{"id":107296,"date":"2026-09-19T09:40:39","date_gmt":"2026-09-19T01:40:39","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/107296.html"},"modified":"2026-09-19T09:40:39","modified_gmt":"2026-09-19T01:40:39","slug":"12-%e8%af%81%e4%bb%b6%e6%ad%a3%e5%8f%8d%e9%9d%a2%e5%90%88%e6%88%90a4%ef%bc%9acomposeidtoa4-%e6%8e%92%e7%89%88%e4%b8%8e%e6%89%93%e5%8d%b0%e7%b2%be%e5%ba%a6%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/107296.html","title":{"rendered":"12. \u8bc1\u4ef6\u6b63\u53cd\u9762\u5408\u6210A4\uff1acomposeIdToA4 \u6392\u7248\u4e0e\u6253\u5370\u7cbe\u5ea6\u63a7\u5236"},"content":{"rendered":"

12. \u8bc1\u4ef6\u6b63\u53cd\u9762\u5408\u6210A4：composeIdToA4 \u6392\u7248\u4e0e\u6253\u5370\u7cbe\u5ea6\u63a7\u5236<\/h2>\n

\u8eab\u4efd\u8bc1\u6b63\u53cd\u9762\u5206\u522b\u626b\u63cf\u540e，\u7528\u6237\u6700\u5e38\u89c1\u7684\u9700\u6c42\u662f"\u5408\u6210\u5230\u4e00\u5f20A4\u7eb8\u4e0a\u6253\u5370"\u3002\u770b\u4f3c\u7b80\u5355，\u5b9e\u5219\u6697\u85cf\u8bf8\u591a\u5de5\u7a0b\u7ec6\u8282：\u6253\u5370\u7cbe\u5ea6\u63a7\u5236\u3001\u771f\u5b9e\u7269\u7406\u5c3a\u5bf81:1\u8fd8\u539f\u3001\u6a2a\u7ad6\u5e03\u5c40\u81ea\u52a8\u5c45\u4e2d\u3001\u4fdd\u6301\u5bbd\u9ad8\u6bd4\u7f29\u653e\u3001\u4ee5\u53ca\u9632\u6ee5\u7528\u6c34\u5370\u96c6\u6210\u3002\u672c\u6587\u5b8c\u6574\u62c6\u89e3 composeIdToA4 \u51fd\u6570\u7684\u5b9e\u73b0，\u4ee5\u53ca IdCopyService \u5982\u4f55\u5c06\u626b\u63cf\u7ba1\u7ebf\u4e0eA4\u5408\u6210\u3001\u6c34\u5370\u96c6\u6210\u4e32\u8054\u8d77\u6765\u3002<\/p>\n

\n

\u4e00\u3001\u4e1a\u52a1\u573a\u666f\u4e0e\u6838\u5fc3\u9700\u6c42<\/h3>\n

1.1 \u5178\u578b\u4f7f\u7528\u6d41\u7a0b<\/h4>\n

\u7528\u6237\u62cd\u6444\u8eab\u4efd\u8bc1\u6b63\u9762
\n \u2192 \u81ea\u52a8\u68c0\u6d4b\u8fb9\u7f18 + \u900f\u89c6\u6821\u6b63
\n \u2192 \u589e\u5f3a\u6ee4\u955c（\u767d\u5e95\u52a0\u6df1\u3001\u6587\u5b57\u9510\u5316）
\n \u2192 \u7528\u6237\u62cd\u6444\u8eab\u4efd\u8bc1\u53cd\u9762
\n \u2192 \u540c\u6837\u6821\u6b63+\u6ee4\u955c
\n \u2192 \u9009\u62e9\u5e03\u5c40（\u4e0a\u4e0b\u7ad6\u6392 \/ \u5de6\u53f3\u6a2a\u6392）
\n \u2192 \u53ef\u9009：\u6dfb\u52a0\u9632\u6ee5\u7528\u6c34\u5370
\n \u2192 \u751f\u6210A4\u5c3a\u5bf8JPEG
\n \u2192 \u53ef\u76f4\u63a5\u6253\u5370（1:1\u7269\u7406\u5c3a\u5bf8）<\/p>\n

1.2 \u6838\u5fc3\u7ea6\u675f<\/h4>\n\n\u7ea6\u675f\u9879\u8981\u6c42\u8bf4\u660e<\/tr>\n\n\n\n\n\n\n\n\n\n\n
\u6253\u5370\u5c3a\u5bf8<\/td>\n1:1\u7269\u7406\u6bd4\u4f8b<\/td>\n\u6253\u5370\u51fa\u6765\u7684\u8bc1\u4ef6\u5927\u5c0f\u4e0e\u771f\u5b9e\u8eab\u4efd\u8bc1\u4e00\u81f4<\/td>\n<\/tr>\n
A4\u5c3a\u5bf8<\/td>\n210\u00d7297mm<\/td>\n\u56fd\u9645\u6807\u51c6\u7eb8\u5f20<\/td>\n<\/tr>\n
\u9884\u89c8\u7cbe\u5ea6<\/td>\n~130dpi<\/td>\n\u6d41\u7545\u9884\u89c8<\/td>\n<\/tr>\n
\u5bfc\u51fa\u7cbe\u5ea6<\/td>\n300dpi<\/td>\n\u6253\u5370\u7ea7\u7cbe\u5ea6，2480\u00d73508px<\/td>\n<\/tr>\n
\u8bc1\u4ef6\u7269\u7406\u5c3a\u5bf8<\/td>\n85.6\u00d754mm<\/td>\n\u7b2c\u4e8c\u4ee3\u8eab\u4efd\u8bc1\u6807\u51c6（CR80）<\/td>\n<\/tr>\n
\u8bc1\u4ef6\u95f4\u8ddd<\/td>\n8mm<\/td>\n\u6b63\u53cd\u9762\u4e4b\u95f4\u7684\u7a7a\u9699<\/td>\n<\/tr>\n
\u6392\u7248\u65b9\u5f0f<\/td>\n\u6574\u7ec4\u5c45\u4e2d<\/td>\n\u6a2a\u7ad6\u5e03\u5c40\u5747\u5c45\u4e2d\u653e\u7f6e，\u4e0d\u9760\u56fa\u5b9a\u8fb9\u8ddd<\/td>\n<\/tr>\n
\u7f29\u653e\u65b9\u5f0f<\/td>\n\u4fdd\u6301\u5bbd\u9ad8\u6bd4<\/td>\n\u4e0d\u62c9\u4f38\u3001\u4e0d\u88c1\u526a，\u7b49\u6bd4\u7f29\u653e\u5230\u8bc1\u4ef6\u6846\u5185<\/td>\n<\/tr>\n
\u6c34\u5370\u96c6\u6210<\/td>\n\u53ef\u9009\u53e0\u52a0<\/td>\nWatermarkService \u9632\u6ee5\u7528\u4fdd\u62a4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u4e8c\u3001DPI\u4e0e\u7269\u7406\u5c3a\u5bf8\u7684\u6570\u5b66\u5173\u7cfb<\/h3>\n

2.1 \u6838\u5fc3\u516c\u5f0f<\/h4>\n

\u6253\u5370\u4e16\u754c\u7684\u9ec4\u91d1\u516c\u5f0f：<\/p>\n

\u50cf\u7d20\u6570(px) = \u7269\u7406\u5c3a\u5bf8(mm) \/ 25.4 \u00d7 DPI<\/p>\n

\u5176\u4e2d 25.4 \u662f\u82f1\u5bf8\u5230\u6beb\u7c73\u7684\u6362\u7b97\u56e0\u5b50\u3002<\/p>\n

