jdpigeon · June 4, 2020 20:22
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>d3.js | SVG paths</title>
    <script src="https://d3js.org/d3.v5.min.js"></script>
  </head>

  <body>
    <script>
      const w = 960,
        h = 500;

      // Just generate a randomly quivery line path
      const dataset = [];
      let lastPoint = { x: 10, y: 20 };
      for (let i = 0; i < 60; i++) {
        const x = lastPoint.x + Math.random() * 1;
        const y = lastPoint.y + Math.random() * 2;
        lastPoint = { x, y };
        dataset.push(lastPoint);
      }

      const xScale = d3
        .scaleLinear()
        // domain = range of our data values
        .domain([0, 100])
        // range = range of the pixel values we want data mapped to
        .range([0, w]);
      const yScale = d3.scaleLinear().domain([0, 100]).range([h, 0]);

      const lineFunction = d3
        .line()
        .x((d) => xScale(d.x))
        .y((d) => yScale(d.y));

      svgViewport = d3.select('body').append('svg').attr('width', w).attr('height', h);

      svgViewport
        .append('path')
        .datum(dataset)
        .attr('d', lineFunction)
        .attr('stroke', 'black')
        .attr('stroke-width', 3)
        .attr('fill', 'none')
        // Animation works by hiding the line with dash offset and lowering it to 0
        .attr('stroke-dasharray', w + ' ' + w)
        .attr('stroke-dashoffset', w)
        .transition()
        .attr('stroke-dashoffset', 0)
        .duration(3000)
        // There's a bunch of different easing functions here: https://github.com/d3/d3-ease
        .ease(d3.easeSin);
    </script>
  </body>
 </html>
	<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8" />
	<title>d3.js \| SVG paths</title>
	<script src="https://d3js.org/d3.v5.min.js"></script>
	</head>

	<body>
	<script>
	const w = 960,
	h = 500;

	// Just generate a randomly quivery line path
	const dataset = [];
	let lastPoint = { x: 10, y: 20 };
	for (let i = 0; i < 60; i++) {
	const x = lastPoint.x + Math.random() * 1;
	const y = lastPoint.y + Math.random() * 2;
	lastPoint = { x, y };
	dataset.push(lastPoint);
	}

	const xScale = d3
	.scaleLinear()
	// domain = range of our data values
	.domain([0, 100])
	// range = range of the pixel values we want data mapped to
	.range([0, w]);
	const yScale = d3.scaleLinear().domain([0, 100]).range([h, 0]);

	const lineFunction = d3
	.line()
	.x((d) => xScale(d.x))
	.y((d) => yScale(d.y));

	svgViewport = d3.select('body').append('svg').attr('width', w).attr('height', h);

	svgViewport
	.append('path')
	.datum(dataset)
	.attr('d', lineFunction)
	.attr('stroke', 'black')
	.attr('stroke-width', 3)
	.attr('fill', 'none')
	// Animation works by hiding the line with dash offset and lowering it to 0
	.attr('stroke-dasharray', w + ' ' + w)
	.attr('stroke-dashoffset', w)
	.transition()
	.attr('stroke-dashoffset', 0)
	.duration(3000)
	// There's a bunch of different easing functions here: https://github.com/d3/d3-ease
	.ease(d3.easeSin);
	</script>
	</body>
	</html>