Last active
March 4, 2016 03:10
-
-
Save danasilver/edf6332dd875699aceb5 to your computer and use it in GitHub Desktop.
Gaussian Blur
This file contains 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.
Learn more about bidirectional Unicode characters
| height: 504 | |
| license: MIT |
This file contains 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.
Learn more about bidirectional Unicode characters
This file contains 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.
Learn more about bidirectional Unicode characters
| <!doctype html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var margin = {top: 0, right: 0, bottom: 0, left: 0}, | |
| width = 960 - margin.left - margin.right, | |
| height = 504 - margin.top - margin.bottom; | |
| var pixels = d3.range(42) | |
| .map(function() { | |
| return d3.range(80).map(function() { return Math.random() * 255 | 0; }); | |
| }); | |
| var gaussian = [ | |
| [1/16, 2/16, 1/16], | |
| [2/16, 4/16, 2/16], | |
| [1/16, 2/16, 1/16] | |
| ]; | |
| var convolved = convolve(pixels, gaussian); | |
| var svg = d3.select('body').append('svg') | |
| .attr('width', width + margin.left + margin.right) | |
| .attr('height', height + margin.top + margin.bottom) | |
| .append('g') | |
| .attr('transform', ' translate(' + margin.left + ',' + margin.top + ')'); | |
| var row = svg.selectAll('g') | |
| .data(pixels).enter() | |
| .append('g') | |
| .attr('class', 'row') | |
| .attr('transform', function(d, i) { return 'translate(0,' + (i * height / 42) + ')'; }); | |
| row.selectAll('rect') | |
| .data(function(d) { return d; }).enter() | |
| .append('rect') | |
| .attr('height', 11) | |
| .attr('width', 11) | |
| .attr('x', function(d, i) { return i * 12; }) | |
| .attr('fill', function(d) { return 'rgb(' + d + ',' + d + ',' + d + ')' }); | |
| transition(); | |
| setInterval(transition, 5600); | |
| function transition() { | |
| row | |
| .data(convolve(pixels, gaussian)) | |
| .selectAll('rect') | |
| .data(function(d) { return d; }) | |
| .transition() | |
| .delay(function(d, i) { return i * 10; }) | |
| .duration(2000) | |
| .attr('fill', function(d) { return 'rgb(' + d + ',' + d + ',' + d + ')' }); | |
| row | |
| .data(pixels) | |
| .selectAll('rect') | |
| .data(function(d) { return d; }) | |
| .transition() | |
| .delay(function(d, i) { return 3000 + (80 - i) * 10; }) | |
| .duration(2000) | |
| .attr('fill', function(d) { return 'rgb(' + d + ',' + d + ',' + d + ')' }); | |
| } | |
| function convolve(pixels, kernel) { | |
| var height = pixels.length, | |
| width = pixels[0].length, | |
| kernelHeight = kernel.length, | |
| kernelWidth = kernel[0].length; | |
| var output = d3.range(height) | |
| .map(function() { return d3.range(width).map(function() { return 0; }); }); | |
| for (var y = 0; y < height; y++) { | |
| for (var x = 0; x < width; x++) { | |
| var accumulator = 0; | |
| for (var kernelY = 0; kernelY < kernelHeight; kernelY++) { | |
| for (var kernelX = 0; kernelX < kernelWidth; kernelX++) { | |
| // kernel origin is in the center of the 2d array | |
| var currentY = y + kernelY - Math.floor(kernelHeight / 2); | |
| var currentX = x + kernelX - Math.floor(kernelWidth / 2); | |
| if (currentY >= 0 && currentY < height && | |
| currentX >= 0 && currentX < width) { | |
| var src = pixels[currentY][currentX]; | |
| var weight = kernel[kernelY][kernelX]; | |
| accumulator += src * weight; | |
| } | |
| } | |
| } | |
| output[y][x] = accumulator; | |
| } | |
| } | |
| return output; | |
| } | |
| </script> | |
| </body> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment