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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <style> | |
| path {fill: none;stroke: #000;stroke-width: 3px;} | |
| circle {fill: steelblue;stroke: #fff;stroke-width: 1px;} | |
| sink {} | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", 900) | |
| .attr("height", 600) | |
| .attr("class", "sink") | |
| const radius = 5 | |
| const stepDistance = 5 | |
| const redrawInterval = 40 | |
| var data = [] | |
| const faucet = [[71, 64],[119, 95],[130, 139]] | |
| const vacuum = [[391, 64],[344, 95],[335, 139]] | |
| const tub = [[75, 120],[75, 200], | |
| [370, 200], [370,120]] | |
| let liquidHeight = 50 | |
| let surfaceY = tub[0][1]+ liquidHeight | |
| const topLeft = [tub[0][0],surfaceY] | |
| const rightBottom = [370,200] | |
| const faucetPath = svg.append("path") | |
| .data([faucet]) | |
| .attr("d", d3.line().curve(d3.curveCardinal)) | |
| const vacuumPath = svg.append("path") | |
| .data([vacuum]) | |
| .attr("d", d3.line().curve(d3.curveCardinal)) | |
| svg.append("path") | |
| .data([tub]) | |
| .attr("d", d3.line()) | |
| const translateAlong = path => { | |
| const l = path.getTotalLength() ; | |
| return (d, i, a) => t => { | |
| const p = path.getPointAtLength(t * l) | |
| return `translate(${p.x},${p.y})`; | |
| }; | |
| } | |
| const initPoints = (pointCount) => { | |
| const rnd = d3.randomUniform(1, 10) | |
| d3.range(pointCount).map(i=> { | |
| data.push({ | |
| id: i, x:topLeft[0], y:topLeft[1], | |
| slope: rnd() / 10, | |
| x_dir: 1,y_dir: 1, | |
| state:0 | |
| }) | |
| }) | |
| } | |
| initPoints(5) | |
| const rndDelay = d3.randomUniform(500, 1500) | |
| redraw(data); | |
| d3.interval(() => redraw(update(data)), redrawInterval) | |
| function redraw(data){ | |
| var circle = svg.selectAll("circle") | |
| .data(data) | |
| circle.enter().append("circle") | |
| .attr("r", radius) | |
| .transition() | |
| .ease(d3.easeQuad) | |
| .delay(rndDelay) | |
| .duration(2000) | |
| .attrTween("transform", translateAlong(faucetPath.node())) | |
| .on("end", d => { | |
| const lastP = faucet[2] | |
| d.state = 1 | |
| d.x = lastP[0] | |
| d.y = lastP[1] | |
| }) | |
| circle.filter(d => d.state == 1) | |
| .attr("transform","translate(0,0)") | |
| .attr("r", radius) | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y) | |
| } | |
| const update = data => | |
| data.map(d => calcPointB(d, stepDistance, d.slope)) | |
| const calcPointB = (p, d, m) => { | |
| const getDir = (coord, dir, maxCood, minCoord) => | |
| (Math.ceil(coord) <= minCoord + radius) ? 1 : | |
| (Math.ceil(coord) >= maxCood - radius) ? -1 : dir | |
| const sqrt = Math.sqrt | |
| const pow2 = a=>Math.pow(a, 2) | |
| p.x_dir = getDir(p.x, p.x_dir, rightBottom[0], topLeft[0]); | |
| p.y_dir = getDir(p.y, p.y_dir, rightBottom[1], surfaceY); | |
| p.x = p.x + | |
| (d * sqrt(1 / (1 + pow2(m))) * p.x_dir) | |
| p.y = p.y + | |
| (m * d * sqrt(1 / (1 + pow2(m))) * p.y_dir); | |
| return p; | |
| } | |
| </script> | |
| </body> | |
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