Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

              
                <canvas></canvas>
              
            
!

CSS

              
                @import "compass/css3";

*{background:#000;}
html, body, canvas{width:100%;height:100%;overflow:hidden;}
              
            
!

JS

              
                var numpts = 300;
    var speed = 0.03;
    var spin = 3;
    var space = 10;
    var ctx, blurf=0.3,
    blur=false, 
    gravity=9.8, 
    color=320, 
    ttl=10, 
    bounce=0.7, 
    pt, pt1, pt2, 
    z = 200, 
    dist = 1000, points = [], mouse=false, ry=0;
    var xvel = 25, yvel = 50, zvel = 25, lastx, lasty;
    var last = new Date().getTime();
    
    var plane = new Quad(0,25,0,40,40);
    function Quad(cx, cy, cz, l, w) {
        this.cx = cx || 0;
        this.cy = cy || 0;
        this.cz = cz || 0;
        this.length = l || 1;
        this.width = w || 1;
        this.color = "#fff";
        this.verts = [
            new Point(cx+w/2, cy, cz+l/2),
            new Point(cx-w/2, cy, cz+l/2),
            new Point(cx-w/2, cy, cz-l/2),
            new Point(cx+w/2, cy, cz-l/2),
        ];
    }
    Quad.prototype.draw = function() {
        for(var i = 0; i < plane.verts.length-1;i++) {
            pt1 = process( plane.verts[i] );
            pt2 = process( plane.verts[i+1] );
            drawLine(pt1.x, pt1.y, pt2.x, pt2.y, this.color);
        } 
        pt1 = process( plane.verts[0] );
        drawLine(pt2.x, pt2.y, pt1.x, pt1.y, this.color);
    };
    function Point(x,y,z,scale, color, alpha, vel) {
        this.x = x || 1;
        this.y = y || 0;
        this.z = z || 1.001;
        this.scale = scale || 1;
        this.alpha = alpha || 1.0;
        this.color = color || "#fff";
        this.vel = vel || [0,0,0];
        this.ttl = Math.random()*ttl + 1;
        this.sttl = this.ttl;
    }
    
    function render() {
        if(!blur) {
            ctx.clearRect(0, 0, ctx.canvas.width, ctx.canvas.height);
        } else {
            ctx.fillStyle = 'rgba(0,0,0,'+blurf+')';
            ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
        }

        plane.draw();
        
        for(var i = 0; i < points.length;i++) {
            pt = process(points[i]);
            drawCircle(pt.x, pt.y, points[i].scale*pt.scale, 1, points[i].color);
        }
        
        animate();
        requestAnimFrame(render);
    }
    function animate() {
        var time = new Date().getTime();
        var t = (time - last) / 1000;
        t = t > 0.3 ? 0.3 : t; // HACK - clamp time so it doesnt go haywire when last grows large cus render stops
        for(var i = 0; i < points.length;i++) {
            
            points[i].ttl -= t;
            points[i].x += points[i].vel[0] * t;
            points[i].y += points[i].vel[1] * t;
            points[i].z += points[i].vel[2] * t;
            points[i].vel[1] += gravity;
            points[i].scale = (points[i].ttl/points[i].sttl);
            points[i].color = "hsla("+(color+(points[i].ttl/points[i].sttl)*30)+",100%, "+(points[i].ttl/points[i].sttl)*100+"%,1.0)";
            
            if(points[i].ttl < 0) {
                points.splice(i,1);
                points.push( createpoint() );
            }
            
            if((points[i].y+points[i].scale/2) >= plane.cy) {
                points[i].vel[1] = -points[i].vel[1] * bounce + gravity*1.25; // + grav, keeps them from bouncing forever
                points[i].y = plane.cy-(points[i].scale/2);
            }
        }
        
