{"id":101680,"date":"2019-06-24T14:13:27","date_gmt":"2019-06-24T05:13:27","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=101680"},"modified":"2024-05-06T11:55:32","modified_gmt":"2024-05-06T02:55:32","slug":"javascript%e3%81%a7%e5%9b%b3%e5%bd%a2%e3%82%92%e6%8f%8f%e7%94%bb%e3%83%bb%e5%8b%95%e3%81%8b%e3%81%99%e3%81%9f%e3%82%81%e3%81%aecanvas%e6%b4%bb%e7%94%a8%e8%a1%93%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/101680","title":{"rendered":"JavaScript\u3067\u56f3\u5f62\u3092\u63cf\u753b\u30fb\u52d5\u304b\u3059\u305f\u3081\u306eCanvas\u6d3b\u7528\u8853\uff01"},"content":{"rendered":"<p><div class=\"box_voice\"><b><br \/>\nJavaScript\u3067\u3069\u3084\u3063\u305f\u3089\u56f3\u5f62\u3092\u63cf\u753b\u3067\u304d\u308b\u3093\u3060\u308d\u3046<br \/>\n\u56f3\u5f62\u3092JavaScript\u3067\u5236\u5fa1\u30fb\u64cd\u4f5c\u3057\u3066\u307f\u305f\u3044<br \/>\n\u52b9\u7387\u3088\u304f\u56f3\u5f62\u3092\u63cf\u753b\u3067\u304d\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u3066\u307f\u305f\u3044<br \/>\n<\/b><\/div><\/p>\n<p>JavaScript\u306f\u57fa\u672c\u7684\u306a\u69cb\u6587\u3067\u30ed\u30b8\u30c3\u30af\u3092\u7d44\u307f\u7acb\u3066\u308b\u3060\u3051\u3067\u306a\u304f\u3001HTML5\u304b\u3089\u5c0e\u5165\u3055\u308c\u305fcanvas\u3092\u5229\u7528\u3057\u305f\u30b0\u30e9\u30d5\u30a3\u30ab\u30eb\u306a\u63cf\u753b\u51e6\u7406\u3082\u5f97\u610f\u3067\u3059\u3002<\/p>\n<p>\u3057\u304b\u3057\u3001Canvas API\u306f\u4e00\u822c\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u9055\u3063\u3066\u63cf\u753b\u306b\u7279\u5316\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u308c\u307e\u3067\u306eJavaScript\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u306f\u4e00\u5473\u9055\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u5358\u7d14\u306a\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b\u3060\u3051\u3067\u3082\u3069\u3053\u304b\u3089\u5b66\u7fd2\u3092\u59cb\u3081\u305f\u3089\u826f\u3044\u306e\u304b\u8ff7\u3046\u4eba\u3082\u5c11\u306a\u304f\u306a\u3044\u306f\u305a\u3002<\/p>\n<p>\u305d\u3053\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u521d\u5fc3\u8005\u3067\u3082\u4eca\u65e5\u304b\u3089JavaScript\u3067\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b\u305f\u3081\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5206\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u6700\u5f8c\u307e\u3067\u8aad\u3093\u3067\u7406\u89e3\u3092\u6df1\u3081\u3066\u9802\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n<p>\u4e00\u4eba\u3067\u3082\u591a\u304f\u306e\u65b9\u304cJavaScript\u306e\u4e0d\u5b89\u3092\u89e3\u6d88\u3067\u304d\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n<h2>JavaScript\u3067\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001JavaScript\u3067\u56f3\u5f62\u306e\u63cf\u753b\u3092\u59cb\u3081\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001Canvas\u306e\u4f7f\u3044\u65b9\u3068\u5b9f\u969b\u306e\u63cf\u753b\u624b\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>Canvas\u306e\u4f7f\u3044\u65b9<\/h3>\n<p>HTML5\u304b\u3089\u5c0e\u5165\u3055\u308c\u305fCanvas\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30b0\u30e9\u30d5\u30a3\u30ab\u30eb\u306a\u56f3\u5f62\u63cf\u753b\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3057\u305f\u3002JavaScript\u304b\u3089\u3059\u3079\u3066\u5236\u5fa1\u53ef\u80fd\u306a\u306e\u3067\u3001\u30b2\u30fc\u30e0\u958b\u767a\u3084\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306a\u3069\u306b\u3082\u3088\u304f\u4f7f\u308f\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Canvas\u306e\u4f7f\u3044\u65b9\u306f\u7c21\u5358\u3067\u3001\u3082\u3063\u3068\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u306e\u306fHTML\u306bcanvas\u8981\u7d20\u3092\u914d\u7f6e\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\n<canvas id=\"canvas\" width=\"600\" height=\"400\"><\/canvas>\r\n<\/pre>\n<p>width \/ height\u5c5e\u6027\u3082\u540c\u6642\u306b\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u3067Canvas\u306e\u30b5\u30a4\u30ba\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>JavaScript\u304b\u3089\u3053\u306eCanvas\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f\u3001\u901a\u5e38\u306eHTML\u8981\u7d20\u3068\u540c\u3058\u3088\u3046\u306b\u53d6\u5f97\u3059\u308c\u3070\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst canvas = document.getElementById('canvas');\r\n<\/pre>\n<p>\u4ed6\u306e\u4f7f\u3044\u65b9\u3068\u3057\u3066\u3001\u3059\u3079\u3066<b>JavaScript\u5185\u3067Canvas\u3092\u69cb\u7bc9\u3059\u308b<\/b>\u3068\u3044\u3046\u3084\u308a\u65b9\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306fcreateElement()\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3057\u3066\u52d5\u7684\u306bCanvas\u8981\u7d20\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst canvas = document.createElement('canvas');\r\n  \r\ncanvas.width = 600;\r\ncanvas.height = 400;\r\n\r\ndocument.body.appendChild(canvas);\r\n<\/pre>\n<p>\u3053\u3061\u3089\u306e\u65b9\u6cd5\u3067\u3082width \/ height\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u53ef\u80fd\u3067\u3059\u3002\u307e\u305f\u3001\u6700\u5f8c\u306bappendChild()\u3067HTML\u306b\u51fa\u529b\u3057\u306a\u3044\u3068\u8868\u793a\u3055\u308c\u306a\u3044\u70b9\u306b\u306f\u6ce8\u610f\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u3053\u3053\u307e\u3067\u306e\u4f5c\u696d\u3067Canvas\u3092JavaScript\u304b\u3089\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u304c\u3001\u56f3\u5f62\u306a\u3069\u3092\u63cf\u753b\u3059\u308bAPI\u3092\u5229\u7528\u3059\u308b\u306b\u306fCanvas\u304c\u6301\u30642d\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3092\u53d6\u5f97\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u307e\u305b\u3093\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst ctx = canvas.getContext('2d');\r\n<\/pre>\n<p>\u3053\u308c\u3067\u5909\u6570ctx\u304b\u3089\u3055\u307e\u3056\u307e\u306a\u56f3\u5f62\u3092\u7c21\u5358\u306b\u63cf\u753b\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3>\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001\u7c21\u5358\u306a\u56f3\u5f62\u3092\u63cf\u753b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u56db\u89d2\u5f62\u3092\u63cf\u753b\u3059\u308b\u306b\u306fstrokeRect() \/ fillRect()\u3068\u3044\u3046\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nctx.strokeRect(0,0,80,80);\r\n\r\nctx.fillRect(100,0,80,80);\r\n<\/pre>\n<p>\u3069\u3061\u3089\u3082\u5f15\u6570\u306b\u8a2d\u5b9a\u3059\u308b\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u3010X\u5ea7\u6a19, Y\u5ea7\u6a19, \u5e45, \u9ad8\u3055\u3011\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002strokeRect()\u306f\u8f2a\u90ed\u7dda\u3060\u3051\u3067fillRect()\u306f\u5857\u308a\u3064\u3076\u3057\u3067\u63cf\u753b\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/54.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-101681\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/54.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/54-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/54-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/54-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">Canvas API\u306b\u3088\u308b\u56f3\u5f62\u306e\u63cf\u753b<\/div><\/p>\n<p>\u3053\u306e\u3088\u3046\u306b\u5ea7\u6a19\u3068\u30b5\u30a4\u30ba\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u7c21\u5358\u306b\u63cf\u753b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u56f3\u5f62\u306e\u30b9\u30bf\u30a4\u30eb\u3082\u6b21\u306e\u3088\u3046\u306b\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nctx.strokeStyle = 'red';\r\n\r\nctx.fillStyle = 'blue';\r\n<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/63.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-101683\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/63.