{"id":9549,"date":"2024-03-15T03:17:04","date_gmt":"2024-03-14T18:17:04","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/canvas%e3%81%a7%e3%82%af%e3%83%bc%e3%83%ab%e3%81%a7%e7%b4%a0%e6%99%b4%e3%82%89%e3%81%97%e3%81%84%e3%83%91%e3%83%bc%e3%83%86%e3%82%a3%e3%82%af%e3%83%ab%e3%81%a8%e6%b5%81%e6%98%9f%e3%81%ae%e5%8a%b9\/"},"modified":"2025-08-04T02:21:54","modified_gmt":"2025-08-03T17:21:54","slug":"canvas%e3%81%a7%e3%82%af%e3%83%bc%e3%83%ab%e3%81%a7%e7%b4%a0%e6%99%b4%e3%82%89%e3%81%97%e3%81%84%e3%83%91%e3%83%bc%e3%83%86%e3%82%a3%e3%82%af%e3%83%ab%e3%81%a8%e6%b5%81%e6%98%9f%e3%81%ae%e5%8a%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/canvas%e3%81%a7%e3%82%af%e3%83%bc%e3%83%ab%e3%81%a7%e7%b4%a0%e6%99%b4%e3%82%89%e3%81%97%e3%81%84%e3%83%91%e3%83%bc%e3%83%86%e3%82%a3%e3%82%af%e3%83%ab%e3%81%a8%e6%b5%81%e6%98%9f%e3%81%ae%e5%8a%b9\/","title":{"rendered":"Canvas \u30d1\u30fc\u30c6\u30a3\u30af\u30eb\uff06\u6d41\u661f\u30a8\u30d5\u30a7\u30af\u30c8\u5b9f\u88c5\u30ac\u30a4\u30c9"},"content":{"rendered":"<p>\u9177\u70ab\u7684\u7c92\u5b50\u548c\u6d41\u661f\u6548\u679c\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u3001Canvas\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u63cf\u753b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3053\u306e\u52b9\u679c\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\uff1a<\/p>\n<ol>\n<li>HTML\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u4e2d\u306bCanvas\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-tag\">&lt;<span class=\"hljs-name\">canvas<\/span> <span class=\"hljs-attr\">id<\/span>=<span class=\"hljs-string\">\"canvas\"<\/span> <span class=\"hljs-attr\">width<\/span>=<span class=\"hljs-string\">\"800\"<\/span> <span class=\"hljs-attr\">height<\/span>=<span class=\"hljs-string\">\"600\"<\/span>&gt;<\/span><span class=\"hljs-tag\">&lt;\/<span class=\"hljs-name\">canvas<\/span>&gt;<\/span>\r\n<\/code><\/pre>\n<ol>\n<li>JavaScript\u3067\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3001\u30d1\u30fc\u30c6\u30a3\u30af\u30eb\u3068\u6d41\u661f\u306e\u52b9\u679c\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">const<\/span> canvas = <span class=\"hljs-variable language_\">document<\/span>.<span class=\"hljs-title function_\">getElementById<\/span>(<span class=\"hljs-string\">'canvas'<\/span>);\r\n<span class=\"hljs-keyword\">const<\/span> ctx = canvas.<span class=\"hljs-title function_\">getContext<\/span>(<span class=\"hljs-string\">'2d'<\/span>);\r\n\r\n<span class=\"hljs-keyword\">let<\/span> particles = [];\r\n\r\n<span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">createParticles<\/span>() {\r\n  <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; <span class=\"hljs-number\">100<\/span>; i++) {\r\n    <span class=\"hljs-keyword\">let<\/span> particle = {\r\n      <span class=\"hljs-attr\">x<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * canvas.<span class=\"hljs-property\">width<\/span>,\r\n      <span class=\"hljs-attr\">y<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * canvas.<span class=\"hljs-property\">height<\/span>,\r\n      <span class=\"hljs-attr\">speedX<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * <span class=\"hljs-number\">4<\/span> - <span class=\"hljs-number\">2<\/span>,\r\n      <span class=\"hljs-attr\">speedY<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * <span class=\"hljs-number\">4<\/span> - <span class=\"hljs-number\">2<\/span>,\r\n      <span class=\"hljs-attr\">color<\/span>: <span class=\"hljs-string\">'white'<\/span>,\r\n      <span class=\"hljs-attr\">size<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * <span class=\"hljs-number\">3<\/span> + <span class=\"hljs-number\">1<\/span>\r\n    };\r\n    particles.