{"id":4032,"date":"2024-11-10T09:56:13","date_gmt":"2024-11-10T01:56:13","guid":{"rendered":"https:\/\/fwq.ai\/blog\/4032\/"},"modified":"2024-11-10T09:56:13","modified_gmt":"2024-11-10T01:56:13","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8canvas%e5%8a%a8%e6%80%81%e5%ae%9e%e7%8e%b0%e5%9b%be%e7%89%87%e6%a8%a1%e7%b3%8a%e6%95%88%e6%9e%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/4032\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528Canvas\u52a8\u6001\u5b9e\u73b0\u56fe\u7247\u6a21\u7cca\u6548\u679c\uff1f"},"content":{"rendered":"

\"\u5982\u4f55\u4f7f\u7528Canvas\u52a8\u6001\u5b9e\u73b0\u56fe\u7247\u6a21\u7cca\u6548\u679c\uff1f\u63d2\u56fe\"<\/p>\n

canvas\u52a8\u6001\u5b9e\u73b0\u56fe\u7247\u6a21\u7cca\u6548\u679c<\/strong><\/p>\n

\u95ee\u9898\uff1a<\/strong>
\u5982\u4f55\u5728canvas\u4e2d\u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u7c7b\u4f3c\u4e8e\u66dd\u5149\u7167\u7247\u540e\u7684\u6548\u679c\uff1f<\/p>\n

\u56de\u7b54\uff1a<\/strong>
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    \n
  1. \u521b\u5efacanvas\u548c\u52a0\u8f7d\u56fe\u50cf\uff1a<\/strong>
    \u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2acanvas\u5143\u7d20\u5e76\u52a0\u8f7d\u8981\u6a21\u7cca\u7684\u56fe\u50cf\u3002<\/li>\n
  2. \u83b7\u53d6\u56fe\u50cf\u6570\u636e\uff1a<\/strong>
    \u4f7f\u7528getimagedata()\u65b9\u6cd5\u83b7\u53d6\u56fe\u50cf\u50cf\u7d20\u6570\u636e\u3002<\/li>\n
  3. \u5e94\u7528\u5377\u79ef\u6838\uff1a<\/strong>
    \u5377\u79ef\u6838\u662f\u4e00\u4e2a\u77e9\u9635\uff0c\u7528\u6765\u8ba1\u7b97\u6bcf\u4e2a\u50cf\u7d20\u7684\u6a21\u7cca\u7a0b\u5ea6\u3002\u8fd9\u6d89\u53ca\u5377\u79ef\u56fe\u50cf\u6570\u636e\u4e0e\u5377\u79ef\u6838\u3002<\/li>\n<\/ol>\n

    \u4f60\u53ef\u4ee5\u4f7f\u7528\u9ad8\u65af\u5377\u79ef\u6838\u6765\u521b\u5efa\u5e73\u6ed1\u6a21\u7cca\uff0c\u5176\u4e2d\u5fc3\u8d8a\u4eae\u50cf\u7d20\u6a21\u7cca\u7a0b\u5ea6\u8d8a\u9ad8\u3002<\/p>\n

      \n
    1. \u8bbe\u7f6e\u6a21\u7cca\u56fe\u50cf\uff1a<\/strong>
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    2. \u52a8\u6001\u6a21\u7cca\uff1a<\/strong>
      \u8981\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\uff0c\u4f60\u53ef\u4ee5\u5728\u4e00\u4e2a\u65f6\u95f4\u5faa\u73af\u4e2d\u91cd\u590d\u8fd9\u4e9b\u6b65\u9aa4\uff0c\u6bcf\u6b21\u8fed\u4ee3\u4e2d\u5e94\u7528\u8f83\u5c0f\u7684\u6a21\u7cca\u91cf\uff0c\u76f4\u81f3\u8fbe\u5230\u6240\u9700\u7684\u6a21\u7cca\u7a0b\u5ea6\u3002<\/li>\n<\/ol>\n

