Then we add a script tag so we can define the behavior of the object.\n<\/p>\n\n
\n \n \n \n \n HTML Canvas Example<\/title>\n <\/head>\n <body> <h1><a href="http://www.miracleart.cn/">国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂</a></h1>\n <canvas>\n\n\n\n<p>Wowu !!! We get the output.<\/p>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467309470040.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<p>Looking at the structure of the code. We define canvas wrapper having an id attribute, this is can only be done by id and not class because of uniqueness which is used to reference the canvas with the id name.<br>\nTo access this we need to retrieve the node created in the Document Object Model(DOM) by using the getElementById(\"myCanvas\") and have access to it using the getContext(\"2d\") method.<\/p>\n\n<p>This method make us to have access to different drawing methods like<\/p>\n\n<\/pre><\/pre>\n<ul>\n<li>\nfillRect(x, y, width, height): This method is to draw a filled rectangle at a position(x, y) with a specified width and height.<\/li>\n<li>\nfillStyle = colorName: It is a property to set the color for the object. It could be a colorname, RGB or hex code for the object.<\/li>\n<\/ul>\n\n<p>Other methods are:<\/p>\n\n<ul>\n<li>\nstrokeRect(x, y, width, height): This method to to make a outline stroke on the rectangle, this may be used independently or combined with fillStyle and fillRect(x, y, width, height).<\/li>\n<li>\nclearRect(x, y, width, height): to clear the rectangle by making it transparent.<\/li>\n<\/ul>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467309545713.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<hr>\n<h2>\n \n \n ? <strong>Drawing basics<\/strong>\n<\/h2>\n\n<p>Different shapes and lines can be drawn using some specific methods depending on the object.<\/p>\n<h4>\n \n \n 1. Path:\n<\/h4>\n\n<p>Examples are line, wavy line, zigzag e.t.c<\/p>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467309649925.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<p>For creating a line, the following method needs to be set up:<\/p>\n\n<ul>\n<li>\nbeginPath(): This method is to start a new path for a drawing.<\/li>\n<li>\nmoveTo(x, y): This is to move the drawing to the specified points.<\/li>\n<li>\nlineTo(x, y): This is to draw from the current position to the specified points.<\/li>\n<li>\nstroke(): This is to draw the line.<\/li>\n<\/ul>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467309776138.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n<h4>\n \n \n 2. Rectangle and Square\n<\/h4>\n\n<ul>\n<li>Rectangle<\/li>\n<\/ul>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467309977240.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<ul>\n<li>Square <\/li>\n<\/ul>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467310125861.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<p>These following methods are used in creating a rectangle or square:<\/p>\n\n<ul>\n<li>\nfillRect: this method is for create rectangle and square only.<\/li>\n<li>\nclearRect(x, y, width, height): this method is to clear rectangle hence making it transparent.<\/li>\n<li>\nstrokeRect(x, y, width, height): is used to create an outline rectangle or square.<\/li>\n<li>\nfillStyle: this is used to fill the container of the rectangle or square.<\/li>\n<li>\nstrokeStyle: this method is for add stroke color to an outline rectangle.<\/li>\n<li>\nroundRect(x, y, width, height, radii): this method is for creating round border rectangle.<\/li>\n<\/ul>\n<h4>\n \n \n 3. Circle\n<\/h4>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467310240234.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><br>\n These following methods are used in creating a circle:<\/p>\n\n<ul>\n<li>\nbeginPath(): this method to begin a path.