Orbital-trails: copied code from project
This commit is contained in:
Greg Shuflin
parent
40528934c5
commit
96a2f40524
@ -9,6 +9,7 @@
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<ul>
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<li> <a href="./konva-ball/index.html">Konva-ball</a>
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<li> <a href="./flow-fields/index.html">Flow-fields</a>
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<li> <a href="./orbital-trails/index.html">Orbital Trails</a>
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</ul>
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</body>
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</html>
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137
src/orbital-trails/app.js
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137
src/orbital-trails/app.js
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window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)}}();
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document.onselectstart = function() {
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return false;
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};
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var c = document.getElementById('c');
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var ctx = c.getContext('2d');
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var dpr = window.devicePixelRatio;
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var cw = window.innerWidth;
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var ch = window.innerHeight;
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c.width = cw * dpr;
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c.height = ch * dpr;
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ctx.scale(dpr, dpr);
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var rand = function(rMi, rMa){return ~~((Math.random()*(rMa-rMi+1))+rMi);}
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ctx.lineCap = 'round';
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var orbs = [];
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var orbCount = 30;
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var radius;
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var trailCB = document.getElementById('trail');
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var trail = trailCB.checked;
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var clearer = document.getElementById('clear');
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function createOrb(mx,my){
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var dx = (cw/2) - mx;
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var dy = (ch/2) - my;
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var dist = Math.sqrt(dx * dx + dy * dy);
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var angle = Math.atan2(dy, dx);
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orbs.push({
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x: mx,
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y: my,
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lastX: mx,
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lastY: my,
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hue: 0,
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colorAngle: 0,
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angle: angle + Math.PI/2,
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//size: .5+dist/250,
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size: rand(1,3)/2,
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centerX: cw/2,
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centerY: ch/2,
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radius: dist,
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speed: (rand(5,10)/1000)*(dist/750)+.015,
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alpha: 1 - Math.abs(dist)/cw,
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draw: function() {
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ctx.strokeStyle = 'hsla('+this.colorAngle+',100%,50%,1)';
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ctx.lineWidth = this.size;
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ctx.beginPath();
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ctx.moveTo(this.lastX, this.lastY);
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ctx.lineTo(this.x, this.y);
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ctx.stroke();
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},
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update: function(){
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var mx = this.x;
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var my = this.y;
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this.lastX = this.x;
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this.lastY = this.y;
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var x1 = cw/2;
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var y1 = ch/2;
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var x2 = mx;
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var y2 = my;
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var rise = y1-y2;
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var run = x1-x2;
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var slope = -(rise/run);
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var radian = Math.atan(slope);
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var angleH = Math.floor(radian*(180/Math.PI));
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if(x2 < x1 && y2 < y1){angleH += 180;}
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if(x2 < x1 && y2 > y1){angleH += 180;}
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if(x2 > x1 && y2 > y1){angleH += 360;}
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if(y2 < y1 && slope =='-Infinity'){angleH = 90;}
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if(y2 > y1 && slope =='Infinity'){angleH = 270;}
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if(x2 < x1 && slope =='0'){angleH = 180;}
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if(isNaN(angleH)){angleH = 0;}
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this.colorAngle = angleH;
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this.x = this.centerX + Math.sin(this.angle*-1) * this.radius;
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this.y = this.centerY + Math.cos(this.angle*-1) * this.radius;
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this.angle += this.speed;
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}
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});
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}
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function orbGo(e){
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var mx = e.pageX - c.offsetLeft;
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var my = e.pageY - c.offsetTop;
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createOrb(mx,my);
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}
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function turnOnMove(){
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c.addEventListener('mousemove', orbGo, false);
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}
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function turnOffMove(){
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c.removeEventListener('mousemove', orbGo, false);
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}
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function toggleTrails(){
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trail = trailCB.checked;
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}
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function clear(){
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orbs = [];
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}
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c.addEventListener('mousedown', orbGo, false);
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c.addEventListener('mousedown', turnOnMove, false);
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c.addEventListener('mouseup', turnOffMove, false);
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trailCB.addEventListener('change', toggleTrails, false);
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clearer.addEventListener('click', clear, false);
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var count = 100;
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while(count--){
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createOrb(cw/2, ch/2+(count*2));
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}
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var loop = function(){
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window.requestAnimFrame(loop);
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if(trail){
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ctx.fillStyle = 'rgba(0,0,0,.1)';
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ctx.fillRect(0,0,cw,ch);
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} else {
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ctx.clearRect(0,0,cw,ch);
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}
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var i = orbs.length;
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while(i--){
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var orb = orbs[i];
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var updateCount = 3;
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while(updateCount--){
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orb.update();
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orb.draw(ctx);
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}
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}
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}
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loop();
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22
src/orbital-trails/index.html
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22
src/orbital-trails/index.html
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@ -0,0 +1,22 @@
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8"/>
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<title>Orbital Trails</title>
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<link href="style.css" rel="stylesheet" />
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<script type="module" src="app.js"></script>
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</head>
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<body>
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<div id="control-panel">
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<p>Click and drag to make more!</p>
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<label>Trails: </label>
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<input type="checkbox" id="trail" name="trail" checked />
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<button id="clear">Clear</button>
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<a href="https://codepen.io/jackrugile/pen/aCzHs" target="_blank">View Version 2</a>
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</div>
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<canvas id="c"></canvas>
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</body>
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</html>
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48
src/orbital-trails/style.css
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48
src/orbital-trails/style.css
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@ -0,0 +1,48 @@
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body {
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background: #000;
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color: #aaa;
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font: 100%/20px helvetica, arial, sans-serif;
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}
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canvas {
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display: block;
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height: 100%;
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left: 0;
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margin: 0;
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padding: 0;
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position: absolute;
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top: 0;
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width: 100%
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}
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#control-panel {
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background: rgba(0,0,0,.75);
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border: 1px solid #333;
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left: 20px;
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padding: 10px 15px;
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position: absolute;
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top: 20px;
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z-index: 2;
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}
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p {
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font-size: 12px;
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margin: 0 0 5px;
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}
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label {
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font-size: 12px;
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font-weight: bold;
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}
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button {
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display: block;
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margin: 10px 0 5px;
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}
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a {
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border-bottom: 1px dotted #444;
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color: #fff;
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font-size: 12px;
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text-decoration: none;
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}
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