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54 lines
1.8 KiB
Markdown
54 lines
1.8 KiB
Markdown
# Example (JKQtPlotter): Simple impulse plots {#JKQtPlotterImpulsePlots}
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This project (see `./examples/simpletest_impulsesplot/`) simply creates a JKQtPlotter widget (as a new window) and adds a single impulse graph.
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The soruce code of the main application is (see [`jkqtplotter_simpletest_impulsesplot.cpp`](../simpletest_impulsesplot/jkqtplotter_simpletest_impulsesplot.cpp).
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First data for a curve is calculated and stored in `QVector<double>`:
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```.cpp
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QVector<double> X, Y;
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for (int i=0; i<Ndata; i++) {
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const double xx=double(i)/double(Ndata)*6.0*M_PI;
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X << xx;
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Y << cos(xx)*exp(-xx/10.0);
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}
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```
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... and finally the data is copied into the datastore
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```.cpp
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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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```
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Now an impulse graph object is generated and added to the plot:
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```.cpp
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JKQTPimpulsesVerticalGraph* graph=new JKQTPimpulsesVerticalGraph(&plot);
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graph->set_xColumn(columnX);
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graph->set_yColumn(columnY);
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graph->set_lineWidth(2);
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graph->set_color(QColor("red"));
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graph->set_title(QObject::tr("$\\cos(x)\\cdot\\exp(-x/10)$"));
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plot.addGraph(graph);
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```
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The result looks like this:
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There is an alternative class `JKQTPimpulsesHorizontalGraph` which draws horizontal impulse plots:
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```.cpp
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JKQTPimpulsesHorizontalGraph* graph=new JKQTPimpulsesHorizontalGraph(&plot);
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graph->set_yColumn(columnX);
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graph->set_xColumn(columnY);
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graph->set_lineWidth(2);
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graph->set_color(QColor("blue"));
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graph->set_title(QObject::tr("$\\cos(x)\\cdot\\exp(-x/10)$"));
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```
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This code snippet results in a plot like this:
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