我在ScrollMagic库的帮助下，根据滚动位置更改了three-section-container部分的背景img。此外，我设法添加了一个覆盖，只有当我在页面的某个部分时才会出现。
我现在的问题是，我想制作背景图像如何变化的动画(我想从右到左，并保持在中间/正如你在代码中看到的那样，背景变化了2次(。我试过使用`transform:translateY(40px(；属性，但结果不一致，因为图像不会是我屏幕的100%。此外，我希望我的覆盖从左到右，我很困惑如何覆盖。
HTML
<div id="bigSection" class="three-section-container ">
<div id="target-overlay" class=" "></div>
<div class="sec1 " id="project01"></div>
<div class="sec2 " id="project02"></div>
<div class="sec3" id="project03"></div>
</div>
CSS
.three-section-container{
position: relative;
background-color: black;
transition: all 3s ease;
background-image: url('../../Assets/Images/graphic/last/poza-augmented-reality.png');
background-repeat: no-repeat;
background-color: black;
background-size: 100% 100vh;
background-attachment: fixed;
}
.fade-img1{
transition: all 1s ease;
background-image: url('../../Assets/Images/graphic/last/poza-augmented-reality.png');
background-repeat: no-repeat;
background-color: black;
background-size: 100% 100vh;
background-attachment: fixed;
// transform: translatey(20px);
opacity: 1;
margin: 0;
z-index: 999;
}
.fade-img2{
background-image: url('../../Assets/Images/graphic/last/2.png');
background-repeat: no-repeat;
background-color: black;
background-size: 100% 100vh;
background-attachment: fixed;
opacity: 1;
transition: all 1s ease;
margin: 0;
z-index: 999;
}
.fade-img3{
background-image: url('../../Assets/Images/graphic/last/poza-interior.png');
background-repeat: no-repeat;
background-color: black;
background-size: 100% 100vh;
background-attachment: fixed;
// transform: translateY(40px);
opacity: 1;
transition: all 0.3s ease;
margin: 0;
z-index: 999;
}
.sec1, .sec2, .sec3{
height: 100vh;
}
.overlay {
transition: 0.3s linear all;
position: absolute; /* Sit on top of the page content */
width: 40%; /* Full width (cover the whole page) */
height: 100%; /* Full height (cover the whole page) */
top: 0;
left: 0;
right: 0;
background-color: rgba(0, 0, 0, 0.5); /* Black background with opacity */
z-index: 999; /* Specify a stack order in case you're using a different order for other elements */
}
JS
$(document).ready(function(){
var controller=new ScrollMagic.Controller()
// build a scene
var ourScene= new ScrollMagic.Scene({
triggerElement:'#project01',
duration:"100%"
})
.setClassToggle('#bigSection', 'fade-img1')
.addIndicators({
name:'fade scene',
colorTRigger:'black',
indent:200,
colorStart:'#75c695'
})
.addTo(controller)
var ourScene= new ScrollMagic.Scene({
triggerElement:'#project02',
duration:"100%"
})
.setClassToggle('#bigSection', 'fade-img2')
.addIndicators({
name:'fade scene',
colorTRigger:'black',
indent:200,
colorStart:'#75c695'
})
.addTo(controller)
var ourScene= new ScrollMagic.Scene({
triggerElement:'#project03',
duration:"200%"
})
.setClassToggle('#bigSection', 'fade-img3')
.addIndicators({
name:'fade scene',
colorTRigger:'black',
indent:200,
colorStart:'#75c695'
})
.addTo(controller)
var ourScene= new ScrollMagic.Scene({
triggerElement:'#project01',
// duration:"200%"
})
.setClassToggle('#target-overlay', 'overlay')
.addIndicators({
name:'overlay',
colorTRigger:'black',
indent:200,
colorStart:'#75c695'
})
.addTo(controller)
})
欢迎任何帮助。谢谢
我不熟悉ScrollMagic API，但我认为这个代码片段可以让动画中涉及的JS和CSS前景变得清晰一些。
事实上，它们中的大多数都可以在不需要外部API的情况下完成，只需要触发一个CSS类！
希望这能对你有所帮助：
let animationDone = false;
window.addEventListener("scroll", () => {
/*
* IF you scrolled more than a certain amount:
* in this case i choose half a page height's (50vh),
* you trigger the slide animation by adding the onscreen class to the background2 div.
* Otherwise if you previously triggered the animation and
* you scrolled in the opposite direction: the animation is triggered backwards.
*/
if(window.scrollY > window.innerHeight / 2) {
document.getElementsByClassName("background2")[0].classList.add("onscreen");
document.getElementById("secondPage").classList.add("onscreen");
animationDone = true; //We makes sure that we always know the state of our animation
} else if(animationDone) {
document.getElementsByClassName("background2")[0].classList.remove("onscreen");
document.getElementById("secondPage").classList.remove("onscreen");
animationDone = false; //We makes sure that we always know the state of our animation
}
}, {passive:true});body {
color:white;
margin: 0;
width:100vw;
height:200vh; /* 200vh is only for demo purposes: it allows to scroll the html body even thought there's nothing inside */
}
#mainContent {
text-align: center;
z-index: 99;
position: absolute;
}
#mainContent > * {
display: flex;
justify-content: center;
align-items: center;
}
#firstPage {
width: 100vw;
height: 100vh;
}
#secondPage {
width: 100vw;
height: 100vh;
opacity: 0; /* This makes our background2 div transparent as soon as its hidden */
transform: translateX(-100vw); /* This shifts our background to the left by 100vw (its width) */
transition: 1s; /* The page content animation's duration */
}
#secondPage.onscreen {
/*
* This cancels the second page's previous shift (to left) when the onscreen class is applied to secondPage div
* in 0.3s so that it won't snap-> the left to right transition is realized !
*/
transform: translateY(0);
opacity: 1; /* This makes our background2 fades from transparent (its original state) to opaque */
}
.background1 {
z-index: 1; /* Lower stacking index than the other background to hide it */
position: fixed;
width: 100vw;
height: 100vh;
background: red;
}
.background2 {
z-index: 2; /* Higher stacking index than the other background to show it*/
position: fixed;
width: 100vw;
height: 100vh;
background: blue;
opacity: 0; /* This makes our background2 div transparent as soon as its hidden */
transform: translateX(100vw); /* This shifts our background to the right by 100vw (its width) */
transition: 0.3s; /* The background2 animation's duration */
}
.background2.onscreen {
/*
* This cancels the background's previous shift when the onscreen class is applied to background2
* in 0.3s so that it won't snap-> the right to left transition is realized !
*/
transform: translateY(0);
opacity: 1; /* This makes our background2 fades from transparent (its original state) to opaque */
}<body>
<div id = "mainContent">
<h1 id = "firstPage">The main content goes here</h1>
<h1 id = "secondPage">Animation Triggered !</h1>
</div>
<div class = "background1"></div>
<div class = "background2"></div>
</div>
</body>