{"id":3999,"date":"2024-11-10T08:29:05","date_gmt":"2024-11-10T00:29:05","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3999\/"},"modified":"2024-11-10T08:29:05","modified_gmt":"2024-11-10T00:29:05","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-canvas-%e5%ae%9e%e7%8e%b0%e5%8a%a8%e6%80%81%e5%9b%be%e5%83%8f%e6%a8%a1%e7%b3%8a%e6%95%88%e6%9e%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3999\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u52a8\u6001\u56fe\u50cf\u6a21\u7cca\u6548\u679c\uff1f"},"content":{"rendered":"

\"\u5982\u4f55\u4f7f\u7528<\/p>\n

\u901a\u8fc7 canvas \u5b9e\u73b0\u52a8\u6001\u56fe\u50cf\u6a21\u7cca<\/strong><\/p>\n

\u4e3a\u4e86\u5728 canvas \u4e0a\u5b9e\u73b0\u56fe\u50cf\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u76f8\u4f3c\u66dd\u5149\u7167\u7247\u7684\u6a21\u7cca\u611f\uff0c\u53ef\u4ee5\u63a2\u7d22\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n

1. \u4e86\u89e3\u6a21\u7cca\u6982\u5ff5<\/strong><\/p>\n

\u6a21\u7cca\u6548\u679c\u5b9e\u8d28\u4e0a\u662f\u901a\u8fc7\u6563\u5c04\u5149\u7ebf\u6765\u51cf\u5c11\u56fe\u50cf\u7684\u6e05\u6670\u5ea6\u3002\u56e0\u6b64\uff0c\u9700\u8981\u4e86\u89e3\u5982\u4f55\u6a21\u62df\u8fd9\u79cd\u5149\u7ebf\u6563\u5c04\u3002<\/p>\n

2. \u521b\u5efa\u4e00\u4e2a canvas<\/strong><\/p>\n

\u521b\u5efa\u6240\u9700\u7684 canvas \u5143\u7d20\u5e76\u83b7\u53d6\u5176\u4e0a\u4e0b\u6587\u3002\u8fd9\u662f\u653e\u7f6e\u6a21\u7cca\u56fe\u50cf\u7684\u4f4d\u7f6e\u3002<\/p>\n

3. \u5728 canvas \u4e0a\u52a0\u8f7d\u56fe\u50cf<\/strong><\/p>\n

\u4f7f\u7528 drawimage() \u51fd\u6570\u5c06\u539f\u59cb\u56fe\u50cf\u52a0\u8f7d\u5230 canvas \u4e0a\u3002<\/p>\n

4. \u5e94\u7528\u6a21\u7cca\u6ee4\u955c<\/strong><\/p>\n

canvas \u63d0\u4f9b\u4e86 filter \u5c5e\u6027\uff0c\u7528\u4e8e\u5c06\u6ee4\u955c\u5e94\u7528\u4e8e\u56fe\u50cf\u3002\u5bf9\u4e8e\u6a21\u7cca\u6548\u679c\uff0c\u9700\u8981\u4f7f\u7528 blur() \u65b9\u6cd5\u3002<\/p>\n

5. \u8bbe\u7f6e\u6a21\u7cca\u534a\u5f84<\/strong><\/p>\n

\u6a21\u7cca\u534a\u5f84\u51b3\u5b9a\u4e86\u6a21\u7cca\u7684\u7a0b\u5ea6\u3002\u901a\u8fc7\u8bbe\u7f6e blur() \u65b9\u6cd5\u7684 amount \u53c2\u6570\uff0c\u53ef\u4ee5\u8c03\u6574\u6a21\u7cca\u6548\u679c\u3002<\/p>\n

6. \u5448\u73b0\u6a21\u7cca\u56fe\u50cf<\/strong><\/p>\n

\u5e94\u7528\u6a21\u7cca\u6ee4\u955c\u540e\uff0c\u901a\u8fc7\u518d\u6b21\u4f7f\u7528 drawimage() \u51fd\u6570\u5c06\u6a21\u7cca\u56fe\u50cf\u5448\u73b0\u5230 canvas \u4e0a\u3002<\/p>\n

7. \u5b9e\u73b0\u52a8\u6001\u6a21\u7cca<\/strong><\/p>\n

\u8981\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\uff0c\u9700\u8981\u5b9a\u671f\u66f4\u65b0\u6a21\u7cca\u534a\u5f84\u503c\uff08\u4f8b\u5982\uff0c\u968f\u7740\u9f20\u6807\u7684\u79fb\u52a8\uff09\u3002\u8fd9\u5c06\u5141\u8bb8\u6839\u636e\u7528\u6237\u7684\u8f93\u5165\u5b9e\u65f6\u66f4\u6539\u6a21\u7cca\u6548\u679c\u3002\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u52a8\u6001\u66f4\u65b0\u6a21\u7cca\u534a\u5f84\uff1a<\/p>\n