      \u793a\u4f8b\u4ee3\u7801\uff1a<\/strong><\/p>\n

      const canvas = document.getElementById('canvas');\nconst ctx = canvas.getContext('2d');\nconst image = new Image();\nimage.onload = function() {\n  const imageData = ctx.getImageData(0, 0, image.width, image.height);\n  \/\/ ... \u5e94\u7528\u5377\u79ef\u6838 ...\n  ctx.putImageData(imageData, 0, 0);\n};\nimage.src = 'your_image.jpg';\n\n\/\/ \u5efa\u7acb\u52a8\u753b\u5faa\u73af\u4ee5\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\nrequestAnimationFrame(animate);\n\nfunction animate() {\n  \/\/ ... \u5e94\u7528\u5377\u79ef\u6838\u5e76\u653e\u56de\u6a21\u7cca\u540e\u7684\u50cf\u7d20\u6570\u636e ...\n  requestAnimationFrame(animate);\n}<\/pre>\n
        \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
      \u5176\u4ed6\u4fe1\u606f\uff1a<\/strong><\/p>\n
      \u8fd9\u79cd\u6a21\u7cca\u6548\u679c\u79f0\u4e3a\u201c\u9ad8\u65af\u6a21\u7cca\u201d\uff0c\u5b83\u901a\u5e38\u7528\u4e8e\u56fe\u50cf\u7f16\u8f91\u548c\u56fe\u5f62\u5904\u7406\u4e2d\u3002<\/p>\n
      \u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528Canvas\u52a8\u6001\u5b9e\u73b0\u56fe\u7247\u6a21\u7cca\u6548\u679c\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
      canvas\u52a8\u6001\u5b9e\u73b0\u56fe\u7247\u6a21\u7cca\u6548\u679c \u95ee\u9898\uff1a\u5982\u4f55\u5728canvas\u4e2d\u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u7c7b\u4f3c\u4e8e\u66dd\u5149\u7167\u7247\u540e\u7684\u6548\u679c\uff1f \u56de\u7b54\uff1a\u5728canvas\u4e2d\u53ef\u4ee5\u5229\u7528\u5377\u79ef\u6838\u6765\u5b9e\u73b0\u6a21\u7cca\u6548\u679c\u3002\u4ee5\u4e0b\u662f\u5b9e\u73b0\u6b65\u9aa4\uff1a \u521b\u5efacanvas\u548c\u52a0\u8f7d\u56fe\u50cf\uff1a\u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2acanvas\u5143\u7d20\u5e76\u52a0\u8f7d\u8981\u6a21\u7cca\u7684\u56fe\u50cf\u3002 \u83b7\u53d6\u56fe\u50cf\u6570\u636e\uff1a\u4f7f\u7528getimagedata()\u65b9\u6cd5\u83b7\u53d6\u56fe\u50cf\u50cf\u7d20\u6570\u636e\u3002 \u5e94\u7528\u5377\u79ef\u6838\uff1a\u5377\u79ef\u6838\u662f\u4e00\u4e2a\u77e9\u9635\uff0c\u7528\u6765\u8ba1\u7b97\u6bcf\u4e2a\u50cf\u7d20\u7684\u6a21\u7cca\u7a0b\u5ea6\u3002\u8fd9\u6d89\u53ca\u5377\u79ef\u56fe\u50cf\u6570\u636e\u4e0e\u5377\u79ef\u6838\u3002 \u4f60\u53ef\u4ee5\u4f7f\u7528\u9ad8\u65af\u5377\u79ef\u6838\u6765\u521b\u5efa\u5e73\u6ed1\u6a21\u7cca\uff0c\u5176\u4e2d\u5fc3\u8d8a\u4eae\u50cf\u7d20\u6a21\u7cca\u7a0b\u5ea6\u8d8a\u9ad8\u3002 \u8bbe\u7f6e\u6a21\u7cca\u56fe\u50cf\uff1a\u5c06\u6a21\u7cca\u540e\u7684\u50cf\u7d20\u6570\u636e\u653e\u56decanvas\u4e2d\uff0c\u4f7f\u7528putimagedata()\u65b9\u6cd5\u3002 \u52a8\u6001\u6a21\u7cca\uff1a\u8981\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\uff0c\u4f60\u53ef\u4ee5\u5728\u4e00\u4e2a\u65f6\u95f4\u5faa\u73af\u4e2d\u91cd\u590d\u8fd9\u4e9b\u6b65\u9aa4\uff0c\u6bcf\u6b21\u8fed\u4ee3\u4e2d\u5e94\u7528\u8f83\u5c0f\u7684\u6a21\u7cca\u91cf\uff0c\u76f4\u81f3\u8fbe\u5230\u6240\u9700\u7684\u6a21\u7cca\u7a0b\u5ea6\u3002 \u793a\u4f8b\u4ee3\u7801\uff1a const canvas = document.getElementById(‘canvas’); const ctx = canvas.getContext(‘2d’); const image = new Image(); image.onload = function() { const imageData = ctx.getImageData(0, 0, image.width, image.height); \/\/ … \u5e94\u7528\u5377\u79ef\u6838 … ctx.putImageData(imageData, 0, 0); }; image.src = ‘your_image.jpg’; \/\/ \u5efa\u7acb\u52a8\u753b\u5faa\u73af\u4ee5\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca requestAnimationFrame(animate); function animate() { \/\/ … \u5e94\u7528\u5377\u79ef\u6838\u5e76\u653e\u56de\u6a21\u7cca\u540e\u7684\u50cf\u7d20\u6570\u636e … […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-4032","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/4032","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=4032"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/4032\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=4032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=4032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=4032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}