Update JS

_includes/head.html

@@ -20,4 +20,11 @@
     <!-- Styles -->
     <link rel="stylesheet" id="css-theme" href="{{ '/assets/css/main-' | append: site.theme_base | append: '.css' | prepend: site.baseurl }}">
     <link rel="stylesheet" href="{{ '/assets/css/highlight/' | append: site.highlighter_theme | append: '.css' | prepend: site.baseurl }}"> 
+  
+
+    <script src="/assets/js/bootstrap.min.js" defer></script> 
+    <script src="/assets/js/jquery.min.js" defer></script> 
+    <script src="/assets/js/d3.min.js" defer></script> 
+    <script type="text/javascript" src="{{ '/assets/js/main.js' | prepend: site.baseurl }}" defer></script> 
+
   </head>

assets/js/main.js

@@ -0,0 +1,89 @@
+let layer1, layer2, layer3, layer4;
+let themeBase;
+
+$(document).ready(() => {
+  layer1 = d3.select("#bg-layer1");
+  layer2 = d3.select("#bg-layer2");
+  layer3 = d3.select("#bg-layer3");
+  layer4 = d3.select("#bg-layer4");
+  themeBase = localStorage.getItem("themeBase") || document.getElementById("css-theme").getAttribute("href").match("-(light|dark).css")[1];
+  setTheme(themeBase);
+  makeStrips([layer1, layer2, layer3, layer4]);
+  $(document).scroll(updateBackground);
+  $(window).resize(updateBackground);
+  $("table").addClass("table table-hover");
+  $("img").addClass("img img-responsive");
+  $(".content-div > h1, .content-div > a > h1").addClass("h1-strip");
+  setTimeout(updateBackground, 500);
+});
+
+function drawLine(x, y, w, h, layer) {
+  let line = layer.append("rect")
+    .attr("x", x)
+    .attr("y", y)
+    .attr("width", w)
+    .attr("height", h)
+    .attr("fill", "url(#Gradient1)");
+}
+
+function updateBackground() {
+  // Update stripes
+  let contentX = ($(".content-div").offset().left);
+  let layer1Y = window.pageYOffset / 5;
+  let layer2Y = window.pageYOffset / 4;
+  let layer3Y = window.pageYOffset / 3;
+  let layer4Y = window.pageYOffset / 2;
+  layer1.attr("transform", `translate(${contentX}, ${-layer1Y})`);
+  layer2.attr("transform", `translate(${contentX}, ${-layer2Y})`);
+  layer3.attr("transform", `translate(${contentX}, ${-layer3Y})`);
+  layer4.attr("transform", `translate(${contentX}, ${-layer4Y})`);
+  // Update transparent overlays over h1
+  $(".h1-overlay").remove();
+  $(".h1-strip")
+    .filter((index, node) => $(node).isInViewport())
+    .map((index, node) => {
+      let {left, top, right, bottom, x, y, width, height} = node.getBoundingClientRect();
+      let style = window.getComputedStyle?getComputedStyle(node, null):node.currentStyle;
+      let marginTop = parseInt(style.marginTop) || 0;
+      let overlay = document.createElement("div");
+      overlay.classList.add("h1-overlay");
+      overlay.style.left = 0;
+      overlay.style.top = `${window.scrollY+top-marginTop}px`;
+      overlay.style.height = `${height+marginTop}px`;
+      document.body.appendChild(overlay);
+  });
+}
+
+function makeStrips(layers) {
+  let layerProbs = new Array(layers.length).fill(0).map((_, index) => index / layers.length);
+  for (let i = 10; i < 100; i *= 1.05) {
+    let index = Math.floor(Math.random() * layers.length);
+    let randomLayer = layers[index];
+    if (Math.random() > layerProbs[index]) {
+      drawLine(-i, 100, 1, 1000 * (Math.random() + 1), randomLayer);
+    }
+  }
+  updateBackground();
+}
+
+function toggleTheme() {
+  themeBase = themeBase == "light" ? "dark" : "light";
+  localStorage.setItem("themeBase", themeBase);
+  setTheme(themeBase);
+}
+
+function setTheme(themeBase) {
+  let oldTheme = themeBase == "light" ? "dark" : "light";
+  let href = document.getElementById("css-theme").getAttribute("href").replace(oldTheme, themeBase);
+  let css = document.getElementById("css-theme");
+  css.setAttribute("href", href);
+}
+
+// https://medium.com/talk-like/detecting-if-an-element-is-in-the-viewport-jquery-a6a4405a3ea2
+$.fn.isInViewport = function() {
+  var elementTop = $(this).offset().top;
+  var elementBottom = elementTop + $(this).outerHeight();
+  var viewportTop = $(window).scrollTop();
+  var viewportBottom = viewportTop + $(window).height();
+  return elementBottom > viewportTop && elementTop < viewportBottom;
+};