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/63-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/63-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/63-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">\u30b9\u30bf\u30a4\u30eb\u3092\u9069\u7528\u3057\u305f\u56f3\u5f62\u306e\u63cf\u753b<\/div><\/p>\n<p>\u30ab\u30e9\u30fc\u306e\u6307\u5b9a\u306fCSS\u3067\u3088\u304f\u4f7f\u3046\u3010#f00\u3011\u306e\u3088\u3046\u306a\u8a18\u8ff0\u3067\u3082\u554f\u984c\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<h2>\u56f3\u5f62\u306e\u5236\u5fa1\u30fb\u64cd\u4f5c<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u63cf\u753b\u3057\u305f\u56f3\u5f62\u3092JavaScript\u3067\u5236\u5fa1\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001\u56f3\u5f62\u306e\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3068\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>\u56f3\u5f62\u3092\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3055\u305b\u3088\u3046<\/h3>\n<p>\u63cf\u753b\u3055\u308c\u305f\u56f3\u5f62\u3092\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u8868\u793a\u3055\u305b\u308bAPI\u306fCanvas\u306b\u7121\u3044\u306e\u3067\u3001\u6a19\u6e96\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306b\u306f<b>requestAnimationFrame()<\/b>\u3092\u5229\u7528\u3059\u308b\u306e\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u3053\u308c\u306f\u3001\u5404\u7a2e\u30d6\u30e9\u30a6\u30b6\u306e\u74b0\u5883\u306b\u9069\u5fdc\u3057\u305f\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u3092\u30d5\u30ec\u30fc\u30e0\u5358\u4f4d\u3067\u6700\u9069\u5316\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nfunction draw() {\r\n\r\n    \/\/ \u3053\u3053\u306b\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\r\n\r\n\r\n    window.requestAnimationFrame(draw);\r\n}\r\n  \r\ndraw();\r\n<\/pre>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001draw()\u3068\u3044\u3046\u95a2\u6570\u3092\u4f5c\u6210\u3057\u3066\u3053\u308c\u3092requestAnimationFrame()\u306e\u5f15\u6570\u306b\u8a2d\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001draw()\u3092\u5b9f\u884c\u3059\u308b\u3068\u7e70\u308a\u8fd4\u3057\u51e6\u7406\uff08\u30eb\u30fc\u30d7\uff09\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u3002<\/p>\n<p>\u3042\u3068\u306f\u3001\u56f3\u5f62\u306e\u5ea7\u6a19\u3092\u610f\u56f3\u7684\u306b\u5909\u3048\u3066\u3084\u308c\u3070\u826f\u3044\u308f\u3051\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u6a2a\u65b9\u5411\u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3055\u305b\u305f\u3051\u308c\u3070X\u5ea7\u6a19\u306e\u5024\u3092\u5909\u5316\u3055\u305b\u308c\u3070\u826f\u3044\u3067\u3059\u3088\u306d\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nctx.fillRect(\u3010X\u5ea7\u6a19\u3011,50, 100, 100);    \r\n<\/pre>\n<p>\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u306b\u843d\u3068\u3057\u8fbc\u3080\u3068\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nlet x = 0;\r\n\r\nfunction draw() {\r\n    ctx.clearRect(0,0,canvas.width,canvas.height);\r\n    ctx.fillRect(x++,50, 100, 100);\r\n    \r\n    window.requestAnimationFrame(draw);\r\n}\r\n  \r\ndraw();\r\n<\/pre>\n<p>clearRect()\u3092\u5b9f\u884c\u3059\u308b\u3068<b>\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u305f\u63cf\u753b\u3092\u30ad\u30ec\u30a4\u306b\u524a\u9664<\/b>\u3057\u3066\u304f\u308c\u307e\u3059\u3002\u3053\u308c\u3092\u5b9f\u884c\u3057\u306a\u3044\u3068\u524d\u306b\u63cf\u753b\u3055\u308c\u305f\u8868\u793a\u304c\u305d\u306e\u307e\u307e\u6b8b\u3063\u3066\u3057\u307e\u3044\u3001\u56f3\u5f62\u304c\u91cd\u306a\u3063\u3066\u8868\u793a\u3055\u308c\u3066\u3057\u307e\u3046\u306e\u3067\u6ce8\u610f\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u5b9f\u884c\u3059\u308b\u3068\u3001\u56f3\u5f62\u304c\u6a2a\u65b9\u5411\u306b\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u306e\u304c\u5206\u304b\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n<p>\u6b21\u306b\u3001Canvas\u4e0a\u3078\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u3092\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3068\u3001\u4f8b\u3048\u3070\u30e6\u30fc\u30b6\u30fc\u304c\u30af\u30ea\u30c3\u30af\u3057\u305f\u6642\u3084\u30ad\u30fc\u3092\u5165\u529b\u3057\u305f\u6642\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u30a4\u30d9\u30f3\u30c8\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Canvas\u8981\u7d20\u3092\u30af\u30ea\u30c3\u30af\u3057\u305f\u6642\u306e\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\ncanvas.addEventListener('click', (e) => {\r\n\r\n    \/\/ \u3053\u3053\u306b\u51e6\u7406\u3092\u8a18\u8ff0\u3059\u308b\r\n\r\n});\r\n<\/pre>\n<p>HTML\u8981\u7d20\u306b\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u306e\u3068\u540c\u3058\u3088\u3046\u306b\u3001Canvas\u8981\u7d20\u306b\u5bfe\u3057\u3066<b>addEventListener()<\/b>\u3092\u7d10\u4ed8\u3051\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u6b21\u306b\u3001\u30a4\u30d9\u30f3\u30c8\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u30de\u30a6\u30b9\u306eX\u5ea7\u6a19\u3092\u53d6\u5f97\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\ncanvas.addEventListener('click', (e) => {\r\n\r\n    console.log(e.clientX);\r\n\r\n});\r\n<\/pre>\n<p>clientX\u30d7\u30ed\u30d1\u30c6\u30a3\u304b\u3089\u30af\u30ea\u30c3\u30af\u3057\u305f\u6642\u306e\u30de\u30a6\u30b9\u306eX\u5ea7\u6a19\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u540c\u3058\u3088\u3046\u306b\u3001clientY\u30d7\u30ed\u30d1\u30c6\u30a3\u304b\u3089Y\u5ea7\u6a19\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u4ed5\u7d44\u307f\u3092\u5fdc\u7528\u3057\u3066\u3001\u30af\u30ea\u30c3\u30af\u3057\u305f\u3068\u3053\u308d\u306b\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b\u6a5f\u80fd\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u3087\u3046\uff01<\/p>\n<pre class=\"lang:js decode:true\">\r\ncanvas.addEventListener('click', (e) => {\r\n    \r\n    ctx.strokeRect(e.clientX, e.clientY,10, 10);\r\n\r\n});\r\n<\/pre>\n<p>\u3053\u306e\u3088\u3046\u306b\u3001X \/ Y\u5ea7\u6a19\u306b\u30de\u30a6\u30b9\u306e\u4f4d\u7f6e\u3092\u6307\u5b9a\u3059\u308c\u3070\u826f\u3044\u3067\u3059\u306d\u3002<\/p>\n<p>\u5b9f\u884c\u3059\u308b\u3068\u6b21\u306e\u3088\u3046\u306b\u30af\u30ea\u30c3\u30af\u3057\u305f\u5834\u6240\u306b\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff01<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/83.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-101685\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/83.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/83-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/83-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/83-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">Canvas\u306b\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u3092\u9069\u7528\u3057\u305f\u4e8b\u4f8b<\/div><\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u306e\u5b9f\u88c5\u65b9\u6cd5\u306b\u307e\u3060\u4e0d\u5b89\u306e\u3042\u308b\u65b9\u306f\u3001\u6b21\u306e\u8a18\u4e8b\u3067\u57fa\u672c\u304b\u3089\u5fdc\u7528\u307e\u3067\u4f53\u7cfb\u7684\u306b\u5b66\u3079\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u3066\u3044\u308b\u306e\u3067\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/61631\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/08\/javascript-tutorial-top-150x86.png\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010JavaScript\u5165\u9580\u3011\u521d\u5fc3\u8005\u3067\u3082\u5206\u304b\u308b\u30a4\u30d9\u30f3\u30c8\u51e6\u7406\u306e\u4f5c\u308a\u65b9\u307e\u3068\u3081\uff01<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u6d3b\u7528<\/h2>\n<p>\u3053\u306e\u7ae0\u3067\u306f\u3001\u56f3\u5f62\u63cf\u753b\u306b\u7279\u5316\u3057\u305fJavaScript\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002\u4e3b\u306b\u3001Graphics.js\u306e\u5c0e\u5165\u304b\u3089\u56f3\u5f62\u63cf\u753b\u306b\u3064\u3044\u3066\u5b66\u3093\u3067\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>Graphics.js\u306e\u5c0e\u5165<\/h3>\n<p>Graphics.js\u306f\u8efd\u91cf\u3067\u4eee\u60f3DOM\u306a\u3069\u3092\u5229\u7528\u3057\u305f\u9ad8\u901f\u306a\u52d5\u4f5c\u304c\u9b45\u529b\u3067\u3042\u308a\u3001SVG\u5f62\u5f0f\u3067\u753b\u9762\u306b\u51fa\u529b\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u306a\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>Graphics.js\u3092\u5c0e\u5165\u3059\u308b\u306e\u306f\u7c21\u5358\u3067\u3001script\u30bf\u30b0\u304b\u3089\u6b21\u306e\u3088\u3046\u306b\u8aad\u307f\u8fbc\u3080\u3060\u3051\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\n<script