使用d3.js的javascript极地散点图 [英] javascript polar scatter plot using d3.js
本文介绍了使用d3.js的javascript极地散点图的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试像这样一个简单的极坐标散点图： http://helpcentral.componentone.com/NetHelp/SpreadNet6/WF/artwork/plottypes-polar-point2.png
I'm trying to do a simple polar scatter plot like this one : http://helpcentral.componentone.com/NetHelp/SpreadNet6/WF/artwork/plottypes-polar-point2.png
我找到答案使用D3.js的极坐标图，但我无法显示点而不是d3.svg.line.radial。
如何将行更改为点？
I found that answer Polar plots using D3.js but I cannot display the points instead of d3.svg.line.radial. How do I change the line to points?
推荐答案
如果您使用 d3 .svg.line.radial（）生成极坐标图，一个简单的解决方案是解析生成的路径以获取点坐标，然后在这些坐标处添加一个圆：
If you are using the d3.svg.line.radial() to generate you polar plot, one easy solution would be to parse the generated path to get point coordinates, then add a circle at those coordinates:
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
svg.selectAll("point")
.data(data)
.enter()
.append("circle")
.attr("class", "point")
.attr("transform", function(d) {
// use the line function and parse out the coordinates
var coors = line([d]).slice(1).slice(0, -1);
return "translate(" + coors + ")"
})
.attr("r", 8);
以下是一个完整的工作示例：
Here's a full working example:
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.frame {
fill: none;
stroke: #000;
}
.axis text {
font: 10px sans-serif;
}
.axis line,
.axis circle {
fill: none;
stroke: steelblue;
stroke-dasharray: 4;
}
.axis:last-of-type circle {
stroke: steelblue;
stroke-dasharray: none;
}
.line {
fill: none;
stroke: orange;
stroke-width: 3px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500,
radius = Math.min(width, height) / 2 - 30;
var r = d3.scale.linear()
.domain([0, 1])
.range([0, radius]);
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var gr = svg.append("g")
.attr("class", "r axis")
.selectAll("g")
.data(r.ticks(3).slice(1))
.enter().append("g");
gr.append("circle")
.attr("r", r);
var ga = svg.append("g")
.attr("class", "a axis")
.selectAll("g")
.data(d3.range(0, 360, 30))
.enter().append("g")
.attr("transform", function(d) {
return "rotate(" + -d + ")";
});
ga.append("line")
.attr("x2", radius);
var color = d3.scale.category20();
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
var data = [
[Math.PI / 3, Math.random()],
[Math.PI / 6, Math.random()],
[0 * Math.PI, Math.random()],
[(11 * Math.PI) / 6, Math.random()],
[(5 * Math.PI / 3), Math.random()],
[(3 * Math.PI) / 2, Math.random()],
[(4 * Math.PI / 3), Math.random()],
[(7 * Math.PI) / 6, Math.random()],
[Math.PI, Math.random()],
[(5 * Math.PI) / 6, Math.random()],
[(2 * Math.PI) / 3, Math.random()],
[Math.PI / 2, Math.random()]
]
svg.selectAll("point")
.data(data)
.enter()
.append("circle")
.attr("class", "point")
.attr("transform", function(d) {
var coors = line([d]).slice(1).slice(0, -1);
return "translate(" + coors + ")"
})
.attr("r", 8)
.attr("fill",function(d,i){
return color(i);
});
</script>
或者，你可以用一点三角法来做：
Alternatively, you could do it with a little trigonometry:
.attr("transform", function(d) {
// get angle and radius
var an = d[0],
ra = r(d[1]),
x = ra * Math.cos(an * Math.PI / 180),
y = ra * Math.sin(an * Math.PI / 180);
return "translate(" + [x, y] + ")";
})
运行代码：
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.frame {
fill: none;
stroke: #000;
}
.axis text {
font: 10px sans-serif;
}
.axis line,
.axis circle {
fill: none;
stroke: steelblue;
stroke-dasharray: 4;
}
.axis:last-of-type circle {
stroke: steelblue;
stroke-dasharray: none;
}
.line {
fill: none;
stroke: orange;
stroke-width: 3px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var width = 960,
height = 500,
radius = Math.min(width, height) / 2 - 30;
var r = d3.scale.linear()
.domain([0, 1])
.range([0, radius]);
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
var gr = svg.append("g")
.attr("class", "r axis")
.selectAll("g")
.data(r.ticks(3).slice(1))
.enter().append("g");
gr.append("circle")
.attr("r", r);
var ga = svg.append("g")
.attr("class", "a axis")
.selectAll("g")
.data(d3.range(0, 360, 30))
.enter().append("g")
.attr("transform", function(d) {
return "rotate(" + -d + ")";
});
ga.append("line")
.attr("x2", radius);
var color = d3.scale.category20();
var line = d3.svg.line.radial()
.radius(function(d) {
return r(d[1]);
})
.angle(function(d) {
return -d[0] + Math.PI / 2;
});
var data = [
[Math.PI / 3, Math.random()],
[Math.PI / 6, Math.random()],
[0 * Math.PI, Math.random()],
[(11 * Math.PI) / 6, Math.random()],
[(5 * Math.PI / 3), Math.random()],
[(3 * Math.PI) / 2, Math.random()],
[(4 * Math.PI / 3), Math.random()],
[(7 * Math.PI) / 6, Math.random()],
[Math.PI, Math.random()],
[(5 * Math.PI) / 6, Math.random()],
[(2 * Math.PI) / 3, Math.random()],
[Math.PI / 2, Math.random()]
]
svg.selectAll("point")
.data(data)
.enter()
.append("circle")
.attr("class", "point")
.attr("transform", function(d) {
// get angle and radius
var an = d[0],
ra = r(d[1]),
x = ra * Math.cos(an),
y = ra * Math.sin(an);
return "translate(" + [x, y] + ")";
})
.attr("r", 8)
.attr("fill",function(d,i){
return color(i);
});
</script>
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