plugin infrastruktur
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// ── Canvas Plugin: ASCII Art Editor ──
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//
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// Self-registers via window.hyprcrd:
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// - Markdown fenced block ```ascii``` → <pre class="ascii-art">
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// - Editor toolbar button + "asciiart" command
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// - Re-opens canvas to edit if cursor is inside an existing block
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const hyprcrd = window.hyprcrd;
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if (!hyprcrd) {
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throw new Error('[canvas plugin] window.hyprcrd not found — plugin API missing');
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}
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const $ = (id) => document.getElementById(id);
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const overlay = $('ascii-canvas-overlay');
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const grid = $('ascii-canvas-grid');
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const toolbar = $('ascii-canvas-toolbar');
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const charInput = $('ascii-char-input');
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const widthInput = $('ascii-canvas-width');
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const heightInput = $('ascii-canvas-height');
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const btnOk = $('ascii-canvas-ok');
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const btnCancel = $('ascii-canvas-cancel');
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const btnClear = $('ascii-canvas-clear');
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const btnResize = $('ascii-canvas-resize');
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const coordsDisplay = $('ascii-canvas-coords');
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let data = []; // 2D array [row][col]
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let cols = 40;
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let rows = 20;
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let tool = 'brush'; // brush | eraser | line | rect | circle | fill | text
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let char = '#';
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let drawing = false;
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let startCell = null; // {r, c} for shape tools
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let previewCells = []; // cells to highlight during drag
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let onInsert = null; // callback(text)
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let cellW = 0, cellH = 0;
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let gridRect = null;
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// ── Grid init ──
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function initGrid(w, h) {
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cols = w; rows = h;
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data = [];
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for (let r = 0; r < rows; r++) {
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data.push(new Array(cols).fill(' '));
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}
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render();
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}
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function render() {
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const lines = data.map(row => row.join(''));
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grid.textContent = lines.join('\n');
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measureCells();
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}
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function measureCells() {
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if (!grid.firstChild) return;
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// Use getBoundingClientRect on the grid (inline-block = content-sized)
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gridRect = grid.getBoundingClientRect();
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cellW = gridRect.width / cols;
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cellH = gridRect.height / rows;
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}
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function cellFromEvent(e) {
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// Always re-measure to account for scroll/layout changes
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gridRect = grid.getBoundingClientRect();
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if (!gridRect || !cellW || !cellH) return null;
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const x = e.clientX - gridRect.left;
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const y = e.clientY - gridRect.top;
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const c = Math.floor(x / cellW);
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const r = Math.floor(y / cellH);
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if (r < 0 || r >= rows || c < 0 || c >= cols) return null;
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return { r, c };
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}
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// ── Drawing algorithms ──
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function setCell(r, c, ch) {
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if (r >= 0 && r < rows && c >= 0 && c < cols) {
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data[r][c] = ch;
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}
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}
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function bresenhamLine(r0, c0, r1, c1) {
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const cells = [];
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let dr = Math.abs(r1 - r0), dc = Math.abs(c1 - c0);
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let sr = r0 < r1 ? 1 : -1, sc = c0 < c1 ? 1 : -1;
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let err = dc - dr;
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let r = r0, c = c0;
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while (true) {
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cells.push({ r, c });
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if (r === r1 && c === c1) break;
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const e2 = 2 * err;
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if (e2 > -dr) { err -= dr; c += sc; }
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if (e2 < dc) { err += dc; r += sr; }
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}
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return cells;
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}
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function rectCells(r0, c0, r1, c1) {
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const cells = [];
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const rMin = Math.min(r0, r1), rMax = Math.max(r0, r1);
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const cMin = Math.min(c0, c1), cMax = Math.max(c0, c1);
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for (let c = cMin; c <= cMax; c++) { cells.push({ r: rMin, c }); cells.push({ r: rMax, c }); }
