Move mouse left/right to adjust resolution and up/down to adjust fadding. Click to reset.
Last active
June 6, 2021 05:59
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Circle Aliasing
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| var width = 500, | |
| height = 500, | |
| r = 450 | |
| var svg = d3.select('html') | |
| .append('svg') | |
| .attr({width: width, height: height}) | |
| .append('g') | |
| .translate([10, height - 10]) | |
| svg.append('rect') | |
| .attr({width: width, height: height, opacity: 0, y: -height}) | |
| svg.append('circle') | |
| .attr('r', r) | |
| .style({stroke: 'black', fill: 'none', 'stroke-width': 2}) | |
| var gridG = svg.append('g') | |
| var trailG = svg.append('g') | |
| var draws = 1, | |
| drawsToSave = 20, | |
| curY = -1 | |
| setS(20) | |
| setInterval(step, 50) | |
| function step(){ | |
| if (curY < 0) return | |
| var dif = Math.pow(curX*s, 2) + Math.pow(curY*s, 2) - r*r | |
| var incX = dif < 0 | |
| var curG = trailG.append('g').datum(draws) | |
| curG.append('rect') | |
| .style({stroke: '#F0F', fill: 'black', 'fill-opacity': .2, 'stroke-width': 2}) | |
| .translate([curX*s - s/2, -curY*s - s/2]) | |
| .attr({width: s, height: s}) | |
| .datum(draws) | |
| if (incX){ | |
| curG.append('path.trail') | |
| .attr('d', ['M', curX*s, -curY*s, 'h', s].join(' ')) | |
| .style('stroke', 'black') | |
| curX++ | |
| } else{ | |
| curG.append('path.trail') | |
| .attr('d', ['M', curX*s, -curY*s, 'v', s].join(' ')) | |
| .style('stroke', 'black') | |
| curY-- | |
| } | |
| } | |
| function setS(newS){ | |
| while (curY >= 0){ step() } | |
| s = newS | |
| curX = 0 | |
| curY = Math.floor(r/s) | |
| draws++ | |
| trailG.selectAll('g') | |
| .style('opacity', function(d){ return d/draws*.1 }) | |
| .filter(function(d){ return draws - d > drawsToSave }) | |
| .remove() | |
| var grid = d3.range(0, width + s, s).map(function(x){ | |
| return d3.range(0, -height -s, -s).map(function(y){ | |
| return P(x, y) | |
| }) | |
| }) | |
| gridG.selectAll('*').remove() | |
| gridG.dataAppend(_.flatten(grid), 'circle') | |
| .attr('r', 1) | |
| .translate(ƒ()) | |
| } | |
| d3.select('svg') | |
| .on('click', function(){ | |
| curX = 0 | |
| curY = Math.floor(r/s) | |
| trailG.selectAll('*').remove() | |
| }) | |
| .on('mousemove', function(){ | |
| var pos = d3.mouse(this) | |
| drawsToSave = pos[1]/height*30 | |
| setS(pos[0]/width*100 + 8) | |
| }) |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| svg{ | |
| overflow: visible; | |
| margin: 0px auto; | |
| display: block; | |
| } | |
| .trail{ | |
| stroke: red; | |
| opacity: .3; | |
| } | |
| rect{ | |
| stroke-opacity: .5; | |
| } | |
| html{ | |
| /*width: 960px;*/ | |
| height: 500px; | |
| } | |
| </style> | |
| <script src="/1wheel/raw/67b47524ed8ed829d021/d3-3.5.5.js"></script> | |
| <script src="/1wheel/raw/67b47524ed8ed829d021/lodash-3.8.0.js"></script> | |
| <script src='/1wheel/raw/1b6758978dc2d52d3a37/d3-jetpack.js'></script> | |
| <script src='/1wheel/raw/1b6758978dc2d52d3a37/d3-starterkit.js'></script> | |
| <script src='/1wheel/raw/5d32ecb8a54b42f53646/geometry.js'></script> | |
| <script src='circle-lattice.js'></script> |
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