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101 lines
3.4 KiB
Markdown
101 lines
3.4 KiB
Markdown
# Example (JKQTPlotter): Very simple line-graph {#JKQTPlotterSimpleTest}
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This project (see `./examples/simpletest/`) simply creates a JKQTPlotter widget (as a new window) and adds a single line-graph (a sine-wave). Data is initialized from two QVector<double> objects.
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The QMake project looks like this (see [`jkqtplotter_simpletest.pro`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/simpletest/jkqtplotter_simpletest.pro):
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```.qmake
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# source code for this simple demo
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SOURCES = jkqtplotter_simpletest.cpp
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# configure Qt
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CONFIG += qt
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QT += core gui xml svg
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
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# output executable name
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TARGET = jkqtplotter_simpletest
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# include JKQTPlotter source headers and link against library
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DEPENDPATH += ../../lib ../../qmake/staticlib/jkqtplotterlib
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INCLUDEPATH += ../../lib
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CONFIG (debug, debug|release) {
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LIBS += -L../../qmake/staticlib/jkqtplotterlib/debug -ljkqtplotterlib_debug
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} else {
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LIBS += -L../../qmake/staticlib/jkqtplotterlib/release -ljkqtplotterlib
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}
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```
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Alternatively to linking agains a `libjkqtplotter`, you can also directy add the JKQTPlotter sources to the project:
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```.qmake
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# source code for this simple demo
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SOURCES = jkqtplotter_simpletest.cpp
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# configure Qt
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CONFIG += qt
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QT += core gui svg
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greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport
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# output executable name
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TARGET = jkqtplotter_simpletest
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# include JKQTPlotter source code
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include(../../lib/jkqtplotter.pri)
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```
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The source code of the main application is (see [`jkqtplotter_simpletest.cpp`](https://github.com/jkriege2/JKQtPlotter/tree/master/examples/simpletest/jkqtplotter_simpletest.cpp):
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```.cpp
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#include <QApplication>
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#include "jkqtplotter/jkqtplotter.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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// 1. create a plotter window and get a pointer to the internal datastore
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// (for convenience)
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JKQTPlotter plot;
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JKQTPDatastore* ds=plot.getDatastore();
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// 2. now we create data for a simple plot (a sine curve)
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QVector<double> X, Y;
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const int Ndata=100;
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for (int i=0; i<Ndata; i++) {
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const double x=double(i)/double(Ndata)*8.0*M_PI;
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X<<x;
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Y<<sin(x);
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}
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// 3. make data available to JKQTPlotter by adding it to the internal
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// datastore.
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// Note: In this step the data is copied (of not specified otherwise), so
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// you can reuse X and Y afterwards!
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// The variables columnX and columnY will contain the internal column ID
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// of the newlycreated columns with names "x" and "y" and the (copied)
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// data from X and Y.
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size_t columnX=ds->addCopiedColumn(X, "x");
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size_t columnY=ds->addCopiedColumn(Y, "y");
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// 4. create a graph in the plot, which plots the dataset X/Y:
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JKQTPXYLineGraph* graph1=new JKQTPXYLineGraph(&plot);
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graph1->setXColumn(columnX);
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graph1->setYColumn(columnY);
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graph1->setTitle(QObject::tr("sine graph"));
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// 5. add the graph to the plot, so it is actually displayed
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plot.addGraph(graph1);
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// 6. autoscale the plot so the graph is contained
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plot.zoomToFit();
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// show plotter and make it a decent size
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plot.show();
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plot.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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