Created
July 7, 2019 19:23
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Demo of making a D3 chart
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<title>Hello!</title> | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
</head> | |
<body> | |
This space intentionally left blank. Test | |
<div class="container"> | |
<svg class="graph"></svg> | |
</div> | |
<script src="https://unpkg.com/d3"></script> | |
<script> | |
var svg = d3.select(".graph"); | |
svg.attr("width", 120) | |
.attr("height", 100); | |
var data = [1, 2, 3]; | |
//margin pattern: https://bl.ocks.org/mbostock/3019563 | |
var chartSize = { | |
x: 30, | |
y: 10, | |
width: 70, | |
height: 70 | |
}; | |
//https://www.d3indepth.com/scales/ | |
var xScale = d3.scaleLinear() | |
.domain([0, data.length]) | |
.range([0, chartSize.width]); | |
var min = Math.min(...data); | |
var max = Math.max(...data); | |
if (min > 0) min = 0; | |
var yScale = d3.scaleLinear() | |
.domain([min, max]) | |
.range([chartSize.height, 0]); | |
var xAxis = d3.axisBottom() | |
.scale(xScale) | |
.ticks(4); | |
var yAxis = d3.axisLeft() | |
.ticks(5) | |
// .tickFormat(d => d) | |
.scale(yScale); | |
svg | |
.append("g") | |
.attr("transform", `translate(${chartSize.x}, ${chartSize.y + chartSize.height})`) | |
.call(xAxis); | |
svg | |
.append("g") | |
.attr("transform", `translate(${chartSize.x}, ${chartSize.y})`) | |
.call(yAxis); | |
//enter-exit:https://medium.com/@c_behrens/enter-update-exit-6cafc6014c36 | |
svg.selectAll("rect") | |
.data(data) | |
.enter() | |
.append("rect") | |
.attr("x", (_, i) => chartSize.x + xScale(i) + 1) | |
.attr("y", d => chartSize.y + yScale(d)) | |
.attr("height", d => chartSize.height - yScale(d)) | |
.attr("width", xScale(1) - 2); | |
</script> | |
</body> | |
</html> |
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