JavaScript

语言：

JaveScriptBabelCoffeeScript

确定

const _C = document.getElementById('canvas') /* canvas element */ ,

C = _C.getContext('2d') /* 2L canvas context */ ,

L = _C.width /* edge length of canvas square */ ,

O = -.5 * L /* top left corner coord if 0,0 is in the middle */ ,

R = L / Math.SQRT2 /* half diagonal of canvas square */ ,

RC = .05 * L /* polygon circumradius */ ,

UA = 2 * Math.PI / 360 /* unit angle = 1 degree */ ,

POLY = [] /* array to fill with polygons */ ,

N = 500 /* total number of polygons */ ,

/* hex values for paint buckets */

THEME = ['#c76cd8', '#ee4198', '#c9244e', '#e57442', '#f9c240'],

NT = THEME.length /* number of paint buckets */ ,

OPTS = ['fill', 'stroke'],

NO = OPTS.length,

FN = ['line', 'move'];

function rand(max = 1, min = 0, dec = 0) {

return +(min + (max - min) * Math.random()).toFixed(dec)

};

class RandPoly {

constructor() {

/* SHAPE PROPERTIES */

this.n = rand(8, 3); /* number of vertices */

this.α = 2 * Math.PI / this.n; /* base angle corresp to an edge */

/* PAINT PROPERTIES */

this.o = rand();

this.b = rand(NT - 1); /* number of paint bucket we put it in */

/* POSITION PROPERTIES */

/* polar coordinates */

this.r = rand(R + RC); /* position radius */

this.β = Math.random() * 2 * Math.PI; /* position angle */

this.γ = rand(1.5, .125, 3) * UA; /* revolution speed */

}

get coords() {

let vx = [],

f;

if (--this.r < 0) this.r = R + RC;

this.β += rand(1.1, .9, 3) * this.γ;

f = this.r / R;

for (let i = 0; i < this.n; i++) {

let ca = this.β + i * this.α;

vx.push([

Math.round(this.r * Math.cos(this.β) + f * RC * Math.cos(ca)),

Math.round(this.r * Math.sin(this.β) + f * RC * Math.sin(ca))

])

}

return vx

}

};

function draw() {

C.clearRect(O, O, L, L);

for (let i = 0; i < NT; i++) {

let b = POLY.filter(c => c.b === i);

for (let j = 0; j < NO; j++) {

let opt = b.filter(c => c.o === j);

C[`${OPTS[j]}Style`] = THEME[i];

C.beginPath();

opt.forEach(p => {

let vx = p.coords;

for (let k = 0; k <= p.n; k++) {

C[k ? 'lineTo' : 'moveTo'](...vx[k % p.n])

}

});

C.closePath();

C[`${OPTS[j]}`]();

}

}

requestAnimationFrame(draw);

};

function init() {

C.translate(-O, -O);

C.lineWidth = 3;

C.globalCompositeOperation = 'screen'

for (let i = 0; i < N; i++) {

let p = new RandPoly();

POLY.push(p);

}

draw()

};

init();