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81 lines
4.4 KiB
Markdown
81 lines
4.4 KiB
Markdown
# Example (JKQTMathText): Command-Line Utility jkqtmathtext_render {#JKQTMathTextRenderCmdLineTool}
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JKQTMathText is a hand-written LaTeX-renderer for Qt (implemented in native C++, using Qt). It supports a large set of standard LaTeX markup and can render it to a QPainter.
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This project (see `./examples/jkqtmathtext_render/`) is a command-line utility that accepts a LaTeX markup string and a filename for the generated image.
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It then renders the string into the image.
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The source code of the main application can be found in [`jkqtmathtext_render.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/jkqtmathtext_render/jkqtmathtext_render.cpp).
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The major rendering portion look like this:
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First we generate dummy QPixmap that is needed to use the QPainter, that is required for determining the size of the rendering.
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```.cpp
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QPixmap pix(10,10);
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```
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Now we create a JKQTMathText object and configure it
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```.cpp
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QPainter painter;
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JKQTMathText mathText;
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if (useXITS) mathText.useXITS();
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mathText.setFontSize(fontsize);
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```
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Now we parse some LaTeX code and thus generate its memory representation.
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```.cpp
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mathText.parse(latex);
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```
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Finally we can generate a QImage with the output of the rendering algorithm and save it as a file.
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```.cpp
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const QImage pix=mathText.drawIntoImage(drawBoxes, backgroundColor, sizeincrease);
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pix.save(outputFilename);
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```
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calling this utility with the LaTeX code:
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```.sh
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> jkqtmathtext_render "$x_{1/2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$" jkqtmathtext_render_output.png
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```
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results in this output:
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The tool supports these command-line options:
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- *command-line mode*: call `jkqtmathtext_render LATEX OUTPUTFILE`
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- The extension of the `OUTPUTFILE` determines the file type. The tool supports `.png`, `.bmp`, `.jpg`, `.ppm`, `.xbm` and `.xpm`
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- *file-mode*: call `jkqtmathtext_render --inputfile=INPUTFILE.jkmt --outputdir=OUTPUTDIR`
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- The file `INPUTFILE.jkmt` is a text file with several "render jobs", deparated by `---` lines.
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- The first line in each job defines the output filename (relative to `OUTPUTDIR`)
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- The second line is optional and contains a list of altered command-line options, e.g. `--fontsize=24 --fontmathroman=XITS`, Note however that only options concerning formatting are allowed, `--verbose` or the file/directory-options will not be processed!
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- The third and further lines is concatenated to form the LaTeX markup to be rendered.
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- All modes support these command-line options:
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- `--verbose`: verbose output of the tool
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- `--sizeincrease=SIZE_PIXELS`: set the width of the additional margin around the rendering result
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- `--drawboxes`: flag that enables drawing of rectangles around each box
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- `--font=FONT_SERIF`: sets text- and math-mode serif font to `FONT_SERIF`
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- `--font=FONT_SERIF,FONT_SANS`: sets text- and math-mode serif font to `FONT_SERIF` and sans font to `FONT_SANS`
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- `--font=FONT_TEXT_SERIF,FONT_TEXT_SANS,FONT_MATH_SERIF,FONT_MATH_SANS`: sets text- and math-mode serif font to `FONT_TEXT_SERIF` and `FONT_MATH_SERIF` and sans fonts to `FONT_TEXT_SANS` and `FONT_MATH_SANS`
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- `--font=...+XITS|STIX|ASANA`: set fonts as given above and then use XITS-/STIX- or ASANA-fonts for math-roman
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- `--fontsize=SIZE_PT`: set the font-size in pt
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- `--fontroman=FONT`: set the text-mode roman font
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- `--fontsans=FONT`: set the text-mode sans font
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- `--fontmathroman=FONT`: set the math-mode roman font
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- `--fontmathsans=FONT`: set the math-mode sans font
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- `--fontblackboard=FONT`: use the given font as blackboard-font and de-activate the simulate-feature
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- `--fontblackboardmode=default|font_directly|simulate|unicode_or_font_directly|unicode_or_simulate`: use the given drawing mode for blackboard fonts
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- `--fonttypewriter=FONT`: set the typewriter font
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- `--fontscript=FONT`: set the script font
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- `--fontcaligraphic=FONT`: set the caligraphic font
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- `--fontfraktur=FONT`: set the fraktur font
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- `--fontfallbacksymbol=FONT`: set the fallback symbol font, using unicode encoding
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- `--fontfallbacksymbol_symbolencoding=FONT`: set the fallback symbol font, using WinSymbol encoding
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- `--background=COLOR`: set the background color of the output image
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- `--textcolor=COLOR`: set the text color of the output image
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