From d32a609defde13bb09e3f545b158212f1de96539 Mon Sep 17 00:00:00 2001
From: Alistair <you@example.com>
Date: Sat, 30 Jun 2018 17:51:00 +1200
Subject: [PATCH] Add animated hero according to design spec, fixes #78

---
 pinaxcon/templates/flatpages/homepage.html |  27 +++-
 static/src/js/lot_hero.js                  | 171 +++++++++++++++++++++
 static/src/js/lot_word.js                  |  19 +++
 static/src/scss/app.scss                   |  50 ++++--
 4 files changed, 248 insertions(+), 19 deletions(-)
 create mode 100644 static/src/js/lot_hero.js
 create mode 100644 static/src/js/lot_word.js

diff --git a/pinaxcon/templates/flatpages/homepage.html b/pinaxcon/templates/flatpages/homepage.html
index 4842e54e..2fcb474d 100644
--- a/pinaxcon/templates/flatpages/homepage.html
+++ b/pinaxcon/templates/flatpages/homepage.html
@@ -10,13 +10,30 @@ crossorigin=""/>
 <script src="https://unpkg.com/leaflet@1.3.1/dist/leaflet.js"
 integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw=="
 crossorigin=""></script>
-
 {% endblock %}
+
 {% block body_out %}
 <div class="row">
   <div class="col-12">
-    <img src="{% static 'assets/Header_placeholder.jpg' %}" id="hero">
-    
+    <div class="content">
+      <h1 class="text-primary text-upper" id="loe-wrapper" style="z-index: 1;">
+        Linux <br />
+        <span id="of">of</span><br />
+        <span id="word" style="color: #ccd5c5;"></span>
+      </h1>
+
+      <canvas id="hero" style="z-index: -1;" width="0" height="0"></canvas>
+      <div>
+          <h1 id="things-heading" class="text-primary text-upper">Things</h1>
+      </div>
+
+      <div class="text-primary" id="bottom-wrapper" style="z-index: 1;">
+        <h2>21-25<br/>Jan 19<br/></h2>
+        <h4><small>University of Canterbury<br/>Christchurch, New Zealand</small></h4>
+      </div>
+      <a id="register-link" class="btn btn-secondary border-primary text-primary" href="/dashboard/">Register</a>
+
+    </div>
   </div>
 </div>
 
@@ -29,7 +46,7 @@ crossorigin=""></script>
       <div><img src="{% static 'assets/memorial.jpg' %}" /></div>
     </div>
   </div>
-
+  
   <div class="col-12 col-xl-6 content pt-5 pb-xl-5">
     <p>
       Themed <strong>Linux of Things</strong>, the 2019 linux.conf.au will again attract speakers and attendees from across the world to socialise, fraternise, lecture, listen, ask, answer and share with their peers.
@@ -61,6 +78,8 @@ crossorigin=""></script>
 {% endblock %}
 
