konva實現(xiàn)類似行星公轉(zhuǎn)動畫

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<div id="box"></div>
<script src="bower_components/konva/konva.js"></script>
<script>

    var stage = new Konva.Stage({
        container:"box",
        width:window.innerWidth,
        height:window.innerHeight
    });

    var cx = 400;
    var cy = 400;
    var bigRadius = 240;
    var middleRadius = 160;
    var centerRadius = 80;

    var bgLayer = new Konva.Layer();
    stage.add(bgLayer);

    var bigCircle = new Konva.Circle({
        x:cx,
        y:cy,
        radius:bigRadius,
        stroke:"#ccc",
        dash:[10,2]
    });
    bgLayer.add(bigCircle);

    var middleCircle = new Konva.Circle({
        x:cx,
        y:cy,
        radius:middleRadius,
        stroke:"#ccc",
        dash:[10,2]
    });
    bgLayer.add(middleCircle);

    var centerCircle = new CircleText({
        x:cx,
        y:cy,
        innerRadius:centerRadius,
        outerRadius:centerRadius+30,
        innerFill:"#369",
        outerFill:"#ddd",
        text:"WEB前端",
        fontSize:18,
        fontWeight:"bold",
        fontFill:"#fff",
        fontX:-35,
        fontY:-9

    });
    bgLayer.add(centerCircle);

    
    bgLayer.draw();


    var layer = new Konva.Layer();
    stage.add(layer);

    var bigCircleData = [
        {
            innerRadius:40,
            outerRadius:50,
            innerFill:"#5cb85c",
            outerFill:"#ddd",
            text:"HTML5",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        },
        {
            innerRadius:40,
            outerRadius:50,
            innerFill:"#5bc0de",
            outerFill:"#ddd",
            text:"CSS3",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        },
        {
            innerRadius:40,
            outerRadius:50,
            innerFill:"#f0ad4e",
            outerFill:"#ddd",
            text:"ECMA6",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        },
        {
            innerRadius:40,
            outerRadius:50,
            innerFill:"#d9534f",
            outerFill:"#ddd",
            text:"jQuery",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        },
        {
            innerRadius:40,
            outerRadius:50,
            innerFill:"#428bca",
            outerFill:"#ddd",
            text:"NodeJS",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        }
    ];



    var bigCircleGroup = new Konva.Group({
        x:cx,
        y:cy
    });
    layer.add(bigCircleGroup); 


    var angle = 0;
    var angleDiff = 360 / bigCircleData.length;

    bigCircleData.forEach(function(option, index){
        
        option.x = Math.cos(angle / 180 * Math.PI) * bigRadius;
        option.y = Math.sin(angle / 180 * Math.PI) * bigRadius;
        var circleText = new CircleText(option);

        bigCircleGroup.add(circleText);

        angle += angleDiff;

    });


    var middleCircleData = [
        {
            innerRadius:30,
            outerRadius:40,
            innerFill:"purple",
            outerFill:"#ddd",
            text:"VueJS",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        },
        {
            innerRadius:30,
            outerRadius:40,
            innerFill:"pink",
            outerFill:"#ddd",
            text:"Angle",
            fontSize:14,
            fontX:-20,
            fontY:-7,
            opacity:.7
        }
    ]

    var middleCircleGroup = new Konva.Group({
        x:cx,
        y:cy
    });
    layer.add(middleCircleGroup);

    var angle1 = 0;
    var angleDiff1 = 360 / middleCircleData.length;

    middleCircleData.forEach(function(option, index){
        
        option.x = Math.cos(angle1 / 180 * Math.PI) * middleRadius;
        option.y = Math.sin(angle1 / 180 * Math.PI) * middleRadius;
        var circleText = new CircleText(option);

        middleCircleGroup.add(circleText);

        angle1 += angleDiff1;

    });




    layer.draw();

    var angleSpeed = 60;
    var animation = new Konva.Animation(function(frame){
        var angleDiff = angleSpeed * frame.timeDiff / 1000;

        bigCircleGroup.rotate(angleDiff);
        bigCircleGroup.getChildren().each(function(val, index){
            val.rotate(-angleDiff);
        }) 

        middleCircleGroup.rotate(-angleDiff);
        middleCircleGroup.getChildren().each(function(val, index){
            val.rotate(angleDiff);
        }) 

    }, layer);
    animation.start();

    bigCircleGroup.on("mouseenter", function(){
        angleSpeed = 10;
    }).on("mouseleave touchend", function(){
        angleSpeed = 60;
    })

    function CircleText(options) {
        options = options || {};
        options.x = options.x || 0;
        options.y = options.y || 0;
        options.innerRadius = options.innerRadius || 0;
        options.outerRadius = options.outerRadius || 0;
        options.innerFill = options.innerFill || "red";
        options.outerFill = options.outerFill || "#ddd";
        options.text = options.text || "小萍萍";
        options.fontFill = options.fontFill || "#fff";
        options.fontSize = options.fontSize || 16;
        options.fontWeight = options.fontWeight || "normal";
        options.fontFamily = options.fontFamily || "MicrosoftYaHei";
        options.fontX = options.fontX || 0;
        options.fontY = options.fontY || 0;
        options.opacity = options.opacity || 1;

        var group = new Konva.Group({
            x:options.x,
            y:options.y
        })

        var circle = new Konva.Circle({
            x:0,
            y:0,
            radius:options.innerRadius,
            fill:options.innerFill
        });
        group.add(circle);

        var ring = new Konva.Ring({
            x:0,
            y:0,
            innerRadius:options.innerRadius,
            outerRadius:options.outerRadius,
            fill:options.outerFill
        });
        group.add(ring);

        var text = new Konva.Text({
            x:options.fontX,
            y:options.fontY,
            text:options.text,
            fill:options.fontFill,
            fontSize:options.fontSize,
            fontFamily:options.fontFamily,
            fontWeight:options.fontWeight
        });
        group.add(text);
        
        return group;
    }

</script>
</body>
</html>
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