JKQtPlotter/test/simpletest_impulsesplot/README.md

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Simple impulse plots

This project (see ./test/simpletest_impulsesplot/) simply creates a JKQtPlotter widget (as a new window) and adds a single impulse graph. The soruce code of the main application is (see jkqtplotter_simpletest_impulsesplot.cpp.

First data for a curve is calculated and stored in QVector<double:

    QVector<double> X, Y;
    for (int i=0; i<Ndata; i++) {
        const double xx=double(i)/double(Ndata)*6.0*M_PI;
        X << xx;
        Y << cos(xx)*exp(-xx/10.0);
    }

... and finally the data is copied into the datastore

    size_t columnX=ds->addCopiedColumn(X,  "x");
    size_t columnY=ds->addCopiedColumn(Y,  "y");

Now an impulse graph object is generated and added to the plot:

    JKQTPimpulsesVerticalGraph* graph=new JKQTPimpulsesVerticalGraph(&plot);
    graph->set_xColumn(columnX);
    graph->set_yColumn(columnY);
	graph->set_lineWidth(2);
	graph->set_color(QColor("red"));
    graph->set_title(QObject::tr("$\\cos(x)\\cdot\\exp(-x/10)$"));

    plot.addGraph(graph);

The result looks like this:

There is an alternative class JKQTPimpulsesHorizontalGraph which draws horizontal impulse plots:

    JKQTPimpulsesHorizontalGraph* graph=new JKQTPimpulsesHorizontalGraph(&plot);
    graph->set_yColumn(columnX);
    graph->set_xColumn(columnY);
    graph->set_lineWidth(2);
    graph->set_color(QColor("blue"));
    graph->set_title(QObject::tr("$\\cos(x)\\cdot\\exp(-x/10)$"));

This code snippet results in a plot like this:

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