パーティクルを作成するライブラリ particles.js のデモ

https://vincentgarreau.com/particles.js/

使用しないページで読み込むと Cannot read properties of null エラーが出るので注意。
particles.min.js の下部に生成したコードを記述して、使用するページにのみ読み込むのが吉。

HTML

<div id="particles-js"></div>
<div class="container">
	<p>コンテンツ</p>
</div>
<script src="https://cdn.jsdelivr.net/particles.js/2.0.0/particles.min.js"></script>
<script src="./script.js"></script>

CSS

* {
	margin: 0;
	padding: 0;
}
html,
body {
	height: 100%;
}
#particles-js {
	position: fixed;
	z-index: -1;
	width: 100%;
	height: 100%;
	background-color: skyblue;
}
.container {
	width: 100%;
	height: 100%;
	display: flex;
	justify-content: center;
	align-items: center;
}

JavaScript

https://vincentgarreau.com/particles.js にアクセスしてジェネレーターで好みの効果を作成する。
最後に「Codepen」ボタンを押す。

JavaScriptのコードを取得する。この時「var count_particles, stats, update; stats = new Stats;」以下は不要。

水の泡

particlesJS("particles-js", {"particles":{"number":{"value":6,"density":{"enable":true,"value_area":800}},"color":{"value":"#ffffff"},"shape":{"type":"circle","stroke":{"width":0,"color":"#000"},"polygon":{"nb_sides":6},"image":{"src":"img/github.svg","width":100,"height":100}},"opacity":{"value":0.3,"random":true,"anim":{"enable":false,"speed":1,"opacity_min":0.1,"sync":false}},"size":{"value":12.02559045649142,"random":true,"anim":{"enable":true,"speed":10,"size_min":40,"sync":false}},"line_linked":{"enable":false,"distance":200,"color":"#ffffff","opacity":1,"width":2},"move":{"enable":true,"speed":3.206824121731046,"direction":"top","random":true,"straight":false,"out_mode":"out","bounce":false,"attract":{"enable":false,"rotateX":600,"rotateY":1200}}},"interactivity":{"detect_on":"canvas","events":{"onhover":{"enable":false,"mode":"grab"},"onclick":{"enable":false,"mode":"push"},"resize":true},"modes":{"grab":{"distance":400,"line_linked":{"opacity":1}},"bubble":{"distance":400,"size":40,"duration":2,"opacity":8,"speed":3},"repulse":{"distance":200,"duration":0.4},"push":{"particles_nb":4},"remove":{"particles_nb":2}}},"retina_detect":true});

画像（複数）

particlesJS("particles-js", {"particles":{"number":{"value":6,"density":{"enable":true,"value_area":800}},"color":{"value":"#ffffff"},"shape":{"type":["image", "image", "image"],"stroke":{"width":0,"color":"#000"},"polygon":{"nb_sides":6},"image":{"src":"shape.png","width":100,"height":100}},"opacity":{"value":0.3,"random":true,"anim":{"enable":false,"speed":1,"opacity_min":0.1,"sync":false}},"size":{"value":12.02559045649142,"random":true,"anim":{"enable":true,"speed":10,"size_min":40,"sync":false}},"line_linked":{"enable":false,"distance":200,"color":"#ffffff","opacity":1,"width":2},"move":{"enable":true,"speed":3.206824121731046,"direction":"top","random":true,"straight":false,"out_mode":"out","bounce":false,"attract":{"enable":false,"rotateX":600,"rotateY":1200}}},"interactivity":{"detect_on":"canvas","events":{"onhover":{"enable":false,"mode":"grab"},"onclick":{"enable":false,"mode":"push"},"resize":true},"modes":{"grab":{"distance":400,"line_linked":{"opacity":1}},"bubble":{"distance":400,"size":40,"duration":2,"opacity":8,"speed":3},"repulse":{"distance":200,"duration":0.4},"push":{"particles_nb":4},"remove":{"particles_nb":2}}},"retina_detect":true});

particlesJS("particles-js2", {"particles":{"number":{"value":6,"density":{"enable":true,"value_area":800}},"color":{"value":"#ffffff"},"shape":{"type":["image", "image", "image"],"stroke":{"width":0,"color":"#000"},"polygon":{"nb_sides":6},"image":{"src":"shape2.png","width":100,"height":100}},"opacity":{"value":0.3,"random":true,"anim":{"enable":false,"speed":1,"opacity_min":0.1,"sync":false}},"size":{"value":12.02559045649142,"random":true,"anim":{"enable":true,"speed":10,"size_min":40,"sync":false}},"line_linked":{"enable":false,"distance":200,"color":"#ffffff","opacity":1,"width":2},"move":{"enable":true,"speed":3.206824121731046,"direction":"top","random":true,"straight":false,"out_mode":"out","bounce":false,"attract":{"enable":false,"rotateX":600,"rotateY":1200}}},"interactivity":{"detect_on":"canvas","events":{"onhover":{"enable":false,"mode":"grab"},"onclick":{"enable":false,"mode":"push"},"resize":true},"modes":{"grab":{"distance":400,"line_linked":{"opacity":1}},"bubble":{"distance":400,"size":40,"duration":2,"opacity":8,"speed":3},"repulse":{"distance":200,"duration":0.4},"push":{"particles_nb":4},"remove":{"particles_nb":2}}},"retina_detect":true});

particlesJS("particles-js3", {"particles":{"number":{"value":6,"density":{"enable":true,"value_area":800}},"color":{"value":"#ffffff"},"shape":{"type":["image", "image", "image"],"stroke":{"width":0,"color":"#000"},"polygon":{"nb_sides":6},"image":{"src":"shape3.png","width":100,"height":100}},"opacity":{"value":0.3,"random":true,"anim":{"enable":false,"speed":1,"opacity_min":0.1,"sync":false}},"size":{"value":12.02559045649142,"random":true,"anim":{"enable":true,"speed":10,"size_min":40,"sync":false}},"line_linked":{"enable":false,"distance":200,"color":"#ffffff","opacity":1,"width":2},"move":{"enable":true,"speed":3.206824121731046,"direction":"top","random":true,"straight":false,"out_mode":"out","bounce":false,"attract":{"enable":false,"rotateX":600,"rotateY":1200}}},"interactivity":{"detect_on":"canvas","events":{"onhover":{"enable":false,"mode":"grab"},"onclick":{"enable":false,"mode":"push"},"resize":true},"modes":{"grab":{"distance":400,"line_linked":{"opacity":1}},"bubble":{"distance":400,"size":40,"duration":2,"opacity":8,"speed":3},"repulse":{"distance":200,"duration":0.4},"push":{"particles_nb":4},"remove":{"particles_nb":2}}},"retina_detect":true});