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Merged
Astrosp merged 3 commits into from
Jan 17, 2026
Merged

Dev #1

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a824c72
added more things
Astrosp Jan 16, 2026
ac1e27c
Reduce font size of #word from 56px to 36px
Astrosp Jan 16, 2026
606d9c1
more fixes
Astrosp Jan 16, 2026
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257 changes: 205 additions & 52 deletions app.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@

const textInput = document.getElementById("textInput");
const wordEl = document.getElementById("word");
const focusBox = document.getElementById("focus-box");
Expand All @@ -7,23 +8,46 @@ const playPauseBtn = document.getElementById("playPause");
const stopBtn = document.getElementById("stop");
const pivotToggle = document.getElementById("pivotToggle");

const chunkToggle = document.getElementById("chunkToggle");
const biasLabel = document.getElementById("biasLabel");
const biasButtons = document.querySelectorAll(".pivot-bias button");

const wpmSlider = document.getElementById("wpm");
const wpmVal = document.getElementById("wpmVal");

let words = [];
let positions = [];

let units = [];
let index = 0;
let running = false;
let timer = null;


let pivotBias = 0; // -1, 0, +1
let chunkEnabled = true;


wpmVal.textContent = wpmSlider.value;
wpmSlider.oninput = () => wpmVal.textContent = wpmSlider.value;
wpmSlider.oninput = () => (wpmVal.textContent = wpmSlider.value);

document.addEventListener("keydown", e => {
if (e.code !== "Space") return;
if (document.activeElement === textInput && !textInput.readOnly) return;
e.preventDefault();
togglePlayPause();
// Space = play / pause
if (e.code === "Space") {
if (document.activeElement === textInput && !textInput.readOnly) return;
e.preventDefault();
togglePlayPause();
}


if (e.code === "ArrowLeft") {
e.preventDefault();
if (running) togglePlayPause();
step(-1);
}
if (e.code === "ArrowRight") {
e.preventDefault();
if (running) togglePlayPause();
step(1);
}
});

playPauseBtn.onclick = togglePlayPause;
Expand All @@ -40,84 +64,204 @@ pivotToggle.onchange = () => {
pivotLine.classList.toggle("hidden", !pivotToggle.checked);
};


chunkToggle.onchange = () => {
chunkEnabled = chunkToggle.checked;
index = 0;
parseText();
if (!running) draw();
};


biasButtons.forEach(btn => {
btn.onclick = () => {
pivotBias += Number(btn.dataset.bias);
pivotBias = Math.max(-1, Math.min(1, pivotBias));

biasLabel.textContent =
pivotBias === 0 ? "Default" : pivotBias < 0 ? "Earlier" : "Later";

if (!running) draw();
};
});


const SEED_CHUNKS = new Set([
"in the", "of the", "to the", "for the", "on the",
"as well", "there is", "there are",
"for example", "such as", "because of", "in order",
"according to", "at least", "going to", "at one", "one of",
"part of", "due to", "in fact", "in case", "by the",
"in which", "so that", "as soon", "be able",
"the end", "the same", "the way", "some of",
"a lot", "lots of", "kind of", "sort of", "a little",
"as if", "as to", "as for", "as to", "in time",
"in place", "on time", "on place", "by far",
"by then", "up to", "out of", "due to", "ahead of", "close to", "was a", "is a",
"it is", "it was", "that is", "that was", "there was", "he was", "she was"
]);

function isChunkCandidate(a, b) {
if (!chunkEnabled) return false;
if (/[.!?,;:]$/.test(a)) return false;
if (a.length > 8 || b.length > 8) return false;
return SEED_CHUNKS.has((a + " " + b).toLowerCase());
}


function parseText() {
words = [];
positions = [];
units = [];

const text = textInput.value;
const regex = /\S+/g;
const tokens = [];
let m;

while ((m = regex.exec(text)) !== null) {
words.push(m[0]);
positions.push([m.index, m.index + m[0].length]);
tokens.push({
word: m[0],
start: m.index,
end: m.index + m[0].length
});
}

let i = 0;
while (i < tokens.length) {
if (
i + 1 < tokens.length &&
isChunkCandidate(tokens[i].word, tokens[i + 1].word)
) {
units.push(makeUnit(tokens.slice(i, i + 2)));
i += 2;
} else {
units.push(makeUnit([tokens[i]]));
i += 1;
}
}
}

function pivotIndex(word) {
if (word.length <= 1) return 0;
if (word.length <= 5) return 1;
if (word.length <= 9) return 2;
return 3;
function makeUnit(tokens) {
const text = tokens.map(t => t.word).join(" ");
const span = [tokens[0].start, tokens[tokens.length - 1].end];

let pivotWordIndex = 0;
let maxLen = 0;

tokens.forEach((t, i) => {
const clean = t.word.replace(/\W/g, "");
if (clean.length > maxLen) {
maxLen = clean.length;
pivotWordIndex = i;
}
});

