From 472e81a2b713e6149af4e56e4046c1aa6a9c1812 Mon Sep 17 00:00:00 2001
From: Dante Catalfamo
Date: Fri, 3 Jul 2020 14:43:05 -0400
Subject: Add braille

---
 braille.js | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 index.html | 38 ++++++++++++++++++++--------------
 lambda.js  | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 script.js  | 70 --------------------------------------------------------------
 4 files changed, 159 insertions(+), 86 deletions(-)
 create mode 100644 braille.js
 create mode 100644 lambda.js
 delete mode 100644 script.js

diff --git a/braille.js b/braille.js
new file mode 100644
index 0000000..8d94db7
--- /dev/null
+++ b/braille.js
@@ -0,0 +1,67 @@
+"use strict";
+
+const OUTHEIGHT = 20;
+const OUTWIDTH = 2 * OUTHEIGHT;
+const HEIGHT = 3 * OUTHEIGHT;
+const WIDTH = 2 * OUTWIDTH;
+const BRAILLE = [
+  "⠀", "⠁", "⠂", "⠃", "⠄", "⠅", "⠆", "⠇", "⠈", "⠉", "⠊", "⠋", "⠌", "⠍", "⠎", "⠏",
+  "⠐", "⠑", "⠒", "⠓", "⠔", "⠕", "⠖", "⠗", "⠘", "⠙", "⠚", "⠛", "⠜", "⠝", "⠞", "⠟",
+  "⠠", "⠡", "⠢", "⠣", "⠤", "⠥", "⠦", "⠧", "⠨", "⠩", "⠪", "⠫", "⠬", "⠭", "⠮", "⠯",
+  "⠰", "⠱", "⠲", "⠳", "⠴", "⠵", "⠶", "⠷", "⠸", "⠹", "⠺", "⠻", "⠼", "⠽", "⠾", "⠿",
+];
+
+let board = new Array(HEIGHT);
+for (let i = 0; i < HEIGHT; i++) {
+  board[i] = new Array(WIDTH);
+}
+
+function render(board) {
+  const out = new Array(OUTHEIGHT);
+  for (let i = 0; i < OUTHEIGHT; i++) {
+    out[i] = new Array(OUTWIDTH);
+  }
+  for (let y = 0; y < HEIGHT; y += 3) {
+    for (let x = 0; x < WIDTH; x += 2) {
+      let outx = x/2;
+      let outy = y/3;
+      let tl = board[y][x] ? 1 : 0;
+      let ml = board[y+1][x] ? 1 : 0;
+      let bl = board[y+2][x] ? 1 : 0;
+      let tr = board[y][x+1] ? 1 : 0;
+      let mr = board[y+1][x+1] ? 1 : 0;
+      let br = board[y+2][x+1] ? 1 : 0;
+      let idx = tl*1 + ml*2 +  bl*4 + tr*8 + mr*16 + br*32;
+      let char = BRAILLE[idx];
+      out[outy][outx] = char;
+    }
+  }
+  return out.reduce((a, r) => a + r.reduce((a2, c) => a2 + c) + "\n", "");
+}
+
+function renderFunction(board, fun, frame) {
+  for (let y = 0; y < HEIGHT; y++) {
+    for (let x = 0; x < WIDTH; x++) {
+      board[y][x] = fun(x, y, frame) ? true : null;
+    }
+  }
+  return render(board);
+}
+
+function fun(x, y, frame) {
+  const l = HEIGHT / 3;
+  const m1 = Math.abs(y+frame) % l;
+  const m2 = Math.abs(y-frame) % l;
+  return x == m1 ||
+    x == m2 ||
+    x/2 == m1 + l/2 ||
+    x/2 == m2 + l/2 ||
+    x == m1 + 3*l ||
+    x == m2 + 3*l;
+}
+
+const br = document.getElementById("braille");
+let frame = HEIGHT;
+const interval = setInterval(() => {
+  br.innerHTML = renderFunction(board, fun, frame++);
+}, 50);
diff --git a/index.html b/index.html
index 5dce83d..a995095 100644
--- a/index.html
+++ b/index.html
@@ -7,34 +7,38 @@
     <title>lambda.cx home</title>
     <style>
      body {
-         background: black;
-         font-family: monospace;
+       background: black;
+       color: white;
+       font-family: monospace;
+     }
+     #braille {
+       line-height: .92;
      }
      .bigguy {
-         display: flex;
+       display: flex;
      }
      .lambda {
-         font-family: Andale Mono, monospace;
-         font-size: 12px;
-         display: inline-block;
+       font-family: Andale Mono, monospace;
+       font-size: 12px;
+       display: inline-block;
      }
      .linkbox {
-         display: flex;
-         align-items: center;
-         justify-content: center;
-         flex: 1;
+       display: flex;
+       align-items: center;
+       justify-content: center;
+       flex: 1;
      }
      .links {
-         font-size: 16px;
-         display: inline-block;
+       font-size: 16px;
+       display: inline-block;
      }
      .links > span {
        color: white;
      }
      @media only screen and (max-width: 440px) {
-         .bigguy {
