Scanline modifications, change default weather channel branding to a slackware linux style weather branding
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10 changed files with 354 additions and 128 deletions
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@ -1,130 +1,243 @@
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/* REGULAR SCANLINES SETTINGS */
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/* =========================================================
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REGULAR SCANLINES SETTINGS
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========================================================= */
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// width of 1 scanline (responsive units to prevent banding)
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$scan-width: 1px;
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$scan-width-scaled: 0.15vh; // viewport-relative unit for better scaling
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// emulates a damage-your-eyes bad pre-2000 CRT screen ♥ (true, false)
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$scan-crt: false;
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// frames-per-second (should be > 1), only applies if $scan-crt: true;
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$scan-fps: 20;
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// scanline-color (rgba)
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$scan-color: rgba(#000, .3);
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// set z-index on 8, like in ♥ 8-bits ♥, or…
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// set z-index on 2147483648 or more to enable scanlines on Chrome fullscreen (doesn't work in Firefox or IE);
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$scan-color: rgba(#000, 0.30);
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$scan-z-index: 2147483648;
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/* MOVING SCANLINE SETTINGS */
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// moving scanline (true, false)
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$scan-moving-line: true;
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$scan-opacity: 0.75;
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// opacity of the moving scanline
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$scan-opacity: .75;
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/* =========================================================
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CRT / S-VIDEO EFFECT SETTINGS
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========================================================= */
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/* MIXINS */
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// whole-screen softness
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$crt-soft-blur: 0.45px;
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// apply CRT animation: @include scan-crt($scan-crt);
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@mixin scan-crt($scan-crt) {
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@if $scan-crt==true {
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animation: scanlines 1s steps($scan-fps) infinite;
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}
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// mild brightening / contrast to keep blur from looking muddy
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$crt-contrast: 1.04;
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$crt-saturation: 1.08;
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$crt-brightness: 0.98;
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@else {
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animation: none;
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}
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// fake horizontal chroma bleed
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$crt-r-shift: -0.7px;
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$crt-b-shift: 0.7px;
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$crt-bleed-blur: 1.2px;
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$crt-rgb-opacity: 0.04;
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// subtle tube edge darkening
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$crt-vignette-opacity: 0.16;
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// optional tiny bloom
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$crt-glow-opacity: 0.05;
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/* =========================================================
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MIXINS
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========================================================= */
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@mixin scan-crt($enabled) {
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@if $enabled == true {
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animation: scanlines 1s steps($scan-fps) infinite;
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} @else {
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animation: none;
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}
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}
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// apply CRT animation: @include scan-crt($scan-crt);
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@mixin scan-moving($scan-moving-line) {
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@if $scan-moving-line==true {
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animation: scanline 6s linear infinite;
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}
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@else {
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animation: none;
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}
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@mixin scan-moving($enabled) {
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@if $enabled == true {
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animation: scanline 6s linear infinite;
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} @else {
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animation: none;
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}
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}
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/* CSS .scanlines CLASS */
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/* =========================================================
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APPLY TO THE REAL APP CONTAINER
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========================================================= */
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/*
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You can add class="scanlines" to #divTwcMain or #container.
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Example:
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<div id="divTwcMain" class="scanlines">
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*/
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.scanlines {
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position: relative;
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overflow: hidden; // only to animate the unique scanline
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position: relative;
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overflow: hidden;
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isolation: isolate;
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&:before,
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&:after {
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display: block;
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pointer-events: none;
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content: '';
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position: absolute;
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}
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/*
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This is the actual rendered weather area in your HTML.
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Applying the softness here affects the maps/text/icons themselves.