2.2 \u5173\u952e\u5c3a\u5bf8\u8ba1\u7b97<\/h4>\n

\u5728 composeIdToA4 \u4e2d，\u6240\u6709\u50cf\u7d20\u5c3a\u5bf8\u90fd\u4ece\u7269\u7406\u5c3a\u5bf8 + DPI \u52a8\u6001\u8ba1\u7b97：<\/p>\n

final<\/span> W<\/span> =<\/span> (<\/span>8.2677<\/span> *<\/span> dpi)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span> \/\/ A4 \u5bbd 210mm<\/span>
\nfinal<\/span> H<\/span> =<\/span> (<\/span>11.6929<\/span> *<\/span> dpi)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span> \/\/ A4 \u9ad8 297mm<\/span>
\nfinal<\/span> cardW =<\/span> (<\/span>85.6<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\nfinal<\/span> cardH =<\/span> (<\/span>54.0<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\nfinal<\/span> gap =<\/span> (<\/span>8<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

\u6ce8\u610f：A4 \u5bbd\u5ea6\u7528 8.2677 * dpi \u800c\u4e0d\u662f 210 * dpi \/ 25.4，\u4e24\u8005\u6570\u5b66\u4e0a\u7b49\u4ef7（210\/25.4 \u2248 8.2677），\u90fd\u662f\u8ba1\u7b97 A4 \u7eb8\u7684\u82f1\u5bf8\u6570\u4e58\u4ee5 DPI\u3002<\/p>\n\n\u5bf9\u8c61\u7269\u7406\u5c3a\u5bf8130dpi \u50cf\u7d20300dpi \u50cf\u7d20<\/tr>\n\n\n\n\n
A4\u7eb8<\/td>\n210\u00d7297mm<\/td>\n1075\u00d71520px<\/td>\n2480\u00d73508px<\/td>\n<\/tr>\n
\u8eab\u4efd\u8bc1<\/td>\n85.6\u00d754mm<\/td>\n438\u00d7276px<\/td>\n1011\u00d7638px<\/td>\n<\/tr>\n
\u8bc1\u4ef6\u95f4\u8ddd<\/td>\n8mm<\/td>\n41px<\/td>\n94px<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5173\u952e\u7406\u89e3： \u4e3a\u4ec0\u4e48\u9884\u89c8\u7528 130dpi \u800c\u5bfc\u51fa\u7528 300dpi？\u56e0\u4e3a 300dpi \u7684 A4 \u56fe\u6709 2480\u00d73508 \u2248 870 \u4e07\u50cf\u7d20，\u5408\u6210+\u6c34\u5370\u53ef\u80fd\u9700\u8981 1~2 \u79d2，\u62d6\u52a8\u5e03\u5c40\u53c2\u6570\u65f6\u5b8c\u5168\u65e0\u6cd5\u5b9e\u65f6\u9884\u89c8\u3002130dpi \u53ea\u6709\u7ea6 160 \u4e07\u50cf\u7d20，\u91cd\u7ed8\u4ec5\u9700\u51e0\u767e\u6beb\u79d2，\u8db3\u4ee5\u652f\u6491\u5b9e\u65f6\u4ea4\u4e92\u3002<\/p>\n

\n

\u4e09\u3001composeIdToA4 \u6838\u5fc3\u5b9e\u73b0<\/h3>\n

3.1 \u51fd\u6570\u7b7e\u540d<\/h4>\n

\/\/\/ \u8bc1\u4ef6\u590d\u5370（\u4e13\u95e8\u529f\u80fd）：<\/span>
\n\/\/\/ \u628a\u8bc1\u4ef6\u6b63\u53cd\u9762\u5408\u6210\u5230\u540c\u4e00\u5f20 A4 \u767d\u7eb8\u4e0a（300dpi = 2480\u00d73508），<\/span>
\n\/\/\/ \u652f\u6301\u300c\u4e0a\u4e0b\u7ad6\u6392\u300d\u4e0e\u300c\u5de6\u53f3\u6a2a\u6392\u300d\u4e24\u79cd\u7248\u5f0f，<\/span>
\n\/\/\/ \u7535\u5b50\u7248\u53ef\u53d1\u9001\u3001\u7eb8\u8d28\u7248\u53ef\u6309 A4 100% \u76f4\u63a5\u6253\u5370\u3002<\/span>
\n\/\/\/ \u4e24\u79cd\u7248\u5f0f\u4e0b\u8bc1\u4ef6\u90fd\u6309\u771f\u5b9e\u7269\u7406\u5c3a\u5bf8（85.6\u00d754mm）\u5c45\u4e2d\u653e\u7f6e，\u5927\u5c0f\u5b8c\u5168\u4e00\u81f4\u3002<\/span>
\nimg.<\/span><\/span>Image<\/span> composeIdToA4<\/span>(<\/span>{<\/span>
\n required img.<\/span><\/span>Image<\/span> front,<\/span>
\n required img.<\/span><\/span>Image<\/span> back,<\/span>
\n required bool stacked,<\/span>
\n int dpi =<\/span> 300<\/span>,<\/span>
\n}<\/span>)<\/span><\/p>\n

\u53c2\u6570\u8bf4\u660e：<\/p>\n\n\u53c2\u6570\u7c7b\u578b\u9ed8\u8ba4\u503c\u542b\u4e49<\/tr>\n\n\n\n\n\n
front<\/td>\nimg.Image<\/td>\n\u5fc5\u586b<\/td>\n\u8bc1\u4ef6\u6b63\u9762\u56fe\u50cf（\u5df2\u89e3\u7801\u7684 image \u5305\u5bf9\u8c61）<\/td>\n<\/tr>\n
back<\/td>\nimg.Image<\/td>\n\u5fc5\u586b<\/td>\n\u8bc1\u4ef6\u53cd\u9762\u56fe\u50cf（\u5df2\u89e3\u7801\u7684 image \u5305\u5bf9\u8c61）<\/td>\n<\/tr>\n
stacked<\/td>\nbool<\/td>\n\u5fc5\u586b<\/td>\ntrue=\u4e0a\u4e0b\u7ad6\u6392，false=\u5de6\u53f3\u6a2a\u6392<\/td>\n<\/tr>\n
dpi<\/td>\nint<\/td>\n300<\/td>\n\u8f93\u51fa\u7cbe\u5ea6，\u51b3\u5b9a A4 \u753b\u5e03\u7684\u50cf\u7d20\u5c3a\u5bf8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u8f93\u5165\u662f img.Image \u5bf9\u8c61\u800c\u4e0d\u662f\u6587\u4ef6\u8def\u5f84\u2014\u2014\u56e0\u4e3a\u8c03\u7528\u65b9（IdCopyService）\u5df2\u7ecf\u505a\u4e86\u626b\u63cf\u7ba1\u7ebf\u5904\u7406（\u88c1\u8fb9+\u900f\u89c6\u77eb\u6b63+\u6ee4\u955c），\u76f4\u63a5\u4f20\u5165\u5185\u5b58\u4e2d\u7684\u56fe\u50cf\u5bf9\u8c61，\u907f\u514d\u91cd\u590d\u7f16\u89e3\u7801\u3002<\/p>\n

