Created
November 12, 2011 05:25
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Tiny canvas game framework
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| window.atom = atom = {} | |
| atom.input = { | |
| _bindings: {} | |
| _down: {} | |
| _pressed: {} | |
| _released: [] | |
| bind: (key, action) -> | |
| @_bindings[key] = action | |
| onkeydown: (e) -> | |
| action = @_bindings[e.keyCode] | |
| return unless action | |
| @_pressed[action] = true unless @_down[action] | |
| @_down[action] = true | |
| e.stopPropagation() | |
| e.preventDefault() | |
| onkeyup: (e) -> | |
| action = @_bindings[e.keyCode] | |
| return unless action | |
| @_released.push action | |
| e.stopPropagation() | |
| e.preventDefault() | |
| clearPressed: -> | |
| for action in @_released | |
| @_down[action] = false | |
| @_released = [] | |
| @_pressed = {} | |
| pressed: (action) -> @_pressed[action] | |
| state: (action) -> @_down[action] | |
| } | |
| document.onkeydown = atom.input.onkeydown.bind(atom.input) | |
| document.onkeyup = atom.input.onkeyup.bind(atom.input) | |
| atom.key = { | |
| 'TAB': 9, | |
| 'ENTER': 13, | |
| 'ESC': 27, | |
| 'SPACE': 32, | |
| 'LEFT_ARROW': 37, | |
| 'UP_ARROW': 38, | |
| 'RIGHT_ARROW': 39, | |
| 'DOWN_ARROW': 40, | |
| }; | |
| atom.canvas = document.getElementsByTagName('canvas')[0] | |
| atom.context = atom.canvas.getContext '2d' | |
| window.onresize = (e) -> | |
| atom.canvas.width = window.innerWidth | |
| atom.canvas.height = window.innerHeight | |
| atom.width = atom.canvas.width | |
| atom.height = atom.canvas.height | |
| window.onresize() | |
| class Game | |
| constructor: -> | |
| @fps = 30 | |
| update: (dt) -> | |
| draw: -> | |
| run: -> | |
| @last_step = Date.now() | |
| @loop_interval = setInterval => | |
| @step() | |
| , 1000/@fps | |
| stop: -> | |
| clearInterval @loop_interval if @loop_interval? | |
| @loop_interval = null | |
| step: -> | |
| now = Date.now() | |
| dt = now - @last_step | |
| @last_step = now | |
| @update(dt) | |
| @draw() | |
| atom.input.clearPressed() | |
| atom.Game = Game |
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| class ExampleGame extends atom.Game | |
| constructor: -> | |
| super | |
| atom.input.bind atom.key.ENTER, 'hi' | |
| update: (dt) -> | |
| if atom.input.pressed 'hi' | |
| console.log "hi" | |
| draw: -> | |
| atom.context.fillStyle = 'black' | |
| atom.context.fillRect 0, 0, atom.width, atom.height | |
| game = new ExampleGame | |
| window.onblur = -> game.stop() | |
| window.onfocus = -> game.run() | |
| game.run() |
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| <html> | |
| <head> | |
| <style> | |
| canvas { position: absolute; top: 0; left: 0; } | |
| body { margin: 0; padding: 0; } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="main"></canvas> | |
| <script src="atom.js"></script> | |
| <script src="game.js"></script> | |
| </body> | |
| </html> |
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