<span class=\"hljs-title function_\">push<\/span>(particle);\r\n  }\r\n}\r\n\r\n<span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">drawParticles<\/span>() {\r\n  ctx.<span class=\"hljs-title function_\">clearRect<\/span>(<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, canvas.<span class=\"hljs-property\">width<\/span>, canvas.<span class=\"hljs-property\">height<\/span>);\r\n  \r\n  <span class=\"hljs-keyword\">for<\/span> (<span class=\"hljs-keyword\">let<\/span> i = <span class=\"hljs-number\">0<\/span>; i &lt; particles.<span class=\"hljs-property\">length<\/span>; i++) {\r\n    <span class=\"hljs-keyword\">let<\/span> particle = particles[i];\r\n    \r\n    ctx.<span class=\"hljs-property\">fillStyle<\/span> = particle.<span class=\"hljs-property\">color<\/span>;\r\n    ctx.<span class=\"hljs-title function_\">beginPath<\/span>();\r\n    ctx.<span class=\"hljs-title function_\">arc<\/span>(particle.<span class=\"hljs-property\">x<\/span>, particle.<span class=\"hljs-property\">y<\/span>, particle.<span class=\"hljs-property\">size<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-property\">PI<\/span> * <span class=\"hljs-number\">2<\/span>);\r\n    ctx.<span class=\"hljs-title function_\">fill<\/span>();\r\n    \r\n    particle.<span class=\"hljs-property\">x<\/span> += particle.<span class=\"hljs-property\">speedX<\/span>;\r\n    particle.<span class=\"hljs-property\">y<\/span> += particle.<span class=\"hljs-property\">speedY<\/span>;\r\n    \r\n    <span class=\"hljs-keyword\">if<\/span> (particle.<span class=\"hljs-property\">x<\/span> &gt; canvas.<span class=\"hljs-property\">width<\/span> || particle.<span class=\"hljs-property\">x<\/span> &lt; <span class=\"hljs-number\">0<\/span>) {\r\n      particle.<span class=\"hljs-property\">speedX<\/span> *= -<span class=\"hljs-number\">1<\/span>;\r\n    }\r\n    <span class=\"hljs-keyword\">if<\/span> (particle.<span class=\"hljs-property\">y<\/span> &gt; canvas.<span class=\"hljs-property\">height<\/span> || particle.<span class=\"hljs-property\">y<\/span> &lt; <span class=\"hljs-number\">0<\/span>) {\r\n      particle.<span class=\"hljs-property\">speedY<\/span> *= -<span class=\"hljs-number\">1<\/span>;\r\n    }\r\n  }\r\n}\r\n\r\n<span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">createMeteor<\/span>() {\r\n  <span class=\"hljs-keyword\">let<\/span> meteor = {\r\n    <span class=\"hljs-attr\">x<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * canvas.<span class=\"hljs-property\">width<\/span>,\r\n    <span class=\"hljs-attr\">y<\/span>: <span class=\"hljs-number\">0<\/span>,\r\n    <span class=\"hljs-attr\">speedY<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * <span class=\"hljs-number\">4<\/span> + <span class=\"hljs-number\">2<\/span>,\r\n    <span class=\"hljs-attr\">color<\/span>: <span class=\"hljs-string\">'red'<\/span>,\r\n    <span class=\"hljs-attr\">size<\/span>: <span class=\"hljs-title class_\">Math<\/span>.<span class=\"hljs-title function_\">random<\/span>() * <span class=\"hljs-number\">5<\/span> + <span class=\"hljs-number\">2<\/span>\r\n  };\r\n  particles.