Home > Web Front-end > H5 Tutorial > Canvas study notes in html5 1-The size of the drawing board and the actual display size_html5 tutorial skills

Canvas study notes in html5 1-The size of the drawing board and the actual display size_html5 tutorial skills

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Release: 2016-05-16 15:50:33
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In canvas, when writing width and height on canvas, it is the actual artboard size of canvas. By default, width is 300px and height is 150px.
When writing css style in style, widht and height are the actual display size.
Now use canvas to draw a diagonal line as an example:

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canvas</title> ; <br /><script type='text/javascript'> <br>window.onload = function(){ <br>getCanvas(); <br>}; <br>//canvase drawing<br>function getCanvas(){ <br>//Get the canvas element and its drawing context <br>var canvas = document.getElementById('canvasId'); <br>var context = canvas.getContext('2d'); <br>/ /Use absolute landmarks to create a path <br>context.beginPath(); <br>context.moveTo(0,200); <br>context.lineTo(200,0); <br>//Draw this first to On canvas <br>context.stroke(); <br>} <br></script> <br></head> <br><body> <br><canvas id='canvasId' width ="200px" height='200px' style='width:400px;height:200px;' ></canvas> <br></body> <br></html> <br> </div> <br>The display effect is as follows: <br><img src="http://files.jb51.net/file_images/article/201301/201316172320955.png" alt=""> <br>As you can see, the canvas drawing board is a square of 200*200, and the drawing uses the diagonal display from (0, 200) to (200, 0). <br>But the graph is displayed as a 400*200 rectangle, and it also displays diagonals. </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>Related labels:</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/search?word=canvas" target="_blank">canvas</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">source:php.cn</div> </div> <div class="wzconOtherwz"> <a href="https://www.php.cn/faq/6515.html" title="Implementation of new tags using HTML5 in old browsers such as IE6 series_html5 tutorial tips"> <span>Previous article:Implementation of new tags using HTML5 in old browsers such as IE6 series_html5 tutorial tips</span> </a> <a href="https://www.php.cn/faq/6519.html" title="Introduction to the new array TypedArray introduced in HTML5_html5 tutorial skills"> <span>Next article:Introduction to the new array TypedArray introduced in HTML5_html5 tutorial skills</span> </a> </div> <div class="wzconShengming"> <div class="bzsmdiv">Statement of this Website</div> <div>The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. 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