feat:直方图添加数据实时展示功能

dataPanel/dpBarsChart.cpp

@@ -1,6 +1,103 @@
 #include "dpBarsChart.h"
 #include "dataManager.h"
 
+CustomBars::CustomBars(QCPAxis* keyAxis, QCPAxis* valueAxis)
+    : QCPBars(keyAxis, valueAxis),
+    m_textAlignment(Qt::AlignCenter),
+    m_spacing(5),
+    m_font(QFont(QLatin1String("sans serif"), 12))
+{}
+
+void CustomBars::setTextAlignment(Qt::Alignment alignment)
+{
+    m_textAlignment = alignment;
+}
+
+void CustomBars::setSpacing(double spacing)
+{
+    m_spacing = spacing;
+}
+
+void CustomBars::setFont(QFont font)
+{
+    m_font = font;
+}
+
+void CustomBars::draw(QCPPainter* painter)
+{
+    ///源码拷贝
+    if (!mKeyAxis || !mValueAxis) { qDebug() << Q_FUNC_INFO << "invalid key or value axis"; return; }
+    if (mDataContainer->isEmpty()) return;
+
+    QCPBarsDataContainer::const_iterator visibleBegin, visibleEnd;
+    getVisibleDataBounds(visibleBegin, visibleEnd);
+
+    // loop over and draw segments of unselected/selected data:
+    QList<QCPDataRange> selectedSegments, unselectedSegments, allSegments;
+    getDataSegments(selectedSegments, unselectedSegments);
+    allSegments << unselectedSegments << selectedSegments;
+    for (int i=0; i<allSegments.size(); ++i)
+    {
+        bool isSelectedSegment = i >= unselectedSegments.size();
+        QCPBarsDataContainer::const_iterator begin = visibleBegin;
+        QCPBarsDataContainer::const_iterator end = visibleEnd;
+        mDataContainer->limitIteratorsToDataRange(begin, end, allSegments.at(i));
+        if (begin == end)
+            continue;
+
+        for (QCPBarsDataContainer::const_iterator it=begin; it!=end; ++it)
+        {
+            // check data validity if flag set:
+#ifdef QCUSTOMPLOT_CHECK_DATA
+            if (QCP::isInvalidData(it->key, it->value))
+                qDebug() << Q_FUNC_INFO << "Data point at" << it->key << "of drawn range invalid." << "Plottable name:" << name();
+#endif
+            // draw bar:
+            if (isSelectedSegment && mSelectionDecorator)
+            {
+                mSelectionDecorator->applyBrush(painter);
+                mSelectionDecorator->applyPen(painter);
+            } else
+            {
+                painter->setBrush(mBrush);
+                painter->setPen(mPen);
+            }
+            applyDefaultAntialiasingHint(painter);
+            painter->drawPolygon(getBarRect(it->key, it->value));
+
+            ///---自定义逻辑-start---
+            //draw text
+            QRectF barRect = getBarRect(it->key, it->value);
+            painter->setFont(m_font);
+            QString text = QString::number(it->value, 'g', 2); //获取当前value值，保留两位精度
+            QRectF textRect = painter->fontMetrics().boundingRect(0, 0, 0, 0, Qt::TextDontClip | m_textAlignment, text); //计算文字占用大小
+            if(mKeyAxis.data()->orientation() == Qt::Horizontal) //水平轴为keyAxis
+            {
+                if(mKeyAxis.data()->axisType() == QCPAxis::atTop) //上轴，文字放到柱图下方
+                    textRect.moveTopLeft(barRect.bottomLeft() + QPointF(0, m_spacing));
+                else //下轴，文字放到柱图上方
+                    textRect.moveBottomLeft(barRect.topLeft() - QPointF(0, m_spacing));
+                textRect.setWidth(barRect.width());
+            }
+            else //垂直轴为keyAxis
+            {
+                if(mKeyAxis.data()->axisType() == QCPAxis::atLeft) //左轴，文字放到柱图右侧
+                    textRect.moveTopLeft(barRect.topRight() + QPointF(m_spacing, 0));
+                else //右轴，文字放到柱图左侧
+                    textRect.moveTopRight(barRect.topLeft() - QPointF(m_spacing, 0));
+                textRect.setWidth(barRect.height());
+            }
+            painter->drawText(textRect, Qt::TextDontClip | m_textAlignment, text);
+            ///---自定义逻辑-end---
+        }
+    }
+
+    ///源码拷贝
+    // draw other selection decoration that isn't just line/scatter pens and brushes:
+    if (mSelectionDecorator)
+        mSelectionDecorator->drawDecoration(painter, selection());
+}
+
 dpBarsChart::dpBarsChart(QWidget* parent)
     :dpBaseChart(parent)
 {
@@ -139,7 +236,7 @@ void dpBarsChart::synchronizeConfigData(const configurationResults& cfg)
         bars.dataID = dataID;
         bars.dataType = dataType;
         bars.color = colorData.value<QColor>();
-        QCPBars* qBars = new QCPBars(keyAxis, valueAxis);
+        CustomBars* qBars = new CustomBars(keyAxis, valueAxis);
         qBars->setName(bars.name);
         qBars->setPen(bars.color); //边框颜色
         qBars->setBrush(bars.color); //填充颜色

dataPanel/dpBarsChart.h

@@ -8,12 +8,34 @@
 ** 柱状图展示面板，用来展示统计数据(如各类报警、事件的数量)
 ** 采用QCustomPlot实现
 **
+** CustomBars
+** 自定义Bars，继承自QCPBars，可以展示实时数据等信息
+**
 ******************************************************************************/
 
 #include "dpBaseChart.h"
 
-class QCustomPlot;
-class QCPBarsGroup;
+class CustomBars : public QCPBars
+{
+public:
+    explicit CustomBars(QCPAxis* keyAxis, QCPAxis* valueAxis);
+
+    Qt::Alignment textAlignment() { return m_textAlignment; }
+    double spacing() { return m_spacing; }
+    QFont font() { return m_font; }
+
+    void setTextAlignment(Qt::Alignment);
+    void setSpacing(double);
+    void setFont(QFont);
+
+protected:
+    virtual void draw(QCPPainter* painter) override;
+
+private:
+    Qt::Alignment m_textAlignment; //文字对齐方式
+    double m_spacing; //文字与柱状图之间的间距，单位为像素
+    QFont m_font; //文字的字体
+};
 
 class dpBarsChart : public dpBaseChart
 {
@@ -40,7 +62,7 @@ private:
         QString dataID;
         RealTimeDataType dataType;
         QVector<double> keys;
-        QPointer<QCPBars> qBars;
+        QPointer<CustomBars> qBars;
 
         Bars()
         {

dataPanel/dpLineChart.h

@@ -12,9 +12,6 @@
 
 #include "dpBaseChart.h"
 
-class QCustomPlot;
-class QCPRange;
-
 class dpLineChart : public dpBaseChart
 {
     Q_OBJECT