99 lines
No EOL
3.7 KiB
JavaScript
99 lines
No EOL
3.7 KiB
JavaScript
(function () {
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const num_clouds = 200,
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max_cloud_size = 500,
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max_speed_x = 50,
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max_speed_y = 30,
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num_clusters = 5;
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let cluster_x, cluster_y, cluster_size, cloud_counter;
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const sky = document.getElementById("sky");
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sky.width = window.innerWidth;
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sky.height = window.innerHeight;
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sky.onclick = () => {
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sky.requestFullscreen().then();
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};
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let width = window.innerWidth,
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height = window.innerHeight;
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let oldWidth = width, oldHeight = height;
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window.onresize = () => {
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oldWidth = width;
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oldHeight = height;
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width = window.innerWidth;
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height = window.innerHeight;
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};
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let create_clouds = function () {
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for (let i = 0; i < num_clouds; i++) {
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let newCloud = document.createElement("div");
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newCloud.setAttribute("id", "cloud-" + i);
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newCloud.setAttribute("class", "cloud");
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const size = 200 + Math.random() * max_cloud_size;
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newCloud.style.width = size + "px";
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newCloud.style.height = size + "px";
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newCloud.style.background = "radial-gradient(circle " + size / 2 + "px, rgba(255, 255, 255, " + Math.random() / 5 + "), rgba(20, 56, 200, 0.0)) no-repeat";
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newCloud.setAttribute("size", "" + size);
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sky.appendChild(newCloud);
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}
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}
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let arrange_clouds = function () {
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for (let i = 0; i < num_clouds; i++) {
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if (i % (Math.floor(num_clouds / num_clusters)) === 0) {
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cluster_x = Math.random() * width;
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cluster_y = Math.random() * height;
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cluster_size = 400;
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}
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let cloud = get_cloud(i);
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cloud.style.top = cluster_x - cluster_size / 2 + Math.random() * cluster_size + "px";
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cloud.style.left = cluster_y - cluster_size / 2 + Math.random() * cluster_size + "px";
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}
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cluster_size = Math.random() * max_cloud_size;
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cluster_x = width + cluster_size + Math.random() * width;
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cluster_y = height + cluster_size + Math.random() * height;
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}
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let step = function () {
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let cloud = get_cloud(Math.floor(Math.random() * num_clouds));
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let x = parseInt(cloud.style.left), y = parseInt(cloud.style.top);
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x -= Math.random() * max_speed_x;
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y -= Math.random() * max_speed_y;
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if (x < -max_cloud_size && y < -max_cloud_size) {
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cloud_counter += 1;
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if (cloud_counter > (num_clouds / num_clusters)) {
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cluster_size = Math.random() * max_cloud_size;
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cluster_x = width + cluster_size + Math.random() * width;
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cluster_y = height + cluster_size + Math.random() * height;
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cloud_counter = 0;
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}
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cloud.style.transition = "none";
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cloud.style.top = (cluster_x + Math.random() * cluster_size) + "px";
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cloud.style.left = (cluster_y + Math.random() * cluster_size) + "px";
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let size = parseInt(cloud.getAttribute("size")) + Math.random();
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cloud.style.width = size + "px";
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cloud.style.height = size + "px";
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cloud.setAttribute("size", "" + size);
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cloud.style.background = "radial-gradient(circle " + size / 2 + "px, rgba(255, 255, 255, " + Math.random() / 5 + "), rgba(20, 56, 200, 0.0)) no-repeat";
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} else {
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cloud.style.transition = "left 5s, top 5s";
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cloud.style.left = x + "px";
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cloud.style.top = y + "px";
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}
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requestAnimationFrame(step);
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};
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let get_cloud = function (index) {
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return document.getElementById("cloud-" + index);
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}
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create_clouds();
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arrange_clouds();
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requestAnimationFrame(step);
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})() |