<span class=\"hljs-title function_\">push<\/span>(meteor);\r\n}\r\n\r\n<span class=\"hljs-keyword\">function<\/span> <span class=\"hljs-title function_\">draw<\/span>() {\r\n  <span class=\"hljs-title function_\">createParticles<\/span>();\r\n  \r\n  <span class=\"hljs-built_in\">setInterval<\/span>(<span class=\"hljs-function\">() =&gt;<\/span> {\r\n    <span class=\"hljs-title function_\">createMeteor<\/span>();\r\n  }, <span class=\"hljs-number\">3000<\/span>);\r\n  \r\n  <span class=\"hljs-built_in\">setInterval<\/span>(<span class=\"hljs-function\">() =&gt;<\/span> {\r\n    <span class=\"hljs-title function_\">drawParticles<\/span>();\r\n  }, <span class=\"hljs-number\">1000<\/span> \/ <span class=\"hljs-number\">60<\/span>);\r\n}\r\n\r\n<span class=\"hljs-title function_\">draw<\/span>();\r\n<\/code><\/pre>\n<p>Canvas\u4e0a\u306b100\u500b\u306e\u767d\u3044\u7c92\u5b50\u3092\u63cf\u753b\u3057\u30013\u79d2\u3054\u3068\u306b\u8d64\u3044\u6d41\u308c\u661f\u3092\u751f\u6210\u3057\u307e\u3059\u3002\u7c92\u5b50\u306e\u901f\u5ea6\u3084\u4f4d\u7f6e\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u3067\u3001\u3055\u307e\u3056\u307e\u306a\u52b9\u679c\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u3088\u308a\u6d3e\u624b\u306a\u52b9\u679c\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30b3\u30fc\u30c9\u5185\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u8abf\u6574\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9177\u70ab\u7684\u7c92\u5b50\u548c\u6d41\u661f\u6548\u679c\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306b\u3001Canvas\u3092\u4f7f\u7528\u3057\u3066\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3092\u63cf\u753b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3053\u306e\u52b9\u679c\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u3059\uff1a HTML\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u4e2d\u306bCanvas\u8981\u7d20\u3092\u8ffd\u52a0\u3057\u3066\u304f [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1029,4054,56,2656,4052,4053],"class_list":["post-9549","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-canvas","tag-html5","tag-javascript","tag-2656","tag-4052","tag-4053"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Canvas \u30d1\u30fc\u30c6\u30a3\u30af\u30eb\uff06\u6d41\u661f\u30a8\u30d5\u30a7\u30af\u30c8\u5b9f\u88c5\u30ac\u30a4\u30c9 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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property=\"og:description\" content=\"Canvas\u3067\u30af\u30fc\u30eb\u306a\u30d1\u30fc\u30c6\u30a3\u30af\u30eb\u3068\u6d41\u661f\u30a8\u30d5\u30a7\u30af\u30c8\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u3092\u89e3\u8aac\u3002JavaScript\u3068HTML5\u3092\u4f7f\u3063\u3066\u3001Web\u30b5\u30a4\u30c8\u306b\u52d5\u304d\u306e\u3042\u308b\u8868\u73fe\u3092\u52a0\u3048\u307e\u3057\u3087\u3046\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/ja\/blog\/canvas\u3067\u30af\u30fc\u30eb\u3067\u7d20\u6674\u3089\u3057\u3044\u30d1\u30fc\u30c6\u30a3\u30af\u30eb\u3068\u6d41\u661f\u306e\u52b9\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-14T18:17:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-03T17:21:54+00:00\" \/>\n<meta name=\"author\" content=\"\u82bd\u4f9d, \u96e8\u591c\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta 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