shorten random function

[rbdr/r.bdr.sh] / js / animation.js

diff --git a/js/animation.js b/js/animation.js
index fc6246ec2d6e914cd6e649909b33aca52816263a..3f44cd81ac8ce48e63d527da7b4ca22a1eb944ef 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,142 +1,136 @@
 (function () {
 
 (function () {
 

-  var canvas = document.querySelector('canvas'),
-      context = canvas.getContext('2d'),
-      fps = 30,
-      lastFrame = 0,
-      speed = 1,
-      size = 5 + rand(10);
-
-  var clear = !!(Math.random() > 0.5);
-  var changeColor = !!(Math.random() > 0.5);
-  var items = Array(rand(10) + 6).fill(null).map(() => ({
-    x: rand(64),
-    y: rand(64),
-    angle: Math.random() * 2 * Math.PI,
-    color: Array(3).fill(rand(256))
-  }));
-  var shapes = [square, circle, heart, chaos, lineChaos];
-  var positions = [identity, spin(5), spin(15)];
-  var draw = shapes[rand(shapes.length)];
-  var position = positions[rand(positions.length)];
-
-  function rand (x) {
-    return Math.floor(Math.random() * x);
+  var K = document.querySelector('canvas'),
+      { random: R, PI, cos, sin, floor, atan2 } = Math,
+      ctx = K.getContext('2d'),
+      fps = 24,
+      lst = 0,
+      spd = 1,
+      siz = 5 + r(10),
+      clr = R() > 0.5,
+      ccl = R() > 0.5,
+      I = Array(r(10) + 6).fill(null).map(() => ({
+        x: r(64),
+        y: r(64),
+        a: R() * 2 * PI,
+        c: Array(3).fill(r(256))
+      })),
+      SHP = [sqr, crc, hrt, chs, lch],
+      POS = [id, spn(5), spn(15)],
+      draw = SHP[r(SHP.length)],
+      pos = POS[r(POS.length)];
+
+  function r(x) {
+    return floor(R() * x);

   }
 
   }
 

-  function square(item) {
+  function sqr(i) {

 
 

-    var p = position(item);
-    context.fillRect(p.x, p.y, size, size);
+    var p = pos(i);
+    ctx.fillRect(p.x, p.y, siz, siz);

   }
 
   }
 

-  function circle(item) {
+  function crc(i) {

 
 

-    var p = position(item);
-    context.beginPath();
-    context.arc(p.x, p.y, size / 2, 0, 2 * Math.PI);
-    context.fill();
+    var p = pos(i);
+    ctx.beginPath();
+    ctx.arc(p.x, p.y, siz / 2, 0, 2 * PI);
+    ctx.fill();

   }
 
   }
 

-  function chaos(item) {
+  function chs(i) {

 
 

-    var p = position(item);
-    context.beginPath();
-    context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * Math.cos(item.angle), p.y * 10 * Math.sin(item.angle));
-    context.lineTo(rand(64), rand(64));
-    context.fill();
+    var p = pos(i);
+    ctx.beginPath();
+    ctx.moveTo(p.x, p.y);
+    ctx.lineTo(p.x * 10 * cos(i.a), p.y * 10 * sin(i.a));
+    ctx.lineTo(r(64), r(64));
+    ctx.fill();

   }
 
   }
 

-  function lineChaos(item) {
+  function lch(i) {

 
 

-    var p = position(item);
-    context.beginPath();
-    context.lineWidth = 5;
-    context.strokeStyle = `rgb(${item.color.join(',')})`;
-    context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * Math.cos(item.angle), p.y * 10 * Math.sin(item.angle));
-    context.stroke();
+    var p = pos(i);
+    ctx.beginPath();
+    ctx.lineWidth = 5;
+    ctx.strokeStyle = `rgb(${i.c.join(',')})`;
+    ctx.moveTo(p.x, p.y);
+    ctx.lineTo(p.x * 10 * cos(i.a), p.y * 10 * sin(i.a));
+    ctx.stroke();

