104 lines
3.7 KiB
JavaScript
104 lines
3.7 KiB
JavaScript
function clamp(min, val, max) {
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if (val < min) {
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val = min;
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}
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if (val > max) {
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val = max;
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}
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return val;
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}
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const scrollchecks = () => {
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var el = document.getElementById("header");
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el.style.backgroundPositionY = 50 + (document.documentElement.scrollTop/el.scrollHeight) / 2 * 100 + "%";
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Array.from(document.getElementsByClassName("scrolly")).forEach(el => {
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let box = el.getBoundingClientRect();
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if (box.bottom < 0 || box.top >= window.innerHeight) {
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el.classList.add("scrolly-out");
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el.classList.remove("scrolly-in");
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el.classList.remove("scrolly-onedge");
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}
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else {
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el.classList.remove("scrolly-out");
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el.classList.add("scrolly-in");
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el.classList.add("scrolly-entered");
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if (box.top <= 0 || box.bottom >= window.innerHeight) {
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el.classList.add("scrolly-onedge");
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}
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else {
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el.classList.remove("scrolly-onedge");
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}
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}
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if (box.top + box.height / 2 <= window.innerHeight / 2) {
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el.classList.add("scrolly-tophalf");
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el.classList.remove("scrolly-bottomhalf");
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}
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else {
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el.classList.remove("scrolly-tophalf");
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el.classList.add("scrolly-bottomhalf");
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}
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});
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var perc = clamp(0, document.getElementById("outer").scrollTop / (window.innerHeight / 2), 1);
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document.querySelector("#headin > h1").style.fontSize = 2 + 4 * (1 - perc) + "em";
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document.querySelector("#links").style.opacity = perc;
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//document.querySelector("#carousel").style.opacity = perc;
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};
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window.addEventListener("scroll", scrollchecks);
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window.addEventListener("scrollend", scrollchecks);
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window.addEventListener("wheel", scrollchecks);
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window.addEventListener("resize", scrollchecks);
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window.addEventListener("load", scrollchecks);
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window.addEventListener("touchmove", scrollchecks);
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setInterval(scrollchecks, 250); // Computers are fast and scrolling in JavaScript is dumb. Shoot me.
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var gallery_position = 0;
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var last_cycle = window.performance.now();
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var GALLERYSPEED = -100;
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var oldTouch = undefined;
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document.getElementById("carousel-inner").addEventListener("wheel", (evt) => {
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GALLERYSPEED = (-evt.deltaX + evt.deltaY) * 100;
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evt.preventDefault();
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});
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document.getElementById("carousel-inner").addEventListener("touchmove", (evt) => {
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var tuch = evt.touches[0];
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if (oldTouch) {
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GALLERYSPEED = -(oldTouch.pageX - tuch.pageX) * 100;
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}
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oldTouch = tuch;
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});
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document.getElementById("carousel-inner").addEventListener("touchend", () => {
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oldTouch = undefined;
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});
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function main() {
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var elapsed_time = window.performance.now() - last_cycle;
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last_cycle += elapsed_time;
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requestAnimationFrame(main);
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var el = document.getElementById("carousel-inner");
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if (getComputedStyle(el).getPropertyValue("--do-scroll") == "yes" && !oldTouch) {
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GALLERYSPEED = -100;
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}
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else {
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GALLERYSPEED *= Math.pow(0.1, elapsed_time / 1000)
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}
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gallery_position += GALLERYSPEED * elapsed_time / 1000;
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if (gallery_position > 0) {
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var hammer = el.lastChild;
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el.removeChild(hammer);
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var smol = el.scrollWidth;
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el.insertBefore(hammer, el.firstChild);
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gallery_position -= (el.scrollWidth - smol);
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}
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if (gallery_position < -(el.scrollWidth - window.innerWidth)) {
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var hammer = el.firstChild;
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el.removeChild(hammer);
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var smol = el.scrollWidth;
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el.appendChild(hammer);
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gallery_position += (el.scrollWidth - smol);
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}
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el.style.transform = "translate(" + gallery_position + "px, 0)";
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}
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main(); |