        last = time;
    }
    function drawCircle(x, y, r, w, color) {
        ctx.fillStyle = color;
		ctx.lineWidth = w;
		ctx.beginPath(); 
        ctx.arc(x, y, (r>0?r:0), 0, Math.PI*2);
        ctx.fill();
	}
    function drawLine(sx,sy, x, y, color) {
		ctx.strokeStyle = color;
		ctx.beginPath(); 
        ctx.moveTo(sx,sy); 
        ctx.lineTo(x, y);
		ctx.stroke();
	}
    
    function process(pt) {
        var p = rotate(pt);
        return project(p);
    }
    function rotate(pt) {
        var p = sCopy(pt);
        p.x = (pt.x)*Math.cos(ry)-(pt.z)*Math.sin(ry);
        p.z = (pt.x)*Math.sin(ry)+(pt.z)*Math.cos(ry) + z;
        p.scale = pt.scale;
        return p;
    }
    function project(pt) {
        var p = sCopy(pt);
        p.x = ctx.canvas.width/2  + (pt.x * (dist/pt.z));
        p.y = ctx.canvas.height/2 + (pt.y * (dist/pt.z));
        p.scale = (dist/pt.z);
        return p;
	}
    
    function init() {
        points = [];
        for(var i = 0; i < numpts;i++){ 
            points.push( createpoint() ); 
            points[i].ttl = 0;
        }
    }
    function createpoint() {
        return new Point(
                Math.random()*2-1,
                Math.random()*2-1,
                Math.random()*2-1,
                undefined, //Math.random()+0.1, 
                "#f0f",
                .5,
                [Math.random()*xvel-xvel/2, Math.random()*-yvel, Math.random()*zvel-zvel/2]
            );
    }
    function sCopy(obj) {
        var o = {};
        for(var a in obj) {
            if(obj.hasOwnProperty(a)){ o[a] = obj[a]; }
        }
        return o;
    }
    
    window.addEventListener('load', onLoad, false);
    function onLoad(evt) {
        
       var canvas = document.querySelector('canvas');
        ctx = canvas.getContext("2d");
        window.onresize = function () {
		    ctx.canvas.height = document.body.offsetHeight;
		    ctx.canvas.width = document.body.offsetWidth;
		};
        window.onresize();
        
        
        
        canvas.addEventListener('mousedown', function(evt) { mouse = true; 
            lastx=((evt.layerX||evt.offsetX||evt.clientX) - ctx.canvas.width/2)/ctx.canvas.width * Math.PI*2;; 
            lasty=(-evt.layerY||evt.offsetY||evt.clientY); 
        });
        canvas.addEventListener('mouseup', function(evt) { mouse = false;  });
        canvas.addEventListener('mousemove', function(evt) {
            if(!mouse)return;
            
            var ex = ( evt.layerX||evt.offsetX||evt.clientX);
            var ey = (-evt.layerY||evt.offsetY||evt.clientY);
            
            var r = ((ex - ctx.canvas.width/2)/ctx.canvas.width) * Math.PI*2;
            ry += r - lastx;
            lastx = r;
            
            z += ey - lasty;
            if(z > 1000) {z = 1000; }
            if(z < 30) {z = 30; }
            lasty = ey;
        });
        
        init();
        render();
    }
    
var gui = new dat.GUI();
gui.close();
var c  = gui.add(window, "numpts",1, 2000);
gui.add(window, "bounce", 0.1, 0.8);
gui.add(window, "color", 0, 360);
gui.add(window, "ttl", 0, 40);
gui.add(window, "gravity", 0.1, 30);
gui.add(window, "xvel", 1, 100);
gui.add(window, "yvel", 1, 100);
gui.add(window, "zvel", 1, 100);
gui.add(window, "blurf", 0.1, 0.9);
gui.add(window, "blur", false, true);

var to;
c.onChange(function(value) {
    clearTimeout(to);
    to = setTimeout(init, 500);
});


window.requestAnimFrame = (function(){
  return window.requestAnimationFrame       ||
         window.webkitRequestAnimationFrame ||
         window.mozRequestAnimationFrame    ||
         function( callback ){
            window.setTimeout(callback, 1000 / 60);
         };
})();

              
            
!
999px

Console