| 1 | (function(){ |
| 2 | window.HPX = window.HPX || {}; |
| 3 | window.HPX['magnetic-field'] = function(el){ |
| 4 | const U = window.HPX._u; |
| 5 | const k = U.canvas(el), ctx = k.ctx; |
| 6 | const pal = U.palette(el); |
| 7 | const N = 60; |
| 8 | const parts = Array.from({length:N}, (_,i) => ({ |
| 9 | phase: Math.random()*Math.PI*2, |
| 10 | freq: U.rand(0.4, 1.2), |
| 11 | amp: U.rand(30, 90), |
| 12 | y0: U.rand(0.15, 0.85), |
| 13 | c: pal[i%pal.length], |
| 14 | trail: [] |
| 15 | })); |
| 16 | const stop = U.loop((t) => { |
| 17 | ctx.fillStyle = 'rgba(0,0,0,0.08)'; |
| 18 | ctx.fillRect(0,0,k.w,k.h); |
| 19 | for (const p of parts){ |
| 20 | const x = ((t*80 + p.phase*50) % (k.w+100)) - 50; |
| 21 | const y = k.h*p.y0 + Math.sin(x*0.02 + p.phase + t*p.freq)*p.amp; |
| 22 | p.trail.push([x,y]); |
| 23 | if (p.trail.length > 18) p.trail.shift(); |
| 24 | ctx.strokeStyle = p.c; |
| 25 | ctx.lineWidth = 2; |
| 26 | ctx.beginPath(); |
| 27 | for (let i=0;i<p.trail.length;i++){ |
| 28 | const [tx,ty] = p.trail[i]; |
| 29 | if (i===0) ctx.moveTo(tx,ty); else ctx.lineTo(tx,ty); |
| 30 | } |
| 31 | ctx.globalAlpha = 0.7; |
| 32 | ctx.stroke(); |
| 33 | ctx.globalAlpha = 1; |
| 34 | ctx.fillStyle = p.c; |
| 35 | ctx.beginPath(); ctx.arc(x,y,2.5,0,Math.PI*2); ctx.fill(); |
| 36 | } |
| 37 | }); |
| 38 | return { stop(){ stop(); k.destroy(); } }; |
| 39 | }; |
| 40 | })(); |
| 41 |