X-Git-Url: https://git.r.bdr.sh/rbdr/r.bdr.sh/blobdiff_plain/05a804d01b1fb83de89170c77799d1a43da925b1..434d5b4511f5528c644efa97827fa982c583f96b:/js/animation.js

diff --git a/js/animation.js b/js/animation.js
index 65ee4bd..df1673e 100644
--- a/js/animation.js
+++ b/js/animation.js
@@ -1,142 +1,97 @@
 (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(100),
-    y: rand(100),
-    angle: Math.random() * 2 * Math.PI,
-    color: Array(3).fill(null).map(() => 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);
-  }
-
-  function square(item) {
-
-    var p = position(item);
-    context.fillRect(p.x, p.y, size, size);
-  }
-
-  function circle(item) {
-
-    var p = position(item);
-    context.beginPath();
-    context.arc(p.x, p.y, size / 2, 0, 2 * Math.PI);
-    context.fill();
-  }
-
-  function chaos(item) {
-
-    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(100), rand(100));
-    context.fill();
-  }
-
-  function lineChaos(item) {
-
-    var p = position(item);
-    context.beginPath();
-    context.lineWidth = 5;
-    context.strokeStyle = `rgb(${item.color.join(',')})`;
-    context.moveTo(p.x, p.y);
-    context.lineTo(p.x * 10 * Math.cos(item.angle), p.y * 10 * Math.sin(item.angle));
-    context.stroke();
-  }
-
-  function square(item) {
-
-    var p = position(item);
-    context.fillRect(p.x, p.y, size, size);
-  }
-
-  function heart(item) {
-
-    var p = position(item);
-    context.fillRect(p.x, p.y, size, size);
-
-    context.beginPath();
-    context.arc(p.x + size / 2, p.y, size / 2, 0, 2 * Math.PI, false);
-    context.fill();
-    context.closePath();
-
-    context.beginPath();
-    context.arc(p.x + size, p.y + size / 2, size / 2, 0, 2 * Math.PI, false);
-    context.fill();
-    context.closePath();
-  }
-
-  function identity(position) {
+if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) return
+
+var K=document.querySelector('canvas'),
+{random:R,PI,cos:C,sin:S,atan2:A} = Math,
+id = p => p,
+spn = r => p => ({
+    x: p.x + r * C(l),
+    y: p.y + r * S(l)
+}),
+X = K.getContext('2d'), F = X.fill.bind(X), B = X.beginPath.bind(X),
+f = 24, l = 0, s = 1, z = 5 + r(10),
+k = R() > 0.5, c = R() > 0.5,
+I = Array(r(10) + 6).fill().map(() => ({
+  x: r(64), y: r(64),
+  a: R() * 2 * PI, c: r(100)
+})),
+H = [sqr, crc, hrt, chs, lch], P = [id, spn(5), spn(15)],
+dr = H[r(H.length)], pos = P[r(P.length)],
+Z = 1
+
+function r(x) {
+  return ~~(R() * x)
+}
+function sqr(i) {
+  var p = pos(i)
+  X.fillRect(p.x, p.y, z, z)
+}
+function crc(i) {
+  var p = pos(i)
+  B()
+  X.arc(p.x, p.y, z / 2, 0, 2 * PI)
+  F()
+}
+function chs(i) {
+  var {x, y} = pos(i)
+  B()
+  X.moveTo(x, y)
+  X.lineTo(x * 10 * C(i.a), y * 10 * S(i.a))
+  X.lineTo(r(64), r(64))
+  F()
+}
+function lch(i) {
+  var {x, y} = pos(i)
+  B()
+  X.lineWidth = 5
+  X.strokeStyle = `hsl(0,0%,${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 position;
+  if (i.x < 0 || i.x > 64) {
+    i.a = A(S(i.a), -C(i.a))
   }
-
-  function spin(radius) {
-    return function (position) {
-
-      return {
-        x: position.x + radius * Math.cos(lastFrame),
-        y: position.y + radius * Math.sin(lastFrame)
-      }
-    }
+  if (i.y < 0 || i.y > 64) {
+    i.a = A(-S(i.a), C(i.a))
   }
-
-  function move(item) {
-
-    item.x = item.x + speed * Math.cos(item.angle);
-    item.y = item.y + speed * Math.sin(item.angle);
-
-    if (item.x < 0 || item.x > 100) {
-      item.angle = Math.atan2(Math.sin(item.angle), -Math.cos(item.angle))
-    }
-
-    if (item.y < 0 || item.y > 100) {
-      item.angle = Math.atan2(-Math.sin(item.angle), Math.cos(item.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(item) {
-
-    item.color = item.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, 100, 100);
-      for (var item of items) {
-        context.fillStyle = `rgb(${item.color.join(',')})`;
-        draw(item);
-        changeColor && updateColor(item);
-        move(item);
-      }
-
-      lastFrame = time;
-    }
+    l = t
   }
-
-  frame();
 }
-)();
+
+K.addEventListener('click', () => ((Z=Z?0:1)&&frm()))
+frm()
+})()