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我在 codepen 上找到了这件作品,它是一个气泡以随机速度向上漂浮的动画,给人一种逼真的感觉,就好像它在啤酒或苏打水杯中一样。

基本上我想用它作为我正在从事的项目的背景。不过,我需要加快它们的速度,但不要让它们中的一些移动得非常快,而另一些移动相对较慢。

该脚本使用 math.random 来生成速度,因为显然所有这些都需要不同的速度才能获得逼真的效果,但我不能让它们以合适的速度相互协作。这是代码:

var $bubbles = $('.bubbles');

function bubbles() {

// Settings
var min_bubble_count = 20, // Minimum number of bubbles
  max_bubble_count = 40, // Maximum number of bubbles
  min_bubble_size = 3, // Smallest possible bubble diameter (px)
  max_bubble_size = 8; // Largest possible bubble diameter (px)

// Calculate a random number of bubbles based on our min/max
var bubbleCount = min_bubble_count + Math.floor(Math.random() * (max_bubble_count + 1));

// Create the bubbles
for (var i = 0; i < bubbleCount; i++) {
$bubbles.append('<div class="bubble-container"><div class="bubble"></div></div>');
}

// Now randomise the various bubble elements
$bubbles.find('.bubble-container').each(function(){

// Randomise the bubble positions (0 - 100%)
var pos_rand = Math.floor(Math.random() * 101);

// Randomise their size
var size_rand = min_bubble_size + Math.floor(Math.random() * (max_bubble_size + 1));

// Randomise the time they start rising (0-15s)
var delay_rand = Math.floor(Math.random() * 15);

// Randomise their speed (3-8s)
var speed_rand = 3 + Math.floor(Math.random() * 3);

// Cache the this selector
var $this = $(this);

// Apply the new styles
$this.css({
  'left' : pos_rand + '%',

  '-webkit-animation-duration' : speed_rand + 's',
  '-moz-animation-duration' : speed_rand + 's',
  '-ms-animation-duration' : speed_rand + 's',
  'animation-duration' : speed_rand + 's',

  '-webkit-animation-delay' : delay_rand + 's',
  '-moz-animation-delay' : delay_rand + 's',
  '-ms-animation-delay' : delay_rand + 's',
  'animation-delay' : delay_rand + 's'
});

$this.children('.bubble').css({
  'width' : size_rand + 'px',
  'height' : size_rand + 'px'
});

});
}

// In case users value their laptop battery life
// Allow them to turn the bubbles off
$('.bubble-toggle').click(function(){
if($bubbles.is(':empty')) {
bubbles();
$bubbles.show();
$(this).text('Bubbles Off');
} else {
$bubbles.fadeOut(function(){
  $(this).empty();
});
$(this).text('Bubbles On');
}

return false;
});

bubbles();

这是CSS:

// Sass Mixins

// Animation Mixin

@mixin animate($animation, $duration, $repeat, $easing) {
-webkit-animation: $animation $duration $repeat $easing;
   -moz-animation: $animation $duration $repeat $easing;
    -ms-animation: $animation $duration $repeat $easing;
        animation: $animation $duration $repeat $easing;
}


// Keyframes Mixin
// https://gist.github.com/ericam/1607696

@mixin keyframes($name) {
@-webkit-keyframes #{$name} {
    @content; 
}
@-moz-keyframes #{$name} {
    @content;
}
@-ms-keyframes #{$name} {
    @content;
}
@keyframes #{$name} {
    @content;
} 
}


// Main Styles

html,
body {
height: 100%;
}

body {
background: #09f;

@include background-image(linear-gradient(bottom, #09f, #45d1ff));
}



// Bubble Styles

.bubbles {
position: relative;
overflow: hidden;
width: 100%;
height: 100%;
margin: 0 auto;
}

.bubble-container {  
position: absolute;
bottom: 0;

@include animate(bubblerise, 4s, infinite, ease-in);
@include opacity(0);
}

.bubble {  
width: 6px;
height: 6px;
margin: 0 auto;
border: 1px solid rgba(255,255,255,0.5);
background: rgba(255,255,255,0.25);

@include border-radius(10px);
@include animate(bubblewobble, 0.4s, infinite, linear);
}


// Keyframe Animations

@include keyframes(bubblerise) {
0% {    
    bottom: 0;

@include opacity(0);
}
5% {    
    bottom: 0;

@include opacity(1);
}
99% {
    @include opacity(1);
}
100% {    
    bottom: 100%;

@include opacity(0);
}
}


@include keyframes(bubblewobble) {
0% {
    margin-left: 0;
}
50% {
    margin-left: 2px;
}
}

所以基本上我试图编辑这个部分:

// Randomise their speed (3-8s)
var speed_rand = 3 + Math.floor(Math.random() * 3);

对此:

// Randomise their speed (3-8s)
var speed_rand = 2 + Math.floor(Math.random() * 0.5);

它加快了气泡的速度,但它们同时从页面底部开始一起移动,这使得它看起来不切实际,而且有些气泡也比其他气泡快得多。

4

1 回答 1

1

通过更改 3 -> 0.5,您降低了速度,但也降低了可变性(实际上,使所有速度相同,因为Math.floor(Math.random() * 0.5)始终为零)。您可能想要增加第一个值:

var speed_rand = 0.5 + Math.random() * 2;
                 ^                     ^
           min time: 0.5 sec      variability: add between 0 and 2 sec
于 2013-10-21T20:14:54.050 回答