根据其他图像的位置旋转图像90度 - Rotate image by 90 degree depending on the position of other image

Rotate image by 90 degree depending on the position of other image

本文关键字：图像旋转 90度位置其他 | 更新日期: 2023-09-27

我正在尝试创建一个水平视差网站。我有一个id为#ellipse的图像，从右到左在不同位置滑动，例如-

item.screenPos=["320%","220%","120%","34%","-80%","-180%","-280%","-380%"];

当此图像到达34%位置时，它在屏幕上可见。

我想要另一个id为#strip的图像(不滑动并且固定在屏幕的中心)，当上面的图像(id为#ellipse)达到位置34%时，旋转90度。

目前我正在使用这个-

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script>   
$(document).ready(function(){
  $("#ellipse").position("34%")(function(){
    $("#strip").rotate({angle:90});
  });
}); 
</script>

有谁能帮帮我吗?我是开放使用javascript, jquery, css &php .

你需要使用视差库，或者定义视差动画推进时触发的事件。例如，假设你的视差动画将由滚动位置控制:

// catch the event that triggers the animation
// this could be a mouse position, a accelerometer angle, etc
$(window).scroll(function(){
    var currentScrollPosition = $(document).scrollTop(),
    // lets say your scroll animation should happen in the first 
    // 300px of scroll, therefore 0px = first frame of anim
    // 300px = last frame of anim
        animationPercentage = currentScrollPosition/300; // 0 to 1
    // only animate if in range
    if (animationPercentage <= 1){
        // now you can control stuff based on the percentage of the animation
        //                position = start pos + delta * %
        $('#ellipse').css('left', (-380 +  (320 + 380) * animationPercentage );
        // rotate as a function of animationPercentage
        // let's say that #ellipse is visible at 50% of the animation
        if (animationPercentage >= 0.5){
            $('#strip').css('-webkit-transform', 'rotate(90deg)');  // or
            $('#strip').addClass('rotate');
        }
    }
});

现在，如果位置与动画事件不成比例，你可以这样做:

item.screenPos={
    "0.9":"320%", // position at 90% of animation
    "0.85":"220%", // position at 85% of animation
    "0.71":"120%", //... you get the point
    "0.5":"34%",
    "0.48":"-80%",
    "0.2":"-180%",
    "0.15":"-280%",
    "0":"-380%"
};

并将animationPercentage与每个值的键匹配。但我相信你可以自己试一试。