{"id":3886,"date":"2024-11-10T14:23:24","date_gmt":"2024-11-10T06:23:24","guid":{"rendered":"https:\/\/fwq.ai\/blog\/3886\/"},"modified":"2024-11-10T14:23:24","modified_gmt":"2024-11-10T06:23:24","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-canvas-%e5%ae%9e%e7%8e%b0%e5%9b%be%e7%89%87%e7%9a%84%e5%8a%a8%e6%80%81%e6%a8%a1%e7%b3%8a%e6%95%88%e6%9e%9c%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/3886\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\uff1f"},"content":{"rendered":"

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

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

\u60f3\u8981\u5728 canvas \u4e0a\u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\uff0c\u6a21\u62df\u66dd\u5149\u540e\u7684\u6548\u679c\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n

1. \u83b7\u53d6\u539f\u59cb\u56fe\u7247<\/strong><\/p>\n

\u9996\u5148\uff0c\u52a0\u8f7d\u539f\u59cb\u56fe\u7247\u5230 canvas \u4e2d\u3002<\/p>\n

2. \u521b\u5efa\u6a21\u7cca\u6ee4\u955c<\/strong><\/p>\n

\u4f7f\u7528 canvasrenderingcontext2d \u5bf9\u8c61\u4e2d\u7684 filter \u5c5e\u6027\u521b\u5efa\u4e00\u4e2a\u6a21\u7cca\u6ee4\u955c\u3002\u6a21\u7cca\u7a0b\u5ea6\u53ef\u4ee5\u4f7f\u7528 blur() \u65b9\u6cd5\u6765\u8bbe\u7f6e\u3002\u4f8b\u5982\uff1a<\/p>\n

ctx.filter = \"blur(5px)\";<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
3. \u7ed8\u5236\u56fe\u7247<\/strong><\/p>\n
\u4f7f\u7528 drawimage() \u65b9\u6cd5\u5c06\u56fe\u7247\u7ed8\u5236\u5230 canvas \u4e0a\u3002\u6ee4\u955c\u5c06\u5e94\u7528\u4e8e\u56fe\u50cf\uff0c\u4f7f\u5176\u53d8\u5f97\u6a21\u7cca\u3002<\/p>\n
4. \u52a8\u6001\u8c03\u6574\u6a21\u7cca\u7a0b\u5ea6<\/strong><\/p>\n
\u8981\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\uff0c\u53ef\u4ee5\u52a8\u6001\u66f4\u65b0\u6ee4\u955c\u7684\u6a21\u7cca\u7a0b\u5ea6\u3002\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539 blur() \u65b9\u6cd5\u7684\u53c2\u6570\u6765\u5b9e\u73b0\u3002<\/p>\n
\u5b8c\u6574\u7684\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\/\/ \u83b7\u53d6\u539f\u59cb\u56fe\u7247\nconst image = new Image();\nimage.src = \"image.png\";\n\n\/\/ \u5728 Canvas \u4e0a\u52a0\u8f7d\u56fe\u7247\nconst canvas = document.getElementById(\"canvas\");\nconst ctx = canvas.getContext(\"2d\");\n\n\/\/ \u521b\u5efa\u6a21\u7cca\u6ee4\u955c\nctx.filter = \"blur(0px)\";\n\n\/\/ \u7ed8\u5236\u56fe\u7247\nimage.onload = () => {\n  ctx.drawImage(image, 0, 0);\n};\n\n\/\/ \u52a8\u6001\u8c03\u6574\u6a21\u7cca\u7a0b\u5ea6\nconst increment = 1;\nconst maxBlur = 20;\nlet currentBlur = 0;\n\nwindow.setInterval(() => {\n  if (currentBlur >= maxBlur) {\n    increment = -1;\n  } else if (currentBlur <= 0) {\n    increment = 1;\n  }\n\n  currentBlur += increment;\n  ctx.filter = `blur(${currentBlur}px)`;\n  ctx.drawImage(image, 0, 0);\n}, 50);<\/pre>\n
  \u767b\u5f55\u540e\u590d\u5236   <\/p>\n
\u901a\u8fc7\u8c03\u6574 maxblur \u548c increment \u7684\u503c\uff0c\u53ef\u4ee5\u5b9e\u73b0\u4e0d\u540c\u7684\u52a8\u6001\u6a21\u7cca\u6548\u679c\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5982\u4f55\u4f7f\u7528 Canvas \u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\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\u6a21\u7cca\u5b9e\u73b0 \u60f3\u8981\u5728 canvas \u4e0a\u5b9e\u73b0\u56fe\u7247\u7684\u52a8\u6001\u6a21\u7cca\uff0c\u6a21\u62df\u66dd\u5149\u540e\u7684\u6548\u679c\uff0c\u53ef\u4ee5\u91c7\u7528\u4ee5\u4e0b\u6b65\u9aa4\uff1a 1. \u83b7\u53d6\u539f\u59cb\u56fe\u7247 \u9996\u5148\uff0c\u52a0\u8f7d\u539f\u59cb\u56fe\u7247\u5230 canvas \u4e2d\u3002 2. \u521b\u5efa\u6a21\u7cca\u6ee4\u955c \u4f7f\u7528 canvasrenderingcontext2d \u5bf9\u8c61\u4e2d\u7684 filter \u5c5e\u6027\u521b\u5efa\u4e00\u4e2a\u6a21\u7cca\u6ee4\u955c\u3002\u6a21\u7cca\u7a0b\u5ea6\u53ef\u4ee5\u4f7f\u7528 blur() \u65b9\u6cd5\u6765\u8bbe\u7f6e\u3002\u4f8b\u5982\uff1a ctx.filter = “blur(5px)”; \u767b\u5f55\u540e\u590d\u5236 3. \u7ed8\u5236\u56fe\u7247 \u4f7f\u7528 drawimage() \u65b9\u6cd5\u5c06\u56fe\u7247\u7ed8\u5236\u5230 canvas \u4e0a\u3002\u6ee4\u955c\u5c06\u5e94\u7528\u4e8e\u56fe\u50cf\uff0c\u4f7f\u5176\u53d8\u5f97\u6a21\u7cca\u3002 4. \u52a8\u6001\u8c03\u6574\u6a21\u7cca\u7a0b\u5ea6 \u8981\u5b9e\u73b0\u52a8\u6001\u6a21\u7cca\uff0c\u53ef\u4ee5\u52a8\u6001\u66f4\u65b0\u6ee4\u955c\u7684\u6a21\u7cca\u7a0b\u5ea6\u3002\u53ef\u4ee5\u901a\u8fc7\u4fee\u6539 blur() \u65b9\u6cd5\u7684\u53c2\u6570\u6765\u5b9e\u73b0\u3002 \u5b8c\u6574\u7684\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a \/\/ \u83b7\u53d6\u539f\u59cb\u56fe\u7247 const image = new Image(); image.src = “image.png”; \/\/ \u5728 Canvas \u4e0a\u52a0\u8f7d\u56fe\u7247 const canvas = document.getElementById(“canvas”); const […]<\/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-3886","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3886","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=3886"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/3886\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=3886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=3886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=3886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}