add star field generator

geometor · Nov 15, 2020 · 34b7af8 · 34b7af8
1 parent 220a370
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diff --git a/stars/README.markdown b/stars/README.markdown
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+# Stars
+ _A Pen created at CodePen.io. Original URL: [https://codepen.io/i-am-phi/pen/gObbVKp](https://codepen.io/i-am-phi/pen/gObbVKp).
+
+ See also: <a href="http://codepen.io/giana/pen/bEGxoe">Galaxy</a>
+
+Edit: Big thanks to @lightest and @jackrugile for the performance boost.
+
+I'm getting super laggy performance on Firefox even with a low (50-100) number of particles and bad flickering on Chrome. Any ideas what it could be?
+
+Edit: I mean. That flickering is totally intentional. Because they're stars. And stars appear to flicker.
diff --git a/stars/index.html b/stars/index.html
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+<!DOCTYPE html>
+<html lang="en" >
+<head>
+  <meta charset="UTF-8">
+  <title>Stars</title>
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css">
+<link rel="stylesheet" href="./style.css">
+
+</head>
+<body>
+<!-- partial:index.partial.html -->
+<canvas id="canvas"></canvas>
+<!-- partial -->
+  <script  src="./script.js"></script>
+
+</body>
+</html>
diff --git a/stars/license.txt b/stars/license.txt
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+Copyright (c) 2019 by phi (https://codepen.io/i-am-phi/pen/gObbVKp)
+Fork of an original work Stars (https://codepen.io/giana/pen/qbWNYy
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
diff --git a/stars/script.js b/stars/script.js
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+"use strict";
+
+var canvas = document.getElementById('canvas'),
+  ctx = canvas.getContext('2d'),
+  w = canvas.width = window.innerWidth,
+  h = canvas.height = window.innerHeight,
+
+  hue = 217,
+  stars = [],
+  count = 0,
+  maxStars = 1400;
+
+// Thanks @jackrugile for the performance tip! https://codepen.io/jackrugile/pen/BjBGoM
+// Cache gradient
+var canvas2 = document.createElement('canvas'),
+    ctx2 = canvas2.getContext('2d');
+    canvas2.width = 100;
+    canvas2.height = 100;
+var half = canvas2.width/2,
+    gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
+    gradient2.addColorStop(0.025, '#fff');
+    gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
+    gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
+    gradient2.addColorStop(1, 'transparent');
+
+    ctx2.fillStyle = gradient2;
+    ctx2.beginPath();
+    ctx2.arc(half, half, half, 0, Math.PI * 2);
+    ctx2.fill();
+
+// End cache
+
+function random(min, max) {
+  if (arguments.length < 2) {
+    max = min;
+    min = 0;
+  }
+
+  if (min > max) {
+    var hold = max;
+    max = min;
+    min = hold;
+  }
+
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+function maxOrbit(x,y) {
+  var max = Math.max(x,y),
+      diameter = Math.round(Math.sqrt(max*max + max*max));
+  return diameter/2;
+}
+
+var Star = function() {
+
+  this.orbitRadius = random(maxOrbit(w,h));
+  this.radius = random(60, this.orbitRadius) / 12;
+  this.orbitX = w / 2;
+  this.orbitY = h / 2;
+  this.timePassed = random(0, maxStars);
+  this.speed = random(this.orbitRadius) / 50000;
+  this.alpha = random(2, 10) / 10;
+
+  count++;
+  stars[count] = this;
+}
+
+Star.prototype.draw = function() {
+  var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
+      y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
+      twinkle = random(10);
+
+  if (twinkle === 1 && this.alpha > 0) {
+    this.alpha -= 0.05;
+  } else if (twinkle === 2 && this.alpha < 1) {
+    this.alpha += 0.05;
+  }
+
+  ctx.globalAlpha = this.alpha;
+    ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