<\/li>\n<li>\narc(x, y, radius, startAngle, endAngle, anticlockwise): this is for to create circle where x and y is for center coordinate of the center, radius is the radius of the circle, startAngle and endAngle which is an angle for the circle.<\/li>\n<\/ul>\n<h4>\n \n \n 4. Polygon\n<\/h4>\n\n<p>To create a polygon, you need to determine the sides of the shape, it could be a triangle(3 sides), pentagon (5 sides), hexagon(6 sides) or decagon (10 sides).<\/p>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467310482546.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<p>These following methods are used in creating a circle:<\/p>\n\n<ul>\n<li>\nbeginPath(): this method is to create a new shape.<\/li>\n<li>\nclosePath(): this method is to end the shape.<\/li>\n<li>\ncx: its value for the center of x co-ordinates.<\/li>\n<li>\ncy: its value specifies the center for y co-ordinates.<\/li>\n<li>\nradius: radius of the shape.<\/li>\n<\/ul>\n\n<p>To get the angle, you have to calculate with this formula by dividing the circle into two;<br>\n<\/p>\n\n<pre>angle = 2π\(zhòng)/ n\n<\/pre>\n\n\n\n<p>其中 π 為 3.14； n 是邊數(shù)。您還必須減去 π\(zhòng)/2 才能獲得形狀從上到下的位置。<br>\n<img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467310570500.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467310736585.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n\n<hr>\n\n<h2>\n \n \n ？ <strong>帶有 <canvas> 的文本<\/canvas><\/strong>\n<\/h2>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467310927100.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n<p>要?jiǎng)?chuàng)建文本，使用以下方法：<\/p>\n<ul>\n<li>\nfont：指定字體大小和字體系列。<\/li>\n<li>\nfillStyle：這是給文本添加顏色。<\/li>\n<li>\nfillText：繪制填充文本。<\/li>\n<li>\n描邊文本：繪制輪廓文本<\/li>\n<li>\ncreateLinearGradient 或 createRadialGradient：為文本添加漸變<\/li>\n<li>\ntextAlign: 設(shè)置文本水平<\/li>\n<\/ul>\n\n<p><img src=\"https:\/\/img.php.cn\/upload\/article\/000\/000\/000\/173467311025343.jpg\" alt=\"HTML Canvas Made Simple: A Guide for Beginners.\"><\/p>\n\n\n<hr>\n\n<h2>\n \n \n <strong>結(jié)論<\/strong>\n<\/h2>\n\n<p>使用 HTML <canvas>可以幫助動(dòng)態(tài)繪制圖形。至此，您已經(jīng)學(xué)會了如何使用canvas進(jìn)行繪制，包括它的用途和重要性，這是稍后創(chuàng)建復(fù)雜圖形的基礎(chǔ)。<\/canvas><\/p>\n\n<h3>\n \n \n <strong>與我聯(lián)系<\/strong>\n<\/h3>\n\n<p>有關(guān) Web 開發(fā)的更多文章。在 Linkedin 和 X 上關(guān)注我<br>\nLinkedin X<\/p>\n\n\n \n\n \n "} </script> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <script>var V_PATH="/";window.onerror=function(){ return true; };</script> </head> <body data-commit-time="2023-12-28T14:50:12+08:00" class="editor_body body2_2"> <link rel="stylesheet" type="text/css" href="/static/csshw/stylehw.css"> <header> <div id="377j5v51b" class="head"> <div id="377j5v51b" class="haed_left"> <div id="377j5v51b" class="haed_logo"> <a href="http://www.miracleart.cn/zh/" title="" class="haed_logo_a"> <img src="/static/imghw/logo.png" alt="" class="haed_logoimg"> </a> </div> <div id="377j5v51b" class="head_nav"> <div 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Canvas 變得簡單：初學(xué)者指南。</span> </div> <div id="377j5v51b" class="Articlelist_txts"> <div id="377j5v51b" class="Articlelist_txts_info"> <h1 class="Articlelist_txts_title">HTML Canvas 變得簡單：初學(xué)者指南。</h1> <div id="377j5v51b" class="Articlelist_txts_info_head"> <div id="377j5v51b" class="author_info"> <a href="http://www.miracleart.cn/zh/member/1468492.html" class="author_avatar"> <img class="lazy" data-src="https://img.php.cn/upload/avatar/000/000/001/66ea8147b1057383.png" src="/static/imghw/default1.png" alt="Mary-Kate Olsen"> </a> <div id="377j5v51b" class="author_detail"> <a href="http://www.miracleart.cn/zh/member/1468492.html" class="author_name">Mary-Kate Olsen</a> </div> </div> </div> <span id="377j5v51b" class="Articlelist_txts_time">Dec 20, 2024 pm 01:38 PM</span> </div> </div> <hr /> <div id="377j5v51b" class="article_main php-article"> <div id="377j5v51b" class="article-list-left detail-content-wrap content"> <ins class="adsbygoogle" style="display:block; text-align:center;" data-ad-layout="in-article" data-ad-format="fluid" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3461856641"> </ins> <h3> <strong>目錄</strong> </h3> <ol> <li>簡介</li> <li>開始使用 </li> <li>繪畫基礎(chǔ)知識</li> <li>添加文本</li> <li>結(jié)論和后續(xù)步驟 </li> </ol> <h2> ？ <strong>簡介</strong> </h2> <p>HTML 是一個(gè)帶有標(biāo)簽 <canvas> 的 HTML 元素。用于通過 Javascript 繪制二維或三維圖形。 是一個(gè)包裝器，可以通過 javascript 操作來創(chuàng)建文本、圖像、形狀、動(dòng)畫，以創(chuàng)建具有視覺吸引力的交互式元素。</canvas></p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467309376509.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p><canvas>的使用適用于所有瀏覽器和設(shè)備，這使開發(fā)人員可以靈活地創(chuàng)建令人驚嘆的圖形。 </canvas></p> <h4> HTML <canvas> 的用例 </canvas> </h4> <ul> <li>繪制形狀和線條：它可以繪制形狀、圖案和線條，包括為對象添加顏色和漸變。</li> <li>動(dòng)畫和交互：<canvas>創(chuàng)建的對象可以是動(dòng)畫，也可以是用戶交互</canvas> </li> <li>圖像操作：這可用于調(diào)整圖像大小或裁剪圖像。</li> <li>游戲圖形：游戲開發(fā)者也用它來創(chuàng)建漂亮的游戲用戶界面</li> <li>數(shù)據(jù)可視化：用于創(chuàng)建圖形和圖表。</li> </ul> <hr> <h2> ?<strong>開始</strong> </h2> <p>HTML <canvas>;在 HTML 文件中使用，可以在 script 標(biāo)記中進(jìn)行內(nèi)部操作，也可以在 javascript 文件中進(jìn)行外部操作。如果沒有這個(gè)，畫布對象將不會顯示。 <br> 首先，我們必須創(chuàng)建一個(gè) index.html 文件并包含要?jiǎng)?chuàng)建的對象的 <canvas> 包裝器。<br> </canvas></canvas></p> <pre class="brush:php;toolbar:false"><!doctype html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>HTML Canvas Example</title> </head> <body> <canvas> <p>Then we add a script tag so we can define the behavior of the object.<br> </p> <pre class="brush:php;toolbar:false"><!doctype html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>HTML Canvas Example</title> </head> <body> <canvas> <p>Wowu !!! We get the output.</p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467309470040.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p>Looking at the structure of the code. We define canvas wrapper having an id attribute, this is can only be done by id and not class because of uniqueness which is used to reference the canvas with the id name.<br> To access this we need to retrieve the node created in the Document Object Model(DOM) by using the getElementById("myCanvas") and have access to it using the getContext("2d") method.</p> <p>This method make us to have access to different drawing methods like</p> </pre></pre> <ul> <li> fillRect(x, y, width, height): This method is to draw a filled rectangle at a position(x, y) with a specified width and height.</li> <li> fillStyle = colorName: It is a property to set the color for the object. It could be a colorname, RGB or hex code for the object.</li> </ul> <p>Other methods are:</p> <ul> <li> strokeRect(x, y, width, height): This method to to make a outline stroke on the rectangle, this may be used independently or combined with fillStyle and fillRect(x, y, width, height).</li> <li> clearRect(x, y, width, height): to clear the rectangle by making it transparent.</li> </ul> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467309545713.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <hr> <h2> ? <strong>Drawing basics</strong> </h2> <p>Different shapes and lines can be drawn using some specific methods depending on the object.</p> <h4> 1. Path: </h4> <p>Examples are line, wavy line, zigzag e.t.c</p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467309649925.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p>For creating a line, the following method needs to be set up:</p> <ul> <li> beginPath(): This method is to start a new path for a drawing.</li> <li> moveTo(x, y): This is to move the drawing to the specified points.</li> <li> lineTo(x, y): This is to draw from the current position to the specified points.</li> <li> stroke(): This is to draw the line.</li> </ul> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467309776138.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <h4> 2. Rectangle and Square </h4> <ul> <li>Rectangle</li> </ul> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467309977240.