{"id":39509,"date":"2023-11-06T02:13:14","date_gmt":"2024-02-04T01:26:28","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8angular-4%e6%93%8d%e4%bd%9ccanvas%e5%85%83%e7%b4%a0%e7%9a%84%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-04T07:44:53","modified_gmt":"2024-05-03T23:44:53","slug":"%e7%94%a8angular-4%e6%93%8d%e4%bd%9ccanvas%e5%85%83%e7%b4%a0%e7%9a%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e7%94%a8angular-4%e6%93%8d%e4%bd%9ccanvas%e5%85%83%e7%b4%a0%e7%9a%84%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u7528Angular 4\u64cd\u4f5ccanvas\u5143\u7d20\u7684\u65b9\u6cd5"},"content":{"rendered":"<h1>Angular 4\u7684\u8ba8\u8bba<\/h1>\n<p>\u6211\u7814\u7a76\u4e86\u4e00\u4e0b\u5982\u4f55\u5728Angular\u4e2d\u4e0eHTML5\u7684canvas\u5143\u7d20\u8fdb\u884c\u8fde\u63a5\u3002\u8fd9\u662f\u5728TypeScript 2.2\u548cAngular 4\u4e2d\u7684\u5199\u6cd5\u3002<\/p>\n<h2>\u52a8\u4f5c\u793a\u8303\u6837\u4f8b<\/h2>\n<p>\u6211\u5df2\u5c06\u52a8\u4f5c\u793a\u4f8b\u4e0a\u4f20\u5230\u4e86Plunker\u4e0a\u3002<\/p>\n<ul class=\"post-ul\">Angular 4 Example &#8211; How to use Canvas Element<\/ul>\n<h2>\u89e3\u91ca\u6b65\u9aa4<\/h2>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u5c06ID\u503c\u5206\u914d\u7ed9\u6a21\u677f\u4e2d\u7684\u9009\u62e9\u5668\u3002\u5206\u914dID\u503c\u7684\u65b9\u5f0f\u4f7f\u7528Angular\u7684\u8bed\u6cd5\u3002\uff08\u4f8b\uff1a<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\uff09<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u901a\u8fc7\u4f7f\u7528implements\u5173\u952e\u5b57\u6307\u5b9aAfterViewInit\u63a5\u53e3\u6765\u6307\u5b9a\u7c7b\u3002\u8fd9\u5c06\u5f3a\u5236\u5b9e\u73b0ngAfterViewInit()\u65b9\u6cd5\uff08\u751f\u547d\u5468\u671f\uff09\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u4f7f\u7528ViewChild\u6ce8\u89e3\u5c06ID\u503c\u4e0e\u7c7b\u7684\u6210\u5458\u53d8\u91cf\u5173\u8054\u8d77\u6765\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>\u5728ngAfterViewInit()\u65b9\u6cd5\u4e2d\uff0c\u53ef\u4ee5\u83b7\u53d6\u5230canvas\u5143\u7d20\u7684\u5f15\u7528\u3002\u6b64\u65f6\uff0cnativeElement\u5c5e\u6027\u5c06\u6210\u4e3a\u5bf9\u5e94HTML\u5143\u7d20\u7684\u539f\u59cb\u5143\u7d20\u3002<\/p>\n<h2>\u5177\u4f53\u7684\u7684\u7a0b\u5f0f\u78bc\u7bc4\u4f8b<\/h2>\n<p>\u8fd9\u662f\u4e00\u4e2a\u7528\u4e8e\u63a7\u5236HTML5 Canvas\u7684\u4ee3\u7801\u3002\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u6240\u4ee5\u4ee3\u7801\u5f88\u5c11\uff0c\u5bb9\u6613\u53c2\u8003\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span><span class=\"nx\">AfterViewInit<\/span><span class=\"p\">,<\/span> <span class=\"nx\">Component<\/span><span class=\"p\">,<\/span> <span class=\"nx\">DoCheck<\/span><span class=\"p\">,<\/span> <span class=\"nx\">ViewChild<\/span><span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">@angular\/core<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"p\">@<\/span><span class=\"nd\">Component<\/span><span class=\"p\">({<\/span>\r\n  <span class=\"na\">selector<\/span><span class=\"p\">:<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">app-root<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">template<\/span><span class=\"p\">:<\/span> <span class=\"s2\">`\r\n    &lt;div&gt;\r\n      &lt;canvas #myCanvas width=\"400\" height=\"400\"&gt;&lt;\/canvas&gt;\r\n      &lt;div&gt;\r\n        \u5e45 &lt;input type=\"range\" min=\"1\" max=\"400\" [(ngModel)]=\"rectW\"\/&gt;&lt;br\/&gt;\r\n        \u9ad8\u3055 &lt;input type=\"range\" min=\"1\" max=\"400\" [(ngModel)]=\"rectH\"\/&gt;&lt;br\/&gt;\r\n        \u5857\u308a\u306e\u8272 &lt;input type=\"color\" [(ngModel)]=\"rectColor\" placeholder=\"color\" value=\"{{rectColor}}\"\/&gt;\r\n      &lt;\/div&gt;\r\n    &lt;\/div&gt;\r\n  `<\/span><span class=\"p\">,<\/span>\r\n  <span class=\"na\">styles<\/span><span class=\"p\">:<\/span> <span class=\"p\">[<\/span><span class=\"s2\">`canvas {\r\n    background: lightgray;\r\n  }`<\/span><span class=\"p\">]<\/span>\r\n<span class=\"p\">})<\/span>\r\n<span class=\"k\">export<\/span> <span class=\"kd\">class<\/span> <span class=\"nx\">AppComponent<\/span> <span class=\"k\">implements<\/span> <span class=\"nx\">AfterViewInit<\/span><span class=\"p\">,<\/span> <span class=\"nx\">DoCheck<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nx\">rectW<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">100<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nx\">rectH<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">100<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nx\">rectColor<\/span> <span class=\"o\">=<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">#FF0000<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n  <span class=\"nl\">context<\/span><span class=\"p\">:<\/span> <span class=\"nx\">CanvasRenderingContext2D<\/span><span class=\"p\">;<\/span>\r\n\r\n  <span class=\"p\">@<\/span><span class=\"nd\">ViewChild<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">myCanvas<\/span><span class=\"dl\">'<\/span><span class=\"p\">)<\/span> <span class=\"nx\">myCanvas<\/span><span class=\"p\">;<\/span>\r\n\r\n  <span class=\"nx\">ngAfterViewInit<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c1\">\/\/ \u53c2\u7167\u3092\u3068\u308c\u308b<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">canvas<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">myCanvas<\/span><span class=\"p\">.