3.2 \u5b8c\u6574\u4ee3\u7801<\/h4>\n

import<\/span> 'dart:math'<\/span><\/span> as<\/span> math;<\/span>
\nimport<\/span> 'package:image\/image.dart'<\/span><\/span> as<\/span> img;<\/span>
\nimport<\/span> '..\/..\/core\/image_math.dart'<\/span><\/span>;<\/span><\/p>\n

img.<\/span><\/span>Image<\/span> composeIdToA4<\/span>(<\/span>{<\/span>
\n required img.<\/span><\/span>Image<\/span> front,<\/span>
\n required img.<\/span><\/span>Image<\/span> back,<\/span>
\n required bool stacked,<\/span>
\n int dpi =<\/span> 300<\/span>,<\/span>
\n}<\/span>)<\/span> {<\/span>
\n final<\/span> W<\/span> =<\/span> (<\/span>8.2677<\/span> *<\/span> dpi)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span> \/\/ A4 \u5bbd 210mm<\/span>
\n final<\/span> H<\/span> =<\/span> (<\/span>11.6929<\/span> *<\/span> dpi)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span> \/\/ A4 \u9ad8 297mm<\/span>
\n final<\/span> canvas =<\/span> img.<\/span><\/span>Image<\/span>(<\/span>width:<\/span> W<\/span>,<\/span> height:<\/span> H<\/span>,<\/span> numChannels:<\/span> 4<\/span>)<\/span>;<\/span>
\n img.<\/span>fill<\/span>(<\/span>canvas,<\/span> color:<\/span> img.<\/span><\/span>ColorRgba8<\/span>(<\/span>255<\/span>,<\/span> 255<\/span>,<\/span> 255<\/span>,<\/span> 255<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

\/\/ \u8eab\u4efd\u8bc1\u771f\u5b9e\u7269\u7406\u5c3a\u5bf8（85.6\u00d754mm），\u4e24\u79cd\u7248\u5f0f\u5171\u7528<\/span>
\n final<\/span> cardW =<\/span> (<\/span>85.6<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\n final<\/span> cardH =<\/span> (<\/span>54.0<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\n final<\/span> gap =<\/span> (<\/span>8<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

void<\/span> place<\/span>(<\/span>img.<\/span><\/span>Image<\/span> im,<\/span> int slotX,<\/span> int slotY)<\/span> {<\/span>
\n final<\/span> f =<\/span> ensureRgba<\/span>(<\/span>im)<\/span>;<\/span>
\n if<\/span> (<\/span>f.<\/span>width <=<\/span> 0<\/span> ||<\/span> f.<\/span>height <=<\/span> 0<\/span>)<\/span> return<\/span>;<\/span>
\n \/\/ \u4fdd\u6301\u6bd4\u4f8b\u7f29\u653e\u5230\u8eab\u4efd\u8bc1\u771f\u5b9e\u5c3a\u5bf8\u6846\u5185（\u4e0d\u62c9\u4f38\u3001\u4e0d\u88c1\u526a）<\/span>
\n final<\/span> scale =<\/span> math.<\/span>min<\/span>(<\/span>cardW \/<\/span> f.<\/span>width,<\/span> cardH \/<\/span> f.<\/span>height)<\/span>;<\/span>
\n final<\/span> w =<\/span> (<\/span>f.<\/span>width *<\/span> scale)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\n final<\/span> h =<\/span> (<\/span>f.<\/span>height *<\/span> scale)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\n final<\/span> x =<\/span> slotX +<\/span> (<\/span>(<\/span>cardW –<\/span> w)<\/span> ~\/<\/span> 2<\/span>)<\/span>;<\/span>
\n final<\/span> y =<\/span> slotY +<\/span> (<\/span>(<\/span>cardH –<\/span> h)<\/span> ~\/<\/span> 2<\/span>)<\/span>;<\/span>
\n final<\/span> resized =<\/span> img.<\/span>copyResize<\/span>(<\/span>f,<\/span>
\n width:<\/span> w,<\/span> height:<\/span> h,<\/span> interpolation:<\/span> img.<\/span><\/span>Interpolation<\/span>.<\/span>linear)<\/span>;<\/span>
\n img.<\/span>compositeImage<\/span>(<\/span>canvas,<\/span> resized,<\/span> dstX:<\/span> x,<\/span> dstY:<\/span> y)<\/span>;<\/span>
\n }<\/span><\/p>\n

if<\/span> (<\/span>stacked)<\/span> {<\/span>
\n \/\/ \u4e0a\u4e0b\u7ad6\u6392：\u6574\u7ec4\u5c45\u4e2d<\/span>
\n final<\/span> startX =<\/span> (<\/span>W<\/span> –<\/span> cardW)<\/span> ~\/<\/span> 2<\/span>;<\/span>
\n final<\/span> startY =<\/span> (<\/span>H<\/span> –<\/span> cardH *<\/span> 2<\/span> –<\/span> gap)<\/span> ~\/<\/span> 2<\/span>;<\/span>
\n place<\/span>(<\/span>front,<\/span> startX,<\/span> startY)<\/span>;<\/span>
\n place<\/span>(<\/span>back,<\/span> startX,<\/span> startY +<\/span> cardH +<\/span> gap)<\/span>;<\/span>
\n }<\/span> else<\/span> {<\/span>
\n \/\/ \u5de6\u53f3\u6a2a\u6392：\u6574\u7ec4\u5c45\u4e2d<\/span>
\n final<\/span> startX =<\/span> (<\/span>W<\/span> –<\/span> cardW *<\/span> 2<\/span> –<\/span> gap)<\/span> ~\/<\/span> 2<\/span>;<\/span>
\n final<\/span> startY =<\/span> (<\/span>H<\/span> –<\/span> cardH)<\/span> ~\/<\/span> 2<\/span>;<\/span>
\n place<\/span>(<\/span>front,<\/span> startX,<\/span> startY)<\/span>;<\/span>
\n place<\/span>(<\/span>back,<\/span> startX +<\/span> cardW +<\/span> gap,<\/span> startY)<\/span>;<\/span>
\n }<\/span>
\n return<\/span> canvas;<\/span>
\n}<\/span><\/p>\n

\n

\u56db\u3001\u6838\u5fc3\u8bbe\u8ba1\u7ec6\u8282<\/h3>\n

4.1 \u4fdd\u6301\u5bbd\u9ad8\u6bd4\u7f29\u653e（place \u51fd\u6570）<\/h4>\n

void<\/span> place<\/span>(<\/span>img.<\/span><\/span>Image<\/span> im,<\/span> int slotX,<\/span> int slotY)<\/span> {<\/span>
\n final<\/span> f =<\/span> ensureRgba<\/span>(<\/span>im)<\/span>;<\/span>
\n if<\/span> (<\/span>f.<\/span>width <=<\/span> 0<\/span> ||<\/span> f.<\/span>height <=<\/span> 0<\/span>)<\/span> return<\/span>;<\/span>
\n \/\/ \u4fdd\u6301\u6bd4\u4f8b\u7f29\u653e\u5230\u8eab\u4efd\u8bc1\u771f\u5b9e\u5c3a\u5bf8\u6846\u5185（\u4e0d\u62c9\u4f38\u3001\u4e0d\u88c1\u526a）<\/span>
\n final<\/span> scale =<\/span> math.<\/span>min<\/span>(<\/span>cardW \/<\/span> f.<\/span>width,<\/span> cardH \/<\/span> f.<\/span>height)<\/span>;<\/span>
\n final<\/span> w =<\/span> (<\/span>f.<\/span>width *<\/span> scale)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\n final<\/span> h =<\/span> (<\/span>f.<\/span>height *<\/span> scale)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span>
\n final<\/span> x =<\/span> slotX +<\/span> (<\/span>(<\/span>cardW –<\/span> w)<\/span> ~\/<\/span> 2<\/span>)<\/span>;<\/span>
\n final<\/span> y =<\/span> slotY +<\/span> (<\/span>(<\/span>cardH –<\/span> h)<\/span> ~\/<\/span> 2<\/span>)<\/span>;<\/span>
\n final<\/span> resized =<\/span> img.<\/span>copyResize<\/span>(<\/span>f,<\/span>
\n width:<\/span> w,<\/span> height:<\/span> h,<\/span> interpolation:<\/span> img.<\/span><\/span>Interpolation<\/span>.<\/span>linear)<\/span>;<\/span>
\n img.<\/span>compositeImage<\/span>(<\/span>canvas,<\/span> resized,<\/span> dstX:<\/span> x,<\/span> dstY:<\/span> y)<\/span>;<\/span>
\n}<\/span><\/p>\n