-             display: block;
-         }
+       .bigguy {
+         display: block;
+       }
      }
     </style>
   </head>
@@ -42,12 +46,14 @@
     <div class="bigguy">
       <pre class="lambda"></pre>
       <div class="linkbox">
+        <pre id="braille"></pre>
         <div class="links">
           <span>==&gt; </span><a href="https://blog.lambda.cx">blog</a><br/>
           <span>==&gt; </span><a href="https://github.com/dantecatalfamo">github</a>
         </div>
       </div>
     </div>
-    <script src="script.js"></script>
+    <script src="lambda.js"></script>
+    <script src="braille.js"></script>
   </body>
 </html>
diff --git a/lambda.js b/lambda.js
new file mode 100644
index 0000000..85037c3
--- /dev/null
+++ b/lambda.js
@@ -0,0 +1,70 @@
+function coss(height, width, theta) {
+  let amplitude = height/2;
+  let period = width;
+  let dx = Math.PI/width;
+  let yVal = [];
+  let x = theta;
+
+  for(let i=0;i<width;i++){
+    yVal.push((Math.cos(x)*amplitude)+(height/2));
+    x += dx;
+  }
+  return yVal;
+}
+
+function lamby(height, width, thick) {
+  let out = "";
+  let yvals = coss(height, width, Math.PI);
+  let halfWidth = width/2;
+
+  for(let y=0;y<height;y++){
+    for(let x=0;x<width;x++){
+      let posy = yvals[x];
+      let negy = height-posy;
+      if (Math.abs(posy-y) < thick) {
+        out += "<span style=\"color: hsl("+ (Math.abs(posy-y)/thick*260) +",100%, 50%)\">&lambda;</span>";
+      } else if ((x < halfWidth) && (Math.abs(negy-y) < thick)) {
+        out += "<span style=\"color: hsl("+ (Math.abs(negy-y)/thick*260) +",100%, 50%)\">&lambda;</span>";
+      } else {
+        out += " ";
+      }
+    }
+    out += "\n";
+  }
+  return out;
+}
+
+function putlam(el, height, width, min, max, period) {
+  let amp = max-min;
+  const f = function() {
+    let percent = (Math.sin(((new Date).getTime()/period)) + 1) / 2;
+    let thick = (amp * percent) + min;
+    el.innerHTML = lamby(height, width, thick);
+  };
+  window.setInterval(f, 100);
+}
+
+let lamEl = document.querySelector('.lambda');
+putlam(lamEl, 45, 45, 0.3, 4.5, 450);
+
+
+`
+00
+  0
+   0
+  0 0
+ 0   0
+0     00
+
+0
+ 0
+0 0
+
+_
+  \
+   \
+   /\
+  /  \
+ /    \
+/      \_
+`;
diff --git a/script.js b/script.js
deleted file mode 100644
index 85037c3..0000000
--- a/script.js
+++ /dev/null
@@ -1,70 +0,0 @@
-function coss(height, width, theta) {
-  let amplitude = height/2;
-  let period = width;
-  let dx = Math.PI/width;
-  let yVal = [];
-  let x = theta;
-
-  for(let i=0;i<width;i++){
-    yVal.push((Math.cos(x)*amplitude)+(height/2));
-    x += dx;
-  }
-  return yVal;
-}
-
-function lamby(height, width, thick) {
-  let out = "";
-  let yvals = coss(height, width, Math.PI);
-  let halfWidth = width/2;
-
-  for(let y=0;y<height;y++){
-    for(let x=0;x<width;x++){
-      let posy = yvals[x];
-      let negy = height-posy;
-      if (Math.abs(posy-y) < thick) {
-        out += "<span style=\"color: hsl("+ (Math.abs(posy-y)/thick*260) +",100%, 50%)\">&lambda;</span>";
-      } else if ((x < halfWidth) && (Math.abs(negy-y) < thick)) {
-        out += "<span style=\"color: hsl("+ (Math.abs(negy-y)/thick*260) +",100%, 50%)\">&lambda;</span>";
-      } else {
-        out += " ";
-      }
-    }
-    out += "\n";
-  }
-  return out;
-}
-
-function putlam(el, height, width, min, max, period) {
-  let amp = max-min;
-  const f = function() {
-    let percent = (Math.sin(((new Date).getTime()/period)) + 1) / 2;
-    let thick = (amp * percent) + min;
-    el.innerHTML = lamby(height, width, thick);
-  };
-  window.setInterval(f, 100);
-}
-
-let lamEl = document.querySelector('.lambda');
-putlam(lamEl, 45, 45, 0.3, 4.5, 450);
-
-
-`
-00
-  0
-   0
-  0 0
- 0   0
-0     00
-
-0
- 0
-0 0
-
-_
-  \
-   \
-   /\
-  /  \
- /    \
-/      \_
-`;
-- 
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