   }
 
   }
 

-  function square(item) {
+  function hrt(i) {

 
 

-    var p = position(item);
-    context.fillRect(p.x, p.y, size, size);
-  }
-
-  function heart(item) {
-
-    var p = position(item);
-    context.fillRect(p.x, p.y, size, size);
+    var p = pos(i);
+    ctx.fillRect(p.x, p.y, siz, siz);

 
 

-    context.beginPath();
-    context.arc(p.x + size / 2, p.y, size / 2, 0, 2 * Math.PI, false);
-    context.fill();
-    context.closePath();
+    ctx.beginPath();
+    ctx.arc(p.x + siz / 2, p.y, siz / 2, 0, 2 * PI, false);
+    ctx.fill();
+    ctx.closePath();

 
 

-    context.beginPath();
-    context.arc(p.x + size, p.y + size / 2, size / 2, 0, 2 * Math.PI, false);
-    context.fill();
-    context.closePath();
+    ctx.beginPath();
+    ctx.arc(p.x + siz, p.y + siz / 2, siz / 2, 0, 2 * PI, false);
+    ctx.fill();
+    ctx.closePath();

   }
 
   }
 

-  function identity(position) {
+  function id(p) {

 
 

-    return position;
+    return p;

   }
 
   }
 

-  function spin(radius) {
-    return function (position) {
+  function spn(rad) {
+    return function (p) {

 
       return {
 
       return {

-        x: position.x + radius * Math.cos(lastFrame),
-        y: position.y + radius * Math.sin(lastFrame)
+        x: p.x + rad * cos(lst),
+        y: p.y + rad * sin(lst)

       }
     }
   }
 
       }
     }
   }
 

-  function move(item) {
+  function mov(i) {

 
 

-    item.x = item.x + speed * Math.cos(item.angle);
-    item.y = item.y + speed * Math.sin(item.angle);
+    i.x = i.x + spd * cos(i.a);
+    i.y = i.y + spd * sin(i.a);

 
 

-    if (item.x < 0 || item.x > 64) {
-      item.angle = Math.atan2(Math.sin(item.angle), -Math.cos(item.angle))
+    if (i.x < 0 || i.x > 64) {
+      i.a = atan2(sin(i.a), -cos(i.a))

     }
 
     }
 

-    if (item.y < 0 || item.y > 64) {
-      item.angle = Math.atan2(-Math.sin(item.angle), Math.cos(item.angle))
+    if (i.y < 0 || i.y > 64) {
+      i.a = atan2(-sin(i.a), cos(i.a))

     }
   }
 
     }
   }
 

-  function updateColor(item) {
+  function ucl(i) {

 
 

-    item.color = item.color.map((c) => {
+    i.c = i.c.map((c) => {

       c = c + 5;
       return c > 255 ? 0 : c;
     })
   }
 
       c = c + 5;
       return c > 255 ? 0 : c;
     })
   }
 

-  function frame(time) {
+  function frm(t) {

 
 

-    window.requestAnimationFrame(frame);
+    window.requestAnimationFrame(frm);

 
 

-    var delta = time - lastFrame;
+    var dt = t - lst;

 
 

-    if (delta > 1000 / fps) {
-      clear && context.clearRect(0, 0, 64, 64);
-      for (var item of items) {
-        context.fillStyle = `rgb(${item.color.join(',')})`;
-        draw(item);
-        changeColor && updateColor(item);
-        move(item);
+    if (dt > 1000 / fps) {
+      clr && ctx.clearRect(0, 0, 64, 64);
+      for (var i of I) {
+        ctx.fillStyle = `rgb(${i.c.join(',')})`;
+        draw(i);
+        ccl && ucl(i);
+        mov(i);

       }
 
       }
 

-      lastFrame = time;
+      lst = t;

     }
   }
 
     }
   }
 

-  frame();
+  frm();

 }
 )();
 }
 )();