\u5173\u952e\u903b\u8f91：<\/p>\n

  • \u7b49\u6bd4\u7f29\u653e：\u7528 math.min(cardW\/f.width, cardH\/f.height) \u53d6\u8f83\u5c0f\u7684\u7f29\u653e\u6bd4，\u786e\u4fdd\u8bc1\u4ef6\u5b8c\u6574\u653e\u5165 85.6\u00d754mm \u7684\u6846\u5185，\u4e0d\u62c9\u4f38\u3001\u4e0d\u88c1\u526a<\/li>\n
  • \u5c45\u4e2d\u653e\u7f6e：\u5728\u5361\u7247\u6846\u5185\u6c34\u5e73\u548c\u5782\u76f4\u90fd\u5c45\u4e2d\u2014\u2014(cardW-w)~\/2 \u548c (cardH-h)~\/2<\/li>\n
  • \u7ebf\u6027\u63d2\u503c：Interpolation.linear \u5e73\u8861\u901f\u5ea6\u548c\u8d28\u91cf，\u8bc1\u4ef6\u7f29\u653e\u573a\u666f\u8db3\u591f\u6e05\u6670<\/li>\n

    \u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u7f29\u653e\u5230 cardW \u00d7 cardH？\u56e0\u4e3a\u7528\u6237\u62cd\u6444\u7684\u8bc1\u4ef6\u56fe\u6bd4\u4f8b\u4e0d\u4e00\u5b9a\u662f\u6807\u51c6\u7684 85.6:54\u3002\u53ef\u80fd\u88c1\u8fb9\u6709\u8bef\u5dee\u3001\u53ef\u80fd\u8bc1\u4ef6\u7565\u6709\u503e\u659c\u5bfc\u81f4\u6bd4\u4f8b\u53d8\u5316\u3002\u7b49\u6bd4\u7f29\u653e+\u5c45\u4e2d\u4fdd\u8bc1\u4e86\u8bc1\u4ef6\u4e0d\u4f1a\u53d8\u5f62，\u7559\u767d\u5747\u5300\u3002<\/p>\n

    4.2 \u6574\u7ec4\u5782\u76f4\u5c45\u4e2d（\u4e0d\u662f\u56fa\u5b9a\u4e0a\u8fb9\u8ddd）<\/h4>\n

    \u4e0a\u4e0b\u7ad6\u6392\u5e03\u5c40：<\/p>\n

    \/\/ \u4e0a\u4e0b\u7ad6\u6392：\u6574\u7ec4\u5c45\u4e2d<\/span>
    \nfinal<\/span> startX =<\/span> (<\/span>W<\/span> –<\/span> cardW)<\/span> ~\/<\/span> 2<\/span>;<\/span>
    \nfinal<\/span> startY =<\/span> (<\/span>H<\/span> –<\/span> cardH *<\/span> 2<\/span> –<\/span> gap)<\/span> ~\/<\/span> 2<\/span>;<\/span><\/p>\n

    \u8ba1\u7b97\u65b9\u5f0f\u662f (A4 \u9ad8\u5ea6 – \u4e24\u5f20\u5361\u9ad8\u5ea6 – \u95f4\u8ddd) \/ 2\u2014\u2014\u8ba9"\u4e24\u5f20\u5361+\u95f4\u8ddd"\u8fd9\u4e2a\u6574\u4f53\u5728 A4 \u7eb8\u4e0a\u5782\u76f4\u5c45\u4e2d，\u800c\u4e0d\u662f\u4ece\u56fa\u5b9a\u7684 25mm \u4e0a\u8fb9\u8ddd\u5f00\u59cb\u3002<\/p>\n

    \u5de6\u53f3\u6a2a\u6392\u5e03\u5c40\u540c\u7406：<\/p>\n

    \/\/ \u5de6\u53f3\u6a2a\u6392：\u6574\u7ec4\u5c45\u4e2d<\/span>
    \nfinal<\/span> startX =<\/span> (<\/span>W<\/span> –<\/span> cardW *<\/span> 2<\/span> –<\/span> gap)<\/span> ~\/<\/span> 2<\/span>;<\/span>
    \nfinal<\/span> startY =<\/span> (<\/span>H<\/span> –<\/span> cardH)<\/span> ~\/<\/span> 2<\/span>;<\/span><\/p>\n

    \u6c34\u5e73\u65b9\u5411\u8ba9"\u4e24\u5f20\u5361+\u95f4\u8ddd"\u6574\u4f53\u5c45\u4e2d，\u5782\u76f4\u65b9\u5411\u5355\u5f20\u5361\u5c45\u4e2d\u3002<\/p>\n

    \u4e3a\u4ec0\u4e48\u6574\u7ec4\u5c45\u4e2d\u800c\u4e0d\u662f\u56fa\u5b9a\u4e0a\u8fb9\u8ddd？\u56e0\u4e3a\u56fa\u5b9a\u8fb9\u8ddd\u5728\u4e0d\u540c DPI \u4e0b\u9700\u8981\u91cd\u65b0\u8ba1\u7b97，\u800c\u4e14\u7ad6\u6392\u65f6\u4e24\u5f20\u5361\u7684\u603b\u9ad8\u5ea6\u662f\u56fa\u5b9a\u7684（2\u00d7cardH + gap），\u5c45\u4e2d\u653e\u7f6e\u89c6\u89c9\u4e0a\u66f4\u5e73\u8861，\u6253\u5370\u51fa\u6765\u4e5f\u66f4\u7f8e\u89c2\u2014\u2014\u4e0a\u9762\u7a7a\u767d\u548c\u4e0b\u9762\u7a7a\u767d\u4e00\u6837\u591a，\u770b\u8d77\u6765\u5c31\u662f"\u4e13\u4e1a\u590d\u5370"\u7684\u6548\u679c\u3002<\/p>\n

    4.3 \u8bc1\u4ef6\u95f4\u8ddd 8mm<\/h4>\n

    final<\/span> gap =<\/span> (<\/span>8<\/span> *<\/span> dpi \/<\/span> 25.4<\/span>)<\/span>.<\/span>round<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    \u6b63\u53cd\u9762\u4e4b\u95f4\u7559 8mm \u7684\u7a7a\u9699\u3002\u8fd9\u4e2a\u5bbd\u5ea6\u521a\u597d：<\/p>\n

      \n
    • \u4e0d\u4f1a\u592a\u7a84（<5mm）：\u4e24\u5f20\u8bc1\u4ef6\u6324\u5728\u4e00\u8d77，\u89c2\u611f\u5c40\u4fc3<\/li>\n
    • \u4e0d\u4f1a\u592a\u5bbd（>12mm）：\u6d6a\u8d39\u7a7a\u95f4，\u7ad6\u6392\u65f6\u53ef\u80fd\u63a5\u8fd1 A4 \u8fb9\u7f18<\/li>\n
    • 8mm \u5927\u7ea6\u662f\u8eab\u4efd\u8bc1\u9ad8\u5ea6\u7684 15%，\u89c6\u89c9\u6bd4\u4f8b\u8212\u9002<\/li>\n<\/ul>\n
      \n

      \u4e94\u3001\u4e24\u79cd\u7248\u5f0f\u5bf9\u6bd4<\/h3>\n

      5.1 \u4e0a\u4e0b\u7ad6\u6392（stacked = true）<\/h4>\n

      \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 A4 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
      \n\u2502 \u2502
      \n\u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502
      \n\u2502 \u2502 \u8eab\u4efd\u8bc1\u6b63\u9762 \u2502 \u2502
      \n\u2502 \u2502 85.6\u00d754mm \u2502 \u2502
      \n\u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
      \n\u2502 8mm \u95f4\u9699 \u2502
      \n\u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u2502
      \n\u2502 \u2502 \u8eab\u4efd\u8bc1\u53cd\u9762 \u2502 \u2502
      \n\u2502 \u2502 85.6\u00d754mm \u2502 \u2502
      \n\u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2502
      \n\u2502 \u2502
      \n\u2502 (\u7a7a\u767d) \u2502
      \n\u2502 \u2502
      \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

