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(function () { |
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'use strict'; |
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|
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function typoCssVarsForEl(typo, prefix, el) { |
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if (!typo || typeof typo !== 'object') return; |
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var m = { family:'font-family', weight:'font-weight', transform:'text-transform', style:'font-style', decoration:'text-decoration', |
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sizeDesktop:'font-size-d', sizeTablet:'font-size-t', sizeMobile:'font-size-m', |
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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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Object.keys(m).forEach(function (k) { |
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if (typo[k] !== undefined && typo[k] !== '') { |
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var v = typo[k], u = typo[k + 'Unit'] || ''; |
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if (/Desktop|Tablet|Mobile/.test(k) && typeof v === 'number') v = v + (u || 'px'); |
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el.style.setProperty(prefix + m[k], '' + v); |
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} |
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}); |
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} |
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|
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var PRESET_PALETTE = [ |
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'#000000', '#374151', '#6b7280', '#d1d5db', |
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'#ffffff', '#ef4444', '#f97316', '#eab308', |
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'#22c55e', '#06b6d4', '#6366f1', '#a855f7' |
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]; |
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|
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var MAX_HISTORY = 40; |
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|
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function initBlock(root) { |
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var optsRaw = root.getAttribute('data-opts'); |
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var opts; |
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try { opts = JSON.parse(optsRaw); } catch (e) { opts = {}; } |
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|
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var accent = opts.accentColor || '#6366f1'; |
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var canvW = opts.canvasWidth || 800; |
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var canvH = opts.canvasHeight || 480; |
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var defTool = opts.defaultTool || 'pen'; |
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var defColor = opts.defaultColor || '#1e1b4b'; |
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var defLineWidth = opts.defaultLineWidth || 4; |
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var showGrid = !!opts.showGrid; |
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var bgColor = opts.backgroundColor || '#ffffff'; |
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var gridCol = opts.gridColor || '#e5e7eb'; |
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var titleColor = opts.titleColor || '#1e1b4b'; |
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var sectionBg = opts.sectionBg || '#f8fafc'; |
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|
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if (sectionBg) root.style.background = sectionBg; |
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root.style.setProperty('--bkbg-drw-accent', accent); |
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root.style.setProperty('--bkbg-drw-ttl-fs', (opts.fontSize || 26) + 'px'); |
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root.style.setProperty('--bkbg-drw-sub-fs', (opts.subtitleSize || 14) + 'px'); |
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typoCssVarsForEl(opts.typoTitle, '--bkbg-drw-ttl-', root); |
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typoCssVarsForEl(opts.typoSubtitle, '--bkbg-drw-sub-', root); |
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|
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var titleEl = root.querySelector('.bkbg-drw-title'); |
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if (titleEl) { titleEl.style.color = titleColor; } |
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var subEl = root.querySelector('.bkbg-drw-subtitle'); |
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if (subEl) { subEl.style.color = titleColor; } |
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|
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// ---- State ---- |
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var tool = defTool; |
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var color = defColor; |
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var lineWidth = defLineWidth; |
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var isDrawing = false; |
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var startX = 0, startY = 0; |
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var history = []; |
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var snapshot = null; // imageData snapshot for shape preview during drag |
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|
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// ---- Build DOM ---- |
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var app = document.createElement('div'); |
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|
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// Toolbar |
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var toolbarEl; |
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if (opts.showToolbar !== false) { |
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toolbarEl = document.createElement('div'); |
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toolbarEl.className = 'bkbg-drw-toolbar'; |
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app.appendChild(toolbarEl); |
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} |
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|
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// Canvas wrapper + canvas |
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var wrap = document.createElement('div'); |
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wrap.className = 'bkbg-drw-canvas-wrap'; |
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|
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var canvas = document.createElement('canvas'); |
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canvas.className = 'bkbg-drw-canvas'; |
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canvas.width = canvW; |
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canvas.height = canvH; |
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canvas.style.background = bgColor; |
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wrap.appendChild(canvas); |
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app.appendChild(wrap); |
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|
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// Action bar |
