Add braille

1 files changed, 70 insertions, 0 deletions

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
+
+_
+  \
+   \
+   /\
+  /  \
+ /    \
+/      \_
+`;