如何在 postscript 文件上制作程序覆盖文本? [英] How can I make a program overlay text on a postscript file?

问题描述

我有一些 postscript 格式的图表，由 gnuplot 生成.我需要在图表上放置一些识别信息.我如何编写一些指令来做到这一点?我想在图表的右上角写一个数字(一个 .ps 文件).

I have some graphs in postscript format, generated by gnuplot. I need to place some identifying information on the graph. How can I script some instructions to do that? I want to write a number at the top right corner of the graph (a .ps file).

推荐答案

好的，您链接到的示例文件运行良好(并且没有重新定义 showpage 运算符).

Ok, the example file you linked to is well behaving (and has not re-defined the showpage operator).

所以我现在假设如下:

1. 您所有的 .ps 文件都类似于您的示例文件.
2. 您所有的 .ps 文件都只有一页(如 .eps 文件).
3. 您所有的文件名都类似于 gnp-NNN.ps(就像 gnp-544.ps 一样).
4. 您希望出现在右上角的数字是来自文件名的 NNN.

1. All your .ps files are similar to your example file.
2. All your .ps files are 1 page only (like .eps files).
3. All your filenames are like constructed as gnp-NNN.ps (like gnp-544.ps is).
4. The number you want to appear in the top right corner is NNN from the filename.

我还假设您安装了 Ghostscript，它是 最新版本，8.71.我目前使用的是 Windows -- 如果您使用的是 Linux/Unix，只需将 gswin32c.exe 替换为 gs 和所有行结尾 ^通过 .

I also assume you have Ghostscript installed, and it is the most recent version, 8.71. I'm currently on Windows -- if you're on Linux/Unix, just replace gswin32c.exe by gs and all line endings ^ by .

现在先试试这个命令:

gswin32c.exe ^
 -o gnp-with-number-544.pdf ^
 -sDEVICE=pdfwrite ^
 -g5030x5320 ^
 -c "/Helvetica-Italic findfont 15 scalefont setfont 453 482 moveto (544) show" ^
 -f gnp-544.ps

并查看结果 gnp-with-number-544.pdf 是否符合您的要求.

and see if the resulting gnp-with-number-544.pdf looks like you want it.

-c "..." 用于将 PostScript 片段传递给 Ghostscript 并使其与主 .ps 文件一起处理这些文件，然后将其作为下一个参数，使用 -f ....

The -c "..." is used to pass PostScript snippets to Ghostscript and make it process these together with the main .ps file which has then to follow as next parameter, with -f ....

可以修改参数:

• 将 /Helvetica-Italic 字体名替换为 /Helvetica、/Courier、/Times、Helvetica-Bold 或任何你可用和喜​​欢的.
• 或修改字体大小:15 此处表示 15 点(在 PDF 中 72 点 == 1 英寸).
• 或者改变位置:453 482将PostScript当前点移动到向左453点，向上482点"(与oringin 0,0 设置为左​​下角).
• 或调整媒体大小:-g5030x5320 为您提供 503x532 点(由于 -sDEVICE=pdfwrite 使用的默认分辨率为 720 dpi.
• 或者将要打印的字符串设置为(File No. 544) show 或任何你想要的.

• Replace the /Helvetica-Italic fontname by /Helvetica, /Courier, /Times, Helvetica-Bold or whatever you've available and prefer.
• Or modify the fontsize: 15 here means 15 points (in PDF 72 points == 1 inch).
• Or change the position: 453 482 moves the PostScript currentpoint to "453 points to the left, 482 points to the top" (with the oringin 0,0 set to the bottom left corner).
• Or tweak the media size: -g5030x5320 gives you 503x532 points (due to the default resolution of 720 dpi used by -sDEVICE=pdfwrite.
• Or set the string being printed to (File No. 544) show or whatever you want.

您还可以添加相当多的参数来调整输出文件的质量(分辨率、字体嵌入等)，但现在就这些.

You could also add quite a few parameters to tweak the quality of the output file (resolution, font embedding etc.), but these ones will do for now.

如果您出于某种原因需要 PostScript 输出而不是 PDF，请像这样更改命令:

Should you need PostScript output for some reason instead of PDF, change the command like this:

gswin32c.exe ^
 -o gnp-with-number-544.ps ^
 -sDEVICE=ps2write ^
 -g5030x5320 ^
 -c "/Helvetica-Italic findfont 15 scalefont setfont 453 482 moveto (544) show" ^
 -f gnp-544.ps

批量转换大量文件

现在，如何批量转换这个?对于最后一步，我假设:

Batch-convert Lots of Files

Now, how to batch-convert this? For this last step, I'm assuming:

1. 您的 NNN 编号方案未使用前导 0.
2. 您要转换的文件范围是 gnp-1.ps..gnp-1000.ps.
3. 您想要添加数字的 PDF 输出，而不是 PS.

1. your NNN numbering scheme is not using leading 0s.
2. your range of files to be converted is gnp-1.ps..gnp-1000.ps.
3. you want PDF output with the numbers added, not PS.

在 Windows 上，使用以下内容创建一个 addnumbers-make-pdf.bat 文件:

On Windows, create an addnumbers-make-pdf.bat file with this content:

gswin32c.exe ^
-o gnp-with-number-%1.pdf ^
-sDEVICE=pdfwrite ^
-g5030x5320 ^
-c "/Helvetica-Italic findfont 15 scalefont setfont 453 482 moveto (%1) show" ^
-f gnp-%1.ps

现在在 cmd.exe 控制台中运行这个命令:

Now run this command in a cmd.exe console:

for /l %i in (1,1,100) do (addnumbers-make-pdfvim.bat %i)

在 Linux 上，使用以下内容创建一个 addnumbers-make-pdf.sh Bash shell 脚本:

On Linux, create an addnumbers-make-pdf.sh Bash shell script with this content:

#!/bin/bash
gs 
-o gnp-with-number-${1}.pdf 
-sDEVICE=pdfwrite 
-g5030x5320 
-c "/Helvetica-Italic findfont 15 scalefont setfont 453 482 moveto (${1}) show" 
-f gnp-${1}.ps

现在在 shell 中运行这个命令:

Now run this command in a shell:

for i in $(seq 1 1000); do addnumbers-make-pdf.sh ${i} ; done

<小时>

更新:
哈！，它甚至可以工作 ;-) 我刚刚在 Windows 上测试了它.这是原始文件和覆盖文件(PDF 格式)的屏幕截图:

---

Update:
Hah!, it even works ;-) I just tested it on Windows. Here is a screenshot with the original and the overlayed file (as PDFs):

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