+  this.timePassed += this.speed;
+}
+
+for (var i = 0; i < maxStars; i++) {
+  new Star();
+}
+
+function animation() {
+    ctx.globalCompositeOperation = 'source-over';
+    ctx.globalAlpha = 0.8;
+    ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 1)';
+    ctx.fillRect(0, 0, w, h)
+
+  ctx.globalCompositeOperation = 'lighter';
+  for (var i = 1, l = stars.length; i < l; i++) {
+    stars[i].draw();
+  };  
+
+  window.requestAnimationFrame(animation);
+}
+
+animation();
diff --git a/stars/src/index.html b/stars/src/index.html
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+<canvas id="canvas"></canvas>
diff --git a/stars/src/script.js b/stars/src/script.js
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+"use strict";
+
+var canvas = document.getElementById('canvas'),
+  ctx = canvas.getContext('2d'),
+  w = canvas.width = window.innerWidth,
+  h = canvas.height = window.innerHeight,
+
+  hue = 217,
+  stars = [],
+  count = 0,
+  maxStars = 1400;
+
+// Thanks @jackrugile for the performance tip! https://codepen.io/jackrugile/pen/BjBGoM
+// Cache gradient
+var canvas2 = document.createElement('canvas'),
+    ctx2 = canvas2.getContext('2d');
+    canvas2.width = 100;
+    canvas2.height = 100;
+var half = canvas2.width/2,
+    gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
+    gradient2.addColorStop(0.025, '#fff');
+    gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
+    gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
+    gradient2.addColorStop(1, 'transparent');
+
+    ctx2.fillStyle = gradient2;
+    ctx2.beginPath();
+    ctx2.arc(half, half, half, 0, Math.PI * 2);
+    ctx2.fill();
+
+// End cache
+
+function random(min, max) {
+  if (arguments.length < 2) {
+    max = min;
+    min = 0;
+  }
+
+  if (min > max) {
+    var hold = max;
+    max = min;
+    min = hold;
+  }
+
+  return Math.floor(Math.random() * (max - min + 1)) + min;
+}
+
+function maxOrbit(x,y) {
+  var max = Math.max(x,y),
+      diameter = Math.round(Math.sqrt(max*max + max*max));
+  return diameter/2;
+}
+
+var Star = function() {
+
+  this.orbitRadius = random(maxOrbit(w,h));
+  this.radius = random(60, this.orbitRadius) / 12;
+  this.orbitX = w / 2;
+  this.orbitY = h / 2;
+  this.timePassed = random(0, maxStars);
+  this.speed = random(this.orbitRadius) / 50000;
+  this.alpha = random(2, 10) / 10;
+
+  count++;
+  stars[count] = this;
+}
+
+Star.prototype.draw = function() {
+  var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
+      y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
+      twinkle = random(10);
+
+  if (twinkle === 1 && this.alpha > 0) {
+    this.alpha -= 0.05;
+  } else if (twinkle === 2 && this.alpha < 1) {
+    this.alpha += 0.05;
+  }
+
+  ctx.globalAlpha = this.alpha;
+    ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
+  this.timePassed += this.speed;
+}
+
+for (var i = 0; i < maxStars; i++) {
+  new Star();
+}
+
+function animation() {
+    ctx.globalCompositeOperation = 'source-over';
+    ctx.globalAlpha = 0.8;
+    ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 1)';
+    ctx.fillRect(0, 0, w, h)
+
+  ctx.globalCompositeOperation = 'lighter';
+  for (var i = 1, l = stars.length; i < l; i++) {
+    stars[i].draw();
+  };  
+
+  window.requestAnimationFrame(animation);
+}
+
+animation();
diff --git a/stars/src/style.scss b/stars/src/style.scss
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+body {
+  background: #060e1b;
+  overflow: hidden;
+}
+
+canvas {
+  //opacity: 0.5;
+}
diff --git a/stars/style.css b/stars/style.css
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+body {
+  background: #060e1b;
+  overflow: hidden;
+}
diff --git a/stars/video/stars.20201115-13:13:23.mp4 b/stars/video/stars.20201115-13:13:23.mp4