| 1 |
var _typoKeys = { family:'font-family', weight:'font-weight', style:'font-style', |
| 2 |
decoration:'text-decoration', transform:'text-transform', |
| 3 |
sizeDesktop:'font-size-d', sizeTablet:'font-size-t', sizeMobile:'font-size-m', |
| 4 |
lineHeightDesktop:'line-height-d', lineHeightTablet:'line-height-t', lineHeightMobile:'line-height-m', |
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letterSpacingDesktop:'letter-spacing-d', letterSpacingTablet:'letter-spacing-t', letterSpacingMobile:'letter-spacing-m', |
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wordSpacingDesktop:'word-spacing-d', wordSpacingTablet:'word-spacing-t', wordSpacingMobile:'word-spacing-m' }; |
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function typoCssVarsForEl(el, typo, prefix) { |
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if (!typo || typeof typo !== 'object') return; |
| 9 |
Object.keys(_typoKeys).forEach(function (k) { |
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if (typo[k] !== undefined && typo[k] !== '') el.style.setProperty(prefix + _typoKeys[k], String(typo[k])); |
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}); |
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} |
| 13 |
|
| 14 |
document.addEventListener('DOMContentLoaded', function () { |
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document.querySelectorAll('.bkbg-mr-app').forEach(function (root) { |
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var opts = JSON.parse(root.dataset.opts || '{}'); |
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initMatrixRain(root, opts); |
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}); |
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}); |
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|
| 21 |
/* character set helpers */ |
| 22 |
var KATA = '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ハヒフヘホマミムメモヤユヨラリルレロワヲン'; |
| 23 |
function getChars(a) { |
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if (a.charSet === 'binary') return ['0','1']; |
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if (a.charSet === 'hex') return '0123456789ABCDEF'.split(''); |
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if (a.charSet === 'latin') return 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'.split(''); |
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if (a.charSet === 'custom') return ((a.customChars || '01').split('')); |
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return (KATA + '0123456789').split(''); |
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} |
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|
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function hslColumn(colIdx, total) { |
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return 'hsl(' + Math.round((colIdx / total) * 360) + ',100%,55%)'; |
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} |
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|
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function initMatrixRain(root, a) { |
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var height = a.height || 400; |
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var fontSize = a.fontSize || 16; |
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var speed = a.speed || 50; |
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var bgOp = (a.bgOpacity || 8) / 100; |
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var density = (a.density || 100) / 100; |
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var primary = a.primaryColor || '#00ff41'; |
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var headCol = a.headColor || '#ffffff'; |
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var bgColor = a.bgColor || '#000000'; |
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var chars = getChars(a); |
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var isRainbow = (a.colorStyle === 'rainbow'); |
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var glowOn = a.glowEffect !== false; |
| 47 |
|
| 48 |
/* build DOM */ |
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var wrap = document.createElement('div'); |
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wrap.className = 'bkbg-mr-wrap'; |
| 51 |
wrap.style.height = height + 'px'; |
| 52 |
|
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typoCssVarsForEl(wrap, a.overlayTypo, '--bkbg-mr-ot-'); |
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typoCssVarsForEl(wrap, a.subtextTypo, '--bkbg-mr-os-'); |
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|
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var canvas = document.createElement('canvas'); |
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canvas.className = 'bkbg-mr-canvas'; |
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canvas.height = height; |
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wrap.appendChild(canvas); |
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|
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/* overlay text */ |
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if (a.showOverlay) { |
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var overlay = document.createElement('div'); |
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overlay.className = 'bkbg-mr-overlay'; |
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overlay.style.background = a.overlayBg || 'rgba(0,0,0,0.35)'; |
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|
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if (a.overlayText) { |
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var ot = document.createElement('h2'); |
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ot.className = 'bkbg-mr-overlay-title'; |
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ot.style.color = a.overlayTextColor || '#00ff41'; |
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ot.textContent = a.overlayText; |
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overlay.appendChild(ot); |
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} |
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if (a.overlaySubtext) { |
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var os = document.createElement('p'); |
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os.className = 'bkbg-mr-overlay-sub'; |
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os.style.color = a.overlayTextColor || '#00ff41'; |
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os.textContent = a.overlaySubtext; |
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overlay.appendChild(os); |
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} |
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wrap.appendChild(overlay); |
