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July 4, 2018 08:41
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Horizontal axis with major and minor ticks using d3 version 4.
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<!-- | |
Source: https://gist.github.com/erikvullings/41be28677574fd484b43e91413a7e45d | |
Preview: https://bl.ocks.org/erikvullings/41be28677574fd484b43e91413a7e45d | |
--> | |
<!DOCTYPE html> | |
<head> | |
<meta charset="utf-8"> | |
<script src="https://d3js.org/d3.v4.min.js"></script> | |
<style> | |
body { | |
font: 10px sans-serif; | |
} | |
.axis text { | |
font-size: 1.5em; | |
} | |
.axis line { | |
shape-rendering: crispEdges; | |
stroke: #000; | |
stroke-width: 3px; | |
} | |
/* Below, we set the tick length to 10px. The stroke-dasharray only displays 6px to create a minor tick effect. */ | |
.axis .minor line { | |
stroke: #777; | |
stroke-width: 1px; | |
stroke-dasharray: 6,4; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="block"></div> | |
<script> | |
function drawAxis(margin, width, height, data, selector) { | |
// Clear any existing content | |
d3.select(selector).selectAll("*").remove(); | |
// Helper function, to check whether we are dealing with a major or minor tick. | |
// Minor ticks have the class 'minor' attached to them, and no text label. | |
var isMajorTick = function (index) { | |
return ticks[index].isVisible; | |
} | |
var svg = d3.select(selector) | |
.append("svg") | |
.attr("width", width) | |
.attr("height", height); | |
// Only keep the values | |
var tickValues = ticks.map( function(t) { return t.value; }); | |
// How much pixels are available for displaying the axis | |
var dx = width - margin.right - margin.left; | |
// x position: map the input domain (tickValues) to the output range (pixels) | |
var xScale = d3.scaleLinear() | |
.domain([tickValues[0], tickValues[tickValues.length - 1]]) | |
.range([margin.left, dx]); | |
// create the x-axis, where the ticks have length 10px, and a padding (space) for the text of 5px. Use the tickValues as ticks, and only render text for major ticks. | |
var xAxis = d3.axisBottom(xScale) | |
.tickSize(10) | |
.tickPadding(5) | |
.tickValues(tickValues) | |
.tickFormat(function (d, i) { | |
return isMajorTick(i) ? d : ""; | |
}); | |
var x_axis = svg.append("g") | |
.attr("id", "x_axis") | |
.attr("class", "x axis") | |
.attr("transform", "translate(0, " + height / 2 + ")") | |
.call(xAxis) | |
// Add the class 'minor' to all minor ticks | |
x_axis.selectAll("g") | |
.filter(function (d, i) { | |
return !isMajorTick(i); | |
}) | |
.classed("minor", true); | |
// console.log("all the visible points", xAxis.scale().ticks(xAxis.ticks()[0])); | |
} | |
// dimensions | |
var margin = { | |
top: 20, | |
right: 20, | |
bottom: 30, | |
left: 40 | |
}; | |
var width = 500; | |
var height = 60; | |
var ticks = []; | |
for (var i = 0; i <= 100; i += 2.5) { | |
ticks.push( { value: i, isVisible: i % 10 === 0 }); | |
} | |
drawAxis(margin, width, height, ticks, "#block"); | |
</script> | |
</body> |
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