unicode-canvas/unicode-canvas.html at main · reagent-systems/unicode-canvas · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Unicode Art Canvas</title>
  <style>
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    body { background: #fff; color: #111; font-family: monospace; min-height: 100vh; padding: 20px; box-sizing: border-box; }
    h1 { font-size: 15px; font-weight: 500; letter-spacing: 0.05em; margin-bottom: 14px; opacity: 0.45; }
    #toolbar { display: none; align-items: center; gap: 18px; margin-bottom: 10px; flex-wrap: wrap; }
    #toolbar label { font-size: 12px; opacity: 0.6; display: flex; align-items: center; gap: 5px; }
    #toolbar input[type=range] { width: 80px; accent-color: #111; }
    #toolbar span.val { font-size: 12px; font-weight: 600; min-width: 20px; opacity: 1; }
    #toolbar button {
      font-size: 12px; font-family: monospace;
      padding: 3px 11px; border: 1px solid #ccc;
      border-radius: 6px; background: #fff; color: #111; cursor: pointer;
    }
    #toolbar button:hover { background: #f0f0f0; }
    #status { font-size: 11px; opacity: 0.38; margin-bottom: 6px; min-height: 15px; letter-spacing: 0.02em; }

    #group-bar {
      display: none; gap: 4px; margin-bottom: 8px;
      flex-wrap: wrap; align-items: center;
    }
    .group-pill {
      font-size: 10px; font-family: monospace;
      padding: 2px 9px; border-radius: 10px;
      border: 1px solid #ddd; color: #bbb;
      cursor: pointer; user-select: none;
      transition: background 0.12s, color 0.12s, border-color 0.12s;
    }
    .group-pill:hover { border-color: #999; color: #777; }
    /* selected = included in active cycling set */
    .group-pill.selected { background: #111; color: #fff; border-color: #111; }
    .group-pill.selected:hover { background: #333; border-color: #333; }
    /* "all" pill gets a separator after it */
    #pill-all { font-weight: 700; margin-right: 4px; }
    /* which group the needle is currently inside while cycling */
    .group-pill.cycling { box-shadow: 0 0 0 2px #888; }

    #loading {
      display: flex; flex-direction: column; align-items: center; justify-content: center;
      padding: 56px 24px; gap: 14px; border: 1px solid #e0e0e0; border-radius: 10px;
    }
    #loading-label { font-size: 13px; opacity: 0.5; }
    #progress-bar-wrap { width: 280px; height: 3px; background: #eee; border-radius: 2px; overflow: hidden; }
    #progress-bar { height: 100%; width: 0%; background: #111; border-radius: 2px; transition: width 0.1s; }
    #progress-pct { font-size: 11px; opacity: 0.35; }

    #canvas-wrap {
      display: none; border: 1px solid #e0e0e0; border-radius: 10px;
      overflow: auto; background: #fff; cursor: crosshair;
      max-height: 75vh; padding: 6px; user-select: none;
      width: 100%;
    }
    #art-grid { display: block; line-height: 1; }
    .art-row { display: block; white-space: nowrap; overflow: hidden; }
    .cell {
      display: inline-block; width: 1ch; line-height: 1.35; height: 1.35em;
      font-family: monospace; text-align: center; vertical-align: top;
      overflow: hidden; color: #000;
    }
    .tooltip {
      position: fixed; background: #fff; border: 1px solid #ccc; border-radius: 7px;
      padding: 5px 10px; font-size: 11px; color: #555; pointer-events: none;
      z-index: 100; white-space: nowrap; display: none; font-family: monospace;
    }
  </style>
</head>
<body>
  <h1>unicode art canvas</h1>
  <div id="toolbar">
    <label>font <input type="range" id="fontSlider" min="8" max="32" value="14" step="1"> <span class="val" id="fontVal">14</span>px</label>
    <label>rows <input type="range" id="rowsSlider" min="3" max="60" value="20" step="1"> <span class="val" id="rowsVal">20</span></label>
    <label>speed <input type="range" id="speedSlider" min="1" max="10" value="4" step="1"> <span class="val" id="speedVal">4</span></label>
    <button id="clearBtn">clear</button>
    <button id="randomBtn">scatter</button>
    <button id="loopBtn">loop: on</button>
    <button id="copyBtn">copy text</button>
  </div>
  <div id="group-bar"></div>
  <div id="status"></div>
  <div id="loading">
    <div id="loading-label">measuring pixel density of every terminal glyph…</div>
    <div id="progress-bar-wrap"><div id="progress-bar"></div></div>
    <div id="progress-pct">0%</div>
  </div>
  <div id="canvas-wrap"><div id="art-grid"></div></div>
  <div class="tooltip" id="tooltip"></div>

