Install
That writes one file:compositions/components/caption-neon-accent.html.
Source
caption-neon-accent.html
caption-neon-accent.html
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Neon Accent</title>
<link rel="preconnect" href="https://fonts.googleapis.com" />
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
<link
href="https://fonts.googleapis.com/css2?family=Montserrat:wght@800&display=swap"
rel="stylesheet"
/>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
html,
body {
width: 1920px;
height: 1080px;
margin: 0;
overflow: hidden;
background: transparent;
font-family: "Montserrat", Arial, sans-serif;
}
#neon-accent {
pointer-events: none;
position: relative;
width: 1920px;
height: 1080px;
overflow: hidden;
background: transparent;
}
.caption-layer {
position: absolute;
inset: 0;
z-index: 20;
pointer-events: none;
transform: translateZ(0);
}
.safe-zone {
position: absolute;
bottom: 100px;
left: 50%;
transform: translateX(-50%);
width: 1400px;
height: 260px;
display: flex;
align-items: center;
justify-content: center;
}
.caption-group {
position: absolute;
left: 0;
top: 0;
width: 1400px;
height: 260px;
display: flex;
align-items: center;
justify-content: center;
opacity: 0;
transform-origin: 50% 50%;
will-change: transform;
backface-visibility: hidden;
}
.caption-copy {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
max-width: 1400px;
text-align: center;
}
.caption-line {
display: flex;
align-items: center;
justify-content: center;
gap: 16px;
width: max-content;
max-width: 1400px;
line-height: 1.1;
white-space: nowrap;
}
.caption-word {
display: inline-block;
color: #ffffff;
font-family: "Montserrat", Arial, sans-serif;
font-weight: 800;
font-size: 88px;
line-height: 1.1;
letter-spacing: 0;
text-transform: uppercase;
}
.caption-word.accent {
font-size: 106px;
}
</style>
</head>
<body>
<div
id="neon-accent"
data-composition-id="caption-neon-accent"
data-timeline-locked
data-start="0"
data-duration="8"
data-fps="30"
data-width="1920"
data-height="1080"
>
<div class="caption-layer" aria-hidden="true">
<div id="caption-stage" class="safe-zone"></div>
</div>
</div>
<script>
var DURATION = 8;
var SAFE_ZONE_WIDTH = 1400;
var BASE_FONT_SIZE = 88;
var ACCENT_FONT_SIZE = 106;
var MIN_FONT_SIZE = 62;
var MAX_WORDS_PER_GROUP = 4;
var WORD_SPACING = 16;
var PAUSE_THRESHOLD = 0.1;
var ENTRY_DURATION = 7 / 30;
var WIGGLE_DISTANCE = 14;
var WIGGLE_CYCLE = 2 / 1.3;
var FONT_WIDTH_SAFETY = 1.14;
var PRIMARY_COLOR = "#FFFFFF";
var ACCENT_COLORS = ["#53FF01", "#FF0002", "#FCFF00"];
var TRANSITION_WORDS = new Set([
"the",
"a",
"an",
"and",
"or",
"but",
"is",
"are",
"was",
"were",
"to",
"of",
"in",
"on",
"at",
"for",
"with",
"by",
"from",
"as",
"it",
"its",
"this",
"that",
"these",
"those",
"be",
"been",
"have",
"has",
"had",
"do",
"does",
"did",
"will",
"would",
"could",
"should",
"may",
"might",
"must",
"can",
"if",
"then",
"so",
"just",
"not",
"no",
"yes",
"up",
"out",
"about",
"lets",
"you",
"write",
"render",
]);
var KEYWORDS = new Set(["hyperframes", "html", "professional", "code", "cinema"]);
var TRANSCRIPT = [
{ text: "Every", start: 0.0, end: 0.3 },
{ text: "great", start: 0.3, end: 0.55 },
{ text: "video", start: 0.55, end: 0.85 },
{ text: "starts", start: 0.85, end: 1.1 },
{ text: "with", start: 1.1, end: 1.25 },
{ text: "a", start: 1.25, end: 1.35 },
{ text: "single", start: 1.35, end: 1.65 },
{ text: "frame.", start: 1.65, end: 2.0 },
{ text: "HyperFrames", start: 2.1, end: 2.65 },
{ text: "lets", start: 2.65, end: 2.85 },
{ text: "you", start: 2.85, end: 2.95 },
{ text: "write", start: 2.95, end: 3.15 },
{ text: "HTML", start: 3.15, end: 3.55 },
{ text: "and", start: 3.55, end: 3.65 },
{ text: "render", start: 3.65, end: 3.95 },
{ text: "professional", start: 3.95, end: 4.45 },
{ text: "video.", start: 4.45, end: 4.8 },
{ text: "No", start: 4.9, end: 5.05 },
{ text: "timeline.", start: 5.05, end: 5.45 },
{ text: "No", start: 5.5, end: 5.65 },
{ text: "drag", start: 5.65, end: 5.85 },
{ text: "and", start: 5.85, end: 5.95 },