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*/
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#container {
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position: relative;
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z-index: 1;
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transform: translateZ(0);
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will-change: filter;
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// unique scanline travelling on the screen
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&:before {
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// position: absolute;
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// bottom: 100%;
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width: 100%;
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height: $scan-width * 1;
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z-index: $scan-z-index + 1;
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background: $scan-color;
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opacity: $scan-opacity;
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// animation: scanline 6s linear infinite;
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@include scan-moving($scan-moving-line);
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}
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filter:
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blur($crt-soft-blur)
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saturate($crt-saturation)
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contrast($crt-contrast)
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brightness($crt-brightness);
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}
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// the scanlines, so! - with responsive scaling for low-res displays
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&:after {
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top: 0;
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right: 0;
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bottom: 0;
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left: 0;
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z-index: $scan-z-index;
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// repeating-linear-gradient is more efficient than linear-gradient+background-size because it doesn't require the browser to calculate tiling
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background: repeating-linear-gradient(to bottom,
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transparent 0,
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transparent $scan-width,
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$scan-color $scan-width,
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$scan-color calc($scan-width * 2));
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@include scan-crt($scan-crt);
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/*
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Red fringe overlay
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*/
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#container::before,
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#container::after {
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content: '';
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position: absolute;
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inset: 0;
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pointer-events: none;
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z-index: 3;
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}
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// Prevent sub-pixel aliasing on scaled displays
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image-rendering: crisp-edges;
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image-rendering: pixelated;
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}
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#container::before {
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background:
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linear-gradient(
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to right,
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rgba(255, 0, 0, $crt-rgb-opacity) 0%,
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rgba(255, 0, 0, 0.01) 15%,
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rgba(255, 0, 0, 0.00) 50%,
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rgba(255, 0, 0, 0.01) 85%,
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rgba(255, 0, 0, $crt-rgb-opacity) 100%
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);
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transform: translateX($crt-r-shift);
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filter: blur($crt-bleed-blur);
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mix-blend-mode: screen;
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}
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// Scanlines use dynamic thickness calculated by JavaScript
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// JavaScript calculates optimal thickness to prevent banding at any scale factor
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// The --scanline-thickness custom property is set by applyScanlineScaling()
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// The modes (hairline, thin, medium, thick) force the base thickness selection
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// Some modes may appear the same (e.g. hairline and thin) depending on the display
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&:before {
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height: var(--scanline-thickness, $scan-width);
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}
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/*
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Blue fringe overlay
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*/
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#container::after {
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background:
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linear-gradient(
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to right,
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rgba(0, 140, 255, $crt-rgb-opacity) 0%,
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rgba(0, 140, 255, 0.01) 15%,
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rgba(0, 140, 255, 0.00) 50%,
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rgba(0, 140, 255, 0.01) 85%,
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rgba(0, 140, 255, $crt-rgb-opacity) 100%
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);
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transform: translateX($crt-b-shift);
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filter: blur($crt-bleed-blur);
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mix-blend-mode: screen;
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}
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&:after {
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background: repeating-linear-gradient(to bottom,
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transparent 0,
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transparent var(--scanline-thickness, $scan-width),
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$scan-color var(--scanline-thickness, $scan-width),
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$scan-color calc(var(--scanline-thickness, $scan-width) * 2));
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}
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/*
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Moving scanline
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*/
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&:before,
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&:after {
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display: block;
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pointer-events: none;
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content: '';
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position: absolute;
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left: 0;
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right: 0;
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}
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&:before {
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height: var(--scanline-thickness, $scan-width);
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z-index: $scan-z-index + 2;
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background: $scan-color;
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opacity: $scan-opacity;
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@include scan-moving($scan-moving-line);
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}
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/*
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Regular scanline mask
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*/
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&:after {
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top: 0;
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bottom: 0;
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z-index: $scan-z-index;
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background: repeating-linear-gradient(
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to bottom,
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transparent 0,
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transparent var(--scanline-thickness, $scan-width),
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$scan-color var(--scanline-thickness, $scan-width),
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$scan-color calc(var(--scanline-thickness, $scan-width) * 2)
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);
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@include scan-crt($scan-crt);
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}
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/*
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Vignette layer
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Added as an inset shadow so you don't need extra HTML
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*/
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box-shadow:
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inset 0 0 80px rgba(0, 0, 0, $crt-vignette-opacity),
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inset 0 0 18px rgba(255, 255, 255, $crt-glow-opacity);
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}
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/* ANIMATE UNIQUE SCANLINE */
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/* =========================================================
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OPTIONAL: only affect active weather panels, not menus
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========================================================= */
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/*
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If the controls / bottom nav get too blurry, move the blur
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from #container to the weather slides only:
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*/
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.scanlines.crt-panels-only {
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#container {
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filter: none;
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}
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.weather-display {
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filter:
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blur($crt-soft-blur)
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saturate($crt-saturation)
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contrast($crt-contrast)
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brightness($crt-brightness);
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transform: translateZ(0);
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}
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}
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/* =========================================================
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OPTIONAL: make text slightly glow like old TV phosphors
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========================================================= */
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.scanlines {
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.header,
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.main,
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.scroll,
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.date-time,
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.city,
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.temp,
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.condition,
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.location,
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.label,
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.value,
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.title {
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text-shadow:
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0 0 1px rgba(255, 255, 255, 0.18),
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0 0 2px rgba(255, 255, 255, 0.06);
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}
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}
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/* =========================================================
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ANIMATIONS
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========================================================= */
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@keyframes scanline {
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0% {
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transform: translate3d(0, 200000%, 0);
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// bottom: 0%; // to have a continuous scanline move, use this line (here in 0% step) instead of transform and write, in &:before, { position: absolute; bottom: 100%; }
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}
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0% {
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transform: translate3d(0, 200000%, 0);
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}
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}
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@keyframes scanlines {
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0% {
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background-position: 0 50%;
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// bottom: 0%; // to have a continuous scanline move, use this line (here in 0% step) instead of transform and write, in &:before, { position: absolute; bottom: 100%; }
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}
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0% {
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background-position: 0 50%;
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}
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}
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