<script>
(function () {
  // ── Character group definitions ───────────────────────────────────────────
  const GROUP_DEFS = [
    { name: 'space',         ranges: [[0x0020, 0x0020]] },
    { name: 'dots & dashes', codepoints: [0x2E,0x2C,0x27,0x60,0x2D,0x5F,0x3A,0x3B,0x7C,0x21,0x7E,0x22,0x5E] },
    { name: 'ascii symbols', codepoints: [0x23,0x24,0x25,0x26,0x28,0x29,0x2A,0x2B,0x2F,0x3C,0x3D,0x3E,0x3F,0x40,0x5B,0x5C,0x5D,0x7B,0x7D] },
    { name: 'digits',        ranges: [[0x30, 0x39]] },
    { name: 'lowercase',     ranges: [[0x61, 0x7A]] },
    { name: 'uppercase',     ranges: [[0x41, 0x5A]] },
    { name: 'latin ext',     ranges: [[0x00A1, 0x00FF]] },
    { name: 'arrows & math', ranges: [[0x2190, 0x21FF], [0x2200, 0x22FF], [0x2300, 0x23FF]] },
    { name: 'box light',     ranges: [[0x2500, 0x254F]] },
    { name: 'box heavy',     ranges: [[0x2550, 0x257F]] },
    { name: 'geometric',     ranges: [[0x25A0, 0x25FF]] },
    { name: 'braille',       ranges: [[0x2800, 0x28FF]] },
    { name: 'blocks',        ranges: [[0x2580, 0x259F]] },
  ];

  // Build raw char lists per group
  const groups = GROUP_DEFS.map(def => {
    const chars = [], seen = new Set();
    function add(cp) {
      if (seen.has(cp)) return; seen.add(cp);
      try { chars.push({ cp, ch: String.fromCodePoint(cp) }); } catch(e) {}
    }
    if (def.ranges) def.ranges.forEach(([s, e]) => { for (let c = s; c <= e; c++) add(c); });
    if (def.codepoints) def.codepoints.forEach(add);
    return { name: def.name, chars };
  });

  // ── Measurement ───────────────────────────────────────────────────────────
  const CSIZE = 20;
  const mCanvas = document.createElement('canvas');
  mCanvas.width = CSIZE; mCanvas.height = CSIZE;
  const mCtx = mCanvas.getContext('2d', { willReadFrequently: true });
  mCtx.textAlign = 'center'; mCtx.textBaseline = 'middle';
  mCtx.font = `${CSIZE - 2}px monospace`;

  function measureChar(ch) {
    mCtx.clearRect(0, 0, CSIZE, CSIZE);
    mCtx.fillStyle = 'black';
    mCtx.fillText(ch, CSIZE / 2, CSIZE / 2);
    const data = mCtx.getImageData(0, 0, CSIZE, CSIZE).data;
    let px = 0;
    for (let j = 3; j < data.length; j += 4) if (data[j] > 8) px++;
    return px;
  }

  async function measureAll() {
    const total = groups.reduce((s, g) => s + g.chars.length, 0);
    let done = 0;
    for (const group of groups) {
      const measured = [];
      for (let i = 0; i < group.chars.length; i++) {
        const { cp, ch } = group.chars[i];
        measured.push({ cp, ch, px: measureChar(ch) });
        done++;
        if (i % 300 === 0) {
          const pct = Math.min(100, Math.round(done / total * 100));
          document.getElementById('progress-bar').style.width = pct + '%';
          document.getElementById('progress-pct').textContent = pct + '%';
          await new Promise(r => setTimeout(r, 0));
        }
      }
      measured.sort((a, b) => a.px - b.px || a.cp - b.cp);
      group.chars = measured;
    }
    document.getElementById('progress-bar').style.width = '100%';
    document.getElementById('progress-pct').textContent = '100%';
    await new Promise(r => setTimeout(r, 0));
  }

