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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| </style> | |
| </head> | |
| <body> | |
| <svg id='waves'></svg> | |
| <script> | |
| const seaLevel = 100 // meters | |
| // const height = 10 // meters | |
| const speed = 10 // kilometers per hour | |
| // magic numbers | |
| const barWidth = 10 // pixels | |
| const svgWidth = 500 // pixels | |
| const svgHeight = 500 // pixels | |
| const xMargin = 0 | |
| const yMargin = svgHeight * 0.2 | |
| const waveBoxWidth = svgWidth - xMargin | |
| const waveBoxHeight = svgHeight - yMargin | |
| // create scale: meters to pixels | |
| const scaleY = d3.scaleLinear().domain([0, waveBoxHeight - yMargin]).range([0, seaLevel * 2]) | |
| // number of wave rectangles | |
| const numRects = (waveBoxWidth - xMargin) / barWidth | |
| const svg = d3.select('#waves') | |
| .attr('width', svgWidth) | |
| .attr('height', svgHeight) | |
| .append("g") | |
| ///////////////////////////////// | |
| const height = scaleY(seaLevel) | |
| const low = scaleY(seaLevel - height) | |
| const high = scaleY(seaLevel + height) | |
| const bar = svg.selectAll('rect') | |
| .data([...new Array(numRects)]) | |
| .enter().append("rect") | |
| .attr('fill', 'blue') | |
| .attr('opacity', 0.7) | |
| .attr('x', (d,i) => i * barWidth + xMargin) | |
| .attr('width', barWidth) | |
| .attr('y', waveBoxHeight) | |
| .attr('height', 0) | |
| .transition() | |
| .ease(d3.easeQuad) | |
| .duration(1000) | |
| .delay((d,i) => i * 20) | |
| .on("start", function repeat() { | |
| d3.active(this) | |
| .attr('y', waveBoxHeight - high) | |
| .attr('height', high) | |
| .transition() | |
| .attr('y', waveBoxHeight - low) | |
| .attr('height', low) | |
| .transition() | |
| .on("start", repeat); | |
| }); | |
| </script> | |
| </body> |
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