 {% block extra_body %}
+<script src="{% static 'js/lot_word.js' %}" type="text/javascript"></script>
+<script src="{% static 'js/lot_hero.js' %}" type="text/javascript"></script>
 <script>
   var map = L.map('map',
   {
diff --git a/static/src/js/lot_hero.js b/static/src/js/lot_hero.js
new file mode 100644
index 00000000..adafda01
--- /dev/null
+++ b/static/src/js/lot_hero.js
@@ -0,0 +1,171 @@
+function hero() {
+  var timeouts = new Array(3);
+  let green = "#0F7C11";
+  let radius = 7;
+  let windowWidth;
+  let breakPoint = 768;
+  
+  var loeWrapper = document.getElementById("loe-wrapper");
+  var loeOf = document.getElementById("of");
+  var canvas = document.getElementById("hero");
+  var bottomWrapper = document.getElementById("bottom-wrapper");
+  var registerLink = document.getElementById("register-link");
+  var thingsHeading = document.getElementById("things-heading");
+  
+  var ctx = canvas.getContext("2d");
+  var canvasPadding = 10;
+  
+  function positionRegisterLink() {
+    registerLink.style.position = 'static';
+    registerLink.style.float = 'none'; 
+    var offset = registerLink.offsetTop - loeOf.offsetTop - 0.25 * loeOf.offsetHeight;
+    if (window.innerWidth >= breakPoint) {
+      registerLink.style.top = -1 * offset + 'px';
+      registerLink.style.position = 'relative';
+      registerLink.style.float = 'right'; 
+    }
+  }
+  
+  function getCanvasPos() {
+    var canvasRatio = window.innerWidth < 576 ? 1.1 : 2.5;
+    var width = loeWrapper.offsetWidth - loeOf.offsetWidth - (2 * canvasPadding);
+    var minHeight = 180;
+    if (window.innerWidth >= breakPoint) {
+      width -= registerLink.offsetWidth;
+      minHeight = 260;
+    }
+    
+    return {
+      width: width,
+      height: Math.max(width / canvasRatio, minHeight),
+      left: loeOf.offsetWidth + canvasPadding,
+      top: -1.25 * loeOf.offsetHeight,
+    }
+  }
+  
+  function sizeCanvas(pos) {
+    var c = canvas;
+    c.width = pos.width;
+    c.height = pos.height;
+    c.style.width = pos.width + 'px';
+    c.style.height = pos.height + 'px';
+    c.style.position = 'relative';
+    c.style.left = pos.left + 'px';
+    c.style.top = pos.top + 'px';
+    c.style.marginBottom = c.style.top;
+  }
+  
+  function positionThingsHeading() {
+    thingsHeading.style.position = 'relative';
+    thingsHeading.style.display = 'inline-block';
+    var left = canvas.offsetWidth - thingsHeading.offsetWidth
+    if(window.innerWidth >= breakPoint) {
+      left += registerLink.offsetWidth;
+    }
+    thingsHeading.style.left = left + 'px';
+    thingsHeading.style.top = -0.7 * thingsHeading.offsetHeight + 'px';
+    thingsHeading.style.marginBottom = thingsHeading.style.top;
+  }
+  
+  function positionDate() {
+    bottomWrapper.style.position = 'static';
+    bottomWrapper.style.marginBottom = 0;
+    var offs = -0.7 * thingsHeading.offsetHeight;
+    offs -= bottomWrapper.offsetHeight * 0.8;
+    if (window.innerWidth >= 576) {
+      bottomWrapper.style.position = 'relative';
+      bottomWrapper.style.top = offs + 'px';
+      bottomWrapper.style.marginBottom = offs + 20 + 'px';
+    }
+  }
+  
+  let drawLine = (ind, context, startX, startY, endX, endY, color) => {
+    let dx = startX - endX;
+    let dy = startY - endY;
+    
+    let theta = Math.atan2(dy, dx);
+    var x = startX - 15 * Math.cos(theta);
+    var y = startY - 15 * Math.sin(theta);
+    
+    endX = endX + 30 * Math.cos(theta);
+    endY = endY + 30 * Math.sin(theta)
+    let delay = 8;
+    let increments = 2080 / delay;
+    let xAdjust = (endX - startX) / increments;
+    let yAdjust = (endY - startY) / increments;
+    let counter = 1;
+    
+    let line = () => {
+      context.beginPath();
+      context.lineWidth = 1.9;
+      context.moveTo(x, y);
+      x = x + xAdjust;
+      y = y + yAdjust;
+      context.lineTo(x, y);
+      context.strokeStyle = color;
+      context.stroke();
+      counter++;
+      if (counter <= increments) {
+        timeouts[ind] = window.setTimeout(line, delay);
+      }
+    };
+    timeouts[ind] = window.setTimeout(line, delay);
+  }
+  
+  let drawCircle = (context, x, y, radius, color) => {
+    context.beginPath();
+    context.fillStyle = color;
+    context.arc(x, y, radius, 0, 2 * Math.PI);
+    context.fill();
+  }
+  
+  function windowResize() {
+    if(window.innerWidth === windowWidth) {
+      // Catch mobile scroll event, as this can hide/unhide the address
+      // bar and fire a resize event.
+      return;
+    } else {
+      windowWidth = window.innerWidth;
+    }
+    for(var i = 0; i < 3; i++) {
+      window.clearTimeout(timeouts[i]);
+    }
+    var canvasPos = getCanvasPos();
+    sizeCanvas(canvasPos)
+    positionThingsHeading();
+    positionDate();
+    
+    function getLowestPoint() {
+      var pos = thingsHeading.offsetLeft - canvas.offsetLeft - 20;
+      if(pos < 10) {
+        pos = thingsHeading.offsetLeft + 0.5 * thingsHeading.offsetWidth;
+      }
+      return pos
+    }
+    
+    let points = [
+      [10, 10],
+      [canvasPos.width - 10, 10],
+      [
+        getLowestPoint(),
+        canvasPos.height -10
+      ]
+    ];
+    
+    positionRegisterLink();
+    
+    drawCircle(ctx, points[0][0], points[0][1], radius, green);
+    drawCircle(ctx, points[1][0], points[1][1], radius, green);
+    drawCircle(ctx, points[2][0], points[2][1], radius, green);
+    
+    drawLine(0, ctx, points[0][0], points[0][1], points[2][0], points[2][1], green);
+    drawLine(1, ctx, points[2][0], points[2][1], points[1][0], points[1][1], green);
+    drawLine(2, ctx, points[1][0], points[1][1], points[0][0], points[0][1], green);
+    
+  }
+  
+  windowResize();
+  window.addEventListener('resize', windowResize, false);
+}
+
+hero();
\ No newline at end of file
diff --git a/static/src/js/lot_word.js b/static/src/js/lot_word.js
new file mode 100644
index 00000000..60adf1e2
--- /dev/null
+++ b/static/src/js/lot_word.js
@@ -0,0 +1,19 @@
+function loeWord() {
+  var wordlist = ["health", "environment", "security", "communication", "people",];
+  var target = document.getElementById("word");
+
+  function getRandomInt(max) {
+    return Math.floor(Math.random() * Math.floor(max));
+  }
+
+  function setWord() {
+    target.innerText = wordlist[i%wordlist.length]
+    i += 1;
+  }
+  var i = getRandomInt(wordlist.length);
+
+  setWord()
+  setInterval(setWord, 5000)
+};
+
+loeWord();
\ No newline at end of file
diff --git a/static/src/scss/app.scss b/static/src/scss/app.scss
index 3abf9906..0aa8b512 100644
--- a/static/src/scss/app.scss
+++ b/static/src/scss/app.scss
@@ -20,15 +20,7 @@ body {
     overflow-x: hidden;
 }
 