  // ── State ────────────────────────────────────────────────────────────────
  const artGrid  = document.getElementById('art-grid');
  const statusEl = document.getElementById('status');
  const tooltip  = document.getElementById('tooltip');
  const toolbar  = document.getElementById('toolbar');
  const wrap     = document.getElementById('canvas-wrap');
  const groupBar = document.getElementById('group-bar');

  let cols = 10, rows = 20, speed = 4, fontSize = 14;
  let cells = [], cellData = [];
  let activeIdx = -1, activeTimer = null, mouseDown = false;
  let loopMode = true;

  // Selection state: Set of group indices that are "on"
  // null means ALL mode (all groups on, toggled via the "all" pill)
  let selectedGroups = new Set(groups.map((_, i) => i)); // start: all selected
  let allMode = true; // true = "all" pill is active

  // The active cycling sequence (flat array, rebuilt when selection changes)
  let sequence = [];

  function buildSequence() {
    sequence = [];
    const active = allMode ? groups.map((_, i) => i) : [...selectedGroups].sort((a,b)=>a-b);
    active.forEach(gi => {
      groups[gi].chars.forEach(({ cp, ch, px }) => {
        sequence.push({ cp, ch, px, groupIdx: gi, groupName: groups[gi].name });
      });
    });
  }

  // ── Group pill bar ────────────────────────────────────────────────────────
  let pillEls = [];   // indexed by group index
  let allPillEl;
  let cyclingPill = -1; // which group pill has the cycling ring

  function buildGroupBar() {
    groupBar.innerHTML = '';
    pillEls = [];

    // "all" pill
    allPillEl = document.createElement('span');
    allPillEl.className = 'group-pill all-pill selected';
    allPillEl.id = 'pill-all';
    allPillEl.textContent = 'all';
    allPillEl.title = 'cycle through all groups';
    allPillEl.addEventListener('click', () => {
      allMode = true;
      selectedGroups = new Set(groups.map((_, i) => i));
      allPillEl.classList.add('selected');
      pillEls.forEach(p => p.classList.add('selected'));
      buildSequence();
      // reset cells that were mid-cycle
      resetCellProgress();
    });
    groupBar.appendChild(allPillEl);

    // Individual group pills
    groups.forEach((g, gi) => {
      const pill = document.createElement('span');
      pill.className = 'group-pill selected'; // start all selected
      pill.textContent = g.name;
      pill.title = `${g.chars.length} chars`;
      pill.addEventListener('click', () => {
        if (selectedGroups.has(gi)) {
          // Deselect — but keep at least one
          if (selectedGroups.size <= 1) return;
          selectedGroups.delete(gi);
          pill.classList.remove('selected');
        } else {
          selectedGroups.add(gi);
          pill.classList.add('selected');
        }
        // If not all are selected, turn off allMode
        allMode = selectedGroups.size === groups.length;
        if (allMode) allPillEl.classList.add('selected');
        else allPillEl.classList.remove('selected');
        buildSequence();
        resetCellProgress();
      });
      groupBar.appendChild(pill);
      pillEls.push(pill);
    });

    groupBar.style.display = 'flex';
  }

  function setCyclingPill(groupIdx) {
    if (cyclingPill === groupIdx) return;
    if (cyclingPill >= 0 && pillEls[cyclingPill]) pillEls[cyclingPill].classList.remove('cycling');
    cyclingPill = groupIdx;
    if (groupIdx >= 0 && pillEls[groupIdx]) pillEls[groupIdx].classList.add('cycling');
  }

  function clearCyclingPill() {
    if (cyclingPill >= 0 && pillEls[cyclingPill]) pillEls[cyclingPill].classList.remove('cycling');
    cyclingPill = -1;
  }