{ text: "drop.", start: 5.95, end: 6.25 },
{ text: "Just", start: 6.35, end: 6.55 },
{ text: "code", start: 6.55, end: 6.8 },
{ text: "that", start: 6.8, end: 6.95 },
{ text: "becomes", start: 6.95, end: 7.3 },
{ text: "cinema.", start: 7.3, end: 7.7 },
];
var _fitCanvas = document.createElement("canvas");
var _fitCtx = _fitCanvas.getContext("2d");
function fitFontSize(text, baseFontSize, fontWeight, fontFamily, maxWidth) {
var size = baseFontSize;
var minSize = Math.floor(baseFontSize * 0.45);
while (size > minSize) {
_fitCtx.font = fontWeight + " " + size + "px " + fontFamily;
if (_fitCtx.measureText(text).width <= maxWidth) return size;
size -= 2;
}
return minSize;
}
gsap.registerPlugin && gsap.registerPlugin();
function cleanText(text) {
return String(text || "").trim();
}
function normalizeWords(rawWords) {
return rawWords
.map(function (item) {
return {
text: cleanText(item.word || item.text),
start: Math.max(0, Number(item.start) || 0),
end: Math.min(DURATION, Math.max(Number(item.start) || 0, Number(item.end) || 0)),
};
})
.filter(function (word) {
return word.text.length > 0;
});
}
var measureCanvas = document.createElement("canvas");
var measureContext = measureCanvas.getContext("2d");
function seededRandom(seed) {
var x = Math.sin(seed * 9999) * 10000;
return x - Math.floor(x);
}
function isKeyword(text) {
return KEYWORDS.has(text.toLowerCase().replace(/[^a-z]/g, ""));
}
function assignWordColors(words, groupIndex) {
return words.map(function (word) {
if (isKeyword(word.text)) {
var colorIndex = Math.floor(seededRandom(groupIndex * 23 + 7) * ACCENT_COLORS.length);
return ACCENT_COLORS[colorIndex];
}
var clean = word.text.toLowerCase().replace(/[^a-z']/g, "");
if (TRANSITION_WORDS.has(clean)) return PRIMARY_COLOR;
var rand = seededRandom(groupIndex * 7 + words.indexOf(word));
if (rand > 0.6) {
var ci = Math.floor(rand * ACCENT_COLORS.length) % ACCENT_COLORS.length;
return ACCENT_COLORS[ci];
}
return PRIMARY_COLOR;
});
}
function measureWord(word, color, fontSize) {
var size = color === PRIMARY_COLOR ? fontSize : fontSize * 1.2;
measureContext.font = "800 " + size + "px Montserrat";
return measureContext.measureText(word.text.toUpperCase()).width * FONT_WIDTH_SAFETY;
}
function measureLineWidth(words, colors, fontSize) {
return words.reduce(function (total, word, index) {
return (
total +
measureWord(word, colors[index] || PRIMARY_COLOR, fontSize) +
(index ? WORD_SPACING : 0)
);
}, 0);
}
function splitLinesForGroup(words, colors, fontSize) {
var maxLineWidth = SAFE_ZONE_WIDTH;
if (
words.some(function (word, i) {
return measureWord(word, colors[i] || PRIMARY_COLOR, fontSize) > maxLineWidth;
})
)
return null;
if (measureLineWidth(words, colors, fontSize) <= maxLineWidth)
return [{ words: words, colors: colors }];
var best = null;
var bestDiff = Infinity;
for (var split = 1; split < words.length; split++) {
var fw = words.slice(0, split),
sw = words.slice(split);
var fc = colors.slice(0, split),
sc = colors.slice(split);
var fW = measureLineWidth(fw, fc, fontSize);
var sW = measureLineWidth(sw, sc, fontSize);
if (fW <= maxLineWidth && sW <= maxLineWidth) {
var diff = Math.abs(fW - sW);
if (diff < bestDiff) {
best = [
{ words: fw, colors: fc },
{ words: sw, colors: sc },
];
bestDiff = diff;
}
}
}
return best;
}
function makeGroups(words) {
var groups = [];
var current = [];
words.forEach(function (word, index) {
var nextWord = words[index + 1];
var testGroup = current.concat([word]);
var exceedsWords = testGroup.length > MAX_WORDS_PER_GROUP;
var colors = assignWordColors(testGroup, groups.length);
var exceedsFit = !splitLinesForGroup(testGroup, colors, BASE_FONT_SIZE);
if (exceedsWords || exceedsFit) {
if (current.length) groups.push(makeGroup(current, groups.length));
current = [word];
return;
}
current.push(word);
var punctuation = /[,.:!?]$/.test(word.text);
var pause = nextWord ? nextWord.start - word.end : 0;
if (
!nextWord ||
punctuation ||
pause >= PAUSE_THRESHOLD ||
current.length >= MAX_WORDS_PER_GROUP
) {
groups.push(makeGroup(current, groups.length));
