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74 lines
3.4 KiB
Markdown
74 lines
3.4 KiB
Markdown
# Example (JKQTPLotter): Plotting Geometric Objects {#JKQTPLotterGeometricGraphs}
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This project (see `./test/simpletest_geometric/`) shows the capabilities of JKQTPLotter to also draw geometric elements, like circles, ellipses, rectangles etc.
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The source code of the main application can be found in [`jkqtplotter_simpletest_geometric.cpp`](../simpletest_geometric/jkqtplotter_simpletest_geometric.cpp). First a plot is generated and the axis aspect ration is set to 1, so an accurate plot is generated. Then several geometric graphs are added to the plot. Here are some examples, you can find more more examples in the source code of the example:
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```.cpp
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// a text element
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plot.addGraph(new JKQTPGeoText(&plot, 0.1,0.6, "$x_{1/2}=\\frac{\\sqrt{b^2-4ac}}{2a}$", 10, QColor("red")));
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// a single symbol
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plot.addGraph(new JKQTPGeoSymbol(&plot, 0.1,0.6, JKQTPCircle, 5, QColor("grey")));
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// a line
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plot.addGraph(new JKQTPGeoLine(&plot, 1, 0.05, 1.9, 0.9, QColor("red"), 2));
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// a one-sided infinite line with slope dy/dx=0.25/0.2
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JKQTPGeoInfiniteLine* infLine=new JKQTPGeoInfiniteLine(&plot, 1.7, 0.2, 0.2, 0.25, QColor("green"), 1.5, Qt::PenStyle::DashLine);
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infLine->set_two_sided(false);
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infLine->setAlpha(0.5);
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plot.addGraph(infLine);
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// a polyline
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QVector<QPointF> p;
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p<<QPointF(1, 0.1)<<QPointF(1.3, 0.9)<<QPointF(1.6, 0.3)<<QPointF(1.9, 0.8);
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plot.addGraph(new JKQTPGeoPolyLines(&plot, p, QColor("darkgreen"), 4, Qt::PenStyle::DashDotLine));
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// rectangle:
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plot.addGraph(new JKQTPGeoRectangle(&plot, QPointF(0.4,1.3), QPointF(0.9,1.6), QColor("blue"), 1, Qt::SolidLine, rfill));
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// a rotated rectangle (rotated by 35 degrees):
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plot.addGraph(new JKQTPGeoRectangle(&plot, 0.5,1.5,0.8,0.5, 35, QColor("darkblue"), 2, Qt::DashLine));
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// ellipse:
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plot.addGraph(new JKQTPGeoEllipse(&plot, QPointF(0.4,1.3), QPointF(0.9,1.6), QColor("blue"), 1, Qt::SolidLine, rfill));
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// a rotated ellipse (rotated by 35 degrees):
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plot.addGraph(new JKQTPGeoEllipse(&plot, 0.5,1.5,0.8,0.5, 35, QColor("darkblue"), 2, Qt::DashLine));
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// a polygon
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JKQTPGeoPolygon* polygraph=new JKQTPGeoPolygon(&plot, QColor("red"), 2, Qt::PenStyle::DashLine, QColor("salmon"));
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polygraph->appendPoint(2.1, 0.5);
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polygraph->appendPoint(2.9, 0.9);
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polygraph->appendPoint(2.2, 0.8);
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polygraph->appendPoint(2.8, 0.25);
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polygraph->appendPoint(2.6, 0.6);
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polygraph->setAlpha(0.75);
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plot.addGraph(polygraph);
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// an arc from an ellipse from -10 degrees to 117 degrees, centered at 2.5,1.5 and full axes of 0.5 and 0.5
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plot.addGraph(new JKQTPGeoArc(&plot,2.5,1.5,0.5,0.5, -10, 117 , QColor("orange"), 4, Qt::PenStyle::DashLine));
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// a pie centered at 2.5,2.5 with ellipse axes 0.9 and 0.9 and from angle 0 degrees to 90 degrees
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plot.addGraph(new JKQTPGeoPie(&plot,2.5,2.5,0.9,0.9, 0, 90 , QColor("blue"), 4, Qt::PenStyle::SolidLine,QColor("lightblue")));
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// a chord centered at 2.5,2.5 with ellipse axes 0.9 and 0.9 and from angle 0 degrees to 90 degrees
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plot.addGraph(new JKQTPGeoChord(&plot,2.5,2.5,0.9,0.9, 0, 90 , QColor("blue"), 4, Qt::PenStyle::SolidLine,QColor("lightblue")));
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```
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The result of the example combines all these elements and looks like this:
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