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bg: fix rendering issues and improve speed

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Naman Sood 2021-06-16 04:33:45 -04:00 • committed by GitHub
parent b08461ce82
commit 115d5ed946
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 41 additions and 40 deletions
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2
css/style.css
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@ -448,7 +448,7 @@ footer {
width: 100%;
height: 100%;
opacity: 0;
transition: all 0.225s ease;
will-change: opacity;
}
@media (min-width: 1800px) {

3
css/style.scss
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@ -517,7 +517,8 @@ footer {
width: 100%;
height: 100%;
opacity: 0;
transition: all 0.225s ease;
//transition: all 0.225s linear;
will-change: opacity;
}
}

72
js/script.js
View file

@ -32,46 +32,39 @@ function bgInit(useCSSbg) {
bgInit(false);
var scrolledWindows, minBg, maxBg, delta, ogDelta;
function calculateBg() {
if(!mobileConditions()) {
bgInit(false);
$('.bg-scroller').find('.bg').each(function() {
$(this).css('opacity', '0');
});
scrolledWindows = $(window).scrollTop() / $(window).height();
// start hax: subtract number of sections above changing background
scrolledWindows -= $($('.works-card')[0]).offset().top / $(window).height();
scrolledWindows = Math.max(scrolledWindows, 0);
// end hax
minBg = Math.floor(scrolledWindows);
maxBg = minBg + 1;
delta = scrolledWindows - minBg;
ogDelta = delta;
if(delta < 0.4) {
let backgrounds = $('.bg-scroller').find('.bg');
let bgOps = new Array(backgrounds.length).fill(0);
let textOps = new Array(backgrounds.length).fill(0);
let scrolledWindows = ($(window).scrollTop() - $(window).height()) / $(window).height();
if(scrolledWindows < 0) scrolledWindows = 0;
let minBg = Math.floor(scrolledWindows);
let maxBg = minBg + 1;
let delta = scrolledWindows - minBg;
if(delta < 0.3) {
delta = 0;
}
else if(delta < 0.6) {
delta = 5*(delta-0.4);
else if(delta < 0.7) {
delta = 2.5*(delta-0.3);
}
else {
delta = 1;
}
delta = -1 * Math.cos(delta/1 * (Math.PI/2)) + 1;
//delta = -1 * Math.cos(delta/1 * (Math.PI/2)) + 1;
$('.bg-scroller').find('.bg:nth-child(' + (minBg+1) + ')').css('opacity', 1);
$('.bg-scroller').find('.bg:nth-child(' + (maxBg+1) + ')').css('opacity', delta);
$('.works-card:nth-child(' + (minBg+2) + ') .text-container').css({
opacity: 1 - delta,
bgOps[minBg] = 1;
bgOps[maxBg] = delta;
backgrounds.each(function(i) {
$(this).css('opacity', bgOps[i]);
});
$('.works-card:nth-child(' + (maxBg+2) + ') .text-container').css({
opacity: delta,
textOps[minBg] = 1-delta;
textOps[maxBg] = delta;
$('.works-card .text-container').each(function(i) {
$(this).css('opacity', textOps[i]);
});
}
@ -84,9 +77,7 @@ calculateBg();
var timer;
$(window).on('scroll', function() {
scrollAnimations();
setInterval(function() {
clearTimeout(timer);
timer = setTimeout(function() {
@ -103,13 +94,13 @@ $(window).on('scroll', function() {
}
});
if(hash) {
if(hash && '#' + hash != location.hash) {
history.replaceState({
page: hash
}, $('title').html(), '#' + hash);
}
}, 200);
});
}, 500);
function scrollAnimations() {
calculateBg();
@ -127,6 +118,13 @@ function scrollAnimations() {
}
}
//window.addEventListener('scroll', scrollAnimations);
function scrollLoop() {
scrollAnimations();
requestAnimationFrame(scrollLoop);
}
scrollLoop();
var canvas = $('canvas#bg')[0];
canvas.width = $(window).width();
@ -195,10 +193,12 @@ for(var i = 0; i < n; i++) {
}
function loop() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
if($(window).scrollTop() <= $(window).height()) {
ctx.clearRect(0, 0, canvas.width, canvas.height);
for(var i = 0; i < n; i++) {
dots[i].render();
for(var i = 0; i < n; i++) {
dots[i].render();
}
}
requestAnimationFrame(loop);