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68 lines
2.6 KiB
Markdown
68 lines
2.6 KiB
Markdown
# Example (JKQTMathText): A simple usage example {#JKQTMathTextSimpleExample}
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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_simpletest/`) simply creates a QLabel (as a new window) that displays a rendered LaTeX equation (here the time-dependent Schrödinger equation).
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The QMake project looks like this (see [`jkqtmathtext_simpletest.pro`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/jkqtmathtext_simpletest/jkqtmathtext_simpletest.pro):
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```.qmake
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# include JKQTMathText source-code, including the open-source XITS fonts
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include(../../lib/jkqtmathtext_with_xits.pri)
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SOURCES += jkqtmathtext_simpletest.cpp
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# if you don't want to use the XITS fonts, use this line (and uncomment the
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# last two line!):
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#include(../../lib/jkqtmathtext.pri)
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CONFIG += qt
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QT += core gui
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
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TARGET = jkqtmathtext_simpletest
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```
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And the source code of the main application is (see [`jkqtmathtext_simpletest.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/jkqtmathtext_simpletest/jkqtmathtext_simpletest.cpp):
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```.cpp
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#include <QApplication>
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#include <QLabel>
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#include <QPixmap>
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#include "jkqtmathtext/jkqtmathtext.h"
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int main(int argc, char* argv[])
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{
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QApplication app(argc, argv);
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// we use a simple label to display the math text
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QLabel lab;
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// 1. we will paint into a QPixmap
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QPixmap pix(600,400);
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pix.fill(QColor("white"));
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QPainter painter;
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// 2. now we create a JKQTMathText object.
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// Also we configure the JKQTMathText to use the XITS fonts that
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// were included in the *.pro-file
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JKQTMathText mathText;
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mathText.useXITS();
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mathText.setFontSize(20);
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// 3. now we parse some LaTeX code (the Schroedinger's equation), so
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// we can draw it onto the QPixmap in the next step
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mathText.parse("$\\left[-\\frac{\\hbar^2}{2m}\\frac{\\partial^2}{\\partial x^2}+V(x)\\right]\\Psi(x)=\\mathrm{i}\\hbar\\frac{\\partial}{\\partial t}\\Psi(x)$");
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// 3. here we do the painting
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painter.begin(&pix);
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mathText.draw(painter, Qt::AlignCenter, QRectF(0,0,pix.width(), pix.height()), false);
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painter.end();
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// now we display and resize the label as a window
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lab.setPixmap(pix);
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lab.show();
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lab.resize(600,400);
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return app.exec();
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}
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```
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The result looks like this:
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