新增超级曲线图表

third/qcustomplotdemo/frmexample/frmsimpleitem.cpp

@@ -0,0 +1,34 @@
+#include "frmsimpleitem.h"
+#include "ui_frmsimpleitem.h"
+#include "qdebug.h"
+
+frmSimpleItem::frmSimpleItem(QWidget *parent) : QWidget(parent), ui(new Ui::frmSimpleItem)
+{
+    ui->setupUi(this);
+    this->initForm();
+}
+
+frmSimpleItem::~frmSimpleItem()
+{
+    delete ui;
+}
+
+void frmSimpleItem::initForm()
+{
+    ui->customPlot->setInteractions(QCP::iRangeDrag | QCP::iRangeZoom);
+
+    // add the text label at the top:
+    QCPItemText *textLabel = new QCPItemText(ui->customPlot);
+    textLabel->setPositionAlignment(Qt::AlignTop|Qt::AlignHCenter);
+    textLabel->position->setType(QCPItemPosition::ptAxisRectRatio);
+    textLabel->position->setCoords(0.5, 0); // place position at center/top of axis rect
+    textLabel->setText("Text Item Demo");
+    textLabel->setFont(QFont(font().family(), 16)); // make font a bit larger
+    textLabel->setPen(QPen(Qt::black)); // show black border around text
+
+    // add the arrow:
+    QCPItemLine *arrow = new QCPItemLine(ui->customPlot);
+    arrow->start->setParentAnchor(textLabel->bottom);
+    arrow->end->setCoords(4, 1.6); // point to (4, 1.6) in x-y-plot coordinates
+    arrow->setHead(QCPLineEnding::esSpikeArrow);
+}