JKQTPlotter trunk/v5.0.0
an extensive Qt5+Qt6 Plotter framework (including a feature-richt plotter widget, a speed-optimized, but limited variant and a LaTeX equation renderer!), written fully in C/C++ and without external dependencies
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Example (JKQTMathText): A simple usage example

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.

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).

The source code of the main application is (see jkqtmathtext_simpletest.cpp:

#include <QApplication>
#include <QLabel>
#include <QPixmap>
#include "jkqtmathtext/jkqtmathtextlabel.h"
int main(int argc, char* argv[])
{
QApplication app(argc, argv);
// we use a simple label to display the math text
QLabel lab;
// 1. we will paint into a QPixmap
QPixmap pix(600,400);
pix.fill(QColor("white"));
QPainter painter;
// 2. now we create a JKQTMathText object.
// Also we configure the JKQTMathText to use the XITS fonts that
// were included in the *.pro-file
JKQTMathText mathText;
mathText.useXITS();
mathText.setFontSize(20);
// 3. now we parse some LaTeX code (the Schroedinger's equation), so
// we can draw it onto the QPixmap in the next step
mathText.parse("$\\left[-\\frac{\\hbar^2}{2m}\\frac{\\partial^2}{\\partial x^2}+V(x)\\right]\\Psi(x)=\\mathrm{i}\\hbar\\frac{\\partial}{\\partial t}\\Psi(x)$");
// 3. here we do the painting
painter.begin(&pix);
mathText.draw(painter, Qt::AlignCenter, QRectF(0,0,pix.width(), pix.height()), false);
painter.end();
// now we display and resize the label as a window
lab.setPixmap(pix);
lab.show();
lab.resize(600,400);
return app.exec();
}
this class parses a mathematical markup string and can then draw the contained text/equation onto a Q...
Definition jkqtmathtext.h:192
void draw(QPainter &painter, QPointF x, bool drawBoxes=false)
draw a representation to the object at the specified position x , y
bool parse(const QString &markup, DefaultParserTypes markupType=DefaultParser, ParseOptions options=DefaultParseOptions)
parse the given math markup string with a parser derived from markupType.
bool useXITS(bool mathModeOnly=true, bool useAsFallbackSymbol=true)
configures the class to use the XITS fonts in mathmode
void setFontSize(double __value)
set the default font size in points

The result looks like this:

jkqtmathtext_simpletest