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October 4, 2019 01:46
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| license: mit |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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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> | |
| <script> | |
| console.clear() | |
| let height = 800 | |
| let width = height | |
| let margin = 50 | |
| let noOfCircles = 75 | |
| let sineData = d3.range(0, 101).map(function(k) { | |
| let freq = 0.05 | |
| var value = [freq * k * Math.PI, Math.sin(freq * k * Math.PI)]; | |
| return value; | |
| }); | |
| let sineX = d3.scaleLinear() | |
| .domain([-1, 1]) | |
| .range([0, width]) | |
| let sineY = d3.scaleLinear() | |
| .domain(d3.extent(sineData, function(d) { | |
| return d[0] | |
| })) | |
| .range([0, height]) | |
| let line = d3.line() | |
| .x(function(d) { | |
| return sineX(d[1]); | |
| }) | |
| .y(function(d) { | |
| return sineY(d[0]); | |
| }) | |
| .curve(d3.curveLinear) | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width + margin + margin) | |
| .attr("height", height + margin + margin) | |
| var g = svg.append('g') | |
| .attr('transform', 'translate(' + margin + ',' + margin + ')') | |
| var sinePath = g.append('path') | |
| .datum(sineData) | |
| .attr('d', line) | |
| .style('stroke', 'black') | |
| .style('stroke-width', 1) | |
| .style('fill', 'none') | |
| let node = sinePath.node() | |
| let pathLength = Math.floor(node.getTotalLength()) | |
| var circleX = function(i){ | |
| return node.getPointAtLength(i).x | |
| } | |
| var circleY = function(i){ | |
| return node.getPointAtLength(i).y | |
| } | |
| let direction = "TBC" | |
| let magnitude = 20 | |
| createCircles(10) | |
| function createCircles(radius){ | |
| g.selectAll('circle').remove() | |
| let circleID = 0 | |
| let prevCircleX = circleX(0) | |
| let prevCircleY = circleY(0) | |
| appendCircle(prevCircleX, prevCircleY, radius, circleID) | |
| for (var l = 1; l < pathLength; l++) { | |
| let thisCircleX = circleX(l) | |
| let thisCircleY = circleY(l) | |
| let sideX = Math.abs(thisCircleX - prevCircleX) | |
| let sideY = Math.abs(thisCircleY - prevCircleY) | |
| let hyp = Math.sqrt((sideX * sideX) + (sideY * sideY)) | |
| if (hyp > (radius * 2)) { | |
| circleID = circleID + 1 | |
| prevCircleX = thisCircleX | |
| prevCircleY = thisCircleY | |
| appendCircle(prevCircleX, prevCircleY, radius, circleID) | |
| } | |
| } | |
| console.log(circleID) | |
| if (circleID != 75) { | |
| let newDirection = circleID < 75 ? "down" : "up" | |
| magnitude = direction == newDirection ? magnitude : magnitude/10 | |
| direction = newDirection | |
| radius = circleID < 75 ? radius - magnitude : radius + magnitude | |
| circleID = 0 | |
| createCircles(radius) | |
| } | |
| } | |
| function appendCircle(x, y, r, id) { | |
| g.append('circle') | |
| .attr('id', 'circle-' + id) | |
| .attr('r', r) | |
| .attr("cx", x ) | |
| .attr("cy", y ) | |
| .style('fill', 'grey') | |
| .style('opacity', 0.5) | |
| } | |
| </script> | |
| </body> |
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