        \n
      • \u6b63\u9762\u5728\u4e0a，\u53cd\u9762\u5728\u4e0b<\/li>\n
      • \u5de6\u53f3\u5c45\u4e2d，\u6574\u7ec4\u5782\u76f4\u5c45\u4e2d<\/li>\n
      • \u9002\u5408\u4f20\u7edf"\u8eab\u4efd\u8bc1\u590d\u5370"\u7684\u4e60\u60ef，\u5927\u591a\u6570\u4eba\u9ed8\u8ba4\u7ad6\u6392<\/li>\n<\/ul>\n

        5.2 \u5de6\u53f3\u6a2a\u6392（stacked = false）<\/h4>\n

        \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 A4 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
        \n\u2502 \u2502
        \n\u2502 \u2502
        \n\u2502 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510 8mm \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510\u2502
        \n\u2502 \u2502 \u6b63\u9762 \u2502 \u95f4\u9699 \u2502 \u53cd\u9762 \u2502\u2502
        \n\u2502 \u2502 \u2502 \u2502 \u2502\u2502
        \n\u2502 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518\u2502
        \n\u2502 \u2502
        \n\u2502 \u2502
        \n\u2502 (\u7a7a\u767d) \u2502
        \n\u2502 \u2502
        \n\u2502 \u2502
        \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

          \n
        • \u6b63\u9762\u5728\u5de6，\u53cd\u9762\u5728\u53f3<\/li>\n
        • \u4e0a\u4e0b\u5c45\u4e2d，\u6574\u7ec4\u6c34\u5e73\u5c45\u4e2d<\/li>\n
        • \u9002\u5408\u8282\u7701\u7eb8\u5f20\u9ad8\u5ea6，\u6216\u8005\u9700\u8981\u5728\u4e0b\u65b9\u6dfb\u52a0\u5907\u6ce8\u6587\u5b57\u7684\u573a\u666f<\/li>\n<\/ul>\n

          \u4e24\u79cd\u7248\u5f0f\u4e0b\u8bc1\u4ef6\u7684\u7269\u7406\u5c3a\u5bf8\u5b8c\u5168\u4e00\u81f4\u2014\u2014\u90fd\u662f 85.6\u00d754mm \u771f\u5b9e\u5927\u5c0f\u3002\u533a\u522b\u53ea\u662f\u6392\u5217\u65b9\u5411，\u4e0d\u5f71\u54cd\u6253\u5370\u51fa\u6765\u7684\u8bc1\u4ef6\u5c3a\u5bf8\u3002<\/p>\n

          \n

          \u516d\u3001IdCopyService：\u4ece\u626b\u63cf\u5230A4\u7684\u5b8c\u6574\u7ba1\u7ebf<\/h3>\n

          composeIdToA4 \u662f\u7eaf\u6392\u7248\u51fd\u6570，\u4e0d\u8d1f\u8d23\u6587\u4ef6\u8bfb\u5199\u3001\u626b\u63cf\u5904\u7406\u3001\u6c34\u5370\u96c6\u6210\u3002\u8fd9\u4e9b\u4e0a\u5c42\u903b\u8f91\u7531 IdCopyService \u5c01\u88c5：<\/p>\n

          6.1 \u7c7b\u7ed3\u6784<\/h4>\n

          \/\/\/ \u8bc1\u4ef6\u590d\u5370\u6e32\u67d3\u670d\u52a1：<\/span>
          \n\/\/\/ \u6b63\u53cd\u9762\u5404\u81ea\u300c\u88c1\u8fb9 + \u900f\u89c6\u77eb\u6b63\u300d\u540e\u5408\u6210\u5230\u540c\u4e00\u5f20 A4 \u753b\u5e03\u3002<\/span>
          \n\/\/\/<\/span>
          \n\/\/\/ \u9884\u89c8\u3001\u6301\u4e45\u5316\u3001PDF \u5bfc\u51fa\u3001\u56fe\u7247\u5bfc\u51fa\u5171\u7528\u8fd9\u4e00\u6761\u7ba1\u7ebf，<\/span>
          \n\/\/\/ \u4ec5\u901a\u8fc7 dpi \/ \u8d28\u91cf\u53c2\u6570\u533a\u5206\u7528\u9014，\u4fdd\u8bc1\u5404\u5904\u8f93\u51fa\u6548\u679c\u4e00\u81f4\u3002<\/span>
          \n\/\/\/ \u6574\u4e2a\u5408\u6210\u5728\u5355\u4e2a\u540e\u53f0 isolate \u5185\u5b8c\u6210（\u53cc\u9762\u6e32\u67d3 \u2192 A4 \u5408\u6210 \u2192 \u53ef\u9009\u6c34\u5370 \u2192 \u7f16\u7801），<\/span>
          \n\/\/\/ \u907f\u514d\u591a\u6b21 isolate \u5f80\u8fd4\u4e0e\u4e2d\u95f4 JPEG \u53cd\u590d\u7f16\u89e3\u7801\u3002<\/span>
          \nclass<\/span> IdCopyService<\/span> {<\/span>
          \n static<\/span> Future<\/span><<\/span>ProcessResult<\/span>><\/span><\/span> renderSide<\/span>(<\/span>{<\/span>.<\/span>.<\/span>.<\/span>}<\/span>)<\/span> =<\/span>><\/span> processPageImage<\/span>(<\/span>.<\/span>.<\/span>.<\/span>)<\/span>;<\/span><\/p>\n

          static<\/span> Future<\/span><<\/span>Uint8List<\/span>?<\/span>><\/span><\/span> compose<\/span>(<\/span>{<\/span>
          \n required String<\/span> frontPath,<\/span>
          \n required String<\/span> backPath,<\/span>
          \n required List<\/span><<\/span>P2><\/span><\/span> frontCorners,<\/span>
          \n required List<\/span><<\/span>P2><\/span><\/span> backCorners,<\/span>
          \n required bool stacked,<\/span>
          \n required int dpi,<\/span>
          \n int jpegQuality =<\/span> 92<\/span>,<\/span>
          \n int sideMaxDim =<\/span> 2600<\/span>,<\/span>
          \n img.<\/span><\/span>Image<\/span>?<\/span> watermarkTile,<\/span>
          \n double watermarkOpacity =<\/span> 0.16<\/span>,<\/span>
          \n double watermarkStep =<\/span> 2.4<\/span>,<\/span>
          \n PageSettings<\/span>?<\/span> frontSettings,<\/span>
          \n PageSettings<\/span>?<\/span> backSettings,<\/span>
          \n }<\/span>)<\/span> async<\/span> {<\/span> .<\/span>.<\/span>.<\/span> }<\/span>
          \n}<\/span><\/p>\n

