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浅谈PDFlib中文输出(五)

敬业的IT人 互联网 佚名 2008-1-4 18:37:15

一般来说, 每种基本字体, 都会有在其基础上变化字形的附加字体。比如,字体Arial, 就有其附加字体Arial Bold (粗体), Arial Italic(斜体), 及Arial Bold Italic(粗斜体)。一般你都可以找到或购买到相应的附加字体。
但有时为了应急,或对字体字形没有非常严格的要求。在这样的情况下,我们可以采用人工字形生成(Artificial font styles)。Artificial font styles是Acrobat的一个功能,它根据基本字形而模拟生成粗体,斜体及粗斜体。PDFlib支持这一功能,并遵守Acrobat对此功能的限制。目前此功能之局限于:
1. Acrobat标准字体, 就简体中文来说也就是PDFlib自带的STSong-Light,AdobeSongStd-Light-Acro,及STSongStd-Light-Acro三种简体中文字体。
2. PDFlib可以访问的.otf OpenType字体,并使用表1.1的编码(见《浅谈PDFlib中文输出(一)》), 且“embedding”参数设为假。

下面是一个相关的例子--C 源程序(附上生成的pdf文件 –PDFlib_cs5.pdf)。

/*******************************************************************//* This example demostrates the usage of Artificial font styles/* under Chinese Simplifed Windows./*******************************************************************/#include <stdio.h>#include <stdlib.h>#include <string.h>#include "pdflib.h"int main(void){PDF             *p = NULL;int                Font_H = 0, Font_CS = 0, Left = 50, y = 700;const int       INCRY = 25;const char     TextUnicode[] = "\x80\x7B\x53\x4F\x2D\x4E\x87\x65";const int        TEXTLEN = 8;/* create a new PDFlib object */if ((p = PDF_new()) == (PDF *) 0){printf("Couldn't create PDFlib object (out of memory)!\n");return(2);}PDF_TRY(p) {if (PDF_begin_document(p, "pdflib_cs5.pdf", 0, "") == -1){printf("Error: %s\n", PDF_get_errmsg(p));return(2);}PDF_set_info(p, "Creator", "pdflib_cs5.c");PDF_set_info(p, "Author", "myi@pdflib.com");PDF_set_info(p, "Title", "Usage of Artificial font styles");/* Start a new page. */PDF_begin_page_ext(p, a4_width, a4_height, "");Font_H = PDF_load_font(p, "Helvetica-Bold", 0, "winansi", "");PDF_setfont(p, Font_H, 24);PDF_show_xy(p, "Artificial Font Styles", Left   100,  y);/* Normal */y -= 2 * INCRY;PDF_setfont(p, Font_H, 14);PDF_show_xy(p, "Normal", Left,  y);y -= INCRY;Font_CS = PDF_load_font(p, "STSong-Light", 0, "UniGB-UCS2-H", "");PDF_setfont(p, Font_CS, 14);PDF_show_xy2(p, TextUnicode, TEXTLEN, Left,  y);/* Italic */y -= 2 * INCRY;PDF_setfont(p, Font_H, 14);PDF_show_xy(p, "Italic", Left,  y);y -= INCRY;Font_CS = PDF_load_font(p, "STSong-Light", 0, "UniGB-UCS2-H", "fontstyle italic");PDF_setfont(p, Font_CS, 14);PDF_show_xy2(p, TextUnicode, TEXTLEN, Left,  y);/* Bold */y -= 2 * INCRY;PDF_setfont(p, Font_H, 14);PDF_show_xy(p, "Bold", Left,  y);y -= INCRY;Font_CS = PDF_load_font(p, "STSong-Light", 0, "UniGB-UCS2-H", "fontstyle bold");PDF_setfont(p, Font_CS, 14);PDF_show_xy2(p, TextUnicode, TEXTLEN, Left,  y);/* Bold-italic */y -= 2 * INCRY;PDF_setfont(p, Font_H, 14);PDF_show_xy(p, "Bold-italic", Left,  y);y -= INCRY;Font_CS = PDF_load_font(p, "STSong-Light", 0, "UniGB-UCS2-H","fontstyle bolditalic");PDF_setfont(p, Font_CS, 14);PDF_show_xy2(p, TextUnicode, TEXTLEN, Left,  y);/* End of page. */PDF_end_page_ext(p, "");PDF_end_document(p, "");}PDF_CATCH(p) {printf("PDFlib exception occurred in pdflib_cs5 sample:\n");printf("[%d] %s: %s\n",  PDF_get_errnum(p),  PDF_get_apiname(p),PDF_get_errmsg(p));PDF_delete(p);return(2);}PDF_delete(p);return 0;}

相关链接:


PDFLIB官方网站: http://www.pdflib.com
PDFLIB官方下载专页:http://www.pdflib.com/products/pdflib/download/index.html
VC知识库PDFLIB下载:http://www.vckbase.com/tools

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