javascript - 流畅的 KineticJS 动画，控制速度

Question

为了好玩，我正在使用 KineticJS 创建一个简单的平面动画。

目前动画运行有点不稳定我很想有一些缓动或补间虽然我不知道如何开始。

谁能帮我算算？

<div id="container"></div>

<script src="http://www.html5canvastutorials.com/libraries/kinetic-v4.5.0-beta.js"></script>

<script defer="defer">
  var stage = new Kinetic.Stage({
    container: 'container',
    width: 870,
    height: 392
  });

  var layer = new Kinetic.Layer();

  var xPos = 0;
  var yPos = 126;
  var growthFactorX = 6;
  var growthFactorY = 2.6; 
  var growthFactorP = 3; 
  var planeRotation = 30;     

  // dashed line
  var trail = new Kinetic.Line({
    points: [{x: xPos,y: yPos}],
    stroke: 'white',
    strokeWidth: 2,
    lineJoin: 'round',
    dashArray: [6, 5]
  });

  var imageObj = new Image();
  imageObj.src = '/assets/img/plane.png'; 
  var plane = new Kinetic.Image({
    x: xPos,
    y: yPos - 15,
    width: 54,
    height: 30
  }); 
  imageObj.onload = function() {

    plane.setImage(imageObj);
    layer.add(plane);
    stage.add(layer);
  };
  plane.rotateDeg( planeRotation );


  layer.add(trail);
  stage.add(layer);

  var anim = new Kinetic.Animation(function(frame) {


        if( xPos < 500 ) {

            xPos = growthFactorX + xPos; // adds 3 to xPos on each loop

            if( xPos > 400 ) {

                yPos = yPos - growthFactorY;

                if( plane.getRotationDeg() > 0 )
                    plane.rotateDeg( (-growthFactorP) ) ;
            }

            var curPoints = trail.getPoints();
            var newPoints = [{x: xPos, y: yPos}];

            trail.setPoints(curPoints.concat(newPoints));
            plane.setX(xPos + 10);
            plane.setY(yPos - 35);
        }
        else {

            anim.stop();
        }
  }, layer);

  anim.start();      
</script>

Answer 1

我已经为你制作了一个 fiddle ，

并且改变了这些因素，我觉得它看起来很顺利，如果有任何规范请告诉我

  var xPos = 0;
  var yPos = 126;
  var growthFactorX = 5;
  var growthFactorY = 2; 
  var growthFactorP = 1; 
  var planeRotation = 30;    

fiddle link

我希望这会成功:)