          6.2 compose \u65b9\u6cd5\u5b8c\u6574\u6d41\u7a0b<\/h4>\n

          static<\/span> Future<\/span><<\/span>Uint8List<\/span>?<\/span>><\/span><\/span> compose<\/span>(<\/span>{<\/span>
          \n required String<\/span> frontPath,<\/span>
          \n required String<\/span> backPath,<\/span>
          \n required List<\/span><<\/span>P2><\/span><\/span> frontCorners,<\/span>
          \n required List<\/span><<\/span>P2><\/span><\/span> backCorners,<\/span>
          \n required bool stacked,<\/span>
          \n required int dpi,<\/span>
          \n int jpegQuality =<\/span> 92<\/span>,<\/span>
          \n int sideMaxDim =<\/span> 2600<\/span>,<\/span>
          \n img.<\/span><\/span>Image<\/span>?<\/span> watermarkTile,<\/span>
          \n double watermarkOpacity =<\/span> 0.16<\/span>,<\/span>
          \n double watermarkStep =<\/span> 2.4<\/span>,<\/span>
          \n PageSettings<\/span>?<\/span> frontSettings,<\/span>
          \n PageSettings<\/span>?<\/span> backSettings,<\/span>
          \n}<\/span>)<\/span> async<\/span> {<\/span>
          \n final<\/span> fs =<\/span> frontSettings ?<\/span>?<\/span> sideSettings<\/span>(<\/span>frontCorners)<\/span>;<\/span>
          \n final<\/span> bs =<\/span> backSettings ?<\/span>?<\/span> sideSettings<\/span>(<\/span>backCorners)<\/span>;<\/span>
          \n \/\/ \u6c34\u5370\u56fe\u5757\u8f6c\u6210\u539f\u59cb RGBA \u5b57\u8282\u518d\u8fdb isolate：img.Image \u4e0d\u4f5c\u4e3a\u95ed\u5305\u6355\u83b7，<\/span>
          \n \/\/ \u907f\u514d\u8de8 isolate \u5e8f\u5217\u5316\u95ee\u9898\u3002<\/span>
          \n final<\/span> hasTile =<\/span> watermarkTile !=<\/span> null<\/span>;<\/span>
          \n final<\/span> tileRgba =<\/span> watermarkTile?<\/span>.<\/span>toUint8List<\/span>(<\/span>)<\/span>;<\/span>
          \n final<\/span> tileW =<\/span> watermarkTile?<\/span>.<\/span>width ?<\/span>?<\/span> 0<\/span>;<\/span>
          \n final<\/span> tileH =<\/span> watermarkTile?<\/span>.<\/span>height ?<\/span>?<\/span> 0<\/span>;<\/span><\/p>\n

          Uint8List<\/span>?<\/span> task<\/span>(<\/span>)<\/span> {<\/span>
          \n \/\/ 1) \u6e32\u67d3\u6b63\u9762（\u88c1\u8fb9 + \u900f\u89c6\u77eb\u6b63 + \u589e\u5f3a\u6ee4\u955c）<\/span>
          \n final<\/span> rF =<\/span> processPageImageSync<\/span>(<\/span>
          \n originalPath:<\/span> frontPath,<\/span> s:<\/span> fs,<\/span>
          \n maxDim:<\/span> sideMaxDim,<\/span> jpegQuality:<\/span> 92<\/span>,<\/span>
          \n )<\/span>;<\/span>
          \n \/\/ 2) \u6e32\u67d3\u53cd\u9762<\/span>
          \n final<\/span> rB =<\/span> processPageImageSync<\/span>(<\/span>
          \n originalPath:<\/span> backPath,<\/span> s:<\/span> bs,<\/span>
          \n maxDim:<\/span> sideMaxDim,<\/span> jpegQuality:<\/span> 92<\/span>,<\/span>
          \n )<\/span>;<\/span>
          \n final<\/span> fImg =<\/span> decodeImageNormalized<\/span>(<\/span>rF.<\/span>jpeg)<\/span>;<\/span>
          \n final<\/span> bImg =<\/span> decodeImageNormalized<\/span>(<\/span>rB.<\/span>jpeg)<\/span>;<\/span>
          \n if<\/span> (<\/span>fImg ==<\/span> null<\/span> ||<\/span> bImg ==<\/span> null<\/span>)<\/span> return<\/span> null<\/span>;<\/span><\/p>\n

          \/\/ 3) \u5408\u6210\u5230 A4 \u753b\u5e03<\/span>
          \n final<\/span> canvas =<\/span>
          \n composeIdToA4<\/span>(<\/span>front:<\/span> fImg,<\/span> back:<\/span> bImg,<\/span> stacked:<\/span> stacked,<\/span> dpi:<\/span> dpi)<\/span>;<\/span><\/p>\n

          \/\/ 4) \u53ef\u9009：\u53e0\u52a0\u9632\u6ee5\u7528\u6c34\u5370<\/span>
          \n if<\/span> (<\/span>hasTile &&<\/span> tileRgba !=<\/span> null<\/span> &&<\/span> tileW ><\/span> 0<\/span> &&<\/span> tileH ><\/span> 0<\/span>)<\/span> {<\/span>
          \n final<\/span> tile =<\/span> img.<\/span><\/span>Image<\/span>.<\/span>fromBytes<\/span>(<\/span>
          \n width:<\/span> tileW,<\/span> height:<\/span> tileH,<\/span>
          \n bytes:<\/span> tileRgba.<\/span>buffer,<\/span> numChannels:<\/span> 4<\/span>,<\/span>
          \n )<\/span>;<\/span>
          \n WatermarkService<\/span>.<\/span>stampWatermarkTile<\/span>(<\/span>
          \n canvas,<\/span> tile,<\/span>
          \n opacity:<\/span> watermarkOpacity,<\/span>
          \n step:<\/span> watermarkStep,<\/span>
          \n )<\/span>;<\/span>
          \n }<\/span>
          \n \/\/ 5) \u7f16\u7801\u4e3a JPEG<\/span>
          \n return<\/span> img.<\/span>encodeJpg<\/span>(<\/span>canvas,<\/span> quality:<\/span> jpegQuality)<\/span>;<\/span>
          \n }<\/span><\/p>\n

          try<\/span> {<\/span>
          \n if<\/span> (<\/span>kIsWeb)<\/span> return<\/span> task<\/span>(<\/span>)<\/span>;<\/span>
          \n return<\/span> await<\/span> Isolate<\/span>.<\/span>run<\/span>(<\/span>task)<\/span>;<\/span>
          \n }<\/span> catch<\/span> (<\/span>_)<\/span> {<\/span>
          \n try<\/span> {<\/span> return<\/span> task<\/span>(<\/span>)<\/span>;<\/span> }<\/span> catch<\/span> (<\/span>_)<\/span> {<\/span> return<\/span> null<\/span>;<\/span> }<\/span>
          \n }<\/span>
          \n}<\/span><\/p>\n

          6.3 \u5355 Isolate \u5168\u6d41\u7a0b\u8bbe\u8ba1<\/h4>\n

          \u6574\u4e2a\u5408\u6210\u6d41\u7a0b\u5728\u5355\u4e2a\u540e\u53f0 isolate \u5185\u5b8c\u6210：<\/p>\n

          Isolate \u5185\u6267\u884c：
          \n \u6b63\u9762\u6e32\u67d3（\u88c1\u8fb9+\u900f\u89c6+\u6ee4\u955c）
          \n \u53cd\u9762\u6e32\u67d3（\u88c1\u8fb9+\u900f\u89c6+\u6ee4\u955c）
          \n A4 \u5408\u6210（composeIdToA4）
          \n \u53ef\u9009：\u6c34\u5370\u5e73\u94fa（WatermarkService.stampWatermarkTile）
          \n JPEG \u7f16\u7801
          \n \u2192 \u8fd4\u56de Uint8List<\/p>\n

          \u4e3a\u4ec0\u4e48\u653e\u5728\u540c\u4e00\u4e2a isolate？<\/p>\n

            \n
          • \u907f\u514d\u591a\u6b21 isolate \u5f80\u8fd4：\u6bcf\u542f\u52a8\u4e00\u6b21 isolate \u90fd\u6709\u5f00\u9500，\u628a\u6240\u6709\u6b65\u9aa4\u6253\u5305\u53ea\u542f\u52a8\u4e00\u6b21<\/li>\n
          • \u907f\u514d\u4e2d\u95f4 JPEG \u53cd\u590d\u7f16\u89e3\u7801：\u5982\u679c\u6b63\u9762\u6e32\u67d3\u5728\u4e00\u4e2a isolate\u3001A4 \u5408\u6210\u5728\u53e6\u4e00\u4e2a，\u4e2d\u95f4\u9700\u8981 JPEG \u7f16\u7801\u2192\u89e3\u7801，\u65e2\u8017\u65f6\u95f4\u53c8\u635f\u5931\u753b\u8d28<\/li>\n
          • \u6c34\u5370\u56fe\u5757\u7279\u6b8a\u5904\u7406：watermarkTile \u662f\u4e3b isolate \u6e32\u67d3\u7684 img.Image，\u4e0d\u80fd\u76f4\u63a5\u8de8 isolate \u4f20\u9012，\u6240\u4ee5\u5148\u8f6c\u6210 Uint8List \u518d\u4f20\u5165<\/li>\n<\/ul>\n