src=\"https:\/\/cdn.anychart.com\/js\/latest\/graphics.min.js\"><\/script>\r\n<\/pre>\n<p>\u3042\u3068\u306f\u3001\u63cf\u753b\u3057\u305f\u3044\u7b87\u6240\u306b\u6b21\u306e\u3088\u3046\u306a\u8981\u7d20\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\n<div id=\"stage\" style=\"width: 400px; height: 375px;\"><\/div>\r\n<\/pre>\n<p>\u30b9\u30bf\u30a4\u30eb\u3082\u4e00\u7dd2\u306b\u8a18\u8ff0\u3057\u3066\u3044\u307e\u3059\u304c\u3001CSS\u30d5\u30a1\u30a4\u30eb\u306a\u3069\u3067\u5225\u306b\u8a18\u8ff0\u3057\u3066\u3082\u554f\u984c\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n<p>JavaScript\u304b\u3089\u64cd\u4f5c\u3059\u308b\u306b\u306f\u6b21\u306e1\u884c\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nconst stage = acgraph.create('stage');\r\n<\/pre>\n<p>acgraph.create()\u306e\u5f15\u6570\u306b\u306f\u3001\u5148\u307b\u3069HTML\u306b\u914d\u7f6e\u3057\u305fdiv\u8981\u7d20\u306e<b>ID\u5c5e\u6027\u540d<\/b>\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u3042\u3068\u306f\u3001\u5909\u6570stage\u3092\u5229\u7528\u3057\u3066\u81ea\u7531\u306b\u63cf\u753b\u3092\u884c\u3046\u3053\u3068\u304c\u51fa\u6765\u307e\u3059\u3002<\/p>\n<h3>\u56f3\u5f62\u3092\u63cf\u753b\u3057\u3066\u307f\u3088\u3046<\/h3>\n<p>\u305d\u308c\u3067\u306f\u3001Graphics.js\u3092\u5229\u7528\u3057\u3066\u7c21\u5358\u306a\u56f3\u5f62\u3092\u63cf\u753b\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u57fa\u672c\u7684\u306a\u8003\u3048\u65b9\u306fCanvas\u3092\u5229\u7528\u3057\u305f\u6642\u3068\u540c\u3058\u3067\u3059\u304c\u3001\u8a18\u8ff0\u306f\u3082\u3046\u5c11\u3057<b>\u7c21\u7565\u5316\u3055\u308c\u3066\u3044\u308b<\/b>\u306e\u304c\u7279\u5fb4\u3067\u3059\u3002\u4f8b\u3048\u3070\u3001\u56db\u89d2\u5f62\u3092\u63cf\u753b\u3059\u308b\u306b\u306f\u6b21\u306e\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nstage.rect(0, 0, 100, 100);\r\n\r\nstage.rect(150,0,100,100).fill('blue');\r\n<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/92.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-101684\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/92.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/92-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/92-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/92-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">Graphics.js\u306b\u3088\u308b\u56f3\u5f62\u306e\u63cf\u753b<\/div><\/p>\n<p>Canvas\u3067\u306fstrokeRect() \/ fillRect()\u3068\u3044\u30462\u7a2e\u985e\u306b\u5206\u3051\u3089\u308c\u3066\u3044\u305f\u3082\u306e\u304c\u3001Graphis.js\u306frect()\u30e1\u30bd\u30c3\u30c91\u3064\u3067\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002\u30b9\u30bf\u30a4\u30eb\u3092\u8a2d\u5b9a\u3059\u308b\u969b\u3082\u3001\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067fill()\u3092\u5b9f\u884c\u3059\u308b\u3060\u3051\u306e\u624b\u8efd\u3055\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u9762\u767d\u3044\u306e\u306f\u30ab\u30e9\u30fc\u306e\u6307\u5b9a\u3092\u914d\u5217\u306b\u3059\u308b\u3060\u3051\u3067\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u3092\u8868\u73fe\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nstage.rect(150,0,100,100).fill(['red','blue'],45);\r\n<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/101.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-101687\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/101.