return { text, span, pivotWordIndex };
}

function highlight(i) {
const p = positions[i];
if (!p) return;
textInput.focus();
textInput.setSelectionRange(p[0], p[1]);
scrollHighlightIntoView();

function basePivotIndex(word) {
const len = word.length;

if (len <= 4) return 1;
if (len <= 7) return 2;
if (len <= 10) return 3;


return Math.min(len - 2, Math.floor(len * 0.35));
}

function scrollHighlightIntoView() {
const ta = textInput;
const before = ta.value.slice(0, ta.selectionStart);
const lines = before.split("\n");
const line = lines.length - 1;
const lineHeight = 20;
const center = ta.clientHeight / 2;
ta.scrollTop = line * lineHeight - center;

function highlight(unit) {
textInput.focus();
textInput.setSelectionRange(unit.span[0], unit.span[1]);
}

function draw() {
if (!words[index]) return;
const unit = units[index];
if (!unit) return;

highlight(index);
highlight(unit);

const raw = words[index].replace(/^[\W_]+|[\W_]+$/g, "");
const p = pivotIndex(raw);
const pre = raw.slice(0, p);
const mid = raw[p] || "";
const post = raw.slice(p + 1);
const words = unit.text.split(" ");
const pivotWord = words[unit.pivotWordIndex];
const clean = pivotWord.replace(/\W/g, "");

wordEl.innerHTML =
`<span>${pre}</span><span class="pivot">${mid}</span><span>${post}</span>`;
let p = basePivotIndex(clean) + pivotBias;
p = Math.max(0, Math.min(clean.length - 1, p));

let before = words.slice(0, unit.pivotWordIndex).join(" ");
if (before) before += " ";

wordEl.style.fontSize = "96px";
const pre = clean.slice(0, p);
const mid = clean[p] || "";
const post = clean.slice(p + 1);

let after = words.slice(unit.pivotWordIndex + 1).join(" ");
if (after) after = " " + after;

wordEl.innerHTML =
`<span>${before}${pre}</span>` +
`<span class="pivot">${mid}</span>` +
`<span>${post}${after}</span>`;

// wordEl.style.fontSize = "90px";
wordEl.style.fontSize = window.innerWidth <= 768 ? "48px" : "90px";
requestAnimationFrame(alignAndScale);
}


function alignAndScale() {
const mid = wordEl.querySelector(".pivot");
if (!mid) return;

const boxWidth = focusBox.clientWidth;
const pivotX = boxWidth / 2;
const midCenter = mid.offsetLeft + mid.offsetWidth / 2;


wordEl.style.left = "0px";


wordEl.offsetWidth;

const midCenter =
mid.offsetLeft + mid.offsetWidth / 2;


wordEl.style.left = (pivotX - midCenter) + "px";

let size = 96;
while (wordEl.scrollWidth > boxWidth - 40 && size > 40) {
let size = parseFloat(getComputedStyle(wordEl).fontSize);
const minSize = window.innerWidth <= 768 ? 28 : 40;
const padding = window.innerWidth <= 768 ? 14 : 40;

while (
wordEl.scrollWidth > boxWidth - padding &&
size > minSize
) {
size -= 2;
wordEl.style.fontSize = size + "px";
wordEl.offsetWidth; // force reflow
}
}



function pacingMultiplier(text) {
let m = 1;

if (/[.!?]$/.test(text)) m *= 2.4;
else if (/[,:;]$/.test(text)) m *= 1.6;

const letters = text.replace(/\W/g, "").length;
if (letters >= 10) m *= 1.35;
else if (letters >= 7) m *= 1.2;

return m;
}


function togglePlayPause() {
if (!running) {
if (!words.length || index === 0) parseText();
if (!units.length || index === 0) parseText();
running = true;
textInput.readOnly = true;
playPauseBtn.textContent = "⏸";
Expand All @@ -129,15 +273,10 @@ function togglePlayPause() {
}
}

function punctuationDelay(word) {
if (/[.!?]$/.test(word)) return 2.4;
if (/[,:;]$/.test(word)) return 1.6;
return 1;
}

function loop() {
if (!running) return;
if (index >= words.length) {

if (index >= units.length) {
running = false;
textInput.readOnly = false;
playPauseBtn.textContent = "▶";
Expand All @@ -147,8 +286,22 @@ function loop() {
draw();

let delay = 60000 / wpmSlider.value;
delay *= punctuationDelay(words[index]);
delay *= pacingMultiplier(units[index].text);

index++;
timer = setTimeout(loop, delay);
}



function step(dir) {
if (!units.length) return;
index = Math.max(0, Math.min(units.length - 1, index + dir));
draw();
}
// mobile
focusBox.addEventListener("click", () => {
if (document.activeElement === textInput && !textInput.readOnly) return;
togglePlayPause();
});

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