| 1 | (function(){ |
| 2 | window.HPX = window.HPX || {}; |
| 3 | window.HPX['starfield'] = function(el){ |
| 4 | const U = window.HPX._u; |
| 5 | const k = U.canvas(el), ctx = k.ctx; |
| 6 | const tx = U.text(el, '#ffffff'); |
| 7 | const N = 260; |
| 8 | const stars = Array.from({length:N}, () => ({ |
| 9 | x: U.rand(-1,1), y: U.rand(-1,1), z: Math.random() |
| 10 | })); |
| 11 | const stop = U.loop(() => { |
| 12 | ctx.fillStyle = 'rgba(0,0,0,0.25)'; |
| 13 | ctx.fillRect(0,0,k.w,k.h); |
| 14 | const cx = k.w/2, cy = k.h/2; |
| 15 | for (const s of stars){ |
| 16 | s.z -= 0.006; |
| 17 | if (s.z <= 0.02) { s.x = U.rand(-1,1); s.y = U.rand(-1,1); s.z = 1; } |
| 18 | const px = cx + (s.x/s.z)*cx; |
| 19 | const py = cy + (s.y/s.z)*cy; |
| 20 | if (px<0||py<0||px>k.w||py>k.h) continue; |
| 21 | const r = (1-s.z)*2.4; |
| 22 | ctx.globalAlpha = 1-s.z; |
| 23 | ctx.fillStyle = tx; |
| 24 | ctx.beginPath(); ctx.arc(px,py,r,0,Math.PI*2); ctx.fill(); |
| 25 | } |
| 26 | ctx.globalAlpha = 1; |
| 27 | }); |
| 28 | return { stop(){ stop(); k.destroy(); } }; |
| 29 | }; |
| 30 | })(); |
| 31 |