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var actionsEl = document.createElement('div'); |
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actionsEl.className = 'bkbg-drw-actions'; |
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app.appendChild(actionsEl); |
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|
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root.appendChild(app); |
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|
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var ctx = canvas.getContext('2d'); |
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ctx.lineCap = 'round'; |
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ctx.lineJoin = 'round'; |
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|
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// ---- Grid ---- |
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function drawGrid() { |
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if (!showGrid) return; |
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var step = 20; |
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ctx.save(); |
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ctx.strokeStyle = gridCol; |
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ctx.lineWidth = 0.5; |
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ctx.globalAlpha = 0.5; |
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for (var x = step; x < canvW; x += step) { |
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ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, canvH); ctx.stroke(); |
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} |
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for (var y = step; y < canvH; y += step) { |
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ctx.beginPath(); ctx.moveTo(0, y); ctx.lineTo(canvW, y); ctx.stroke(); |
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} |
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ctx.restore(); |
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} |
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|
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// ---- Init canvas ---- |
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function initCanvas() { |
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ctx.fillStyle = bgColor; |
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ctx.fillRect(0, 0, canvW, canvH); |
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drawGrid(); |
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} |
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initCanvas(); |
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|
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// ---- History ---- |
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function saveHistory() { |
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if (history.length >= MAX_HISTORY) history.shift(); |
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history.push(ctx.getImageData(0, 0, canvW, canvH)); |
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} |
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|
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function undo() { |
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if (!history.length) return; |
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ctx.putImageData(history.pop(), 0, 0); |
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} |
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|
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// ---- Coordinate helper ---- (accounts for canvas CSS scaling) |
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function getPos(e) { |
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var rect = canvas.getBoundingClientRect(); |
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var scaleX = canvW / rect.width; |
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var scaleY = canvH / rect.height; |
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var src = e.touches ? e.touches[0] : e; |
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return { |
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x: (src.clientX - rect.left) * scaleX, |
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y: (src.clientY - rect.top) * scaleY |
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}; |
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} |
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|
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// ---- Drawing helpers ---- |
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function applyTool(x, y) { |
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ctx.strokeStyle = tool === 'eraser' ? bgColor : color; |
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ctx.lineWidth = lineWidth; |
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ctx.globalAlpha = tool === 'marker' ? 0.45 : 1; |
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ctx.lineTo(x, y); |
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ctx.stroke(); |
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} |
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|
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function drawShape(x, y) { |
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if (!snapshot) return; |
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ctx.putImageData(snapshot, 0, 0); |
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ctx.strokeStyle = color; |
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ctx.lineWidth = lineWidth; |
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ctx.globalAlpha = 1; |
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if (tool === 'line') { |
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ctx.beginPath(); |
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ctx.moveTo(startX, startY); |
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ctx.lineTo(x, y); |
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ctx.stroke(); |
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} else if (tool === 'rect') { |
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ctx.beginPath(); |
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ctx.strokeRect(startX, startY, x - startX, y - startY); |
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} else if (tool === 'ellipse') { |
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var rx = Math.abs(x - startX) / 2; |
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var ry = Math.abs(y - startY) / 2; |
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var cx = startX + (x - startX) / 2; |
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var cy = startY + (y - startY) / 2; |
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ctx.beginPath(); |
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ctx.ellipse(cx, cy, rx, ry, 0, 0, Math.PI * 2); |
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ctx.stroke(); |
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} |
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} |
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|
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// ---- Flood fill (for fill tool if added) ---- |
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// Not included in toolbar by default; shapes + pen/marker cover most use-cases. |
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|
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// ---- Mouse events ---- |
