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采用Qt快速绘制多条曲线（折线），跟随鼠标动态显示线上点的值（基于Qt的开源绘图控件QCu。。。

采⽤Qt快速绘制多条曲线（折线），跟随⿏标动态显⽰线上点的值（基于Qt的开源绘图控件QCu。。。

QCustomPlot是⼀个开源的基于Qt的第三⽅绘图库，能够绘制漂亮的2D图形。

QCustomPlot的官⽅⽹址：

从官⽹下载QCustomPlot的源⽂件，包括qcustomplot.h和qcustomplot.cpp。

本程序的源码下载地址：

1 ⾃定义⿏标显⽰跟随类XxwTracer和XxwTraceLine：

XxwTracer⽤于在图表中显⽰⿏标所在位置的x,y值

XxwTraceLine⽤于在图中显⽰⽔平或垂直的虚线

头⽂件XxwTracer.h

#ifndef MYTRACER_H

#define MYTRACER_H

#include <QObject>

#include "qcustomplot.h"

///

/// \brief The XxwTracer class：在图表中显⽰⿏标所在位置的x,y值的追踪显⽰器

///

class XxwTracer : public QObject

{

Q_OBJECT

光敏三极管public:

enum TracerType

{

智能定位

XAxisTracer,//依附在x轴上显⽰x值

YAxisTracer,//依附在y轴上显⽰y值

DataTracer//在图中显⽰x,y值

};

explicit XxwTracer(QCustomPlot *_plot, TracerType _type, QObject *parent = Q_NULLPTR);

~XxwTracer();

void setPen(const QPen &pen);

void setBrush(const QBrush &brush);

void setText(const QString &text);

void setLabelPen(const QPen &pen);

void updatePosition(double xValue, double yValue);

void setVisible(bool m_visible);

protected:

bool m_visible;//是否可见

TracerType m_type;//类型

QCustomPlot *m_plot;//图表

QCPItemTracer *m_tracer;//跟踪的点

QCPItemText *m_label;//显⽰的数值

QCPItemLine *m_arrow;//箭头

};

///

/// \brief The XxwCrossLine class:⽤于显⽰⿏标移动过程中的⿏标位置的直线

class XxwTraceLine : public QObject

{

public:

enum LineType

{

VerticalLine,//垂直线

HorizonLine, //⽔平线

Both//同时显⽰⽔平和垂直线

};

explicit XxwTraceLine(QCustomPlot *_plot, LineType _type = VerticalLine, QObject *parent = Q_NULLPTR); ~XxwTraceLine();

void initLine();

void updatePosition(double xValue, double yValue);

void setVisible(bool vis)

{

if(m_lineV)

m_lineV->setVisible(vis);

if(m_lineH)

m_lineH->setVisible(vis);

}

protected:

bool m_visible;//是否可见

LineType m_type;//类型

QCustomPlot *m_plot;//图表

QCPItemStraightLine *m_lineV; //垂直线

QCPItemStraightLine *m_lineH; //⽔平线

};

#endif// MYTRACER_H

源⽂件MyTracer.cpp

#include "MyTracer.h"

XxwTracer::XxwTracer(QCustomPlot *_plot, TracerType _type, QObject *parent)

: QObject(parent),

m_plot(_plot),

m_type(_type)

{

m_visible = true;

m_tracer = Q_NULLPTR;// 跟踪的点

m_label = Q_NULLPTR;// 显⽰的数值

m_arrow = Q_NULLPTR;// 箭头

if (m_plot)

{

QColor clrDefault(Qt::red);

QBrush brushDefault(Qt::NoBrush);

QPen penDefault(clrDefault);

// penDefault.setBrush(brushDefault);

penDefault.setWidthF(0.5);

m_tracer = new QCPItemTracer(m_plot);

m_tracer->setStyle(QCPItemTracer::tsCircle);

m_tracer->setPen(penDefault);

m_tracer->setBrush(brushDefault);

m_label = new QCPItemText(m_plot);

m_label->setLayer("overlay");

m_label->setClipToAxisRect(false);

m_label->setPadding(QMargins(5, 5, 5, 5));

m_label->setBrush(brushDefault);

m_label->setPen(penDefault);

m_label->position->setParentAnchor(m_tracer->position);

// m_label->setFont(QFont("宋体", 8));

m_label->setFont(QFont("Arial", 8));

m_label->setColor(clrDefault);

m_label->setText("");

m_arrow = new QCPItemLine(m_plot);

QPen arrowPen(clrDefault, 1);

m_arrow->setPen(penDefault);

m_arrow->setLayer("overlay");

m_arrow->setClipToAxisRect(false);

m_arrow->setHead(QCPLineEnding::esSpikeArrow);//设置头部为箭头形状

switch (m_type)

{

case XAxisTracer:

