| 1 | (function(){ |
| 2 | window.HPX = window.HPX || {}; |
| 3 | window.HPX['matrix-rain'] = function(el){ |
| 4 | const U = window.HPX._u; |
| 5 | const k = U.canvas(el), ctx = k.ctx; |
| 6 | const glyphs = 'アイウエオカキクケコサシスセソタチツテトナニヌネノ0123456789ABCDEF'.split(''); |
| 7 | const fs = 16; |
| 8 | let cols = 0, drops = []; |
| 9 | const init = () => { |
| 10 | cols = Math.ceil(k.w/fs); |
| 11 | drops = Array.from({length:cols}, () => U.rand(-20, 0)); |
| 12 | }; |
| 13 | init(); |
| 14 | let lw = k.w, lh = k.h; |
| 15 | const stop = U.loop(() => { |
| 16 | if (k.w!==lw || k.h!==lh){ init(); lw=k.w; lh=k.h; } |
| 17 | ctx.fillStyle = 'rgba(0,0,0,0.08)'; |
| 18 | ctx.fillRect(0,0,k.w,k.h); |
| 19 | ctx.font = fs+'px monospace'; |
| 20 | for (let i=0;i<cols;i++){ |
| 21 | const ch = glyphs[(Math.random()*glyphs.length)|0]; |
| 22 | const x = i*fs, y = drops[i]*fs; |
| 23 | ctx.fillStyle = '#9fffc9'; |
| 24 | ctx.fillText(ch, x, y); |
| 25 | ctx.fillStyle = '#00ff6a'; |
| 26 | ctx.fillText(ch, x, y - fs); |
| 27 | drops[i] += 1; |
| 28 | if (y > k.h && Math.random() > 0.975) drops[i] = 0; |
| 29 | } |
| 30 | }); |
| 31 | return { stop(){ stop(); k.destroy(); } }; |
| 32 | }; |
| 33 | })(); |
| 34 |