31:[] 2f:{"title":"Sacks number spiral","cells":[{"id":0,"value":"md`# Sacks number spiral`","pinned":false,"hidden":false,"mode":"ojs"},{"id":15,"value":"viewof svg = {\n console.log(\"svg\")\n const svg = d3.select(DOM.svg(width, height));\n \n svg.attr('viewBox', `-${width/2} -${height/2} ${width} ${height}`);\n \n const g = svg.append('g');\n \n svg.node().value = g;\n return svg.node();\n}\n/*{\n const show_labels = (scale > 10);\n \n return svg``;\n}*/","pinned":false,"hidden":false,"mode":"ojs"},{"id":217,"value":"{\n console.log(\"update\")\n const sel = svg.selectAll('circle').data(numbers, num => num.i)\n \n sel.enter().append('circle')\n .attr('r', num => prime(num.i) ? 4*scale : 1*scale)\n .attr('cx', num => 10 * num.x)\n .attr('cy', num => 10 * num.y)\n \n sel.exit().remove()\n /*\n return svg``;*/\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":12,"value":"viewof n = slider({ min: 1, max: 10000, value: 2000 })","pinned":false,"hidden":false,"mode":"ojs"},{"id":134,"value":"viewof scale = slider({ min: 1, max: 3, value: 1 })","pinned":false,"hidden":false,"mode":"ojs"},{"id":226,"value":"{\n svg.attr('transform', `scale(${1/scale})`)\n \n //svg.selectAll('circle').data(numbers, num => num.i)\n // .attr('r', num => prime(num.i) ? 4*scale : 1*scale)\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":198,"value":"numbers = {\n const numbers = [];\n for (var i = 0; i < n; i++) {\n const r = Math.sqrt(i);\n const x = r * Math.cos(r * 2*Math.PI);\n const y = r * Math.sin(r * 2*Math.PI);\n numbers.push({ i, x, y });\n }\n return numbers;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":189,"value":"height = 400","pinned":false,"hidden":false,"mode":"ojs"},{"id":166,"value":"prime = num => {\n for (var i = 2, s = Math.sqrt(num); i <= s; i++)\n if (num % i === 0) return false; \n return num !== 1;\n}","pinned":false,"hidden":false,"mode":"ojs"},{"id":66,"value":"loop = (n, f) => new Array(n).fill().map((x,i) => f(i)).join('')","pinned":false,"hidden":false,"mode":"ojs"},{"id":209,"value":"d3 = require('d3@5')","pinned":false,"hidden":false,"mode":"ojs"},{"id":10,"value":"import { slider } from '@jashkenas/inputs'","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W31","stdlib":"1","titling":"auto"}