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function onStart(x, y) { |
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saveHistory(); |
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isDrawing = true; |
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startX = x; startY = y; |
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if (tool === 'pen' || tool === 'marker' || tool === 'eraser') { |
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ctx.save(); |
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ctx.strokeStyle = tool === 'eraser' ? bgColor : color; |
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ctx.lineWidth = lineWidth; |
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ctx.globalAlpha = tool === 'marker' ? 0.45 : 1; |
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ctx.lineCap = 'round'; |
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ctx.lineJoin = 'round'; |
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ctx.beginPath(); |
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ctx.moveTo(x, y); |
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} else { |
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// shape — take snapshot |
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snapshot = ctx.getImageData(0, 0, canvW, canvH); |
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} |
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} |
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|
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function onMove(x, y) { |
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if (!isDrawing) return; |
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if (tool === 'pen' || tool === 'marker' || tool === 'eraser') { |
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applyTool(x, y); |
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} else { |
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drawShape(x, y); |
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} |
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} |
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|
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function onEnd(x, y) { |
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if (!isDrawing) return; |
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isDrawing = false; |
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if (tool === 'pen' || tool === 'marker' || tool === 'eraser') { |
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ctx.restore(); |
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} else { |
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drawShape(x, y); |
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snapshot = null; |
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} |
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} |
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|
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canvas.addEventListener('mousedown', function (e) { var p = getPos(e); onStart(p.x, p.y); }); |
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canvas.addEventListener('mousemove', function (e) { var p = getPos(e); onMove(p.x, p.y); }); |
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canvas.addEventListener('mouseup', function (e) { var p = getPos(e); onEnd(p.x, p.y); }); |
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canvas.addEventListener('mouseleave', function (e) { if (isDrawing) { var p = getPos(e); onEnd(p.x, p.y); } }); |
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|
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canvas.addEventListener('touchstart', function (e) { e.preventDefault(); var p = getPos(e); onStart(p.x, p.y); }, { passive: false }); |
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canvas.addEventListener('touchmove', function (e) { e.preventDefault(); var p = getPos(e); onMove(p.x, p.y); }, { passive: false }); |
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canvas.addEventListener('touchend', function (e) { e.preventDefault(); if (e.changedTouches.length) { var t = e.changedTouches[0]; var rect = canvas.getBoundingClientRect(); onEnd((t.clientX - rect.left) * canvW / rect.width, (t.clientY - rect.top) * canvH / rect.height); } }, { passive: false }); |
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|
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// Update cursor |
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function updateCursor() { |
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canvas.className = 'bkbg-drw-canvas' + (tool === 'eraser' ? ' bkbg-drw-eraser-cur' : ''); |
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} |
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|
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// ---- Build Toolbar ---- |
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if (toolbarEl) { |
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var TOOLS = [ |
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{ id: 'pen', label: '✏️', title: 'Pen (freehand)' }, |
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{ id: 'marker', label: '🖊️', title: 'Marker (soft)' }, |
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{ id: 'line', label: '📏', title: 'Line' }, |
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{ id: 'rect', label: '□', title: 'Rectangle' }, |
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{ id: 'ellipse', label: '○', title: 'Ellipse' }, |
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{ id: 'eraser', label: '🧹', title: 'Eraser' } |
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]; |
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|
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var toolBtns = {}; |
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TOOLS.forEach(function (t) { |
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var btn = document.createElement('button'); |
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btn.className = 'bkbg-drw-tool-btn' + (t.id === tool ? ' bkbg-drw-active' : ''); |
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btn.title = t.title; |
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btn.textContent = t.label; |
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btn.addEventListener('click', function () { |
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tool = t.id; |
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Object.values(toolBtns).forEach(function (b) { b.classList.remove('bkbg-drw-active'); }); |
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btn.classList.add('bkbg-drw-active'); |
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updateCursor(); |
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}); |
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toolbarEl.appendChild(btn); |
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toolBtns[t.id] = btn; |
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}); |
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|
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// Separator |
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var sep = document.createElement('div'); |
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sep.className = 'bkbg-drw-toolbar-sep'; |
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toolbarEl.appendChild(sep); |
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|
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// Palette |