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/101-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/101-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/101-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">Graphics.js\u306b\u3088\u308b\u30ab\u30e9\u30fc\u306e\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u5316<\/div><\/p>\n<p>fill([\u3010\u8272\u3011,\u3010\u8272\u3011],\u3010\u89d2\u5ea6\u3011)\u306e\u3088\u3046\u306b\u3001\u8272\u306e\u914d\u5217\u3068\u30b0\u30e9\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u89d2\u5ea6\u3092\u8a2d\u5b9a\u3059\u308b\u3060\u3051\u3067\u3059\u3002<\/p>\n<p>\u307e\u305f\u3001\u5ea7\u6a19\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3067\u81ea\u7531\u306b\u7dda\u3092\u63cf\u753b\u3059\u308b\u306e\u3082\u7c21\u5358\u306b\u306a\u3063\u3066\u3044\u3066\u3001\u4e00\u9023\u306e\u6d41\u308c\u3092\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u9023\u7d50\u3057\u3066\u3044\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:js decode:true\">\r\nstage.path()\r\n    .moveTo(5, 305)\r\n    .lineTo(175, 5)\r\n    .lineTo(355, 305)\r\n    .lineTo(5, 305);\r\n<\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/111.png\" alt=\"\" width=\"800\" height=\"400\" class=\"alignnone size-full wp-image-101686\" srcset=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/111.png 800w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/111-150x75.png 150w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/111-300x150.png 300w, https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2019\/06\/111-640x320.png 640w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\n<div class=\"img-caption\">Graphics.js\u306b\u3088\u308b\u7dda\u306e\u63cf\u753b<\/div><\/p>\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001lineTo()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u4e09\u89d2\u5f62\u3092\u7dda\u3067\u63cf\u753b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>Canvas\u3067\u3082\u4f3c\u305f\u3088\u3046\u306a\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001\u3088\u308a\u7c21\u7565\u5316\u3055\u308c\u3066\u52b9\u7387\u3088\u304f\u63cf\u753b\u3067\u304d\u308b\u306e\u3067\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u4eca\u56de\u306f\u3001JavaScript\u3067\u56f3\u5f62\u3092\u63cf\u753b\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u7fd2\u3057\u3066\u304d\u307e\u3057\u305f\uff01<\/p>\n<p>\u6700\u5f8c\u306b\u3001\u3082\u3046\u4e00\u5ea6\u30dd\u30a4\u30f3\u30c8\u3092\u304a\u3055\u3089\u3044\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\uff01<\/p>\n<div class=\"box01\">\n<ul>\n<li>Canvas\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u30b0\u30e9\u30d5\u30a3\u30ab\u30eb\u306a\u63cf\u753b\u3092\u5b9f\u73fe\u3067\u304d\u308b<\/li>\n<li>\u6a19\u6e96\u3067\u63d0\u4f9b\u3055\u308c\u3066\u3044\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u56f3\u5f62\u3092\u5236\u5fa1\u30fb\u64cd\u4f5c\u3067\u304d\u308b<\/li>\n<li>\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u6d3b\u7528\u3059\u308c\u3070\u3088\u308a\u52b9\u7387\u7684\u306b\u56f3\u5f62\u3092\u63cf\u753b\u3067\u304d\u308b<\/li>\n<\/ul>\n<\/div>\n<p>\u4e0a\u8a18\u5185\u5bb9\u3092\u8e0f\u307e\u3048\u3066\u3001\u305c\u3072\u81ea\u5206\u3067\u3082\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u53d6\u308a\u5165\u308c\u3066\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u9811\u5f35\u308a\u307e\u3057\u3087\u3046\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript\u3067\u3069\u3084\u3063\u305f\u3089\u56f3\u5f62\u3092\u63cf\u753b\u3067\u304d\u308b\u3093\u3060\u308d\u3046 \u56f3\u5f62\u3092JavaScript\u3067\u5236\u5fa1\u30fb\u64cd\u4f5c\u3057\u3066\u307f\u305f\u3044 \u52b9\u7387\u3088\u304f\u56f3\u5f62\u3092\u63cf\u753b\u3067\u304d\u308b\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u4f7f\u3063\u3066\u307f\u305f\u3044 JavaScript\u306f\u57fa\u672c\u7684\u306a\u69cb\u6587\u3067\u30ed\u30b8\u30c3\u30af\u3092\u7d44\u307f\u7acb\u3066\u308b\u3060\u3051\u3067 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":101711,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2345],"tags":[],"class_list":["post-101680","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript-start"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ 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