let blurAmount = 0; \/\/ \u521d\u59cb\u6a21\u7cca\u534a\u5f84\n\n\/\/ \u5b9e\u65f6\u66f4\u65b0\u6a21\u7cca\u534a\u5f84\ncanvas.addEventListener('mousemove', (event) => {\n  blurAmount = event.clientX \/ canvas.width * 10; \/\/ \u6839\u636e\u9f20\u6807\u76f8\u5bf9\u4f4d\u7f6e\u8ba1\u7b97\u6a21\u7cca\u534a\u5f84\n});\n\n\/\/ \u5448\u73b0\u52a8\u6001\u6a21\u7cca\u56fe\u50cf\nrequestAnimationFrame(() => {\n  context.clearRect(0, 0, canvas.width, canvas.height); \/\/ \u6e05\u9664 Canvas\n  context.filter = `blur(${blurAmount}px)`;          \/\/ \u5e94\u7528\u6a21\u7cca\u6ee4\u955c\n  context.drawImage(image, 0, 0);                   \/\/ \u5448\u73b0\u6a21\u7cca\u56fe\u50cf\n  requestAnimationFrame(render);                      \/\/ \u5faa\u73af\u6e32\u67d3\u52a8\u6001\u6a21\u7cca\u56fe\u50cf\n});<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u52a8\u6001\u56fe\u50cf\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":"
\u901a\u8fc7 canvas \u5b9e\u73b0\u52a8\u6001\u56fe\u50cf\u6a21\u7cca \u4e3a\u4e86\u5728 canvas \u4e0a\u5b9e\u73b0\u56fe\u50cf\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff0c\u76f8\u4f3c\u66dd\u5149\u7167\u7247\u7684\u6a21\u7cca\u611f\uff0c\u53ef\u4ee5\u63a2\u7d22\u4ee5\u4e0b\u6b65\u9aa4\uff1a 1. \u4e86\u89e3\u6a21\u7cca\u6982\u5ff5 \u6a21\u7cca\u6548\u679c\u5b9e\u8d28\u4e0a\u662f\u901a\u8fc7\u6563\u5c04\u5149\u7ebf\u6765\u51cf\u5c11\u56fe\u50cf\u7684\u6e05\u6670\u5ea6\u3002\u56e0\u6b64\uff0c\u9700\u8981\u4e86\u89e3\u5982\u4f55\u6a21\u62df\u8fd9\u79cd\u5149\u7ebf\u6563\u5c04\u3002 2. \u521b\u5efa\u4e00\u4e2a canvas \u521b\u5efa\u6240\u9700\u7684 canvas \u5143\u7d20\u5e76\u83b7\u53d6\u5176\u4e0a\u4e0b\u6587\u3002\u8fd9\u662f\u653e\u7f6e\u6a21\u7cca\u56fe\u50cf\u7684\u4f4d\u7f6e\u3002 3. \u5728 canvas \u4e0a\u52a0\u8f7d\u56fe\u50cf \u4f7f\u7528 drawimage() \u51fd\u6570\u5c06\u539f\u59cb\u56fe\u50cf\u52a0\u8f7d\u5230 canvas \u4e0a\u3002 4. \u5e94\u7528\u6a21\u7cca\u6ee4\u955c canvas \u63d0\u4f9b\u4e86 filter \u5c5e\u6027\uff0c\u7528\u4e8e\u5c06\u6ee4\u955c\u5e94\u7528\u4e8e\u56fe\u50cf\u3002\u5bf9\u4e8e\u6a21\u7cca\u6548\u679c\uff0c\u9700\u8981\u4f7f\u7528 blur() \u65b9\u6cd5\u3002 5. \u8bbe\u7f6e\u6a21\u7cca\u534a\u5f84 \u6a21\u7cca\u534a\u5f84\u51b3\u5b9a\u4e86\u6a21\u7cca\u7684\u7a0b\u5ea6\u3002\u901a\u8fc7\u8bbe\u7f6e blur() \u65b9\u6cd5\u7684 amount \u53c2\u6570\uff0c\u53ef\u4ee5\u8c03\u6574\u6a21\u7cca\u6548\u679c\u3002 6. \u5448\u73b0\u6a21\u7cca\u56fe\u50cf \u5e94\u7528\u6a21\u7cca\u6ee4\u955c\u540e\uff0c\u901a\u8fc7\u518d\u6b21\u4f7f\u7528 drawimage() \u51fd\u6570\u5c06\u6a21\u7cca\u56fe\u50cf\u5448\u73b0\u5230 canvas \u4e0a\u3002 7. \u5b9e\u73b0\u52a8\u6001\u6a21\u7cca \u8981\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\uff0c\u9700\u8981\u5b9a\u671f\u66f4\u65b0\u6a21\u7cca\u534a\u5f84\u503c\uff08\u4f8b\u5982\uff0c\u968f\u7740\u9f20\u6807\u7684\u79fb\u52a8\uff09\u3002\u8fd9\u5c06\u5141\u8bb8\u6839\u636e\u7528\u6237\u7684\u8f93\u5165\u5b9e\u65f6\u66f4\u6539\u6a21\u7cca\u6548\u679c\u3002\u4ee5\u4e0b\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u52a8\u6001\u66f4\u65b0\u6a21\u7cca\u534a\u5f84\uff1a let blurAmount = 0; \/\/ \u521d\u59cb\u6a21\u7cca\u534a\u5f84 […]<\/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-3999","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3999","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=3999"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3999\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=3999"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=3999"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=3999"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}