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for (let r = rMin + 1; r < rMax; r++) { cells.push({ r, c: cMin }); cells.push({ r, c: cMax }); }
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return cells;
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}
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function circleCells(r0, c0, r1, c1) {
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const cells = [];
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const cr = (r0 + r1) / 2, cc = (c0 + c1) / 2;
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const rx = Math.abs(c1 - c0) / 2, ry = Math.abs(r1 - r0) / 2;
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if (rx < 1 && ry < 1) { cells.push({ r: Math.round(cr), c: Math.round(cc) }); return cells; }
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// Parametric ellipse
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const steps = Math.max(60, Math.round(Math.max(rx, ry) * 4));
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const seen = new Set();
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for (let i = 0; i <= steps; i++) {
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const a = (2 * Math.PI * i) / steps;
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const r = Math.round(cr + ry * Math.sin(a));
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const c = Math.round(cc + rx * Math.cos(a));
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const key = r + ',' + c;
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if (!seen.has(key)) { seen.add(key); cells.push({ r, c }); }
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}
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return cells;
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}
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function floodFill(r, c, ch) {
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const target = data[r]?.[c];
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if (target === undefined || target === ch) return;
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const stack = [{ r, c }];
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while (stack.length) {
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const { r: cr, c: cc } = stack.pop();
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if (cr < 0 || cr >= rows || cc < 0 || cc >= cols) continue;
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if (data[cr][cc] !== target) continue;
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data[cr][cc] = ch;
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stack.push({ r: cr - 1, c: cc }, { r: cr + 1, c: cc }, { r: cr, c: cc - 1 }, { r: cr, c: cc + 1 });
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}
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}
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// ── Rendering with preview overlay ──
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function renderWithPreview(cells, ch) {
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const preview = new Map();
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for (const { r, c } of cells) {
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if (r >= 0 && r < rows && c >= 0 && c < cols) {
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preview.set(r + ',' + c, ch);
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}
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}
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const lines = [];
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for (let r = 0; r < rows; r++) {
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let line = '';
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for (let c = 0; c < cols; c++) {
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const key = r + ',' + c;
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line += preview.has(key) ? preview.get(key) : data[r][c];
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}
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lines.push(line);
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}
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grid.textContent = lines.join('\n');
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}
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// ── Mouse handlers ──
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function onMouseDown(e) {
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if (e.button !== 0) return;
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e.preventDefault();
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measureCells();
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const cell = cellFromEvent(e);
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if (!cell) return;
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drawing = true;
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startCell = cell;
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if (tool === 'brush') {
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setCell(cell.r, cell.c, char);
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render();
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} else if (tool === 'eraser') {
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setCell(cell.r, cell.c, ' ');
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render();
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} else if (tool === 'fill') {
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floodFill(cell.r, cell.c, char);
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render();
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drawing = false;
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} else if (tool === 'text') {
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// Start typing at this position
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startTextMode(cell.r, cell.c);
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drawing = false;
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}
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updateCoords(cell);
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}
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function onMouseMove(e) {
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const cell = cellFromEvent(e);
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if (cell) updateCoords(cell);
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if (!drawing || !cell) return;
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if (tool === 'brush') {
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// Draw line from last position for smooth strokes
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if (startCell) {
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const cells = bresenhamLine(startCell.r, startCell.c, cell.r, cell.c);
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for (const { r, c } of cells) setCell(r, c, char);
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startCell = cell;
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}
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render();
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} else if (tool === 'eraser') {
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if (startCell) {
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const cells = bresenhamLine(startCell.r, startCell.c, cell.r, cell.c);
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for (const { r, c } of cells) setCell(r, c, ' ');
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startCell = cell;
