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| license: mit |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <style> | |
| path {fill: none;stroke: #000;stroke-width: 3px;} | |
| circle {fill: steelblue;stroke: #fff;stroke-width: 1px;} | |
| </style> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script> | |
| const width = 200 | |
| const height = 200 | |
| const radius = 5 | |
| const topLeftX = 130 | |
| const topLeftY = 130 | |
| const stepDistance = 2 | |
| const redrawInterval = 30 | |
| var data = []; | |
| var point_count = 10; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| .attr("color", "red") | |
| const rnd = d3.randomUniform(1, 10) | |
| d3.range(point_count).map(i=> { | |
| data.push({ | |
| id: i, x:topLeftX, y:topLeftY, | |
| //x: boxLeft, y: boxTop, | |
| slope: rnd() / 10, | |
| x_dir: 1,y_dir: 1, | |
| }) | |
| }) | |
| redraw(data); | |
| d3.interval(() => redraw(update(data)), redrawInterval) | |
| function redraw(data){ | |
| var circle = svg.selectAll("circle") | |
| .data(data, d => d.id) | |
| circle | |
| .attr("r", radius) | |
| .attr("cx", d => d.x) | |
| .attr("cy", d => d.y) | |
| circle.enter().append("circle") | |
| .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 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) | |
| const rndDeviation = d3.randomUniform(-1,1) | |
| const calcPointB = (p, d, m) => { | |
| p.x += rndDeviation() | |
| p.y += rndDeviation() | |
| p.x_dir = getDir(p.x, p.x_dir, width, topLeftX); | |
| p.y_dir = getDir(p.y, p.y_dir, height,topLeftY); | |
| 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> |
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