新增超级曲线图表

third/qcustomplotdemo/frmexample/frmquadratic.cpp

@@ -0,0 +1,34 @@
+#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);
+}