Javascript HTML5 Canvas implements Lab bicycle animation effect

Home

Web Front-end

JS Tutorial

Javascript HTML5 Canvas implements Lab bicycle animation effect_javascript skills

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

May 16, 2016 pm 03:46 PM

canvashtml5javascript

The example in this article describes the implementation of Lab bicycle animation effect using Canvas of javascript HTML5. Share it with everyone for your reference. The details are as follows:

Here is a bicycle animation implemented using HTML5. You will understand the effect after running it. However, do not test it under IE8, as it will have no effect. Please test under a browser that supports the latest HTML3 and CSS3, and I wish you good luck.

The screenshot of the running effect is as follows:

The specific code is as follows:

<html>
<head>
<title>Canvas Lab单车动画，HTML5动画</title>
</head>
 <script type="text/javascript">
  var framecounter = 800;//为了完成作业，无耻了点，在这里设置变量……
  var direction = "left";
  function drawBikeBody () {
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.lineWidth = 3;
   context.beginPath();
   context.moveTo(0,0);
   context.lineTo(150,0);
   context.lineTo(100,100);
   context.closePath();
   context.moveTo(100,100);
   context.lineTo(200,75);//后轮轴承点
   context.lineTo(150,0);
   //下面那个一个脚踏
   context.moveTo(100,100);
   context.lineTo(110,120);
   context.lineTo(120,120);
   context.moveTo(110,120);
   context.lineTo(100,120);
   //另一个脚踏
   context.moveTo(100,100);
   context.lineTo(90,80);
   context.lineTo(100,80);
   context.moveTo(90,80);
   context.lineTo(80,80);
   //座包
   context.moveTo(150,0);
   context.lineTo(160,-20);
   context.lineTo(175,-20);
   context.moveTo(160,-20);
   context.lineTo(135,-20);
   //扶手
   context.moveTo(0,0);
   context.lineTo(15,-30);
   context.lineTo(10,-35);
   context.lineTo(20,-40);
   context.lineTo(40,-40);
   //前轮轴承
   context.moveTo(0,0);
   context.lineTo(-35.5,75);//前轮轴承点
   //前轮
   context.moveTo(75-35.5,75);//去掉这个目测不行啊，貌似context.arc()方法里有lineTo
   context.arc(-35.5,75,75,0,Math.PI*2,true);
   //后轮
   context.moveTo(200+75,75);
   context.arc(200,75,75,0,Math.PI*2,true);
  }
  function drawForcePiece1(){
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.beginPath();
   for(var i = framecounter; i < framecounter+360; i += 20) { 
    context.moveTo(-35.5,75);
    x = Math.cos(Math.PI / 180 * i) * 75 + (-35.5); 
    y = Math.sin(Math.PI / 180 * i) * 75 + 75; 
    context.lineTo(x,y);
    }
  }
  function drawForcePiece2(){
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.beginPath();
   for(var i = framecounter; i < framecounter+360; i += 20) { 
    context.moveTo(200,75);
    x = Math.cos(Math.PI / 180 * i) * 75 + 200; 
    y = Math.sin(Math.PI / 180 * i) * 75 + 75; 
    context.lineTo(x,y);
    }
  }
  function drawBike(){
   var canvas = document.getElementById('diagonal');
   var context = canvas.getContext('2d');
   context.clearRect(0, 0, 800, 600);
   context.save();
   context.translate(framecounter,300);
   drawBikeBody();
   context.stroke();
   context.restore();
   context.save();
   context.translate(framecounter,300);
   drawForcePiece1();
   context.stroke();
   context.restore();
   context.save();
   context.translate(framecounter,300);
   drawForcePiece2();
   context.stroke();
   context.restore();
   if (direction==="left") {
    framecounter--;
   }else{
    framecounter++;
   }
  }
  function move() {
   var interal = setInterval(function () {
  drawBike();
  }, 10);
  }  
  window.addEventListener("load",move,true);
 </script>
 <body>
  <canvas id="diagonal" width="800" height="600" style="border:1px dashed">Please update your brower to the newest version!</canvas>
  <br>
  <button id="reset" onclick="framecounter=800;">Reset</button>
  <button id="left" onclick="direction='left'">Go Left</button>
  <button id="right" onclick="direction='ture'">Go Right</button>
 </body>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AM

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AM

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AM

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AM

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AM

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AM

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.

Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AM

I built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing

How to Build a Multi-Tenant SaaS Application with Next.js (Frontend Integration)Apr 11, 2025 am 08:22 AM

This article demonstrates frontend integration with a backend secured by Permit, building a functional EdTech SaaS application using Next.js. The frontend fetches user permissions to control UI visibility and ensures API requests adhere to role-base

See all articles

Hot AI Tools

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress images for free

Clothoff.io

AI clothes remover

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Best Graphic Settings

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Seashell Riddle Solution

2 weeks agoByDDD

R.E.P.O. How to Fix Audio if You Can't Hear Anyone

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Chat Commands and How to Use Them

1 months agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 English version

Recommended: Win version, supports code prompts!

SecLists

SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.