mirror of
https://github.com/jkriege2/JKQtPlotter.git
synced 2024-11-16 02:25:50 +08:00
2d08250db6
- fixed additional renames JKQTPLotter->JKQTPlotter - improved documentation (boxplots, JKQTMathText) - added several examples
105 lines
3.8 KiB
C++
105 lines
3.8 KiB
C++
/** \example jkqtplotter_simpletest_filledgraphs.cpp
|
|
* Shows how to use filled graphs with JKQTPlotter
|
|
*
|
|
* \ref JKQTPlotterFilledGraphs
|
|
*/
|
|
|
|
#include <QApplication>
|
|
#include "jkqtplotter/jkqtplotter.h"
|
|
#include "jkqtplotter/jkqtpgraphsfilledcurve.h"
|
|
|
|
int main(int argc, char* argv[])
|
|
{
|
|
QApplication app(argc, argv);
|
|
|
|
// 1. create a plotter window and get a pointer to the internal datastore (for convenience)
|
|
JKQTPlotter plot;
|
|
JKQTPDatastore* ds=plot.getDatastore();
|
|
|
|
// 2. now we create 4 datacolumns with length 256 entries in the datastore
|
|
// these will later hold the RGB-histogram and a linear x-values vector
|
|
// - the x-values are directly initialized as linear vector 0..255 in 256 steps
|
|
// - the other columns are generated and size_t-type indexes are stored for later
|
|
// reference to these columns in the graphs-
|
|
size_t columnX=ds->addLinearColumn(256, 0, 255, "x");
|
|
size_t columnR=ds->addColumn(256, "historam_R");
|
|
size_t columnG=ds->addColumn(256, "historam_G");
|
|
size_t columnB=ds->addColumn(256, "historam_B");
|
|
// - in addition JKQTPColumn objects are generated, which can be used to access
|
|
// the data in the columns
|
|
JKQTPColumn cG=ds->getColumn(columnG);
|
|
JKQTPColumn cR=ds->getColumn(columnR);
|
|
JKQTPColumn cB=ds->getColumn(columnB);
|
|
// - now all columns for RGB are initialized to 0
|
|
cR.setAll(0);
|
|
cG.setAll(0);
|
|
cB.setAll(0);
|
|
|
|
// 3. now we open a BMP-file and load it into a QImage
|
|
QImage image(":/example.bmp");
|
|
// ... and calculate the RGB-histograms
|
|
for (int y=0; y<image.height(); y++) {
|
|
for (int x=0; x<image.width(); x++) {
|
|
QRgb pix=image.pixel(x,y);
|
|
cR.incValue(qRed(pix), 1);
|
|
cG.incValue(qGreen(pix), 1);
|
|
cB.incValue(qBlue(pix), 1);
|
|
}
|
|
}
|
|
// ... and normalize histograms
|
|
cR.scale(100.0/static_cast<double>(image.width()*image.height()));
|
|
cG.scale(100.0/static_cast<double>(image.width()*image.height()));
|
|
cB.scale(100.0/static_cast<double>(image.width()*image.height()));
|
|
|
|
|
|
// 4. now we add three semi-transparent, filled curve plots, one for each histogram
|
|
JKQTPFilledCurveXGraph* graphR=new JKQTPFilledCurveXGraph(&plot);
|
|
JKQTPFilledCurveXGraph* graphG=new JKQTPFilledCurveXGraph(&plot);
|
|
JKQTPFilledCurveXGraph* graphB=new JKQTPFilledCurveXGraph(&plot);
|
|
|
|
// set graph titles
|
|
graphR->set_title("R-channel");
|
|
graphG->set_title("G-channel");
|
|
graphB->set_title("B-channel");
|
|
|
|
// set graph colors (lines: non-transparent, fill: semi-transparent) and style
|
|
QColor col;
|
|
col=QColor("red"); graphR->set_color(col);
|
|
col.setAlphaF(0.25); graphR->set_fillColor(col);
|
|
col=QColor("green"); graphG->set_color(col);
|
|
col.setAlphaF(0.25); graphG->set_fillColor(col);
|
|
col=QColor("blue"); graphB->set_color(col);
|
|
col.setAlphaF(0.25); graphB->set_fillColor(col);
|
|
graphR->set_lineWidth(1);
|
|
graphG->set_lineWidth(1);
|
|
graphB->set_lineWidth(1);
|
|
|
|
// set data
|
|
graphR->set_xColumn(columnX); graphR->set_yColumn(columnR);
|
|
graphG->set_xColumn(columnX); graphG->set_yColumn(columnG);
|
|
graphB->set_xColumn(columnX); graphB->set_yColumn(columnB);
|
|
|
|
|
|
// add the graphs to the plot, so they are actually displayed
|
|
plot.addGraph(graphB);
|
|
plot.addGraph(graphG);
|
|
plot.addGraph(graphR);
|
|
|
|
// 5. set axis labels
|
|
plot.get_xAxis()->set_axisLabel("R/G/B-value");
|
|
plot.get_yAxis()->set_axisLabel("normalized frequency [%]");
|
|
|
|
|
|
// 4. set the maximum size of the plot to 0..100% and 0..256
|
|
plot.setAbsoluteX(0,256);
|
|
plot.setAbsoluteY(0,100);
|
|
// ... and scale plot automatically
|
|
plot.zoomToFit();
|
|
|
|
// 5. show plotter and make it a decent size
|
|
plot.show();
|
|
plot.resize(600,400);
|
|
|
|
return app.exec();
|
|
}
|