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} |
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|
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root.appendChild(wrap); |
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|
| 86 |
/* canvas sizing */ |
| 87 |
var ctx = canvas.getContext('2d'); |
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function resize() { |
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canvas.width = wrap.offsetWidth || window.innerWidth; |
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canvas.height = height; |
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initDrops(); |
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} |
| 93 |
|
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var drops = []; |
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function initDrops() { |
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var cols = Math.floor(canvas.width / fontSize); |
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drops = []; |
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for (var i = 0; i < cols; i++) { |
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if (Math.random() > density) { |
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drops.push(null); /* skip column based on density */ |
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} else { |
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drops.push(a.randomStart ? Math.floor(Math.random() * -(height / fontSize)) : 0); |
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} |
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} |
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} |
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|
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resize(); |
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window.addEventListener('resize', resize); |
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|
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/* animation */ |
| 111 |
var paused = false; |
| 112 |
var raf = null; |
| 113 |
var lastTime = 0; |
| 114 |
var interval = 1000 / (speed / 10 + 5); |
| 115 |
var pauseBadge = null; |
| 116 |
|
| 117 |
function draw(ts) { |
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raf = requestAnimationFrame(draw); |
| 119 |
if (paused) return; |
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if (ts - lastTime < interval) return; |
| 121 |
lastTime = ts; |
| 122 |
|
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/* fade trail */ |
| 124 |
ctx.fillStyle = hexToRgba(bgColor, bgOp); |
| 125 |
ctx.fillRect(0, 0, canvas.width, canvas.height); |
| 126 |
|
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if (glowOn) { |
| 128 |
ctx.shadowBlur = 8; |
| 129 |
ctx.shadowColor = primary; |
| 130 |
} else { |
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ctx.shadowBlur = 0; |
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} |
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|
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ctx.font = fontSize + 'px monospace'; |
| 135 |
|
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var cols = drops.length; |
| 137 |
for (var i = 0; i < cols; i++) { |
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if (drops[i] === null) continue; |
| 139 |
|
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var ch = chars[Math.floor(Math.random() * chars.length)]; |
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var x = i * fontSize; |
| 142 |
var y = drops[i] * fontSize; |
| 143 |
|
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/* head char (bright white / highlight) */ |
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ctx.fillStyle = headCol; |
| 146 |
ctx.fillText(ch, x, y); |
| 147 |
|
| 148 |
/* fade the previous cells to primary color */ |
| 149 |
if (isRainbow) { |
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ctx.fillStyle = hslColumn(i, cols); |
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} else { |
| 152 |
ctx.fillStyle = primary; |
| 153 |
} |
| 154 |
|
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/* draw a few chars above the head position in faded color to extend trail */ |
| 156 |
var trailLen = Math.min(a.fadeLength || 20, Math.floor(Math.random() * 8) + 4); |
| 157 |
for (var t = 1; t <= trailLen; t++) { |
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var ty = (drops[i] - t) * fontSize; |
| 159 |
if (ty < 0) break; |
| 160 |
var alpha = 1 - t / trailLen; |
| 161 |
if (isRainbow) { |
| 162 |
ctx.fillStyle = 'hsla(' + Math.round((i / cols) * 360) + ',100%,55%,' + alpha + ')'; |
| 163 |
} else { |
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ctx.fillStyle = hexToRgbaFull(primary, alpha); |
| 165 |
} |
| 166 |
ctx.fillText(chars[Math.floor(Math.random() * chars.length)], x, ty); |
| 167 |
} |
| 168 |
|
| 169 |
if (y > canvas.height && Math.random() > 0.975) { |
| 170 |
drops[i] = 0; |
| 171 |
} |
| 172 |
drops[i]++; |
| 173 |
} |
| 174 |
} |
| 175 |
|
| 176 |
raf = requestAnimationFrame(draw); |
| 177 |
|
| 178 |
/* pause/resume badge */ |
| 179 |
function togglePause() { |
| 180 |
paused = !paused; |
| 181 |
if (paused) { |
| 182 |
if (!pauseBadge) { |
| 183 |
pauseBadge = document.createElement('div'); |
| 184 |
pauseBadge.className = 'bkbg-mr-paused-badge'; |
| 185 |
pauseBadge.textContent = '■ PAUSED'; |
| 186 |
wrap.appendChild(pauseBadge); |
| 187 |
} |
| 188 |
pauseBadge.style.display = 'block'; |
| 189 |
} else { |
| 190 |
if (pauseBadge) pauseBadge.style.display = 'none'; |
| 191 |
} |
| 192 |
} |
| 193 |
|
| 194 |
if (a.clickToPause) { |
| 195 |
canvas.addEventListener('click', togglePause); |
| 196 |
if (a.showOverlay && overlay) overlay.style.pointerEvents = 'auto'; |
| 197 |
} |
| 198 |
if (a.pauseOnHover) { |
| 199 |
canvas.addEventListener('mouseenter', function () { if (!paused) { paused = true; } }); |
| 200 |
canvas.addEventListener('mouseleave', function () { paused = false; }); |
| 201 |
} |
| 202 |
|
| 203 |
/* cleanup on page unload */ |
| 204 |
window.addEventListener('beforeunload', function () { cancelAnimationFrame(raf); }); |
| 205 |
} |
| 206 |
|
| 207 |
function hexToRgba(hex, alpha) { |
| 208 |
var r = 0, g = 0, b = 0; |
| 209 |
if (hex && hex.startsWith('#')) { |
| 210 |
var h = hex.replace('#',''); |
| 211 |
if (h.length === 3) h = h[0]+h[0]+h[1]+h[1]+h[2]+h[2]; |
| 212 |
r = parseInt(h.slice(0,2),16) || 0; |
| 213 |
g = parseInt(h.slice(2,4),16) || 0; |
| 214 |
b = parseInt(h.slice(4,6),16) || 0; |
| 215 |
} |
| 216 |
return 'rgba(' + r + ',' + g + ',' + b + ',' + alpha + ')'; |
| 217 |
} |
| 218 |
function hexToRgbaFull(hex, alpha) { return hexToRgba(hex, alpha); } |
| 219 |
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