8 lines
251 B
CoffeeScript
8 lines
251 B
CoffeeScript
# updates the canvas
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update_canvas = (width, height) ->
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canvas.width = width
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canvas.height = height
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# a range mapper which maps 's' to 'to' based on 'from'
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map_range = (from, to, s) ->
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to[0] + (s-from[0]) * (to[1] - to[0]) / (from[1] - from[0]) |