| 1 | /* html-ppt fx :: shared helpers */ |
| 2 | (function(){ |
| 3 | window.HPX = window.HPX || {}; |
| 4 | const U = window.HPX._u = {}; |
| 5 | |
| 6 | U.css = (el, name, fb) => { |
| 7 | const v = getComputedStyle(el).getPropertyValue(name).trim(); |
| 8 | return v || fb; |
| 9 | }; |
| 10 | |
| 11 | U.accent = (el, fb) => U.css(el, '--accent', fb || '#7c5cff'); |
| 12 | U.accent2 = (el, fb) => U.css(el, '--accent-2', fb || '#22d3ee'); |
| 13 | U.text = (el, fb) => U.css(el, '--text-1', fb || '#eaeaf2'); |
| 14 | |
| 15 | U.palette = (el) => [ |
| 16 | U.accent(el, '#7c5cff'), |
| 17 | U.accent2(el, '#22d3ee'), |
| 18 | U.css(el, '--ok', '#22c55e'), |
| 19 | U.css(el, '--warn', '#f59e0b'), |
| 20 | U.css(el, '--danger', '#ef4444'), |
| 21 | ]; |
| 22 | |
| 23 | U.canvas = (el) => { |
| 24 | if (getComputedStyle(el).position === 'static') el.style.position = 'relative'; |
| 25 | const c = document.createElement('canvas'); |
| 26 | c.style.cssText = 'position:absolute;inset:0;width:100%;height:100%;pointer-events:none;display:block;'; |
| 27 | el.appendChild(c); |
| 28 | const ctx = c.getContext('2d'); |
| 29 | let w = 0, h = 0, dpr = Math.max(1, Math.min(2, window.devicePixelRatio||1)); |
| 30 | const fit = () => { |
| 31 | const r = el.getBoundingClientRect(); |
| 32 | w = Math.max(1, r.width|0); |
| 33 | h = Math.max(1, r.height|0); |
| 34 | c.width = (w*dpr)|0; |
| 35 | c.height = (h*dpr)|0; |
| 36 | ctx.setTransform(dpr,0,0,dpr,0,0); |
| 37 | }; |
| 38 | fit(); |
| 39 | const ro = new ResizeObserver(fit); |
| 40 | ro.observe(el); |
| 41 | return { |
| 42 | c, ctx, |
| 43 | get w(){return w;}, get h(){return h;}, get dpr(){return dpr;}, |
| 44 | destroy(){ |
| 45 | try{ro.disconnect();}catch(e){} |
| 46 | if (c.parentNode) c.parentNode.removeChild(c); |
| 47 | } |
| 48 | }; |
| 49 | }; |
| 50 | |
| 51 | U.loop = (fn) => { |
| 52 | let raf = 0, stopped = false, t0 = performance.now(); |
| 53 | const tick = (t) => { |
| 54 | if (stopped) return; |
| 55 | fn((t - t0)/1000); |
| 56 | raf = requestAnimationFrame(tick); |
| 57 | }; |
| 58 | raf = requestAnimationFrame(tick); |
| 59 | return () => { stopped = true; cancelAnimationFrame(raf); }; |
| 60 | }; |
| 61 | |
| 62 | U.rand = (a,b) => a + Math.random()*(b-a); |
| 63 | })(); |
| 64 |