我正在尝试使用ScrollMagic来控制用于移动Lottie动画的播放头的TimelineMax。
因此,当用户滚动时,动画相对于滚动的速度和方向播放。我离得太近了,需要一点帮助才能使效果恢复正常。
首先,我包括我的图书馆
<script src="https://cdnjs.cloudflare.com/ajax/libs/bodymovin/5.5.9/lottie.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/2.1.3/TweenMax.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/ScrollMagic.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/plugins/animation.gsap.js"></script>
然后...
// init scrollmagic
var controller = new ScrollMagic.Controller();
现在,动画设置...
// Manage Animation
var animation = bodymovin.loadAnimation({
container: document.getElementById('lottie'), // Required
path: '/static/animations/animation.json', // Required
renderer: 'svg', // Required
loop: false, // Optional
autoplay: false, // Optional
name: "Welcome to Awesomeness", // Name for future reference. Optional.
});
这是我在努力的地方:
// Setup Timeline
var lottieControl = new TimelineMax({ repeat: -1, yoyo: true }); // <-- don't loop and let the timeline go back and forth
lottieControl.to({ frame:0 }, 1, { // <-- is this right? I'm telling the timeline to start at frame 0
onUpdate:function(){
animation.goToAndStop(Math.round(this.target.frame), true) // <-- move the playback head of the animation to the target frame that has been rounded and use frames not time (true)
},
ease:Linear.easeNone
})
最后,将它们重新组合在一起...
// Attach to scroll
var lottieScene = new ScrollMagic.Scene({
duration: '80%',
offset: 1
})
.setPin("#header-scroll")
.setTween(lottieControl)
.addTo(controller);
为了我的一生,我无法确定我是否正在正确地使用goToAndStop
方法。谢谢您的时间。
经过数小时的测试,我找到了答案。我在看错东西。我需要将时间表进度与框架联系起来。在这种情况下,有300帧,因此乘以动画中的帧数。
这里是修改后的代码:
<script src="https://cdnjs.cloudflare.com/ajax/libs/bodymovin/5.5.9/lottie.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/2.1.3/TweenMax.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/ScrollMagic.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/ScrollMagic/2.0.7/plugins/animation.gsap.js"></script>
<script>
// init scrollmagic
var controller = new ScrollMagic.Controller();
// Manage Animation
var animation = bodymovin.loadAnimation({
container: document.getElementById('lottie'), // Required
path: '/static/animations/scroll_animation.json', // Required
renderer: 'svg', // Required
loop: false, // Optional
autoplay: false, // Optional
name: "Welcome to Awesomeness",
});
// Setup Timeline
var tl = new TimelineMax();
tl.to({frame:0}, 1, {
frame: animation.totalFrames-1,
onUpdate:function(){
animation.goToAndStop((Math.round(this.progress() * 300)), true)
},
ease: Linear.easeNone
})
// Attach to scroll
var lottieScene = new ScrollMagic.Scene({
duration: '100%',
offset: 1
})
.setPin("#header-scroll")
.setTween(tl)
.addTo(controller);
</script>