current = [];
}
});
if (current.length) groups.push(makeGroup(current, groups.length));
return groups;
}
function makeGroup(words, groupIndex) {
var colors = assignWordColors(words, groupIndex);
var groupText = words
.map(function (w) {
return w.text.toUpperCase();
})
.join(" ");
var fontSize = fitFontSize(groupText, BASE_FONT_SIZE, "800", "Montserrat", SAFE_ZONE_WIDTH);
while (fontSize > MIN_FONT_SIZE && !splitLinesForGroup(words, colors, fontSize)) {
fontSize -= 2;
}
return {
words: words.slice(),
colors: colors,
fontSize: fontSize,
lines: splitLinesForGroup(words, colors, fontSize) || [{ words: words, colors: colors }],
start: words[0].start,
end: words[words.length - 1].end,
};
}
function shadowForColor(color) {
var hex = color.replace("#", "");
var r = parseInt(hex.slice(0, 2), 16);
var g = parseInt(hex.slice(2, 4), 16);
var b = parseInt(hex.slice(4, 6), 16);
var glow =
"0 0 4px rgba(" +
r +
"," +
g +
"," +
b +
",1), 0 0 10px rgba(" +
r +
"," +
g +
"," +
b +
",0.9), 0 0 20px rgba(" +
r +
"," +
g +
"," +
b +
",0.7), 0 0 40px rgba(" +
r +
"," +
g +
"," +
b +
",0.4)";
return "0 8px 16px rgba(0,0,0,0.8), 0 16px 40px rgba(0,0,0,0.6), " + glow;
}
function buildCaptions(groups) {
var stage = document.getElementById("caption-stage");
groups.forEach(function (group, groupIndex) {
var groupEl = document.createElement("div");
var copyEl = document.createElement("div");
groupEl.id = "caption-group-" + groupIndex;
groupEl.className = "caption-group";
copyEl.className = "caption-copy";
group.lines.slice(0, 2).forEach(function (line) {
var lineEl = document.createElement("div");
lineEl.className = "caption-line";
line.words.forEach(function (word, wordIndex) {
var color = line.colors[wordIndex] || PRIMARY_COLOR;
var wordEl = document.createElement("span");
wordEl.className = color === PRIMARY_COLOR ? "caption-word" : "caption-word accent";
wordEl.textContent = word.text.toUpperCase();
wordEl.style.color = color;
wordEl.style.fontSize =
color === PRIMARY_COLOR ? group.fontSize + "px" : group.fontSize * 1.2 + "px";
wordEl.style.textShadow = shadowForColor(color);
lineEl.appendChild(wordEl);
});
copyEl.appendChild(lineEl);
});
groupEl.appendChild(copyEl);
stage.appendChild(groupEl);
});
}
var WORDS = normalizeWords(TRANSCRIPT);
var GROUPS = makeGroups(WORDS);
buildCaptions(GROUPS);
window.__timelines = window.__timelines || {};
var tl = gsap.timeline({ paused: true });
var visibleStarts = GROUPS.map(function (group, groupIndex) {
var prev = GROUPS[groupIndex - 1];
var availableGap = prev ? Math.max(0, group.start - prev.end) : ENTRY_DURATION;
var entryLead = Math.min(ENTRY_DURATION, availableGap);
return Math.max(0, group.start - entryLead);
});
var allGroupEls = GROUPS.map(function (_, i) {
return document.getElementById("caption-group-" + i);
});
GROUPS.forEach(function (group, groupIndex) {
var groupEl = allGroupEls[groupIndex];
var visibleStart = visibleStarts[groupIndex];
var visibleEnd = groupIndex < GROUPS.length - 1 ? visibleStarts[groupIndex + 1] : DURATION;
var direction = groupIndex % 2 === 0 ? -1 : 1;
var D = WIGGLE_DISTANCE * direction;
var wiggleCycles = Math.max(1, Math.ceil((visibleEnd - visibleStart) / WIGGLE_CYCLE));
allGroupEls.forEach(function (otherEl, otherIndex) {
if (otherIndex !== groupIndex) tl.set(otherEl, { opacity: 0 }, visibleStart);
});
tl.set(groupEl, { opacity: 0, scale: 0.65, x: 0, y: 0 }, visibleStart);
tl.to(
groupEl,
{ opacity: 1, scale: 1, duration: ENTRY_DURATION, ease: "power3.out", force3D: true },
visibleStart,
);
tl.to(
groupEl,
{
x: D,
y: D,
duration: WIGGLE_CYCLE / 2,
ease: "sine.inOut",
yoyo: true,
repeat: Math.max(0, wiggleCycles * 2 - 1),
force3D: true,
},
visibleStart,
);
tl.set(groupEl, { opacity: 0 }, visibleEnd);
});
window.__timelines["caption-neon-accent"] = tl;
</script>
</body>
</html>
Usage
Opencompositions/components/caption-neon-accent.html and paste its contents into your composition. See the comment header in the file for detailed instructions.
Tagged captions caption-style neon glow accent.