Testing out Tadashi Tokieda's examples in his Moiré Patterns video applied to poisson-disc sampling
A duplicated pattern can be rotated to reveal Freaky Dot Patterns
code sources:
Created
January 5, 2016 12:48
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d3 | Freaky Dot Patterns
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| <!DOCTYPE html> | |
| <meta charset='utf-8'> | |
| <body> | |
| <style type='text/css'> | |
| body{ | |
| background-color: #FDBB30; | |
| color: #130C0E; | |
| width: 700px; | |
| margin: 0 auto; | |
| padding: 20px; | |
| font-family: Consolas, monaco, monospace; | |
| line-height: 1; | |
| } | |
| header { | |
| padding-left: 80px; | |
| } | |
| label { | |
| font-size: 13px; | |
| letter-spacing: 2px; | |
| } | |
| </style> | |
| <header> | |
| <label for='nAngle'> | |
| angle: <span id='nAngle-value'>…</span> | |
| </label> | |
| <input type='range' min='0' max='360' id='nAngle'> | |
| </header> | |
| <section id="vis"></section> | |
| <script src='//d3js.org/d3.v3.min.js'></script> | |
| <script> | |
| var width = 600, | |
| height = 560, | |
| viewPort = 400; | |
| var sample = poissonDiscSampler(viewPort, viewPort, 10); | |
| var svg = d3.select('#vis').append('svg') | |
| .attr('width', width) | |
| .attr('height', height); | |
| var g1 = svg.append('g') | |
| .attr({ | |
| id: 'holder1', | |
| transform: 'translate(80, 80) rotate(0)' | |
| }); | |
| var g2 = svg.append('g') | |
| .attr({ | |
| id: 'holder2', | |
| transform: 'translate(80, 80) rotate(0)' | |
| }); | |
| // when the input range changes update the angle | |
| d3.select('#nAngle').on('input', function() { | |
| update(+this.value); | |
| }); | |
| // initial starting angle of overlap | |
| update(0); | |
| // update the element | |
| function update(nAngle) { | |
| d3.select('#nAngle-value').text(nAngle); | |
| d3.select('#nAngle').property('value', nAngle); | |
| // rotate | |
| svg.select('#holder2') | |
| .attr('transform', 'translate(80, 80) rotate('+nAngle+', ' + viewPort/2 + ',' + viewPort/2 + ')'); | |
| } | |
| d3.timer(function() { | |
| for (var i = 0; i < 10; ++i) { | |
| var s = sample(); | |
| if (!s) return true; | |
| g1.append('circle') | |
| .attr('cx', s[0]) | |
| .attr('cy', s[1]) | |
| .attr('r', 2) | |
| .attr('fill', '#130C0E') | |
| .transition() | |
| .attr('r', 2); | |
| g2.append('circle') | |
| .attr('cx', s[0]) | |
| .attr('cy', s[1]) | |
| .attr('r', 2) | |
| .attr('fill', '#130C0E') | |
| .transition() | |
| .attr('r', 2); | |
| } | |
| }); | |
| // Based on https://www.jasondavies.com/poisson-disc/ | |
| function poissonDiscSampler(width, height, radius) { | |
| var k = 30, // maximum number of samples before rejection | |
| radius2 = radius * radius, | |
| R = 3 * radius2, | |
| cellSize = radius * Math.SQRT1_2, | |
| gridWidth = Math.ceil(width / cellSize), | |
| gridHeight = Math.ceil(height / cellSize), | |
| grid = new Array(gridWidth * gridHeight), | |
| queue = [], | |
| queueSize = 0, | |
| sampleSize = 0; | |
| return function() { | |
| if (!sampleSize) return sample(Math.random() * width, Math.random() * height); | |
| // Pick a random existing sample and remove it from the queue. | |
| while (queueSize) { | |
| var i = Math.random() * queueSize | 0, | |
| s = queue[i]; | |
| // Make a new candidate between [radius, 2 * radius] from the existing sample. | |
| for (var j = 0; j < k; ++j) { | |
| var a = 2 * Math.PI * Math.random(), | |
| r = Math.sqrt(Math.random() * R + radius2), | |
| x = s[0] + r * Math.cos(a), | |
| y = s[1] + r * Math.sin(a); | |
| // Reject candidates that are outside the allowed extent, | |
| // or closer than 2 * radius to any existing sample. | |
| if (0 <= x && x < width && 0 <= y && y < height && far(x, y)) return sample(x, y); | |
| } | |
| queue[i] = queue[--queueSize]; | |
| queue.length = queueSize; | |
| } | |
| }; | |
| function far(x, y) { | |
| var i = x / cellSize | 0, | |
| j = y / cellSize | 0, | |
| i0 = Math.max(i - 2, 0), | |
| j0 = Math.max(j - 2, 0), | |
| i1 = Math.min(i + 3, gridWidth), | |
| j1 = Math.min(j + 3, gridHeight); | |
| for (j = j0; j < j1; ++j) { | |
| var o = j * gridWidth; | |
| for (i = i0; i < i1; ++i) { | |
| if (s = grid[o + i]) { | |
| var s, | |
| dx = s[0] - x, | |
| dy = s[1] - y; | |
| if (dx * dx + dy * dy < radius2) return false; | |
| } | |
| } | |
| } | |
| return true; | |
| } | |
| function sample(x, y) { | |
| var s = [x, y]; | |
| queue.push(s); | |
| grid[gridWidth * (y / cellSize | 0) + (x / cellSize | 0)] = s; | |
| ++sampleSize; | |
| ++queueSize; | |
| return s; | |
| } | |
| } | |
| d3.select(self.frameElement).style('height', '700px'); | |
| </script> | |
| </body> | |
| </html> |
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