Home > Article > Web Front-end > JavaScript canvas implements rotation animation

JavaScript canvas implements rotation animation

小云云Original: 2018-01-18 11:28:372146browse

This article mainly introduces JavaScript canvas to realize rotation animation in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

Use the canvas of canvas to realize the rotation animation, the outer circle is clockwise, and the inner layer is counterclockwise

Code demo link address:Code demo link address

html file

<!DOCTYPE html> 
<html> 
<head lang="en"> 
 <meta charset="UTF-8"> 
 <title></title> 
 <style> 
  body { 
   margin: 0; 
   padding: 0; 
   overflow: hidden; 
   background-color: #f0f0f0; 
  } 
 </style> 
 <script src="js/konva.js"></script> 
 <script src="js/circle.js"></script> 
</head> 
<body> 
<p id="cas"></p> 
 
<script> 
 var width = window.innerWidth; 
 var height = window.innerHeight; 
 //创建舞台 
 var stage = new Konva.Stage({ 
  container: "cas", 
  width: width, 
  height: height 
 }); 
 //创建层 
 var layer = new Konva.Layer(); 
 //创建组1 
 var group = new Konva.Group({ 
  x: stage.width() / 2, 
  y: stage.height() / 2, 
 }); 
 //最外层圆 
 var circle1 = new Konva.Circle({ 
  x: 0, 
  y: 0, 
  radius: 250, 
  stroke: "#ccc", 
  strokeWidth: 1, 
  dash: [6, 3] 
 }); 
 group.add(circle1); 
 //第二个圆 
 var circle2 = new Konva.Circle({ 
  x: 0, 
  y: 0, 
  radius: 150, 
  stroke: "#ccc", 
  strokeWidth: 1, 
  dash: [6, 3] 
 }); 
 group.add(circle2); 
 //第三个圆 
 var circle3 = new Konva.Circle({ 
  x: 0, 
  y: 0, 
  radius: 135, 
  stroke: "blue", 
  strokeWidth: 2, 
  dash: [10, 5] 
 }); 
 group.add(circle3); 
 //第四个圆 
 var circle4 = new Konva.Circle({ 
  x: 0, 
  y: 0, 
  radius: 105, 
  fill: "#ccc", 
  opacity: 0.4 
 }); 
 group.add(circle4); 
 //第五个圆 
 var circle5 = new Konva.Circle({ 
  x: 0, 
  y: 0, 
  radius: 80, 
  fill: "#74A2F0" 
 
 }); 
 group.add(circle5); 
 //添加文字 
 var text = new Konva.Text({ 
  x: -80, 
  y: -12, 
  text: "WEB全栈", 
  fill: "white", 
  fontSize: 24, 
  width: 160, 
  align: "center" 
 }); 
 group.add(text); 
 layer.add(group); 
 //***************************************************** 
 //创建组2 
 var outGroup = new Konva.Group({ 
  x: stage.width() / 2, 
  y: stage.height() / 2, 
 }); 
 var arrColor = ["red", "green", "blue", "orange", "purple"]; 
 var arrText = ["web", "node.js", "ajax", "html5", "css"]; 
 for(var i = 0; i < 5; i++) { 
  var cir = new Circle({ 
   x : 250 * Math.cos(72 * i * Math.PI / 180), //圆心x轴的坐标 
   y : 250 * Math.sin(72 * i * Math.PI / 180), //圆心y轴的坐标 
   outR : 60, //外圆的半径 
   inR : 50, //内圆的半径 
   fill : arrColor[i], //填充颜色 
   text: arrText[i], //文字 
   outOpacity : 0.3, //外圆的透明度 
   inOpacity : 0.6  //内圆的透明度 
  }); 
  cir.drawCircle(outGroup); 
 } 
 layer.add(outGroup); 
 
 //*********************************************** 
 //创建组3 
 var inGroup = new Konva.Group({ 
  x: stage.width() / 2, 
  y: stage.height() / 2, 
 }); 
 var arrColor = ["red", "green", "blue", "orange", "purple"]; 
 var arrText = ["web", "node.js", "ajax", "html5", "css"]; 
 for(var i = 0; i < 5; i++) { 
  var cir = new Circle({ 
   x : 135 * Math.cos(90 * i * Math.PI / 180), //圆心x轴的坐标 
   y : 135 * Math.sin(90 * i * Math.PI / 180), //圆心y轴的坐标 
   outR : 45, //外圆的半径 
   inR : 35, //内圆的半径 
   fill : arrColor[i], //填充颜色 
   text: arrText[i], //文字 
   outOpacity : 0.3, //外圆的透明度 
   inOpacity : 0.6  //内圆的透明度 
  }); 
  cir.drawCircle(inGroup); 
 } 
 layer.add(inGroup); 
 
 //************************************************ 
 //运动动画 
 var step = 1; //转动的角度 
 var anim = new Konva.Animation(function() { 
  outGroup.rotate(step); 
  outGroup.getChildren().each(function (ele, index) { 
   ele.rotate(-step); 
  }); 
  inGroup.rotate(-step); 
  inGroup.getChildren().each(function (ele, index) { 
    ele.rotate(step); 
  }); 
 }, layer); 
 anim.start(); 
 stage.add(layer); 
 
 stage.on("mouseover", function () { 
  step = 0.3; 
 }); 
 stage.on("mouseout", function () { 
  step = 1; 
 }); 
</script> 
</body> 
</html>

js file

function Circle(obj) { 
 this._init(obj); 
} 
Circle.prototype = { 
 _init: function (obj) { 
  this.x = obj.x, //圆心x轴的坐标 
  this.y = obj.y, //圆心y轴的坐标 
  this.outR = obj.outR, //外圆的半径 
  this.inR = obj.inR, //内圆的半径 
  this.color = obj.fill, //填充颜色 
  this.text = obj.text, //内圆的文字 
  this.outOpacity = obj.outOpacity, //外圆的透明度 
  this.inOpacity = obj.inOpacity  //内圆的透明度 
 }, 
 drawCircle: function (group) { 
  //创建一个组 
  var groupCir = new Konva.Group({ 
   x: this.x, 
   y: this.y 
  }); 
  //外圆 
  var outCir = new Konva.Circle({ 
   x: 0, 
   y: 0, 
   radius: this.outR, 
   fill: this.color, 
   opacity: this.outOpacity 
  }); 
  groupCir.add(outCir); 
  //内圆 
  var inCir = new Konva.Circle({ 
   x: 0, 
   y: 0, 
   radius: this.inR, 
   fill: this.color, 
   opacity: this.inOpacity 
  }); 
  groupCir.add(inCir); 
  //添加文字 
  var text = new Konva.Text({ 
   x: -this.inR, 
   y: -10, 
   text: this.text, 
   fill: "white", 
   fontSize: 20, 
   width: 2 * this.inR, 
   align: "center" 
  }); 
  groupCir.add(text); 
 
  group.add(groupCir); 
 } 
}

Effect picture:

Related recommendations:

Pure css3 to realize 3D picture cube rotation animation special effects

HTML5/CSS3 3D cube rotation animation classic Case

Detailed explanation of a simple implementation example of css rotation animation effect

The above is the detailed content of JavaScript canvas implements rotation animation. For more information, please follow other related articles on the PHP Chinese website!

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

Previous article：Emergence.js js plugin to detect element visibilityNext article：Emergence.js js plugin to detect element visibility

See more

JavaScript canvas implements rotation animation

Related articles