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}
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render();
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} else if (tool === 'line') {
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const cells = bresenhamLine(startCell.r, startCell.c, cell.r, cell.c);
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renderWithPreview(cells, char);
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} else if (tool === 'rect') {
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const cells = rectCells(startCell.r, startCell.c, cell.r, cell.c);
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renderWithPreview(cells, char);
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} else if (tool === 'circle') {
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const cells = circleCells(startCell.r, startCell.c, cell.r, cell.c);
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renderWithPreview(cells, char);
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}
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}
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function onMouseUp(e) {
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if (!drawing) return;
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const cell = cellFromEvent(e);
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if (!cell) { drawing = false; return; }
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if (tool === 'line') {
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for (const p of bresenhamLine(startCell.r, startCell.c, cell.r, cell.c)) setCell(p.r, p.c, char);
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} else if (tool === 'rect') {
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for (const p of rectCells(startCell.r, startCell.c, cell.r, cell.c)) setCell(p.r, p.c, char);
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} else if (tool === 'circle') {
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for (const p of circleCells(startCell.r, startCell.c, cell.r, cell.c)) setCell(p.r, p.c, char);
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}
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drawing = false;
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render();
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}
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// ── Text mode ──
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let textCursor = null;
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function startTextMode(r, c) {
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textCursor = { r, c };
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renderTextCursor();
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}
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function renderTextCursor() {
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if (!textCursor) { render(); return; }
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// Show cursor as inverted cell
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const lines = [];
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for (let r = 0; r < rows; r++) {
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let line = '';
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for (let c = 0; c < cols; c++) {
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line += data[r][c];
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}
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lines.push(line);
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}
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// Build HTML with cursor highlight
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let html = '';
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for (let r = 0; r < rows; r++) {
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for (let c = 0; c < cols; c++) {
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const ch = data[r][c] === ' ' ? '\u00a0' : data[r][c];
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if (r === textCursor.r && c === textCursor.c) {
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html += `<span class="ascii-cursor">${ch}</span>`;
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} else {
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html += escChar(data[r][c]);
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}
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}
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if (r < rows - 1) html += '\n';
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}
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grid.innerHTML = html;
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}
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function escChar(ch) {
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if (ch === '<') return '<';
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if (ch === '>') return '>';
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if (ch === '&') return '&';
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if (ch === ' ') return ' ';
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return ch;
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}
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function handleTextKey(e) {
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if (!textCursor) return false;
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if (e.key === 'Escape') {
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textCursor = null;
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render();
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return true;
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}
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if (e.key === 'ArrowLeft') { textCursor.c = Math.max(0, textCursor.c - 1); renderTextCursor(); return true; }
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if (e.key === 'ArrowRight') { textCursor.c = Math.min(cols - 1, textCursor.c + 1); renderTextCursor(); return true; }
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if (e.key === 'ArrowUp') { textCursor.r = Math.max(0, textCursor.r - 1); renderTextCursor(); return true; }
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if (e.key === 'ArrowDown') { textCursor.r = Math.min(rows - 1, textCursor.r + 1); renderTextCursor(); return true; }
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if (e.key === 'Backspace') {
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textCursor.c = Math.max(0, textCursor.c - 1);
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setCell(textCursor.r, textCursor.c, ' ');
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renderTextCursor();
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return true;
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}
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if (e.key === 'Enter') {
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textCursor.r = Math.min(rows - 1, textCursor.r + 1);
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textCursor.c = 0;
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renderTextCursor();
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return true;
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}
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if (e.key.length === 1 && !e.ctrlKey && !e.metaKey) {
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setCell(textCursor.r, textCursor.c, e.key);
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textCursor.c = Math.min(cols - 1, textCursor.c + 1);