            6.4 \u6c34\u5370\u96c6\u6210<\/h4>\n

            \u6c34\u5370\u7531 WatermarkService \u63d0\u4f9b，\u5728 A4 \u5408\u6210\u5b8c\u6210\u540e\u53e0\u52a0：<\/p>\n

            WatermarkService<\/span>.<\/span>stampWatermarkTile<\/span>(<\/span>
            \n canvas,<\/span> tile,<\/span>
            \n opacity:<\/span> watermarkOpacity,<\/span> \/\/ \u9ed8\u8ba4 0.16<\/span>
            \n step:<\/span> watermarkStep,<\/span> \/\/ \u9ed8\u8ba4 2.4<\/span>
            \n)<\/span>;<\/span><\/p>\n

            \u8bc1\u4ef6\u590d\u5370\u573a\u666f\u7684\u6c34\u5370\u53c2\u6570：<\/p>\n\n\u53c2\u6570\u9ed8\u8ba4\u503c\u8bf4\u660e<\/tr>\n\n\n\n
            opacity<\/td>\n0.16<\/td>\n\u8f83\u4f4e\u900f\u660e\u5ea6，\u4e0d\u906e\u6321\u8bc1\u4ef6\u4fe1\u606f\u4f46\u6709\u9632\u6ee5\u7528\u6548\u679c<\/td>\n<\/tr>\n
            step<\/td>\n2.4<\/td>\n\u7a0d\u758f\u7684\u5bc6\u5ea6，A4 \u5927\u9762\u79ef\u4e0b\u89c6\u89c9\u66f4\u8212\u9002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            \u6c34\u5370\u56fe\u5757\u7531\u8c03\u7528\u65b9\u5728\u4e3b isolate \u9884\u5148\u901a\u8fc7 WatermarkService.renderWatermarkTile \u6e32\u67d3，\u5b57\u53f7\u6309\u76ee\u6807 dpi \u7684\u753b\u5e03\u5bbd\u5ea6\u6362\u7b97\u3002<\/p>\n

            \n

            \u4e03\u3001sideSettings：\u8bc1\u4ef6\u88c1\u526a\u9ed8\u8ba4\u914d\u7f6e<\/h3>\n

            \/\/\/ \u8bc1\u4ef6\u88c1\u526a\u9ed8\u8ba4\u4f7f\u7528\u300c\u589e\u5f3a\u300d\u6ee4\u955c：\u767d\u5e95\u52a0\u6df1\u3001\u6587\u5b57\u9510\u5316，\u9002\u5408\u590d\u5370\u89c2\u611f\u3002<\/span>
            \nstatic<\/span> PageSettings<\/span> sideSettings<\/span>(<\/span>List<\/span><<\/span>P2><\/span><\/span> corners)<\/span> =<\/span>><\/span> PageSettings<\/span>(<\/span>
            \n applyCrop:<\/span> true<\/span>,<\/span>
            \n corners:<\/span> corners,<\/span>
            \n filter:<\/span> FilterMode<\/span>.<\/span>enhanced,<\/span>
            \n )<\/span>;<\/span><\/p>\n

            \u8bc1\u4ef6\u590d\u5370\u9ed8\u8ba4\u4f7f\u7528 enhanced（\u589e\u5f3a）\u6ee4\u955c\u2014\u2014\u767d\u5e95\u52a0\u6df1\u3001\u6587\u5b57\u9510\u5316，\u6a21\u62df\u590d\u5370\u673a\u7684"\u52a0\u6df1"\u6548\u679c，\u8ba9\u8bc1\u4ef6\u9ed1\u767d\u5206\u660e，\u6253\u5370\u51fa\u6765\u66f4\u6e05\u6670\u3002<\/p>\n

            \n

            \u516b\u3001\u6027\u80fd\u6570\u636e<\/h3>\n

            300dpi \u5bfc\u51fa（A4 = 2480\u00d73508px），iPhone 13 \u5b9e\u6d4b：<\/p>\n\n\u6b65\u9aa4\u8017\u65f6<\/tr>\n\n\n\n\n\n\n\n\n
            \u6b63\u9762\u6e32\u67d3（\u88c1\u8fb9+\u900f\u89c6+\u6ee4\u955c）<\/td>\n~80ms<\/td>\n<\/tr>\n
            \u53cd\u9762\u6e32\u67d3（\u88c1\u8fb9+\u900f\u89c6+\u6ee4\u955c）<\/td>\n~80ms<\/td>\n<\/tr>\n
            A4 \u5408\u6210（composeIdToA4）<\/td>\n~20ms<\/td>\n<\/tr>\n
            \u6c34\u5370\u5e73\u94fa（\u53ef\u9009）<\/td>\n~150ms<\/td>\n<\/tr>\n
            JPEG \u7f16\u7801<\/td>\n~60ms<\/td>\n<\/tr>\n
            \u603b\u8017\u65f6（\u65e0\u6c34\u5370）<\/td>\n~240ms<\/td>\n<\/tr>\n
            \u603b\u8017\u65f6（\u542b\u6c34\u5370）<\/td>\n~390ms<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            130dpi \u9884\u89c8\u5219\u5feb\u5f97\u591a，\u6574\u4f53\u5728 100ms \u4ee5\u5185，\u53ef\u652f\u6491\u5b9e\u65f6\u4ea4\u4e92\u3002<\/p>\n

            \n

            \u4e5d\u3001\u6253\u5370\u9002\u914d\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h3>\n

            9.1 \u5c3a\u5bf8\u9a8c\u8bc1<\/h4>\n

            \u751f\u6210\u7684 A4 \u56fe\u50cf\u5728 300dpi \u4e0b\u7684\u50cf\u7d20\u5c3a\u5bf8：<\/p>\n\n\u5bf9\u8c61\u50cf\u7d20\u5c3a\u5bf8\u7269\u7406\u5c3a\u5bf8<\/tr>\n\n\n\n\n
            A4 \u753b\u5e03<\/td>\n2480\u00d73508px<\/td>\n210\u00d7297mm<\/td>\n<\/tr>\n
            \u8bc1\u4ef6<\/td>\n~1011\u00d7638px<\/td>\n85.6\u00d754mm<\/td>\n<\/tr>\n
            \u95f4\u8ddd<\/td>\n~94px<\/td>\n8mm<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            9.2 \u6253\u5370\u673a\u8bbe\u7f6e\u5efa\u8bae<\/h4>\n\n\u8bbe\u7f6e\u9879\u63a8\u8350\u503c\u539f\u56e0<\/tr>\n\n\n\n\n\n\n
            \u7eb8\u5f20\u5c3a\u5bf8<\/td>\nA4<\/td>\n\u6807\u51c6\u7eb8\u5f20<\/td>\n<\/tr>\n
            \u6253\u5370\u8d28\u91cf<\/td>\n\u9ad8（300dpi+）<\/td>\n\u786e\u4fdd\u8bc1\u4ef6\u6587\u5b57\u6e05\u6670<\/td>\n<\/tr>\n
            \u7f29\u653e<\/td>\n100%（\u5b9e\u9645\u5c3a\u5bf8）<\/td>\n\u5426\u5219\u8bc1\u4ef6\u5c3a\u5bf8\u4f1a\u53d8\u5f62<\/td>\n<\/tr>\n
            \u53cc\u9762\u6253\u5370<\/td>\n\u5426<\/td>\n\u5355\u9762\u5373\u53ef<\/td>\n<\/tr>\n
            \u7eb8\u5f20\u7c7b\u578b<\/td>\n\u666e\u901a\u7eb8<\/td>\n\u8bc1\u4ef6\u590d\u5370\u4e0d\u9700\u8981\u7167\u7247\u7eb8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            \u91cd\u8981\u63d0\u9192： \u5f88\u591a\u6253\u5370\u673a\u9ed8\u8ba4\u4f1a"\u9002\u5408\u9875\u9762"\u7f29\u653e，\u5bfc\u81f4\u8f93\u51fa\u5c3a\u5bf8\u4e0d\u7b49\u4e8e\u8bbe\u8ba1\u5c3a\u5bf8\u3002\u52a1\u5fc5\u63d0\u9192\u7528\u6237\u5173\u95ed\u81ea\u52a8\u7f29\u653e，\u9009\u62e9"\u5b9e\u9645\u5c3a\u5bf8"\u6216"100%"\u6253\u5370，\u624d\u80fd\u4fdd\u8bc1\u8bc1\u4ef6 1:1 \u7269\u7406\u5c3a\u5bf8\u3002<\/p>\n

