35 lines
996 B
C++
35 lines
996 B
C++
|
#include "frmquadratic.h"
|
|||
|
|
#include "ui_frmquadratic.h"
|
|||
|
|
#include "qdebug.h"
|
|||
|
|
|
|||
|
|
frmQuadratic::frmQuadratic(QWidget *parent) : QWidget(parent), ui(new Ui::frmQuadratic)
|
|||
|
|
{
|
|||
|
|
ui->setupUi(this);
|
|||
|
|
this->initForm();
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
frmQuadratic::~frmQuadratic()
|
|||
|
|
{
|
|||
|
|
delete ui;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
void frmQuadratic::initForm()
|
|||
|
|
{
|
|||
|
|
// generate some data:
|
|||
|
|
QVector<double> x(101), y(101); // initialize with entries 0..100
|
|||
|
|
for (int i = 0; i < 101; ++i) {
|
|||
|
|
x[i] = i / 50.0 - 1; // x goes from -1 to 1
|
|||
|
|
y[i] = x[i] * x[i]; // let's plot a quadratic function
|
|||
|
|
}
|
|||
|
|
// create graph and assign data to it:
|
|||
|
|
ui->customPlot->addGraph();
|
|||
|
|
ui->customPlot->graph(0)->setData(x, y);
|
|||
|
|
// give the axes some labels:
|
|||
|
|
ui->customPlot->xAxis->setLabel("x");
|
|||
|
|
ui->customPlot->yAxis->setLabel("y");
|
|||
|
|
// set axes ranges, so we see all data:
|
|||
|
|
ui->customPlot->xAxis->setRange(-1, 1);
|
|||
|
|
ui->customPlot->yAxis->setRange(0, 1);
|
|||
|
|
ui->customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
|
|||
|
|
}
|