Update files from notes

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

diff --git a/js/animation.js b/js/animation.js
index b579fea1e0b197006ba05fc1bb9ea0dddf35cce0..df1673e1a226faff20791df83cf22749fabe0ef8 100644 (file)
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,145 +1,97 @@
 (function () {
 
 (function () {
 

-  var canvas = document.querySelector('canvas'),
-      r = Math.random,
-      pi = Math.PI,
-      cos = Math.cos,
-      sin = Math.sin,
-      context = canvas.getContext('2d'),
-      fps = 24,
-      lastFrame = 0,
-      speed = 1,
-      size = 5 + rnd(10),
-      clear = !!(r() > 0.5),
-      changeColor = !!(r() > 0.5),
-      items = Array(rnd(10) + 6).fill(null).map(() => ({
-        x: rnd(64),
-        y: rnd(64),
-        angle: r() * 2 * pi,
-        color: Array(3).fill(rnd(256))
-      })),
-      shapes = [sqr, crc, hrt, chs, lch],
-      positions = [id, spn(5), spn(15)],
-      draw = shapes[rnd(shapes.length)],
-      pos = positions[rnd(positions.length)];
-
-  function rnd (x) {
-    return Math.floor(r() * x);
-  }
-
-  function sqr(i) {
-
-    var p = pos(i);
-    context.fillRect(p.x, p.y, size, size);
-  }
-
-  function crc(i) {
-
-    var p = pos(i);
-    context.beginPath();
-    context.arc(p.x, p.y, size / 2, 0, 2 * pi);
-    context.fill();
-  }
-
-  function chs(i) {
-
-    var p = pos(i);
-    context.beginPath();
-    context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * cos(i.angle), p.y * 10 * sin(i.angle));
-    context.lineTo(rnd(64), rnd(64));
-    context.fill();
-  }
-
-  function lch(i) {
-
-    var p = pos(i);
-    context.beginPath();
-    context.lineWidth = 5;
-    context.strokeStyle = `rgb(${i.color.join(',')})`;
-    context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * cos(i.angle), p.y * 10 * sin(i.angle));
-    context.stroke();
-  }
-
-  function sqr(i) {
-
-    var p = pos(i);
-    context.fillRect(p.x, p.y, size, size);
-  }
-
-  function hrt(i) {
-
-    var p = pos(i);
-    context.fillRect(p.x, p.y, size, size);
-
-    context.beginPath();
-    context.arc(p.x + size / 2, p.y, size / 2, 0, 2 * pi, false);
-    context.fill();
-    context.closePath();
-
-    context.beginPath();
-    context.arc(p.x + size, p.y + size / 2, size / 2, 0, 2 * pi, false);
-    context.fill();
-    context.closePath();
-  }
-
-  function id(p) {
+if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return
+
+var K=document.querySelector('canvas'),
+{random:R,PI,cos:C,sin:S,atan2:A} = Math,
+id = p => p,
+spn = r => p => ({
+    x: p.x + r * C(l),
+    y: p.y + r * S(l)
+}),
+X = K.getContext('2d'), F = X.fill.bind(X), B = X.beginPath.bind(X),
+f = 24, l = 0, s = 1, z = 5 + r(10),
+k = R() > 0.5, c = R() > 0.5,
+I = Array(r(10) + 6).fill().map(() => ({
+  x: r(64), y: r(64),
+  a: R() * 2 * PI, c: r(100)
+})),
+H = [sqr, crc, hrt, chs, lch], P = [id, spn(5), spn(15)],
+dr = H[r(H.length)], pos = P[r(P.length)],
+Z = 1
+
+function r(x) {
+  return ~~(R() * x)
+}
+function sqr(i) {
+  var p = pos(i)
+  X.fillRect(p.x, p.y, z, z)
+}
+function crc(i) {
+  var p = pos(i)
+  B()
+  X.arc(p.x, p.y, z / 2, 0, 2 * PI)
+  F()
+}
+function chs(i) {
+  var {x, y} = pos(i)
+  B()
+  X.moveTo(x, y)
+  X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
+  X.lineTo(r(64), r(64))
+  F()
+}
+function lch(i) {
+  var {x, y} = pos(i)
+  B()
+  X.lineWidth = 5
+  X.strokeStyle = `hsl(0,0%,${i.c}%)`
+  X.moveTo(x, y)
+  X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
+  X.stroke()
+}
+function hrt(i) {
+  var {x, y} = pos(i)
+  X.fillRect(x, y, z, z)
+
+  B()
+  X.arc(x + z / 2, y, z / 2, 0, 2 * PI, false)
+  F()
+  X.closePath()
+
+  B()
+  X.arc(x + z, y + z / 2, z / 2, 0, 2 * PI, false)
+  F()
+  X.closePath()
+}
+function mv(i) {
+  i.x = i.x + s * C(i.a)
+  i.y = i.y + s * S(i.a)

 
 

-    return p;
+  if (i.x < 0 || i.x > 64) {
+    i.a = A(S(i.a), -C(i.a))

   }
   }

-
-  function spn(rad) {
-    return function (p) {
-
-      return {
-        x: p.x + rad * cos(lastFrame),
-        y: p.y + rad * sin(lastFrame)
-      }
-    }
+  if (i.y < 0 || i.y > 64) {
+    i.a = A(-S(i.a), C(i.a))

   }
   }

-
-  function mov(i) {
-
-    i.x = i.x + speed * cos(i.angle);
-    i.y = i.y + speed * sin(i.angle);
-
-    if (i.x < 0 || i.x > 64) {
-      i.angle = Math.atan2(sin(i.angle), -cos(i.angle))
-    }
-
-    if (i.y < 0 || i.y > 64) {
-      i.angle = Math.atan2(-sin(i.angle), cos(i.angle))
+}
+function ucl(i) {i.c = (i.c + 2) % 101}
+function frm(t) {
+  if (Z) requestAnimationFrame(frm)
+  var dt = t - l
+  if (dt > 1000 / f) {
+    k && X.clearRect(0, 0, 64, 64)
+    for (var i of I) {
+      X.fillStyle = `hsl(0,0%,${i.c}%)`
+      dr(i)
+      c && ucl(i)
+      mv(i)

     }
     }

-  }
-
-  function updateColor(i) {
-
-    i.color = i.color.map((c) => {
-      c = c + 5;
-      return c > 255 ? 0 : c;
-    })
-  }
-
-  function frame(time) {

 
 

-    window.requestAnimationFrame(frame);
-
-    var delta = time - lastFrame;
-
-    if (delta > 1000 / fps) {
-      clear && context.clearRect(0, 0, 64, 64);
-      for (var i of items) {
-        context.fillStyle = `rgb(${i.color.join(',')})`;
-        draw(i);
-        changeColor && updateColor(i);
-        mov(i);
-      }
-
-      lastFrame = time;
-    }
+    l = t

   }
   }

-
-  frame();

 }
 }

-)();
+
+K.addEventListener('click', () => ((Z=Z?0:1)&&frm()))
+frm()
+})()