JS+canvas做出围绕旋转动画_动视

JS+canvas做出围绕旋转动画

2020-11-27 19:54:56 责编:小采

这次给大家带来JS+canvas做出围绕旋转动画，JS+canvas做出围绕旋转动画的注意事项有哪些，下面就是实战案例，一起来看一下。

使用canvas的convas来实现围绕旋转动画，外圈顺时针，里层逆时针

html文件

<!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文件

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); 
 } 
}

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