This example shows how you can set up tick marks to be a fixed density rather than a fixed number of tick marks. This is useful for implementing visualizations that can be resized by the user.
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January 24, 2017 17:00
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Density-based Ticks
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <meta charset="utf-8"> | |
| <title>Density-based Ticks</title> | |
| <style> | |
| .axis text { | |
| font: 16pt sans-serif; | |
| } | |
| .label { | |
| font: 24pt sans-serif; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 2px; | |
| shape-rendering: crispEdges; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script> | |
| var outerWidth = 950; | |
| var outerHeight = 500; | |
| var margin = { left: 80, top: 50, right: 500, bottom: 250 }; | |
| var xAxisLabelText = "Axis Label"; | |
| var xAxisLabelOffset = 55; | |
| var innerWidth = outerWidth - margin.left - margin.right; | |
| var innerHeight = outerHeight - margin.top - margin.bottom; | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", outerWidth) | |
| .attr("height", outerHeight); | |
| var g = svg.append("g") | |
| .attr("transform", "translate(" + margin.left + "," + margin.top + ")"); | |
| var xAxisG = g.append("g") | |
| .attr("class", "x axis") | |
| .attr("transform", "translate(0," + innerHeight + ")"); | |
| var xAxisLabel = g.append("text") | |
| .style("text-anchor", "middle") | |
| .attr("y", xAxisLabelOffset + innerHeight) | |
| .attr("class", "label") | |
| .text(xAxisLabelText); | |
| var xScale = d3.scaleLinear().domain([0, 1000]); | |
| var xAxis = d3.axisBottom().scale(xScale); | |
| var xPixelsPerTick = 70; | |
| function render(){ | |
| var time = Date.now() / 800; | |
| var varyingWidth = innerWidth + Math.sin(time) * 350; | |
| xAxis.ticks(varyingWidth / xPixelsPerTick); | |
| xAxisLabel.attr("x", varyingWidth / 2); | |
| xScale.range([0, varyingWidth]); | |
| xAxisG.call(xAxis); | |
| requestAnimationFrame(render); | |
| } | |
| render(); | |
| </script> | |
| </body> | |
| </html> |
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