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20 lines
664 B
Haskell
Executable file
20 lines
664 B
Haskell
Executable file
#!/usr/bin/env stack
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-- stack runghc --package reanimate
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{-# LANGUAGE OverloadedStrings #-}
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module Main (main) where
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import Reanimate
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main :: IO ()
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main = reanimate $
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bg `parA` (playThenReverseA $ drawText `andThen` fillText)
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where
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bg = animate $ const $ mkBackground "black"
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msg = "\\sum_{k=1}^\\infty {1 \\over k^2} = {\\pi^2 \\over 6}"
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glyphs = withStrokeWidth 0.01 $ center $ latexAlign msg
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fillText = mkAnimation 1 $ \t ->
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scale 2 $ withFillColor "white" $ withFillOpacity t glyphs
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drawText = mkAnimation 2 $ \t ->
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scale 2 $
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withStrokeColor "white" $ withFillOpacity 0 $
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partialSvg t glyphs
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