mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-15 18:15:52 +08:00
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/** \example rgbimageplot_qt.cpp
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* JKQTPlotter: Examples: `QImage` as a Graph
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*
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* \ref JKQTPlotterImagePlotQImageRGB
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*/
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#include <QApplication>
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#include <cmath>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/graphs/jkqtpscatter.h"
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#include "jkqtplotter/graphs/jkqtpimagergb.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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JKQTPlotter plot;
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// 1. create a plotter window and get a pointer to the internal datastore (for convenience)
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plot.getPlotter()->setUseAntiAliasingForGraphs(true); // nicer (but slower) plotting
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plot.getPlotter()->setUseAntiAliasingForSystem(true); // nicer (but slower) plotting
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plot.getPlotter()->setUseAntiAliasingForText(true); // nicer (but slower) text rendering
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// 2. now we open a BMP-file and load it into an OpenCV cv::Mat
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QImage image(":/example.bmp");
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// 3. create a graph (JKQTPImage) with a pointer to the QImage-object, generated above
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JKQTPImage* graph=new JKQTPImage(&plot);
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graph->setTitle("");
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// copy the image into the graph (optionally you could also give a pointer to a QImage,
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// but then you need to ensure that the QImage is available as long as the JKQTPImage
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// instace lives)
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graph->setImage(image);
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// where does the image start in the plot, given in plot-axis-coordinates (bottom-left corner)
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graph->setX(0);
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graph->setY(0);
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// width/height of the image in plot coordinates
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graph->setWidth(image.width());
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graph->setHeight(image.height());
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// 4. add the graphs to the plot, so it is actually displayed
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plot.addGraph(graph);
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// 5. set axis labels
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plot.getXAxis()->setAxisLabel("x [pixels]");
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plot.getYAxis()->setAxisLabel("y [pixels]");
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// 5.1 invert y-axis, so image is oriented correctly
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plot.getYAxis()->setInverted(true);
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// 6. fix axis aspect ratio to width/height, so pixels are square
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plot.getPlotter()->setMaintainAspectRatio(true);
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plot.getPlotter()->setAspectRatio(double(image.width())/double(image.height()));
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// 7. autoscale the plot so the graph is contained
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plot.zoomToFit();
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// 8. show plotter and make it a decent size
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plot.show();
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plot.resize(800,600);
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plot.setWindowTitle("JKQTPImage");
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return app.exec();
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}
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