Home > Developer > Web Develop

[JS Master's road] HTML5 Canvas Animation tutorial-Uniform motion

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Uniform motion: Refers to the movement of an object in a straight line, and the displacement of an object through any equal time interval is equal. In fact, it is uniform motion, it is characterized by an acceleration of 0, from the definition, in any equal time interval, the speed and direction are the same.

12<meta charset= ' Utf-8 '/>3<style>4 #canvas {5 border:1px dashed #aaa;6         }7</style>8<script>9Window.onload =function () {Ten             varOcanvas = Document.queryselector ("#canvas"), OneOGc = Ocanvas.getcontext (' 2d '), Awidth = ocanvas.width, height =Ocanvas.height, -x = 0; -             functiondrawball (x, y, cxt) { theCxt.fillstyle = ' #09f '; - Cxt.beginpath (); -Cxt.arc (x, y, 20, 0, 2 *Math.PI); - Cxt.closepath (); + Cxt.fill (); -             } +(functionlinear () { AOgc.clearrect (0, 0, width, height); atDrawball (x, HEIGHT/2, oGc); -X + = 2; - Console.log (x); - requestanimationframe (linear); -             } )(); -         } in</script> - to<body> +<canvas id= "Canvas" width= "height=" ></canvas> -</body>

The above example lets a small ball with a radius of 20px from x=0, y=canvas the height of half, at 2px per frame speed to the right uniform motion.

We can encapsulate the ball into an object:

Ball.js file:

1 functionBall (x, y, R, color) {2      This. x = x | | 0;3      This. y = y | | 0;4      This. Radius = R | | 20;5      This. color = Color | | ' #09f ';6 }7Ball.prototype = {8 Constructor:ball,9Stroke:function(CXT) {TenCxt.strokestyle = This. Color; One Cxt.beginpath (); ACxt.arc ( This. x, This. Y, This. Radius, 0, 2 *Math.PI); - Cxt.closepath (); - Cxt.stroke (); the     }, -Fill:function(CXT) { -Cxt.fillstyle = This. Color; - Cxt.beginpath (); +Cxt.arc ( This. x, This. Y, This. Radius, 0, 2 *Math.PI); - Cxt.closepath (); + Cxt.fill (); A     } at}

The ball object, can be customized position radius and color, support two rendering methods (stroke and fill)

12<meta charset= ' Utf-8 '/>3<style>4 #canvas {5 border:1px dashed #aaa;6         }7</style>8<script src= "./ball.js" ></script>9<script>TenWindow.onload =function () { One             varOcanvas = Document.queryselector ("#canvas"), AOGc = Ocanvas.getcontext (' 2d '), -width = ocanvas.width, height =Ocanvas.height, -Ball =NewBall (0, HEIGHT/2 ); the(functionlinear () { -Ogc.clearrect (0, 0, width, height); - Ball.fill (oGc); -Ball.x + = 2; + requestanimationframe (linear); -             })(); +         } A</script> at -  -<body> -<canvas id= "Canvas" width= "height=" ></canvas> -</body>

Slash Uniform motion:

12<meta charset= ' Utf-8 '/>3<style>4 #canvas {5 border:1px dashed #aaa;6         }7</style>8<script src= "./ball.js" ></script>9<script>TenWindow.onload =function () { One             varOcanvas = Document.queryselector ("#canvas"), AOGc = Ocanvas.getcontext (' 2d '), -width = ocanvas.width, height =Ocanvas.height, -Ball =NewBall (0, height); the(functionlinear () { -Ogc.clearrect (0, 0, width, height); - Ball.fill (oGc); -Ball.x + = 2; +BALL.Y-= 1; - requestanimationframe (linear); +             })(); A         } at</script> - -  -<body> -<canvas id= "Canvas" width= "height=" ></canvas> -</body>

[JS Master's road] HTML5 Canvas Animation tutorial-Uniform motion

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
html5 canvas image animation animation in html5 canvas examples html5 canvas 3d tutorial html5 canvas chart tutorial html5 canvas clock html5 canvas map example html5 canvas examples

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More