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React と 画像

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March 11, 2016
Programming
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React と 画像

途中で出てくるデモはこちらです http://ymrl.github.io/lgtm-editor/

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ymrl

March 11, 2016
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Transcript

  1. Reactͱը૾ Gotanda.js #3 @ymrl

  2. ςΩετ ࣗݾ঺հ ▸ @ymrl (Twitter, GitHub, etc…) ▸ freeeͱ͍͏ձࣾͰڅ༩ܭࢉαʔϏεΛ࡞͍ͬͯ·͢

  3. ςΩετ LGTMize ▸ 1೥΄Ͳલʹࡶʹ࡞ͬͨChrome֦ு ▸ ը૾΍ϏσΦΛӈΫϦοΫͯ͠LGTMͬͯจࣈΛࡌͤͯอଘ ▸ ࣾ಺ͷԁ׈ͳίϛϡχέʔγϣϯʹʢݸਓతʹ͸ʣศར

  4. http://bylines.news.yahoo.co.jp/kohyoungki/20151012-00050386/

  5. ςΩετ Canvasཁૉ ▸ ͍ΘΏΔHTML5ͷՖܗͬΆ͍΍ͭ ▸ 2࣍ݩϏοτϚοϓը૾͕ѻ͑Δ ▸ ศརͳΑ͏Ͱ͚ͬ͜͏໘౗͍͘͞ ▸ ྑ͘΋ѱ͘΋ϏοτϚοϓ

  6. react-canvas

  7. ςΩετ react-canvas ▸ ReactͰը૾͕࡞ΕΔͧʂʂʂ ▸ Textͱ͔Imageͱ͔Layerͱ͔࢖ͬͯը૾࡞ΕΔ ▸ CSSͬΆ͍ObjectΛ౉ͯ͠ελΠϧΛௐ੔ ▸ ຊདྷ͸ߴ଎ͳಈ࡞ͷUIΛ࡞ΔͨΊʹ࡞ΒΕͨͬΆ͍งғؾ

    ▸ mouse/touchܥΠϕϯτ΋͍͔࣮ͭ͘૷͞ΕͯΔ
  8. None
  9. None

  10. DEMO

  11. إೝࣝ

  12. إʹจࣈ͕͔͔ Δͷ͸ආ͚͍ͨ

  13. ςΩετ ccv ▸ CݴޠͷϥΠϒϥϦ͚ͩͲJSʹҠ২͞ΕͯΔ ▸ إೝࣝͰ͖Δ ▸ Web Worker࢖͑Δʢ࢖ͬͯͳ͍ʣ ▸

    npmͱ͔ීٴͯ͠ͳ͍ࠒͷϒπͳͷͰద౰ʹམͱ͖ͯͨ͠ ϑΝΠϧΛ഑ஔͯ͠࢖͏

  14. http://www.asahi.com/articles/ASHB75GGFHB7UTFK00G.html

  15. http://www.asahi.com/articles/ASHB75GGFHB7UTFK00G.html

  16. None
  17. None

  18. ςΩετ إΛආ͚Δ ▸ ݩͷը૾͔ΒإͷҐஔͰۣܗΛ੾͍ͬͯͬͨ࢒Γͷ͏ͪ
 Ұ൪޿͍৔ॴʹ഑ஔ ▸ ReactCanvasͷϊʔυΛ౉͢ͱനࠇԽ͞Εͯ͠·ͬͨΓ͢Δ ▸ ͍ͬͯ͏͔͜Ε͋Μ·ΓReactؔ܎ͳ͍ ▸

    ؾܰʹCanvasΛॻ͖௚ͤΔͷ͸ྑ͍

  19. GIF

  20. animated GIF

  21. ςΩετ gif ▸ Canvasཁૉʹॻ͖ग़͢ͱ1ίϚ໨ ▸ toDataURL() Ͱ͖ͳ͍ ▸ ʢαϒϚϦϯಛڐͬͯͲ͏ͳͬͨΜͰ͚ͨͬ͠ʣ

  22. ςΩετ readwrite-gif ▸ EncoderͱDecoder͕ೖͬͯΔ ▸ 1ίϚͣͭImageDataͰಡΈग़ͤͨΓ͢Δ ▸ Encoder͸ gif.jsify ͷ΄͏͕ଟػೳ͔΋……

    ▸ ίϚ͝ͱʹ௕͞Λม͑ͨΓͰ͖ͦ͏

  23. GIF ΛಡΉ

  24. None
  25. None

  26. ࠶ੜ

  27. None

  28. શϑϨʔϜඳը
 ͠ͳ͖Όμϝ

  29. None

  30. ग़ྗ

  31. ςΩετ શϑϨʔϜͷը૾σʔλ͕΄͍͠ ▸ setState()ͰϑϨʔϜΛ1ͭͣͭඳը͍ͯ͘͠ͷ͸೉͍͠ ▸ ࠶ඳըͷλΠϛϯά͕Α͘Θ͔Βͳ͍ ▸ ࠶ੜ͠ͳ͕Βඳը݁ՌΛอଘ͚ͯ͠͹Α͍ͷͰ͸ʁ ▸ componentDidUpdate

    Ͱద౰ʹಥͬࠐΜͰ͍͘
  32. None
  33. None

  34. ͳΜͱ͔ग़ͤΔΑ ͏ʹ͸ͳͬͨͧ

  35. ςΩετ ·ͱΊ ▸ animated GIFͷ૬खΛ͢Δͷ͸ͭΒ͍

  36. ͝ਗ਼ௌ͋Γ͕ͱ ͏͍͟͝·ͨ͠