Created
December 2, 2019 15:08
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Random molecule
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var canvas = document.createElement("canvas"), | |
c = canvas.getContext("2d"); | |
var w = canvas.width = window.innerWidth, | |
h = canvas.height = window.innerHeight; | |
document.body.appendChild(canvas); | |
c.fillStyle = "rgba(30,30,30,1)"; | |
c.fillRect(0, 0, w, h); | |
class polygon{ | |
constructor(x,y,r,np,av,sa){ | |
this.x = x; | |
this.y = y; | |
this.r = r; | |
this.v = av; | |
this.a0 = sa; | |
this.np = np; | |
this.p = new Array(np); | |
} | |
calc(x,y){ | |
if(x && y){ | |
this.x = x; | |
this.y = y; | |
} | |
for(var i = 0; i < this.np; i++){ | |
this.p[i] = { | |
x: this.x + this.r*Math.cos((i*2*Math.PI/this.np)+this.a0), | |
y: this.y + this.r*Math.sin((i*2*Math.PI/this.np)+this.a0) | |
}; | |
} | |
this.a0 += this.v; | |
} | |
show(){ | |
c.beginPath(); | |
for(var i = 0; i < this.p.length; i++){ | |
c.lineTo(this.p[i].x,this.p[i].y); | |
} | |
c.strokeStyle="white"; | |
c.lineWidth="0.1"; | |
c.closePath(); | |
c.stroke(); | |
// for(var i = 0; i < this.p.length; i++){ | |
// if(i%3 == 0){ | |
// c.beginPath(); | |
// c.rect(this.p[i].x-0.5,this.p[i].y-0.5,1,1); | |
// c.fillStyle="white"; | |
// c.fill(); | |
// } | |
// } | |
} | |
} | |
var poly = [], | |
num = 1000, | |
x = 0, | |
y = 0, | |
r = 100, | |
np = Math.floor(Math.random()*8)+2, | |
sf = 2*Math.floor(Math.random()*3)+2, | |
t = 0; | |
for(var i = 0; i < num; i++){ | |
poly.push(new polygon(w/2,h/2,100+100*Math.cos(i*sf*Math.PI/num),np,0.05,Math.PI/2+i*Math.PI*4/num)); | |
} | |
function draw() { | |
r = 100*Math.cos(t); | |
for(var i = 0; i < num; i++){ | |
x = w/2+r*Math.cos(i*2*Math.PI/num); | |
y = h/2+r*Math.sin(i*2*Math.PI/num); | |
poly[i].calc(x,y); | |
poly[i].show(); | |
} | |
t += Math.PI*2/(num); | |
} | |
var mouse = { | |
x: w / 2, | |
y: h / 2 | |
}; | |
var last_mouse = { | |
x: 0, | |
y: 0 | |
}; | |
canvas.addEventListener( | |
"mousemove", | |
function(e) { | |
last_mouse.x = mouse.x; | |
last_mouse.y = mouse.y; | |
mouse.x = e.pageX - this.offsetLeft; | |
mouse.y = e.pageY - this.offsetTop; | |
}, | |
false | |
); | |
window.requestAnimFrame = (function() { | |
return window.requestAnimationFrame || | |
window.webkitRequestAnimationFrame || | |
window.mozRequestAnimationFrame || | |
window.oRequestAnimationFrame || | |
window.msRequestAnimationFrame || | |
function(callback) { | |
window.setTimeout(callback, 1000 / 60); | |
}; | |
})(); | |
function loop() { | |
setTimeout(function() { | |
window.requestAnimFrame(loop); | |
c.fillStyle = "rgba(30,30,30,1)"; | |
c.fillRect(0, 0, w, h); | |
draw(); | |
}, 1000 / 60); | |
} | |
window.addEventListener('resize', function() { | |
w = canvas.width = window.innerWidth, | |
h = canvas.height = window.innerHeight; | |
c.fillStyle = "rgba(30,30,30,1)"; | |
c.fillRect(0, 0, w, h); | |
}); | |
loop(); |
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body, | |
html { | |
margin: 0px; | |
padding: 0px; | |
position: fixed; | |
} |
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