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Adaptive Line Chart Scaling (D3.js v5)
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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <html> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| } | |
| div { | |
| padding-left: 50px; | |
| padding-top: 15px; | |
| width: 50%; | |
| margin: 0 auto; | |
| font: 14px; | |
| } | |
| input { | |
| border-top: 0; | |
| border-left: 0; | |
| border-right: 0; | |
| text-align: center; | |
| font: 14px; | |
| width: 60px; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #000; | |
| shape-rendering: crispEdges; | |
| } | |
| .x.axis path { | |
| display: none; | |
| } | |
| .line { | |
| fill: none; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <div> | |
| Number of Lines: | |
| <input id="linecount" name="lines" value="7" onkeyup="render()"></input> | |
| Points per Line: | |
| <input id="pointcount" name="points" value="3" onkeyup="render()"></input> | |
| </div> | |
| <script src="https://d3js.org/d3.v5.min.js"></script> | |
| <script> | |
| const width = 960; | |
| const height = 500; | |
| const margin = {top: 20, right: 20, bottom: 20, left: 50}; | |
| const svg = d3.select("body").append("svg") | |
| .attr("height", height).attr("width", width) | |
| .append("g") | |
| .attr("transform", `translate(${margin.left}, ${margin.right})`) | |
| const xScale = d3.scaleLinear() | |
| .range([0, width - margin.left - margin.right]); | |
| const yScale = d3.scaleLinear() | |
| .range([height - margin.top - margin.bottom, 0]); | |
| const line = d3.line() | |
| .x(d => xScale(d.x)) | |
| .y(d => yScale(d.y)) | |
| .curve(d3.curveMonotoneX); | |
| function newData(lineNumber, numPoints) { | |
| return d3.range(lineNumber).map(() => | |
| d3.range(numPoints).map((item, index) => | |
| ({x: index / (numPoints - 1), y: Math.random() * 100}) | |
| ) | |
| ); | |
| } | |
| function render(){ | |
| // generate new data | |
| const data = newData( | |
| +document.getElementById("linecount").value, | |
| +document.getElementById("pointcount").value | |
| ); | |
| // obtain absolute min and max | |
| const yMin = data.reduce((pv,cv) => { | |
| const currentMin = cv.reduce((pv,cv) => Math.min(pv,cv.y), 100); | |
| return Math.min(pv, currentMin); | |
| }, 100); | |
| const yMax = data.reduce((pv,cv) => { | |
| const currentMax = cv.reduce((pv,cv) => Math.max(pv,cv.y), 0) | |
| return Math.max(pv, currentMax); | |
| }, 0); | |
| // set domain for axis | |
| yScale.domain([yMin, yMax]); | |
| // create axis scale | |
| const yAxis = d3.axisLeft().scale(yScale); | |
| // if no axis exists, create one, otherwise update it | |
| if (svg.selectAll(".y.axis").empty()){ | |
| svg.append("g") | |
| .attr("class","y axis") | |
| .call(yAxis); | |
| } else { | |
| svg.selectAll(".y.axis") | |
| .transition().duration(1500) | |
| .call(yAxis); | |
| } | |
| // generate line paths | |
| const lines = svg.selectAll(".line") | |
| .data(data) | |
| .attr("class", "line"); | |
| // exit | |
| lines.exit() | |
| .remove(); | |
| // enter any new data | |
| lines.enter() | |
| .append("path") | |
| .attr("class", "line") | |
| .attr("d", line) | |
| .style("stroke", () => | |
| '#' + Math.floor(Math.random() * 16777215).toString(16) | |
| ) | |
| // Update new data | |
| .merge(lines) | |
| .transition().duration(1500) | |
| .attr("d", line) | |
| .style("stroke", () => | |
| '#' + Math.floor(Math.random() * 16777215).toString(16) | |
| ); | |
| // // transition from previous paths to new paths | |
| // lines.transition().duration(1500) | |
| // .attr("d",line) | |
| // .attr("stroke", () => | |
| // '#' + Math.floor(Math.random() * 16777215).toString(16) | |
| // ); | |
| } | |
| // initial page render | |
| render(); | |
| // continuous page render | |
| setInterval(render, 1500); | |
| </script> | |
| </body> | |
| </html> |
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