85 lines
3.3 KiB
Plaintext
85 lines
3.3 KiB
Plaintext
<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Aurora Admin · SignaturePad</title>
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<link rel="stylesheet" href="../.design_library/aurora-admin/colors_and_type.css" />
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<link rel="stylesheet" href="./SignaturePad.css" />
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</head>
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<body>
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<div class="aa-page">
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<h2 class="aa-h2">SignaturePad 签名板</h2>
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<p class="aa-desc">手写签名区域，支持鼠标与触屏，可撤销、清除、导出图片。</p>
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<div class="aa-demo">
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<div class="aa-sign" id="sign">
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<div class="aa-sign-pad">
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<canvas class="aa-sign-canvas" id="canvas"></canvas>
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<div class="aa-sign-placeholder" id="ph">请在此处签名</div>
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</div>
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<div class="aa-sign-actions">
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<button class="aa-btn" id="undo">撤销</button>
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<button class="aa-btn" id="clear">清除</button>
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<button class="aa-btn aa-btn--primary" id="save">保存</button>
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<span class="aa-sign-preview" id="preview"></span>
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</div>
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</div>
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</div>
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</div>
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<script>
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var canvas = document.getElementById('canvas');
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var ctx = canvas.getContext('2d');
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var ph = document.getElementById('ph');
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var preview = document.getElementById('preview');
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function fit() {
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var r = canvas.parentElement.getBoundingClientRect();
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canvas.width = r.width; canvas.height = r.height;
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}
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fit();
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window.addEventListener('resize', fit);
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var drawing = false, last = null, strokes = [], cur = [];
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function pos(e) {
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var r = canvas.getBoundingClientRect();
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return { x: (e.touches ? e.touches[0].clientX : e.clientX) - r.left, y: (e.touches ? e.touches[0].clientY : e.clientY) - r.top };
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}
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function start(e) { e.preventDefault(); drawing = true; last = pos(e); cur = [last]; strokes.push(cur); ph.style.display = 'none'; }
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function move(e) {
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if (!drawing) return; e.preventDefault();
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var p = pos(e); ctx.lineTo(p.x, p.y); ctx.stroke();
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cur.push(p);
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}
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function end() { drawing = false; last = null; }
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canvas.addEventListener('mousedown', start);
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canvas.addEventListener('mousemove', move);
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window.addEventListener('mouseup', end);
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canvas.addEventListener('touchstart', start, { passive: false });
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canvas.addEventListener('touchmove', move, { passive: false });
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window.addEventListener('touchend', end);
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document.getElementById('undo').onclick = function () {
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strokes.pop();
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redraw();
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if (!strokes.length) ph.style.display = 'flex';
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};
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document.getElementById('clear').onclick = function () { strokes = []; redraw(); ph.style.display = 'flex'; preview.textContent = ''; };
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document.getElementById('save').onclick = function () { preview.textContent = '已导出（' + canvas.width + '×' + canvas.height + '）'; };
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function redraw() {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.strokeStyle = '#1F2329'; ctx.lineWidth = 2; ctx.lineCap = 'round'; ctx.lineJoin = 'round';
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strokes.forEach(function (s) {
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ctx.beginPath();
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s.forEach(function (p, i) { i ? ctx.lineTo(p.x, p.y) : ctx.moveTo(p.x, p.y); });
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ctx.stroke();
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});
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}
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redraw();
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</script>
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</body>
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</html>
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