| 1 | (function(){ |
| 2 | window.HPX = window.HPX || {}; |
| 3 | window.HPX['constellation'] = function(el){ |
| 4 | const U = window.HPX._u; |
| 5 | const k = U.canvas(el), ctx = k.ctx; |
| 6 | const ac = U.accent(el,'#9fb4ff'); |
| 7 | const N = 70; |
| 8 | let pts = []; |
| 9 | const seed = () => { |
| 10 | pts = Array.from({length:N}, () => ({ |
| 11 | x: Math.random()*k.w, y: Math.random()*k.h, |
| 12 | vx: U.rand(-0.3,0.3), vy: U.rand(-0.3,0.3) |
| 13 | })); |
| 14 | }; |
| 15 | seed(); |
| 16 | let lw=k.w, lh=k.h; |
| 17 | const stop = U.loop(() => { |
| 18 | if (k.w!==lw||k.h!==lh){ seed(); lw=k.w; lh=k.h; } |
| 19 | ctx.clearRect(0,0,k.w,k.h); |
| 20 | for (const p of pts){ |
| 21 | p.x += p.vx; p.y += p.vy; |
| 22 | if (p.x<0||p.x>k.w) p.vx*=-1; |
| 23 | if (p.y<0||p.y>k.h) p.vy*=-1; |
| 24 | } |
| 25 | for (let i=0;i<N;i++){ |
| 26 | for (let j=i+1;j<N;j++){ |
| 27 | const a=pts[i], b=pts[j]; |
| 28 | const d = Math.hypot(a.x-b.x, a.y-b.y); |
| 29 | if (d < 150){ |
| 30 | ctx.globalAlpha = 1 - d/150; |
| 31 | ctx.strokeStyle = ac; ctx.lineWidth=1; |
| 32 | ctx.beginPath(); ctx.moveTo(a.x,a.y); ctx.lineTo(b.x,b.y); ctx.stroke(); |
| 33 | } |
| 34 | } |
| 35 | } |
| 36 | ctx.globalAlpha = 1; |
| 37 | ctx.fillStyle = ac; |
| 38 | for (const p of pts){ |
| 39 | ctx.beginPath(); ctx.arc(p.x,p.y,1.8,0,Math.PI*2); ctx.fill(); |
| 40 | } |
| 41 | }); |
| 42 | return { stop(){ stop(); k.destroy(); } }; |
| 43 | }; |
| 44 | })(); |
| 45 |