React と 画像

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 ͏͍͟͝·ͨ͠