34 lines
1.0 KiB
JavaScript
34 lines
1.0 KiB
JavaScript
(function(){
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window.HPX = window.HPX || {};
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window.HPX['galaxy-swirl'] = function(el){
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const U = window.HPX._u;
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const k = U.canvas(el), ctx = k.ctx;
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const pal = U.palette(el);
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const N = 800;
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const parts = Array.from({length:N}, (_,i) => {
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const arm = i%3;
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const t = Math.random();
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const r = t*180 + 8;
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const base = (arm/3)*Math.PI*2;
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return { r, a: base + Math.log(r+1)*1.6 + U.rand(-0.2,0.2),
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c: pal[arm%pal.length],
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s: U.rand(0.8, 2.2) };
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});
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const stop = U.loop((t) => {
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ctx.fillStyle = 'rgba(0,0,0,0.15)';
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ctx.fillRect(0,0,k.w,k.h);
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const cx=k.w/2, cy=k.h/2;
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for (const p of parts){
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const a = p.a + t*0.15;
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const x = cx + Math.cos(a)*p.r;
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const y = cy + Math.sin(a)*p.r*0.7;
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ctx.fillStyle = p.c;
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ctx.globalAlpha = 0.7;
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ctx.beginPath(); ctx.arc(x,y,p.s,0,Math.PI*2); ctx.fill();
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}
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ctx.globalAlpha = 1;
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});
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return { stop(){ stop(); k.destroy(); } };
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};
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})();
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