[英]KineticJS HTML5 Canvas Harmonic Oscillator
var anim = new Kinetic.Animation(function(frame) {
var scale = Math.abs(0.5 * (Math.sin(2* Math.PI * frame.time / 3000) + 1.5));
weight.setY(200 * scale + 40);
spline.scale({y:scale});
}, layer);
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