-.navbar-brand {
-    width: 200px;
 
-    img {
-        max-width: 100%;
-        height: auto;
-    }
-    
-}
 
 .text-page {
     h2 {
@@ -71,17 +63,43 @@ html {
     font-size: 16px;
 }
 
+@import "nav.scss";
+@import "bootstrap.scss";
+
+h1 {
+    @include media-breakpoint-down(md) {
+        font-size: 3rem;
+    }
+}
+
+.navbar-brand {
+    @include media-breakpoint-up(md) {
+        width: 200px;
+    
+        img {
+            max-width: 100%;
+            height: auto;
+        }
+    }
+    img {
+
+        padding-left: $padding-left-default / 3;
+    }
+}
+
 footer {
     margin-top: 12rem;
-    padding-left: $padding-left-default;
+    padding-left: $padding-left-default / 3 !important;
     color: $primary;
-    font-size: 0.81rem
+    font-size: 0.81rem;
+
+    @include media-breakpoint-up(md) {
+        padding-left: $padding-left-default !important;
+    }
 }
 
 #hero {
     width: 100%;
-    padding-left: $padding-left-default;
-    padding-right: 5.3125rem;
 }
 
 .green-block {
@@ -107,12 +125,10 @@ main.container-fluid {
     padding: 0;
 }
 
-@import "nav.scss";
-@import "bootstrap.scss";
+
 
 
 .content {
-    //padding-top: 1rem;
     padding-bottom: 1rem;
     padding-left: $padding-left-default / 3 !important;
     padding-right: $padding-left-default / 3 !important; 
@@ -266,3 +282,7 @@ label.list-label {
         color: $primary;
     }
 }
+
+nav.navbar {
+    margin-bottom: 0;
+}
\ No newline at end of file