{

m_tracer->position->setTypeX(QCPItemPosition::ptPlotCoords);

m_tracer->position->setTypeY(QCPItemPosition::ptAxisRectRatio);

m_tracer->setSize(7);

m_label->setPositionAlignment(Qt::AlignTop | Qt::AlignHCenter);

m_arrow->end->setParentAnchor(m_tracer->position);

m_arrow->start->setParentAnchor(m_arrow->end);

m_arrow->start->setCoords(0, 20);//偏移量

break;

}

case YAxisTracer:

{

m_tracer->position->setTypeX(QCPItemPosition::ptAxisRectRatio);

m_tracer->position->setTypeY(QCPItemPosition::ptPlotCoords);

m_tracer->setSize(7);

m_label->setPositionAlignment(Qt::AlignRight | Qt::AlignHCenter);

m_arrow->end->setParentAnchor(m_tracer->position);

m_arrow->start->setParentAnchor(m_label->position);

m_arrow->start->setCoords(-20, 0);//偏移量

break;

}

case DataTracer:

{

m_tracer->position->setTypeX(QCPItemPosition::ptPlotCoords);

m_tracer->position->setTypeY(QCPItemPosition::ptPlotCoords);

m_tracer->setSize(5);

m_label->setPositionAlignment(Qt::AlignLeft | Qt::AlignVCenter);

m_arrow->end->setParentAnchor(m_tracer->position);

m_arrow->start->setParentAnchor(m_arrow->end);

m_arrow->start->setCoords(20, 0);

break;

}

default:

break;

}

setVisible(false);

}

XxwTracer::~XxwTracer()

{

if(m_plot)

{

if (m_tracer)

m_plot->removeItem(m_tracer);

if (m_label)

m_plot->removeItem(m_label);

if (m_arrow)

m_plot->removeItem(m_arrow);

}

void XxwTracer::setPen(const QPen &pen)

{

if(m_tracer)

m_tracer->setPen(pen);

if(m_arrow)

m_arrow->setPen(pen);

}

void XxwTracer::setBrush(const QBrush &brush)

{

if(m_tracer)

m_tracer->setBrush(brush);

}

void XxwTracer::setLabelPen(const QPen &pen)

{

if(m_label)

{

m_label->setPen(pen);

m_label->setBrush(Qt::NoBrush);

m_label->lor());

}

void XxwTracer::setText(const QString &text)

{

if(m_label)

m_label->setText(text);

}

void XxwTracer::setVisible(bool vis)

{

m_visible = vis;

if(m_tracer)

涡轮抽风机

m_tracer->setVisible(m_visible);

if(m_label)

m_label->setVisible(m_visible);

if(m_arrow)

m_arrow->setVisible(m_visible);

}

void XxwTracer::updatePosition(double xValue, double yValue) {

if (!m_visible)

{

setVisible(true);

m_visible = true;

}

if (yValue > m_plot->yAxis->range().upper)

yValue = m_plot->yAxis->range().upper;

switch (m_type)

{

case XAxisTracer:

{

m_tracer->position->setCoords(xValue, 1);

m_label->position->setCoords(0, 15);

m_arrow->start->setCoords(0, 15);

m_arrow->end->setCoords(0, 0);

setText(QString::number(xValue));

break;

}

case YAxisTracer:

{

m_tracer->position->setCoords(0, yValue);

m_label->position->setCoords(-20, 0);

// m_arrow->start->setCoords(20, 0);

// m_arrow->end->setCoords(0, 0);

setText(QString::number(yValue));

break;

}

case DataTracer:

{

m_tracer->position->setCoords(xValue, yValue);

m_label->position->setCoords(20, 0);

setText(QString("x:%1,y:%2").arg(xValue).arg(yValue));

break;

}

舵角指示器default:

break;

}

XxwTraceLine::XxwTraceLine(QCustomPlot *_plot, LineType _type, QObject *parent) : QObject(parent),

m_type(_type),

m_plot(_plot)

{

m_lineV = Q_NULLPTR;

m_lineH = Q_NULLPTR;

initLine();发电机集电环

}

XxwTraceLine::~XxwTraceLine()

{

if(m_plot)

{

if (m_lineV)

m_plot->removeItem(m_lineV);

if (m_lineH)

m_plot->removeItem(m_lineH);

}

void XxwTraceLine::initLine()

{

if(m_plot)

{

QPen linesPen(Qt::red, 1, Qt::DashLine);

if(VerticalLine == m_type || Both == m_type)

{

m_lineV = new QCPItemStraightLine(m_plot);//垂直线

m_lineV->setLayer("overlay");

m_lineV->setPen(linesPen);

m_lineV->setClipToAxisRect(true);

m_lineV->point1->setCoords(0, 0);

m_lineV->point2->setCoords(0, 0);

}

if(HorizonLine == m_type || Both == m_type)

{

m_lineH = new QCPItemStraightLine(m_plot);//⽔平线

m_lineH->setLayer("overlay");

m_lineH->setPen(linesPen);

m_lineH->setClipToAxisRect(true);

锂电池注液机

m_lineH->point1->setCoords(0, 0);

m_lineH->point2->setCoords(0, 0);

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