Created
April 6, 2017 13:48
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making some circles and lines in d3
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<!DOCTYPE html> | |
<style> | |
button { | |
position: absolute; | |
top: 10px; | |
left: 10px; | |
} | |
circle { | |
fill: none; | |
stroke: #000; | |
stroke-width: 2px; | |
} | |
</style> | |
<div id="mychart"></div> | |
<svg width="960" height="500"></svg> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<script> | |
var svg = d3.select("svg");//, | |
// margin = {top: 30, right: 30, bottom: 30, left: 30}, | |
// width = +svg.attr("width") - margin.left - margin.right, | |
// height = +svg.attr("height") - margin.top - margin.bottom, | |
// g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
width = svg.attr('width'); | |
height = svg.attr('height'); | |
var pts = []; | |
for (var i = 0; i < 10; i++) { | |
pts.push({x:Math.random() * width, | |
y:Math.random() * height, | |
r:5}); | |
} | |
function update(pts) { | |
xx = pts.map(function(a) {return a.x;}); | |
yy = pts.map(function(a) {return a.y;}); | |
var svg = d3.select("svg"); | |
// DATA JOIN | |
var vline = svg.selectAll("line-vert").data(xx); | |
var hline = svg.selectAll("line-vert") | |
.data(yy) | |
.enter() | |
.append("line") | |
.attr("x1", 0) | |
.attr("x2", width) | |
.attr("y1", function(d){return d;}) | |
.attr("y2", function(d){return d;}) | |
.attr("stroke", "red") | |
.attr("stroke-width", 2); | |
vline.enter() | |
.append("line") | |
.attr("x1", function(d){return d}) | |
.attr("x2", function(d){return d}) | |
.attr("y1", 0) | |
.attr("y2", height) | |
.attr("stroke", "red") | |
.attr("stroke-width", 2) | |
.merge() | |
var circ = svg.selectAll("circle") | |
.data(pts) | |
.enter() | |
.append("circle") | |
.attr("cx", function(d){return d.x}) | |
.attr("cy", function(d){return d.y}) | |
.attr("r", function(d){return d.r}); | |
}; | |
update(pts); | |
</script> |
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