mirror of
https://github.com/jkriege2/JKQtPlotter.git
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97 lines
3.6 KiB
C++
97 lines
3.6 KiB
C++
/** \example paramscatterplot_image.cpp
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* JKQTPlotter: Examples: Draw an Artistic Image with a Parametrized Scatter Graph
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*
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* \ref JKQTPlotterParamScatterImage
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*/
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#include "jkqtpexampleapplication.h"
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#include <QApplication>
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#include "jkqtplotter/jkqtplotter.h"
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#include "jkqtplotter/graphs/jkqtpscatter.h"
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#include "jkqtplotter/graphs/jkqtpimage.h"
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int main(int argc, char* argv[])
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{
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JKQTPAppSettingController highDPIController(argc, argv);
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JKQTPExampleApplication app(argc, argv);
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// 1. create a plotter window and get a pointer to the internal datastore (for convenience)
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JKQTPlotter plot;
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JKQTPDatastore* ds=plot.getDatastore();
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// 2. Prepare Data
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// 2.1 load image
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QImage image(":/example.bmp");
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QVector<double> imageVector, pointSizes;
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QVector<double> X,Y;
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// 2.2 convert image to greyscale, stored in a vector in row-major order
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double maxSymbolSize=30; // maximal diameter of symbols in pt
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for (int y=0; y<image.height(); y++) {
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for (int x=0; x<image.width(); x++) {
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// calculate grey-value image vector
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imageVector.push_back(qGray(image.pixel(x,y)));
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// calculate point sizes from inverse grey value and scaling between 0 and maxSymbolSize
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pointSizes.push_back(static_cast<double>(255-qGray(image.pixel(x,y)))/255.0*maxSymbolSize);
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// calculate X/Y-coordinates (y mirrored, so image is upright)
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X.push_back(x);
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Y.push_back(image.height()-1-y);
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}
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}
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// 2.3 and copy it to the datastore
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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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size_t columnG=ds->addCopiedColumn(imageVector, "greyscaleImageData");
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size_t columnS=ds->addCopiedColumn(pointSizes, "pointSizes");
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// 3. add graphs to plot
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// 3.1 Now add a parametrized scatter graph with columnX, columnY for the positions of the
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// scatter points, where the symbol size is given by column columnS and the color of
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// each symbol is set from column columnG, via a color palette JKQTPMathImageMATLAB
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JKQTPXYParametrizedScatterGraph* graph1=new JKQTPXYParametrizedScatterGraph(&plot);
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graph1->setXColumn(columnX);
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graph1->setYColumn(columnY);
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graph1->setSizeColumn(columnS);
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graph1->setSymbolColumn(columnS);
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graph1->setSymbolType(JKQTPFilledTriangle);
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graph1->setColorColumn(columnG);
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graph1->setColorPalette(JKQTPMathImageOCEAN);
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graph1->setDrawLine(false);
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graph1->setTitle("");
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plot.addGraph(graph1);
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// 3.2 add an image to display the original graphics
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JKQTPImage* graph2=new JKQTPImage(&plot);
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graph2->setImage(image);
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graph2->setX(0);
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graph2->setY(0);
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graph2->setWidth(10);
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graph2->setHeight(10);
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plot.addGraph(graph2);
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// 4. scale the plot so the graph is contained and format the coordinate system
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plot.getXAxis()->setAxisLabel("x-axis");
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plot.getYAxis()->setAxisLabel("y-axis");
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plot.getXAxis()->setDrawGrid(false);
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plot.getYAxis()->setDrawGrid(false);
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// max. size is the size of the image
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plot.setXY(0,image.width()-1,0,image.height()-1);
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plot.setAbsoluteXY(0,image.width()-1,0,image.height()-1);
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// ensure that axis aspect ratio and coordinate system aspect ratio are maintained
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plot.getPlotter()->setMaintainAspectRatio(true);
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plot.getPlotter()->setAspectRatio(1);
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plot.getPlotter()->setMaintainAxisAspectRatio(true);
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plot.getPlotter()->setAxisAspectRatio(1);
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// 5. show plotter and make it a decent size
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plot.show();
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plot.resize(800,800);
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return app.exec();
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}
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