| 1 | (function(){ |
| 2 | window.HPX = window.HPX || {}; |
| 3 | window.HPX['sparkle-trail'] = function(el){ |
| 4 | const U = window.HPX._u; |
| 5 | const k = U.canvas(el), ctx = k.ctx; |
| 6 | k.c.style.pointerEvents = 'none'; |
| 7 | el.style.cursor = 'crosshair'; |
| 8 | const pal = U.palette(el); |
| 9 | let sparks = []; |
| 10 | const onMove = (e) => { |
| 11 | const r = el.getBoundingClientRect(); |
| 12 | const x = e.clientX - r.left, y = e.clientY - r.top; |
| 13 | for (let i=0;i<3;i++){ |
| 14 | sparks.push({ |
| 15 | x, y, |
| 16 | vx: U.rand(-60,60), vy: U.rand(-80,20), |
| 17 | life: 1, c: pal[(Math.random()*pal.length)|0], |
| 18 | r: U.rand(1.5,3.5) |
| 19 | }); |
| 20 | } |
| 21 | }; |
| 22 | // auto-wiggle if no mouse moves |
| 23 | let auto = true, autoT = 0; |
| 24 | const onAny = () => { auto = false; }; |
| 25 | el.addEventListener('pointermove', onMove); |
| 26 | el.addEventListener('pointerenter', onAny); |
| 27 | const stop = U.loop(() => { |
| 28 | ctx.fillStyle = 'rgba(0,0,0,0.15)'; |
| 29 | ctx.fillRect(0,0,k.w,k.h); |
| 30 | if (auto){ |
| 31 | autoT += 0.04; |
| 32 | const x = k.w/2 + Math.cos(autoT)*k.w*0.3; |
| 33 | const y = k.h/2 + Math.sin(autoT*1.3)*k.h*0.3; |
| 34 | for (let i=0;i<3;i++){ |
| 35 | sparks.push({ |
| 36 | x, y, |
| 37 | vx: U.rand(-60,60), vy: U.rand(-80,20), |
| 38 | life: 1, c: pal[(Math.random()*pal.length)|0], |
| 39 | r: U.rand(1.5,3.5) |
| 40 | }); |
| 41 | } |
| 42 | } |
| 43 | const dt = 1/60; |
| 44 | sparks = sparks.filter(s => s.life > 0); |
| 45 | for (const s of sparks){ |
| 46 | s.vy += 160*dt; |
| 47 | s.x += s.vx*dt; s.y += s.vy*dt; |
| 48 | s.life -= 0.018; |
| 49 | ctx.globalAlpha = Math.max(0, s.life); |
| 50 | ctx.fillStyle = s.c; |
| 51 | ctx.beginPath(); ctx.arc(s.x,s.y,s.r,0,Math.PI*2); ctx.fill(); |
| 52 | } |
| 53 | ctx.globalAlpha = 1; |
| 54 | }); |
| 55 | return { stop(){ |
| 56 | el.removeEventListener('pointermove', onMove); |
| 57 | el.removeEventListener('pointerenter', onAny); |
| 58 | el.style.cursor = ''; |
| 59 | stop(); k.destroy(); |
| 60 | }}; |
| 61 | }; |
| 62 | })(); |
| 63 |