<\/span><span class=\"nx\">nativeElement<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">context<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">canvas<\/span><span class=\"p\">.<\/span><span class=\"nx\">getContext<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">2d<\/span><span class=\"dl\">'<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">draw<\/span><span class=\"p\">();<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"cm\">\/** \u5024\u306e\u5909\u66f4\u6642\u3092\u76e3\u8996\u3059\u308b\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u30a4\u30d9\u30f3\u30c8 *\/<\/span>\r\n  <span class=\"nx\">ngDoCheck<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">draw<\/span><span class=\"p\">();<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"cm\">\/** Canvas\u8981\u7d20\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002 *\/<\/span>\r\n  <span class=\"nx\">draw<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"nx\">ctx<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">context<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"p\">(<\/span><span class=\"nx\">ctx<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"nx\">ctx<\/span><span class=\"p\">.<\/span><span class=\"nx\">clearRect<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"mi\">400<\/span><span class=\"p\">,<\/span> <span class=\"mi\">400<\/span><span class=\"p\">);<\/span>\r\n      <span class=\"nx\">ctx<\/span><span class=\"p\">.<\/span><span class=\"nx\">fillStyle<\/span> <span class=\"o\">=<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">rectColor<\/span><span class=\"p\">;<\/span>\r\n      <span class=\"nx\">ctx<\/span><span class=\"p\">.<\/span><span class=\"nx\">fillRect<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">rectW<\/span><span class=\"p\">,<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">rectH<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<\/code><\/pre>\n<h2>\u5177\u9ad4\u7684\u4f8b\u5b50 (j\u00f9 t\u01d0 de l\u00ec zi)<\/h2>\n<p>\u672c\u7f51\u7ad9\u300cHTML5 \u8bbe\u8ba1\u5de5\u5177 Particle Develop &#8211; ICS\u300d\u7684\u5f00\u53d1\u662f\u91c7\u7528\u4e86\u8fd9\u79cd\u65b9\u6cd5\u8fdb\u884c\u5b9e\u73b0\u7684\u3002\u5728\u5c4f\u5e55\u7684\u5de6\u4fa7\uff0cHTML5 Canvas \u7684\u5b9e\u73b0\u5e76\u4e0d\u662f\u76f4\u63a5\u8c03\u7528 API\uff0c\u800c\u662f\u4f7f\u7528\u4e86\u6846\u67b6\u300cCreateJS\u300d\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d3ae037434c4406c7f7ad\/12-0.png\" alt=\"\" \/><\/div>\n<h2>\u5c55\u671b<\/h2>\n<p>\u4f7f\u7528canvas\u5143\u7d20\u53ef\u4ee5\u5728\u56fe\u5f62\u7ed8\u5236\u548c\u53ef\u89c6\u5316\u65b9\u9762\u53d1\u6325\u4f5c\u7528\u3002\u7531\u4e8eAngular\u662f\u7ec4\u4ef6\u601d\u7ef4\uff0c\u6211\u89c9\u5f97\u5982\u679c\u589e\u52a0\u5305\u542bcanvas\u5143\u7d20\u7684\u7ec4\u4ef6\uff0c\u5927\u5bb6\u4f1a\u53d8\u5f97\u66f4\u52a0\u5feb\u4e50\u3002<\/p>\n<h2>\u4fee\u6539\u5386\u53f2<\/h2>\n<ul class=\"post-ul\">2017\/04\/20 : Angular 2 Beta\u304b\u3089Angular 4\u3078\u5909\u66f4\u3057\u307e\u3057\u305f<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Angular 4\u7684\u8ba8\u8bba \u6211\u7814\u7a76\u4e86\u4e00\u4e0b\u5982\u4f55\u5728Angular\u4e2d\u4e0eHTML5\u7684canvas\u5143\u7d20\u8fdb\u884c\u8fde\u63a5\u3002\u8fd9\u662f\u5728Ty [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-39509","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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>\u7528Angular 4\u64cd\u4f5ccanvas\u5143\u7d20\u7684\u65b9\u6cd5 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u7528angular-4\u64cd\u4f5ccanvas\u5143\u7d20\u7684\u65b9\u6cd5\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u7528Angular 4\u64cd\u4f5ccanvas\u5143\u7d20\u7684\u65b9\u6cd5\" \/>\n<meta property=\"og:description\" content=\"Angular 4\u7684\u8ba8\u8bba \u6211\u7814\u7a76\u4e86\u4e00\u4e0b\u5982\u4f55\u5728Angular\u4e2d\u4e0eHTML5\u7684canvas\u5143\u7d20\u8fdb\u884c\u8fde\u63a5\u3002\u8fd9\u662f\u5728Ty [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u7528angular-4\u64cd\u4f5ccanvas\u5143\u7d20\u7684\u65b9\u6cd5\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2024-02-04T01:26:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T23:44:53+00:00\" \/>\n<meta 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