{"id":28171,"date":"2024-11-24T14:38:44","date_gmt":"2024-11-24T06:38:44","guid":{"rendered":"https:\/\/fwq.ai\/blog\/28171\/"},"modified":"2024-11-24T14:38:44","modified_gmt":"2024-11-24T06:38:44","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8canvas-api%e5%ae%9e%e7%8e%b0%e5%9b%be%e7%89%87%e6%9b%b2%e7%ba%bf%e6%8b%89%e4%bc%b8%e6%8e%92%e5%88%97%e5%b8%83%e5%b1%80%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/28171\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528Canvas API\u5b9e\u73b0\u56fe\u7247\u66f2\u7ebf\u62c9\u4f38\u6392\u5217\u5e03\u5c40\uff1f"},"content":{"rendered":"

\"\u5982\u4f55\u4f7f\u7528Canvas<\/p>\n

\u56fe\u7247\u66f2\u7ebf\u62c9\u4f38\u5e03\u5c40<\/strong><\/p>\n

\u60f3\u8981\u5b9e\u73b0\u56fe\u7247\u6309\u66f2\u7ebf\u62c9\u4f38\u5e76\u8fdb\u884c\u5e03\u5c40\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\uff0c\u672c\u6587\u5c06\u63d0\u4f9b\u4e24\u79cd\u65b9\u6848\u3002<\/p>\n

\u65b9\u6cd5\u4e00\uff1aCSS3<\/strong><\/p>\n

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\u65b9\u6cd5\u4e8c\uff1aCanvas API<\/strong><\/p>\n

Canvas API\u4e2d\u7684ImageData\u76f8\u5173\u65b9\u6cd5\u53ef\u4ee5\u63a7\u5236\u56fe\u7247\u50cf\u7d20\u70b9\u7684\u989c\u8272\u3002\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u624b\u52a8\u5b9e\u73b0\u66f2\u7ebf\u53d8\u5f62\u6548\u679c\u3002<\/p>\n

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

const canvas = document.getElementById('canvas');\nconst ctx = canvas.getContext('2d');\nconst img = new Image();\nimg.onload = function() {\n  \/\/ \u83b7\u53d6\u56fe\u50cf\u6570\u636e\n  const imgData = ctx.getImageData(0, 0, img.width, img.height);\n\n  \/\/ \u8bbe\u7f6e\u53d8\u5f62\u53c2\u6570\n  const curveStrength = 0.5; \/\/ \u66f2\u7ebf\u5f3a\u5ea6\n  const curveBias = 0.5; \/\/ \u66f2\u7ebf\u504f\u5411\n\n  \/\/ \u904d\u5386\u50cf\u7d20\u70b9\uff0c\u8fdb\u884c\u53d8\u5f62\n  for (let y = 0; y < imgData.height; y++) {\n    for (let x = 0; x < imgData.width; x++) {\n      const index = (y * imgData.width + x) * 4;\n      const dx = x - imgData.width \/ 2;\n      const dy = y - imgData.height \/ 2;\n      const dist = Math.sqrt(dx * dx + dy * dy);\n      const angle = Math.atan2(dy, dx);\n      const newX = x + curveStrength * Math.cos(angle) * dist * curveBias;\n      const newY = y + curveStrength * Math.sin(angle) * dist * curveBias;\n\n      \/\/ \u8bbe\u7f6e\u65b0\u50cf\u7d20\u70b9\u989c\u8272\n      imgData.data[index] = imgData.data[index + 0]; \/\/ \u7ea2\u8272\n      imgData.data[index + 1] = imgData.data[index + 1]; \/\/ \u7eff\u8272\n      imgData.data[index + 2] = imgData.data[index + 2]; \/\/ \u84dd\u8272\n      imgData.data[index + 3] = imgData.data[index + 3]; \/\/ \u900f\u660e\u5ea6\n    }\n  }\n\n  \/\/ \u5c06\u53d8\u5f62\u540e\u7684\u56fe\u50cf\u6570\u636e\u653e\u56de\u753b\u5e03\n  ctx.putImageData(imgData, 0, 0);\n};\nimg.src = 'image.png';<\/pre>\n
 \u767b\u5f55\u540e\u590d\u5236 <\/p>\n
\u6ce8\uff1a<\/strong>\u8be5\u4ee3\u7801\u4ec5\u63d0\u4f9b\u4e00\u4e2a\u793a\u4f8b\uff0c\u5b9e\u9645\u5e94\u7528\u4e2d\u9700\u8981\u6839\u636e\u5177\u4f53\u9700\u6c42\u4f18\u5316\u53c2\u6570\u548c\u5904\u7406\u4e2d\u95f4\u884c\u7b49\u95ee\u9898\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528Canvas API\u5b9e\u73b0\u56fe\u7247\u66f2\u7ebf\u62c9\u4f38\u5e03\u5c40\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":"
\u56fe\u7247\u66f2\u7ebf\u62c9\u4f38\u5e03\u5c40 \u60f3\u8981\u5b9e\u73b0\u56fe\u7247\u6309\u66f2\u7ebf\u62c9\u4f38\u5e76\u8fdb\u884c\u5e03\u5c40\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\uff0c\u672c\u6587\u5c06\u63d0\u4f9b\u4e24\u79cd\u65b9\u6848\u3002 \u65b9\u6cd5\u4e00\uff1aCSS3 \u5229\u7528CSS3\u7684transform\u5c5e\u6027\u4e2d\u7684rotateY\u53c2\u6570\uff0c\u53ef\u4ee5\u5b9e\u73b0\u56fe\u7247\u7684\u503e\u659c\u6548\u679c\u3002\u4f46\u5982\u9898\u4e3b\u6240\u8ff0\uff0c\u76f4\u63a5\u4f7f\u7528rotateY\u65e0\u6cd5\u8fbe\u5230\u7406\u60f3\u7684\u66f2\u7ebf\u6548\u679c\uff0c\u4e14\u4e2d\u95f4\u884c\u7684\u5904\u7406\u4e5f\u4e0d\u65b9\u4fbf\u3002 \u65b9\u6cd5\u4e8c\uff1aCanvas API Canvas API\u4e2d\u7684ImageData\u76f8\u5173\u65b9\u6cd5\u53ef\u4ee5\u63a7\u5236\u56fe\u7247\u50cf\u7d20\u70b9\u7684\u989c\u8272\u3002\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u624b\u52a8\u5b9e\u73b0\u66f2\u7ebf\u53d8\u5f62\u6548\u679c\u3002 \u4ee3\u7801\u793a\u4f8b const canvas = document.getElementById(‘canvas’); const ctx = canvas.getContext(‘2d’); const img = new Image(); img.onload = function() { \/\/ \u83b7\u53d6\u56fe\u50cf\u6570\u636e const imgData = ctx.getImageData(0, 0, img.width, img.height); \/\/ \u8bbe\u7f6e\u53d8\u5f62\u53c2\u6570 const curveStrength = 0.5; \/\/ \u66f2\u7ebf\u5f3a\u5ea6 const curveBias = 0.5; \/\/ \u66f2\u7ebf\u504f\u5411 \/\/ \u904d\u5386\u50cf\u7d20\u70b9\uff0c\u8fdb\u884c\u53d8\u5f62 for (let y = […]<\/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-28171","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/28171","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=28171"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/28171\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=28171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=28171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=28171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}