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renderTextCursor();
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return true;
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}
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return false;
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}
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// ── Coords display ──
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function updateCoords(cell) {
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if (coordsDisplay) coordsDisplay.textContent = `${cell.c + 1}:${cell.r + 1}`;
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}
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// ── Tool selection ──
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function selectTool(t) {
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tool = t;
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textCursor = null;
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render();
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toolbar.querySelectorAll('[data-tool]').forEach(b => {
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b.classList.toggle('active', b.dataset.tool === t);
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});
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}
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// ── Character palette ──
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const CHAR_SETS = {
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basic: ['#', '*', '.', '+', '-', '|', '/', '\\', '=', '_', '~', ':', '^', '@', 'o', 'x'],
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box: ['─', '│', '┌', '┐', '└', '┘', '├', '┤', '┬', '┴', '┼'],
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boxDouble: ['═', '║', '╔', '╗', '╚', '╝', '╠', '╣', '╦', '╩', '╬'],
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blocks: ['█', '▓', '▒', '░', '▄', '▀', '▌', '▐'],
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arrows: ['←', '→', '↑', '↓', '↔', '↕', '►', '◄', '▲', '▼'],
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};
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function buildPalette() {
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const palette = $('ascii-char-palette');
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if (!palette) return;
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palette.innerHTML = '';
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for (const [group, chars] of Object.entries(CHAR_SETS)) {
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const grp = document.createElement('div');
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grp.className = 'ascii-char-group';
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for (const ch of chars) {
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const btn = document.createElement('button');
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btn.className = 'ascii-char-btn';
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btn.textContent = ch;
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btn.title = ch;
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btn.addEventListener('click', () => {
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char = ch;
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charInput.value = ch;
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palette.querySelectorAll('.ascii-char-btn').forEach(b => b.classList.remove('active'));
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btn.classList.add('active');
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});
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if (ch === char) btn.classList.add('active');
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grp.appendChild(btn);
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}
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palette.appendChild(grp);
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}
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}
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// ── Export ──
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function exportText() {
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// Trim trailing spaces per line, remove trailing empty lines
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const lines = data.map(row => row.join('').replace(/\s+$/, ''));
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while (lines.length > 1 && !lines[lines.length - 1]) lines.pop();
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return lines.join('\n');
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}
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// ── Open / Close ──
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export function openCanvas(callback, existingText) {
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onInsert = callback;
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if (existingText) {
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// Parse existing canvas content
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const lines = existingText.split('\n');
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rows = Math.max(lines.length, 5);
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cols = Math.max(...lines.map(l => l.length), 20);
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heightInput.value = rows;
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widthInput.value = cols;
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data = [];
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for (let r = 0; r < rows; r++) {
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const row = [];
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const line = lines[r] || '';
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for (let c = 0; c < cols; c++) {
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row.push(c < line.length ? line[c] : ' ');
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}
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data.push(row);
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}
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} else {
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// Auto-fit to available grid container space
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overlay.classList.add('open');
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const container = grid.parentElement;
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requestAnimationFrame(() => {
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const style = getComputedStyle(grid);
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// Measure one character by rendering a single char
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grid.textContent = 'M';
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const charW = grid.getBoundingClientRect().width;
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const charH = grid.getBoundingClientRect().height;
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grid.textContent = '';
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if (charW > 0 && charH > 0) {
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const pad = parseFloat(getComputedStyle(container).paddingLeft) * 2;
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cols = Math.max(20, Math.floor((container.clientWidth - pad) / charW));
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rows = Math.max(5, Math.floor((container.clientHeight - pad) / charH));
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} else {
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cols = 80;
