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