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var palette = document.createElement('div'); |
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palette.className = 'bkbg-drw-palette'; |
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|
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var swatches = []; |
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PRESET_PALETTE.forEach(function (hex) { |
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var sw = document.createElement('div'); |
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sw.className = 'bkbg-drw-swatch' + (hex === color ? ' bkbg-drw-selected' : ''); |
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sw.style.background = hex; |
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sw.title = hex; |
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sw.addEventListener('click', function () { |
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color = hex; |
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swatches.forEach(function (s) { s.classList.remove('bkbg-drw-selected'); }); |
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sw.classList.add('bkbg-drw-selected'); |
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customColor.value = hex; |
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}); |
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palette.appendChild(sw); |
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swatches.push(sw); |
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}); |
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|
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// Custom color picker |
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var customColor = document.createElement('input'); |
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customColor.type = 'color'; |
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customColor.className = 'bkbg-drw-custom-color'; |
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customColor.title = 'Custom color'; |
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customColor.value = color; |
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customColor.addEventListener('input', function () { |
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color = customColor.value; |
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swatches.forEach(function (s) { s.classList.remove('bkbg-drw-selected'); }); |
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}); |
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palette.appendChild(customColor); |
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toolbarEl.appendChild(palette); |
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|
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// Separator |
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var sep2 = document.createElement('div'); |
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sep2.className = 'bkbg-drw-toolbar-sep'; |
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toolbarEl.appendChild(sep2); |
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|
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// Stroke width |
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var strokeWrap = document.createElement('div'); |
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strokeWrap.className = 'bkbg-drw-stroke-wrap'; |
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var strokeLbl = document.createElement('span'); |
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strokeLbl.className = 'bkbg-drw-stroke-label'; |
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strokeLbl.textContent = 'Size'; |
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var strokeRange = document.createElement('input'); |
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strokeRange.type = 'range'; |
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strokeRange.className = 'bkbg-drw-stroke-range'; |
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strokeRange.min = 1; |
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strokeRange.max = 60; |
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strokeRange.value = lineWidth; |
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strokeRange.addEventListener('input', function () { lineWidth = parseInt(strokeRange.value, 10); }); |
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strokeWrap.appendChild(strokeLbl); |
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strokeWrap.appendChild(strokeRange); |
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toolbarEl.appendChild(strokeWrap); |
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} |
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|
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// ---- Action buttons ---- |
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if (opts.showUndo !== false) { |
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var undoBtn = document.createElement('button'); |
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undoBtn.className = 'bkbg-drw-btn'; |
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undoBtn.textContent = '↩ Undo'; |
| 332 |
undoBtn.addEventListener('click', undo); |
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actionsEl.appendChild(undoBtn); |
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} |
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|
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var clearBtn = document.createElement('button'); |
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clearBtn.className = 'bkbg-drw-btn bkbg-drw-clear-btn'; |
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clearBtn.textContent = '🗑 Clear'; |
| 339 |
clearBtn.addEventListener('click', function () { |
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if (!confirm('Clear the canvas? This cannot be undone.')) return; |
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saveHistory(); |
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initCanvas(); |
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}); |
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actionsEl.appendChild(clearBtn); |
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|
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if (opts.showDownload !== false) { |
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var dlBtn = document.createElement('button'); |
| 348 |
dlBtn.className = 'bkbg-drw-btn bkbg-drw-dl-btn'; |
| 349 |
dlBtn.style.background = accent; |
| 350 |
dlBtn.textContent = '⬇ Download PNG'; |
| 351 |
dlBtn.addEventListener('click', function () { |
| 352 |
canvas.toBlob(function (blob) { |
| 353 |
var url = URL.createObjectURL(blob); |
| 354 |
var a = document.createElement('a'); |
| 355 |
a.href = url; |
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a.download = 'drawing.png'; |
| 357 |
a.click(); |
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setTimeout(function () { URL.revokeObjectURL(url); }, 2000); |
| 359 |
}, 'image/png'); |
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}); |
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actionsEl.appendChild(dlBtn); |
| 362 |
} |
| 363 |
|
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updateCursor(); |
| 365 |
} |
| 366 |
|
| 367 |
document.querySelectorAll('.bkbg-drw-app').forEach(function (root) { |
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initBlock(root); |
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}); |
| 370 |
})(); |
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|