  // ── Grid ──────────────────────────────────────────────────────────────────
  function computeColsFit() {
    artGrid.style.fontSize = fontSize + 'px';
    const probe = document.createElement('span');
    probe.className = 'cell';
    probe.textContent = ' ';
    probe.setAttribute('aria-hidden', 'true');
    Object.assign(probe.style, {
      position: 'absolute',
      visibility: 'hidden',
      pointerEvents: 'none',
      left: '-9999px',
      top: '0',
    });
    artGrid.appendChild(probe);
    const cellW = Math.max(4, probe.getBoundingClientRect().width);
    probe.remove();
    const cw = wrap.clientWidth;
    const cs = window.getComputedStyle(wrap);
    const pad =
      parseFloat(cs.paddingLeft) + parseFloat(cs.paddingRight);
    const inner = Math.max(0, cw - pad);
    const MIN_COLS = 10;
    const MAX_COLS = 400;
    return Math.min(MAX_COLS, Math.max(MIN_COLS, Math.floor(inner / cellW)));
  }

  function buildGrid() {
    stopActive();
    cols = computeColsFit();
    artGrid.innerHTML = '';
    cells = []; cellData = [];
    artGrid.style.fontSize = fontSize + 'px';
    for (let r = 0; r < rows; r++) {
      const row = document.createElement('div');
      row.className = 'art-row';
      for (let c = 0; c < cols; c++) {
        const el = document.createElement('span');
        el.className = 'cell';
        el.textContent = ' ';
        row.appendChild(el);
        cells.push(el);
        cellData.push({ charIdx: 0 });
      }
      artGrid.appendChild(row);
    }
  }

  function resetCellProgress() {
    // Sequence changed — reset charIdx so next paint starts from 0,
    // but never touch the displayed character (keep the canvas as-is).
    cellData.forEach(d => { d.charIdx = 0; });
  }

  function stopActive() {
    if (activeTimer) { clearTimeout(activeTimer); activeTimer = null; }
    activeIdx = -1;
    clearCyclingPill();
  }

  function startCell(idx) {
    if (idx === activeIdx) return;
    stopActive();
    if (idx < 0 || sequence.length === 0) return;
    activeIdx = idx;
    const interval = Math.max(16, 200 - speed * 18);
    function tick() {
      if (activeIdx !== idx) return;
      const TOTAL = sequence.length;
      const d = cellData[idx];
      const el = cells[idx];
      const next = d.charIdx + Math.max(1, Math.ceil(TOTAL / 800 * (speed / 3)));
      if (!loopMode && next >= TOTAL) {
        d.charIdx = TOTAL - 1;
        const sc = sequence[d.charIdx];
        el.textContent = sc.ch;
        setCyclingPill(sc.groupIdx);
        statusEl.textContent = `[${sc.groupName}]  U+${sc.cp.toString(16).toUpperCase().padStart(4,'0')}  ·  ${sc.px}px  ·  ${(d.charIdx+1).toLocaleString()} / ${TOTAL.toLocaleString()}`;
        stopActive();
        return;
      }
      d.charIdx = next % TOTAL;
      const sc = sequence[d.charIdx];
      el.textContent = sc.ch;
      setCyclingPill(sc.groupIdx);
      statusEl.textContent = `[${sc.groupName}]  U+${sc.cp.toString(16).toUpperCase().padStart(4,'0')}  ·  ${sc.px}px  ·  ${(d.charIdx+1).toLocaleString()} / ${TOTAL.toLocaleString()}`;
      activeTimer = setTimeout(tick, interval);
    }
    tick();
  }

  function idxAt(x, y) {
    const el = document.elementFromPoint(x, y);
    if (!el || !el.classList.contains('cell')) return -1;
    return cells.indexOf(el);
  }

