Created
September 28, 2012 09:27
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Javascript to read an image and then cut it into tiles
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| node_modules/ | |
| *.sw* |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>File API Demo</title> | |
| <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script> | |
| <script src="/script.js"></script> | |
| </head> | |
| <body> | |
| <input id="file" name="file" type="file"/> | |
| </body> | |
| </html> |
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| { | |
| "name": "file-api", | |
| "description": "file api test app", | |
| "version": "0.0.1", | |
| "private": true, | |
| "dependencies": { | |
| "express": "3.x", | |
| "coffee-script": "1.3.x" | |
| } | |
| } |
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| $ -> | |
| if not window.File or not window.FileReader or not window.FileList or not window.Blob | |
| alert 'The File APIs are not fully supported in this browser.' | |
| else | |
| ($ '#file').change (e) -> | |
| file = e.target.files[0] | |
| if file.type.match 'image.*' | |
| reader = new FileReader | |
| reader.onload = do (file) -> | |
| (e) -> | |
| ($ 'body div').remove() | |
| src = e.target.result | |
| ($ '<img>', src: src).appendTo($ 'body').load -> | |
| width = ($ @).width() | |
| height = ($ @).height() | |
| ($ @).remove() | |
| $d = ($ '<div>').appendTo $ 'body' | |
| cols = Math.floor width / 32 | |
| rows = Math.floor height / 32 | |
| elems = {} | |
| tilenum = 0 | |
| for y in [0..rows] | |
| for x in [0..cols] | |
| elems[".tile#{tilenum}"] = | |
| x: -x * 32 | |
| y: -y * 32 | |
| tilenum++ | |
| console.log elems | |
| style = ".tileset{\n\tbackground-image: url('#{src}'); background-repeat: no-repeat;}.tile{width:32px;height:32px;display:inline-block}\n" | |
| for tile of elems | |
| t = elems[tile] | |
| style += "#{tile} {\n\tbackground-position: #{t.x}px #{t.y}px;\n}\n" | |
| $d.append("<style>#{style}</style>") | |
| $t = ($ '<div>', style: "width:#{(cols+1)*32}px;") | |
| for n in [0..tilenum-1] | |
| $t.append $ '<div>', class: "tileset tile tile#{n}" | |
| $t.appendTo $d | |
| reader.readAsDataURL file |
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| express = require 'express' | |
| coffee = require 'coffee-script' | |
| fs = require 'fs' | |
| app = express() | |
| app.configure -> | |
| app.use express.bodyParser() | |
| app.use express.methodOverride() | |
| app.use express.favicon() | |
| app.use express.static "#{__dirname}/public" | |
| app.use app.router | |
| app.get '/', (req, res) -> | |
| res.sendfile "#{__dirname}/index.html" | |
| app.get '/script.js', (req, res) -> | |
| fs.readFile "#{__dirname}/public/script.coffee", (err, cnt) -> | |
| res.set 'Content-Type', 'text/javascript' | |
| res.send coffee.compile cnt + '' | |
| app.listen 8080 | |
| console.log 'Started' |
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