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rows = 30;
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}
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widthInput.value = cols;
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heightInput.value = rows;
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initGrid(cols, rows);
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buildPalette();
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selectTool('brush');
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measureCells();
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});
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return;
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}
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buildPalette();
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selectTool('brush');
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overlay.classList.add('open');
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render();
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requestAnimationFrame(() => measureCells());
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}
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function closeCanvas() {
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overlay.classList.remove('open');
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textCursor = null;
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drawing = false;
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onInsert = null;
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}
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// ── Event binding ──
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function init() {
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if (!overlay) return;
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grid.addEventListener('mousedown', onMouseDown);
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window.addEventListener('mousemove', onMouseMove);
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window.addEventListener('mouseup', onMouseUp);
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// Keyboard for text tool + tool shortcuts
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overlay.addEventListener('keydown', e => {
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if (textCursor && handleTextKey(e)) { e.preventDefault(); e.stopPropagation(); return; }
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if (e.key === 'Escape') { closeCanvas(); e.stopPropagation(); return; }
|
||||
if (e.ctrlKey || e.metaKey) return;
|
||||
const shortcuts = { b: 'brush', e: 'eraser', l: 'line', r: 'rect', o: 'circle', f: 'fill', t: 'text' };
|
||||
if (shortcuts[e.key]) { selectTool(shortcuts[e.key]); e.preventDefault(); }
|
||||
});
|
||||
|
||||
// Tool buttons
|
||||
toolbar.addEventListener('click', e => {
|
||||
const btn = e.target.closest('[data-tool]');
|
||||
if (btn) selectTool(btn.dataset.tool);
|
||||
});
|
||||
|
||||
// Char input
|
||||
charInput.addEventListener('input', () => {
|
||||
if (charInput.value.length > 0) {
|
||||
char = charInput.value[charInput.value.length - 1];
|
||||
charInput.value = char;
|
||||
// Update palette highlight
|
||||
const palette = $('ascii-char-palette');
|
||||
palette?.querySelectorAll('.ascii-char-btn').forEach(b => {
|
||||
b.classList.toggle('active', b.textContent === char);
|
||||
});
|
||||
}
|
||||
});
|
||||
|
||||
// OK button
|
||||
btnOk.addEventListener('click', () => {
|
||||
const text = exportText();
|
||||
if (onInsert && text.trim()) onInsert(text);
|
||||
closeCanvas();
|
||||
});
|
||||
|
||||
// Cancel
|
||||
btnCancel.addEventListener('click', closeCanvas);
|
||||
|
||||
// Clear
|
||||
btnClear.addEventListener('click', () => {
|
||||
initGrid(cols, rows);
|
||||
});
|
||||
|
||||
// Resize
|
||||
btnResize.addEventListener('click', () => {
|
||||
const newW = parseInt(widthInput.value) || cols;
|
||||
const newH = parseInt(heightInput.value) || rows;
|
||||
// Preserve existing content
|
||||
const oldData = data;
|
||||
const oldRows = rows, oldCols = cols;
|
||||
cols = Math.max(5, Math.min(200, newW));
|
||||
rows = Math.max(3, Math.min(100, newH));
|
||||
widthInput.value = cols;
|
||||
heightInput.value = rows;
|
||||
data = [];
|
||||
for (let r = 0; r < rows; r++) {
|
||||
const row = [];
|
||||
for (let c = 0; c < cols; c++) {
|
||||
row.push(r < oldRows && c < oldCols ? oldData[r][c] : ' ');
|
||||
}
|
||||
data.push(row);
|
||||
}
|
||||
render();
|
||||
});
|
||||
|
||||
// Close on overlay background click
|
||||
overlay.addEventListener('click', e => {
|
||||
if (e.target === overlay) closeCanvas();
|
||||
});
|
||||
}
|
||||
|
||||
init();
|
||||
|
||||
// ── Plugin self-registration ──────────────────────────────────────
|
||||
|
||||
// Register markdown fenced block: ```ascii``` → styled <pre>
|
||||
hyprcrd.markdown.registerFencedBlock('ascii', (content, { esc }) => {
|
||||
return `<pre class="ascii-art">${esc(content.replace(/\s+$/, ''))}</pre>`;
|
||||
});
|
||||
|
||||
// Register editor toolbar command "asciiart"
|
||||
hyprcrd.editor.registerCommand('asciiart', () => {
|
||||
const ed = hyprcrd.editor.api;
|
||||
if (!ed || !ed.body) return;
|
||||
const body = ed.body;
|
||||
|
||||
// Detect if cursor is inside an existing ```ascii``` block (edit mode)
|
||||
const val = body.value;
|
||||
const pos = body.selectionStart;
|
||||
const before = val.substring(0, pos);
|
||||
const blockStart = before.lastIndexOf('```ascii\n');
|
||||
const blockEndInBefore = blockStart >= 0 ? before.indexOf('\n```', blockStart + 9) : -1;
|
||||
let existingText = null, replaceStart = 0, replaceEnd = 0;
|
||||
if (blockStart >= 0 && blockEndInBefore < 0) {
|
||||
const contentStart = blockStart + 9;
|
||||
const endMark = val.indexOf('\n```', contentStart);
|
||||
if (endMark >= 0) {
|
||||
existingText = val.substring(contentStart, endMark);
|
||||
replaceStart = blockStart;
|
||||
replaceEnd = endMark + 4;
|
||||
}
|
||||
}
|
||||
|
||||
openCanvas(text => {
|
||||
const block = '```ascii\n' + text + '\n```';
|
||||
if (existingText !== null) {
|
||||
body.setRangeText(block, replaceStart, replaceEnd, 'end');
|
||||
} else {
|
||||
const s = body.selectionStart;
|
||||
const prefix = s > 0 && val[s - 1] !== '\n' ? '\n' : '';
|
||||
body.setRangeText(prefix + block + '\n', s, body.selectionEnd, 'end');
|
||||
}
|
||||
ed.updatePreview?.();
|
||||
}, existingText);
|
||||
});
|
||||
|
||||
// Inject toolbar button into #md-toolbar (after the "extract" button if present)
|
||||
function injectToolbarButton() {
|
||||
const toolbar = $('md-toolbar');
|
||||
if (!toolbar) return;
|
||||
if (toolbar.querySelector('[data-md="asciiart"]')) return; // already injected
|
||||
const btn = document.createElement('button');
|
||||
btn.setAttribute('data-md', 'asciiart');
|
||||
btn.setAttribute('title', 'ASCII Canvas');
|
||||
btn.className = 'toolbar-btn';
|
||||
btn.innerHTML = '<i class="ph ph-grid-four text-sm"></i>';
|
||||
// Insert before the right-side spacer (flex-1 div), or append at end
|
||||
const spacer = toolbar.querySelector('.flex-1');
|
||||
if (spacer) toolbar.insertBefore(btn, spacer);
|
||||
else toolbar.appendChild(btn);
|
||||
}
|
||||
if (document.readyState === 'loading') {
|
||||
document.addEventListener('DOMContentLoaded', injectToolbarButton);
|
||||
} else {
|
||||
injectToolbarButton();
|
||||
}
|
||||
|
||||
// Register plugin metadata for introspection
|
||||
hyprcrd.registerPlugin({
|
||||
name: 'canvas',
|
||||
version: '1.0.0',
|
||||
description: 'ASCII art canvas editor',
|
||||
});
|
||||
Reference in new issue
Block a user