  // ── Events ────────────────────────────────────────────────────────────────
  wrap.addEventListener('mousedown', e => { mouseDown = true; startCell(idxAt(e.clientX, e.clientY)); });
  wrap.addEventListener('mousemove', e => {
    const i = idxAt(e.clientX, e.clientY);
    if (mouseDown) startCell(i);
    if (i >= 0) {
      const d = cellData[i];
      const sc = sequence[Math.max(0, Math.min(d.charIdx, sequence.length - 1))];
      tooltip.style.display = 'block';
      tooltip.style.left = (e.clientX + 14) + 'px';
      tooltip.style.top  = (e.clientY - 28) + 'px';
      tooltip.textContent = (d.charIdx > 0 && sc)
        ? `[${sc.groupName}]  U+${sc.cp.toString(16).toUpperCase().padStart(4,'0')}  ·  ${sc.px}px`
        : 'hold to paint';
    } else { tooltip.style.display = 'none'; }
  });
  document.addEventListener('mouseup', () => { mouseDown = false; stopActive(); });
  wrap.addEventListener('mouseleave', () => { tooltip.style.display = 'none'; if (mouseDown) stopActive(); });
  wrap.addEventListener('touchstart', e => { e.preventDefault(); mouseDown=true; const t=e.touches[0]; startCell(idxAt(t.clientX,t.clientY)); }, {passive:false});
  wrap.addEventListener('touchmove',  e => { e.preventDefault(); const t=e.touches[0]; startCell(idxAt(t.clientX,t.clientY)); }, {passive:false});
  wrap.addEventListener('touchend',   () => { mouseDown=false; stopActive(); });

  document.getElementById('clearBtn').addEventListener('click', () => {
    buildGrid(); statusEl.textContent=''; clearCyclingPill();
  });
  document.getElementById('randomBtn').addEventListener('click', () => {
    const TOTAL = sequence.length;
    if (!TOTAL) return;
    [...Array(rows*cols).keys()].sort(()=>Math.random()-0.5)
      .slice(0, Math.floor(rows*cols*0.4))
      .forEach((idx,i) => setTimeout(() => {
        if (true) {
          cellData[idx].charIdx = Math.floor(Math.random() * TOTAL);
          cells[idx].textContent = sequence[cellData[idx].charIdx].ch;
        }
      }, i * 8));
  });
  document.getElementById('copyBtn').addEventListener('click', () => {
    const lines = [];
    for (let r = 0; r < rows; r++) {
      let line = '';
      for (let c = 0; c < cols; c++) line += cells[r * cols + c].textContent;
      lines.push(line);
    }
    navigator.clipboard.writeText(lines.join('\n')).then(() => {
      const btn = document.getElementById('copyBtn');
      btn.textContent = 'copied!';
      setTimeout(() => btn.textContent = 'copy text', 1500);
    });
  });

  document.getElementById('loopBtn').addEventListener('click', () => {
    loopMode = !loopMode;
    document.getElementById('loopBtn').textContent = loopMode ? 'loop: on' : 'loop: off';
    document.getElementById('loopBtn').style.opacity = loopMode ? '1' : '0.45';
  });

  document.getElementById('rowsSlider').addEventListener('input', function(){ rows=+this.value; document.getElementById('rowsVal').textContent=rows; buildGrid(); });
  document.getElementById('speedSlider').addEventListener('input', function(){ speed=+this.value; document.getElementById('speedVal').textContent=speed; });
  document.getElementById('fontSlider').addEventListener('input', function(){ fontSize=+this.value; document.getElementById('fontVal').textContent=fontSize; buildGrid(); });

  // ── Boot ──────────────────────────────────────────────────────────────────
  measureAll().then(() => {
    buildSequence();
    document.getElementById('loading').style.display = 'none';
    toolbar.style.display = 'flex';
    wrap.style.display = 'block';
    buildGroupBar();
    buildGrid();

    new ResizeObserver(() => {
      if (wrap.clientWidth <= 0) return;
      requestAnimationFrame(() => {
        const next = computeColsFit();
        if (next === cols) return;
        buildGrid();
      });
    }).observe(wrap);

    const minPx = sequence[0].px, maxPx = sequence[sequence.length-1].px;
    statusEl.textContent = `ready · ${sequence.length.toLocaleString()} glyphs · ${groups.length} groups · ${minPx}px → ${maxPx}px`;
  });
})();
</script>
</body>
</html>