            \n

            \u5341\u3001\u8e29\u5751\u603b\u7ed3<\/h3>\n
              \n
            • \u8f93\u5165\u662f img.Image \u5bf9\u8c61\u4e0d\u662f\u6587\u4ef6\u8def\u5f84\u2014\u2014\u8c03\u7528\u65b9\u5df2\u7ecf\u505a\u4e86\u626b\u63cf\u5904\u7406，\u76f4\u63a5\u4f20\u5185\u5b58\u56fe\u50cf\u907f\u514d\u91cd\u590d\u7f16\u89e3\u7801；<\/li>\n
            • \u53c2\u6570\u540d\u662f stacked \u4e0d\u662f vertical\u2014\u2014"\u5806\u53e0"\u66f4\u51c6\u786e\u63cf\u8ff0\u4e0a\u4e0b\u6392\u5217\u7684\u5173\u7cfb，\u6a2a\u6392\u65f6\u662f\u5e76\u5217\u4e0d\u662f\u6c34\u5e73；<\/li>\n
            • \u8bc1\u4ef6\u95f4\u8ddd\u662f 8mm \u4e0d\u662f 10mm\u2014\u20148mm \u5728 A4 \u7eb8\u4e0a\u89c6\u89c9\u6bd4\u4f8b\u66f4\u8212\u9002，\u4e5f\u7b26\u5408\u5e38\u89c1\u590d\u5370\u4e60\u60ef；<\/li>\n
            • \u6574\u7ec4\u5782\u76f4\u5c45\u4e2d\u800c\u4e0d\u662f\u56fa\u5b9a\u4e0a\u8fb9\u8ddd\u2014\u2014\u5c45\u4e2d\u89c6\u89c9\u66f4\u5e73\u8861，\u4e5f\u7701\u53bb"\u4e0a\u8fb9\u8ddd\u8bbe\u591a\u5c11\u5408\u9002"\u7684\u7ea0\u7ed3；<\/li>\n
            • \u7f29\u653e\u7528 math.min \u53d6\u8f83\u5c0f\u6bd4\u4f8b\u2014\u2014\u4fdd\u6301\u5bbd\u9ad8\u6bd4，\u8bc1\u4ef6\u4e0d\u4f1a\u88ab\u62c9\u4f38\u53d8\u5f62，\u7559\u767d\u5747\u5300；<\/li>\n
            • \u6c34\u5370\u56fe\u5757\u8981\u5148\u8f6c\u6210 Uint8List \u518d\u8fdb isolate\u2014\u2014img.Image \u5bf9\u8c61\u4e0d\u80fd\u76f4\u63a5\u8de8 isolate \u5e8f\u5217\u5316；<\/li>\n
            • \u6574\u4e2a\u5408\u6210\u6d41\u7a0b\u5728\u5355\u4e2a isolate \u5185\u5b8c\u6210\u2014\u2014\u907f\u514d\u591a\u6b21 isolate \u542f\u52a8\u5f00\u9500\u548c\u4e2d\u95f4 JPEG \u53cd\u590d\u7f16\u89e3\u7801；<\/li>\n
            • \u6ee4\u955c\u9ed8\u8ba4\u7528 enhanced \u589e\u5f3a\u6a21\u5f0f\u2014\u2014\u8bc1\u4ef6\u590d\u5370\u9700\u8981\u9ed1\u767d\u5206\u660e，\u589e\u5f3a\u6ee4\u955c\u7684\u767d\u5e95\u52a0\u6df1+\u6587\u5b57\u9510\u5316\u6548\u679c\u6700\u5408\u9002；<\/li>\n
            • DPI \u662f\u53c2\u6570\u800c\u4e0d\u662f\u5e38\u91cf\u2014\u2014\u9884\u89c8\u7528\u4f4e DPI（~130）\u4fdd\u8bc1\u6d41\u7545，\u5bfc\u51fa\u7528\u9ad8 DPI（300）\u4fdd\u8bc1\u6253\u5370\u6e05\u6670\u3002<\/li>\n<\/ul>\n

              \u8bc1\u4ef6\u5408\u6210 A4 \u770b\u4f3c\u53ea\u662f"\u628a\u4e24\u5f20\u56fe\u8d34\u5230\u4e00\u5f20\u767d\u7eb8\u4e0a"，\u4f46\u8981\u505a\u5230"1:1 \u7269\u7406\u5c3a\u5bf8 + \u7b49\u6bd4\u7f29\u653e\u4e0d\u53d8\u5f62 + \u6574\u7ec4\u5c45\u4e2d\u7f8e\u89c2 + \u6c34\u5370\u96c6\u6210 + \u5355isolate\u9ad8\u6027\u80fd"，\u6bcf\u4e00\u4e2a\u7ec6\u8282\u90fd\u9700\u8981\u4ed4\u7ec6\u8003\u91cf\u3002composeIdToA4 \u867d\u7136\u53ea\u6709 50 \u591a\u884c\u4ee3\u7801，\u4f46\u80cc\u540e\u662f\u5bf9\u6253\u5370\u7269\u7406\u5c3a\u5bf8\u3001\u7528\u6237\u4f53\u9a8c\u548c\u6027\u80fd\u7684\u5168\u9762\u628a\u63a7\u3002<\/p>\n

              \n

              🔔 \u5b8c\u6574\u6e90\u7801\u5373\u5c06\u4e0a\u67b6<\/p>\n

              \u672c\u7cfb\u5217\u5230\u6b64\u5b8c\u7ed3\u3002\u4ece\u8bc1\u4ef6\u7167\u80cc\u666f\u66ff\u6362\u3001\u7ea2\u5370\u7ae0\u4fdd\u7559\u3001\u6c61\u70b9\u4fee\u590d\u3001\u79bb\u7ebf OCR\u3001\u6781\u9650\u538b\u7f29\u3001\u9632\u6ee5\u7528\u6c34\u5370\u5230\u8bc1\u4ef6 A4 \u5408\u6210，\u201c\u5b89\u5fc3\u626b\u63cf\u201d App \u7684\u6838\u5fc3\u6280\u672f\u94fe\u8def\u5df2\u5168\u90e8\u62c6\u89e3\u5b8c\u6bd5\u3002\u5b8c\u6574\u6e90\u7801\u5373\u5c06\u4e0a\u67b6，\u656c\u8bf7\u5173\u6ce8\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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