Javascript 用数组数据绘制圆弧
我可以这样画一条弧:Javascript 用数组数据绘制圆弧,javascript,d3.js,svg,Javascript,D3.js,Svg,我可以这样画一条弧: this.arc = D3['arc']() .innerRadius(200) .outerRadius(250) .startAngle(0) .endAngle(Math.PI); this.canvas = D3.select("#simpleChart").append("svg") .attr("width", Number((self.data[this.site
this.arc = D3['arc']()
.innerRadius(200)
.outerRadius(250)
.startAngle(0)
.endAngle(Math.PI);
this.canvas = D3.select("#simpleChart").append("svg")
.attr("width", Number((self.data[this.site].w + 50)))
.attr("height", Number((this.data[this.site].h + 50)))
.attr("style", "outline: thin solid red;");
let arcTest = this.canvas.append('g')
.attr('class', 'testtest');
arcTest.append('path')
.attr('d', this.arc);
但是,我尝试绑定数据以绘制多个圆弧,但无法使其工作:
let p = Math.PI * 2
let arcData = [
[{
startAngle: 0,
endAngle: 1.25
}],
[{
startAngle: 2,
endAngle: 3.25
}]
] //i also tried it with just an array of obj [{},{}]
this.arc = D3['arc']()
.innerRadius(200)
.outerRadius(250)
.startAngle(function(d) {
return d.startAngle
})
.endAngle(function(d) {
return d.endAngle
});
let arcTest = this.canvas.append('g')
.attr('class', 'testtest')
.attr('transform', 'translate(200,200)');
arcTest.selectAll(".entranceArc")
.data(this.arcData)
.attr("d", this.arc)
.enter()
.append("path")
.attr('class', 'entranceArc')
.attr("fill", "none")
.attr("stroke", "black");
我缺少什么?您必须在添加路径后设置
d
属性
因此,不是:
arcTest.selectAll(".entranceArc")
.data(this.arcData)
.attr("d", this.arc)
.enter()
.append("path")
.attr('class', 'entranceArc')
.attr("fill", "none")
.attr("stroke", "black");
应该是:
arcTest.selectAll(".entranceArc")
.data(this.arcData)
.enter()
.append("path")
.attr("d", this.arc)
.attr('class', 'entranceArc')
.attr("fill", "none")
.attr("stroke", "black");
下面是一个演示:
设p=Math.PI*2
设arcData=[{
startAngle:0,
端角:1.25
}, {
startAngle:2,
端角:3.25
}];
设arc=d3.arc()
.内半径(100)
.外层(150)
.startAngle(功能(d){
返回d.startAngle
})
.端角(功能(d){
返回d.端角
});
让svg=d3.select(“body”)
.append(“svg”)
.attr(“宽度”,400)
.attr(“高度”,400);
让group=svg.append(“g”)
.attr(“转换”、“翻译(200200)”)
让arcTest=group.selectAll(“.enterArc”)
.数据(arcData)
.输入()
.append(“路径”)
.attr(“d”,弧)
.attr('类','入口弧')
.attr(“填充”、“无”)
.attr(“笔划”、“黑色”)代码>