51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
/**
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* 画个标 · 海报导出：SVG / PNG（按画布规格导出）
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*/
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const HGB_PosterExporter = (function () {
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'use strict';
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function buildSvg(spec, elements) {
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return HGB_PosterRenderer.render(spec, elements);
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}
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function download(name, blob) {
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const a = document.createElement('a');
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a.href = URL.createObjectURL(blob);
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a.download = name;
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document.body.appendChild(a);
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a.click();
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setTimeout(() => { URL.revokeObjectURL(a.href); a.remove(); }, 0);
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}
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function exportSvg(spec, elements, base) {
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const svg = buildSvg(spec, elements);
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download((base || '海报') + '.svg', new Blob([svg], { type: 'image/svg+xml' }));
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}
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/** 渲染 SVG 到位图并下载（scale 控制放大倍数，默认 1） */
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function svgToCanvas(spec, elements, scale) {
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return new Promise((resolve, reject) => {
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const svg = buildSvg(spec, elements);
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const img = new Image();
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img.onload = () => {
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const w = Math.round(spec.w * scale), h = Math.round(spec.h * scale);
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const c = document.createElement('canvas');
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c.width = w; c.height = h;
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const ctx = c.getContext('2d');
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ctx.drawImage(img, 0, 0, w, h);
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resolve(c);
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};
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img.onerror = () => reject(new Error('SVG 渲染失败'));
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img.src = 'data:image/svg+xml;charset=utf-8,' + encodeURIComponent(svg);
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});
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}
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async function exportPng(spec, elements, base, scale) {
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const c = await svgToCanvas(spec, elements, scale || 1);
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const blob = await new Promise(res => c.toBlob(res, 'image/png'));
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download((base || '海报') + '.png', blob);
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}
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return { buildSvg, exportSvg, exportPng, svgToCanvas };
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})();
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