.attr("text-anchor", "middle")
starlabels.text(function(d) {
return d.label;
})
.each(function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
d.cx = Math.cos(a) * (ir+((r-ir)/2));
d.cy = Math.sin(a) * (ir+((r-ir)/2));
d.x = d.x || Math.cos(a) * (r + 20);
d.y = d.y || Math.sin(a) * (r + 20);
var bbox = this.getBBox();
d.sx = d.x - bbox.width/2 - 2;
d.ox = d.x + bbox.width/2 + 2;
d.sy = d.oy = d.y + 5;
})
.transition()
.duration(300)
.attr("x", function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
return d.x = Math.cos(a) * (r + 20);
})
.attr("y", function(d) {
var a = d.startAngle + (d.endAngle - d.startAngle)/2 - Math.PI/2;
return d.y = Math.sin(a) * (r + 20);
});
starlabels.exit().remove();
//__labels
//__pointers
that.pointers.append("defs").append("marker")
.attr("id", "circ")
.attr("markerWidth", 6)
.attr("markerHeight", 6)
.attr("refX", 3)
.attr("refY", 3)
.append("circle")
.attr("cx", 3)
.attr("cy", 3)
.attr("r", 3)
.style("fill", "#005a70");
var pointers = that.pointers.selectAll("path.pointer")
.data(data);
pointers.enter()
.append("path")
.attr("class", "pointer")
.style("fill", "none")
.style("stroke", "#005a70")
.attr("marker-end", "url(#circ)");
pointers
.transition()
.duration(300)
.attr("d", function(d) {
if(d.cx > d.ox) {
return "M" + d.sx + "," + d.sy + "L" + d.ox + "," + d.oy + " " + d.cx + "," + d.cy;
} else {
return "M" + d.ox + "," + d.oy + "L" + d.sx + "," + d.sy + " " + d.cx + "," + d.cy;
}
});
pointers.exit().remove();
//__pointers
*/
},
setup: function(el, data, w, h){
var chart = d3.select(el).append("svg")
.attr("class", "chart")
.attr("width", w)
.attr("height", h)
var arcchart = chart.append("g")
.attr("class", "starchart")
.attr("transform", "translate("+w/4+","+h/2+")");
this.arcpaths = arcchart.append("g")
.attr("class", "arcpaths");
this.starlabels = arcchart.append("g")
.attr("class", "labels");
this.pointers = arcchart.append("g")
.attr("class", "pointer");
var margin = 25;
var padding = 15;
this.legendPaddingTop = 30;
var legend = chart.append("g")
.attr("class", "legend")
.attr("width", w/3)
.attr("height", h - 50)
.attr("transform", "translate(" + (w-20) + "," + (h/4) + ")");
this.label_group = legend.append("g")
.attr("class", "label_group")
.attr("transform", "translate(" + (-(w / 3) + 20) + "," + 0 + ")");
this.legend_group = legend.append("g")
.attr("class", "legend_group")
.attr("transform", "translate(" + (-(w / 3) - 100) + "," + 0 + ")");
var radiusControl = 16;
this.dataset = "big";//more than 2 results
if(data.length <=2){
radiusControl = 65;//make the radius smaller to compromise with there being less results
this.dataset = "small";
}
this.radius = w/4 - radiusControl;
this.generateArcs(chart, data);
},
getArc: function(){
var that = this;
var arc = d3.arc()
.innerRadius(function(d, i){
var threshold = 50;
if(that.dataset == "small"){
threshold = 20;
}
return that.radius-threshold;//negative makes it deeper
})
.outerRadius(function(d){
var maxHeight = 120;
var ratio = (d.value/maxHeight * 100)+that.radius;
return ratio;
})
.startAngle(function(d, i){
return d.startAngle;
})
.endAngle(function(d, i){
return d.endAngle;
});
return arc;
}
}
arcGenerator.init($this[0], data, w, h);
答案 0 :(得分：2)
在attrTween函数中，而不是插值角度插值：
function arcTween(b) {
var prev = JSON.parse(JSON.stringify(b));
prev.endAngle = b.previousEndAngle; <-- incorrect
var i = d3.interpolate(prev, b);
插入外半径，如下所示
function arcTween(b) {
var prev = JSON.parse(JSON.stringify(b));
prev.value = 0;
var i = d3.interpolate(prev, b);
工作代码here