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <ul> <li>Square </li> </ul> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467310125861.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p>These following methods are used in creating a rectangle or square:</p> <ul> <li> fillRect: this method is for create rectangle and square only.</li> <li> clearRect(x, y, width, height): this method is to clear rectangle hence making it transparent.</li> <li> strokeRect(x, y, width, height): is used to create an outline rectangle or square.</li> <li> fillStyle: this is used to fill the container of the rectangle or square.</li> <li> strokeStyle: this method is for add stroke color to an outline rectangle.</li> <li> roundRect(x, y, width, height, radii): this method is for creating round border rectangle.</li> </ul> <h4> 3. Circle </h4> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467310240234.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."><br> These following methods are used in creating a circle:</p> <ul> <li> beginPath(): this method to begin a path.</li> <li> arc(x, y, radius, startAngle, endAngle, anticlockwise): this is for to create circle where x and y is for center coordinate of the center, radius is the radius of the circle, startAngle and endAngle which is an angle for the circle.</li> </ul> <h4> 4. Polygon </h4> <p>To create a polygon, you need to determine the sides of the shape, it could be a triangle(3 sides), pentagon (5 sides), hexagon(6 sides) or decagon (10 sides).</p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467310482546.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p>These following methods are used in creating a circle:</p> <ul> <li> beginPath(): this method is to create a new shape.</li> <li> closePath(): this method is to end the shape.</li> <li> cx: its value for the center of x co-ordinates.</li> <li> cy: its value specifies the center for y co-ordinates.</li> <li> radius: radius of the shape.</li> </ul> <p>To get the angle, you have to calculate with this formula by dividing the circle into two;<br> </p> <pre class="brush:php;toolbar:false">angle = 2π/ n </pre> <p>其中 π 為 3.14； n 是邊數(shù)。您還必須減去 π/2 才能獲得形狀從上到下的位置。<br> <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467310570500.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467310736585.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <hr> <h2> ？ <strong>帶有 <canvas> 的文本</canvas></strong> </h2> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467310927100.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <p>要?jiǎng)?chuàng)建文本，使用以下方法：</p> <ul> <li> font：指定字體大小和字體系列。</li> <li> fillStyle：這是給文本添加顏色。</li> <li> fillText：繪制填充文本。</li> <li> 描邊文本：繪制輪廓文本</li> <li> createLinearGradient 或 createRadialGradient：為文本添加漸變</li> <li> textAlign: 設(shè)置文本水平</li> </ul> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/000/173467311025343.jpg" class="lazy" alt="HTML Canvas Made Simple: A Guide for Beginners."></p> <hr> <h2> <strong>結(jié)論</strong> </h2> <p>使用 HTML <canvas>可以幫助動(dòng)態(tài)繪制圖形。至此，您已經(jīng)學(xué)會了如何使用canvas進(jìn)行繪制，包括它的用途和重要性，這是稍后創(chuàng)建復(fù)雜圖形的基礎(chǔ)。</canvas></p> <h3> <strong>與我聯(lián)系</strong> </h3> <p>有關(guān) Web 開發(fā)的更多文章。在 Linkedin 和 X 上關(guān)注我<br> Linkedin X</p> <p>以上是HTML Canvas 變得簡單：初學(xué)者指南。的詳細(xì)內(nèi)容。更多信息請關(guān)注PHP中文網(wǎng)其他相關(guān)文章！</p> </div> </div> <div id="377j5v51b" class="wzconShengming_sp"> <div id="377j5v51b" class="bzsmdiv_sp">本站聲明</div> <div>本文內(nèi)容由網(wǎng)友自發(fā)貢獻(xiàn)，版權(quán)歸原作者所有，本站不承擔(dān)相應(yīng)法律責(zé)任。如您發(fā)現(xiàn)有涉嫌抄襲侵權(quán)的內(nèi)容，請聯(lián)系admin@php.cn</div> </div> </div> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-5902227090019525" data-ad-slot="2507867629"></ins> <div id="377j5v51b" class="AI_ToolDetails_main4sR"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3653428331" 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