Qt自定义Plot实现曲线绘制的详细过程

简介

实现了qt绘制曲线功能，包含arm触摸屏多点触控缩放（只支持两点），实时曲线绘制，数据点根据绘制宽度优化，跟踪点数据获取，双坐标等功能

演示

代码

头文件 plot.h

/*
* 作者:老人与海
* 博客:https://blog.csdn.net/qq_41340733
* 代码不保证稳定性，请勿用于商业用途
*/

#ifndef PLOT_H
#define PLOT_H

#include <QWidget>
#include <QTimer>
#include <QList>
#include <QWheelEvent>
#include <QMouseEvent>
#include "plotdata.h"
typedef struct _RangeVal
{
  double Beg;
  double End;
  double offSet;
  bool IsOffSet;
  _RangeVal()
  {
      Beg=0;
      End=0;
      offSet=0;
      IsOffSet=false;
  }
}_RangeVal;

//鼠标跟中点
class Tracking
{
public:
  Tracking()
  {
      m_IsDraw=false;
      m_IsMove=false;
      m_IsInit=false;
      m_First=false;
      m_radius=25;
      m_PointCenter=QPoint(0,0);
  }
  ~Tracking(){}
  bool getIsRange(QPoint point)
  {
      if(point.x()>(m_PointCenter.x()-m_radius)&&
              point.x()<(m_PointCenter.x()+m_radius)&&
              point.y()>(m_PointCenter.y()-m_radius)&&
              point.y()<(m_PointCenter.y()+m_radius))
      {
          return true;
      }else{
          return false;
      }
  }
public:
  bool m_IsDraw;
  bool m_IsMove;//鼠标焦点
  bool m_IsInit;
  bool m_First;
  int m_radius;
  QPoint m_PointCenter;//绘制圆心
};

/**
* @brief The CoorAxis class
* 类名：CoorAxis
* 功能：坐标轴部件，用来绘制XY坐标轴，使用时必须用Plot的ticker类进行初始化，否则无法正常绘制坐标
*/
class CoorAxis : public QWidget
{
  Q_OBJECT
public:
  explicit CoorAxis(QWidget *parent = nullptr,Ticker *ticker= nullptr);
  virtual ~CoorAxis();

  Ticker *ticker(){ return m_Ticker; }
  void mouseMove(QMouseEvent *event);
signals:
  void sig_UpdateUI();
public slots:
  void slots_sendCoorWheel(QWheelEvent *event);
  void slots_sendCoorMouse(QMouseEvent *event,QPoint point,bool IsFirst=false);
protected:
 void paintEvent(QPaintEvent *event);
 void drawTickerX(QPainter *painter);//绘制X轴
 void drawTickerY_L(QPainter *painter);//绘制左边Y轴
 void drawTickerY_R(QPainter *painter);//绘制右边Y轴
 void wheelEvent(QWheelEvent *event);//滚轮事件，缩放曲线图像
 void mousePressEvent(QMouseEvent *event);//按下事件，记录坐标和按下标志
 void mouseReleaseEvent(QMouseEvent *event);//抬起事件，取消按下标志
 void mouseMoveEvent(QMouseEvent *event);//鼠标移动事件，移动曲线

protected:
 Ticker *m_Ticker;
 int m_LastLength;
 int m_margin;

 bool IsPress=false;
 QPoint m_FirstPoint;
};


class Plot : public QWidget
{
  Q_OBJECT
public:
  explicit Plot(QWidget *parent=nullptr);
  virtual ~Plot();

  void ValueInit();
  Ticker *tickerX();
  Ticker *tickerL();
  Ticker *tickerR();
  void addGraph();
  void GraphClear(){ m_XyGraph.clear(); }
  int getGraphCount(){ return m_XyGraph.count(); }
  _XYList *Graph(int index);
  QList<_XYList> &GraphGroup(){ return m_XyGraph; }
  void setTrackVisibel(bool isVisbel){ m_Tracking.m_IsDraw=isVisbel; }
  bool getTrackVisibel(){ return m_Tracking.m_IsDraw; }
  void setIsDrawPath(bool value){ m_IsDrawPath=value; }
  bool getIsDrawPath(){ return m_IsDrawPath; }

  void coordToPixel(_COORDINATEVALUE *Value,_TICKERTYPE Type);
  void coordToPixel(double &key,double &value,_TICKERTYPE Type);
  void PixelToCoorKey(double &key,_TICKERTYPE Type);
  void PixelToCoorValue(double &value,_TICKERTYPE Type);
  void PixelToCoord(QPointF &pointf,_TICKERTYPE Type);
  void getOptimizedLineData(QVector<QPointF> *lineData,int index);

  void calculateTrackValue(QPoint Point);
  void setBackgroundColor(QColor color){ m_BackgroundColor=color; }
  QColor getBackgroundColor(){ return m_BackgroundColor; }
signals:
  void sig_sendCoorWheel(QWheelEvent *event);
  void sig_sendCoorMouse(QMouseEvent *event,QPoint point,bool IsFirst=false);
  void sig_UpdateUI();
  void sig_UpdateTrack();//刷新跟踪点数据
public slots:

protected:
 void paintEvent(QPaintEvent *event);
 void drawGrid(QPainter *painter);//绘制网格
 void drawPath(QPainter *painter);//绘制曲线
 void drawCursor(QPainter *painter);//绘制跟踪点
 void drawTickerX(QPainter *painter);//绘制X轴
 void drawTickerY_L(QPainter *painter);//绘制左边Y轴
 void drawTickerY_R(QPainter *painter);//绘制右边Y轴

 void wheelEvent(QWheelEvent *event);//滚轮事件，缩放曲线图像
 void mousePressEvent(QMouseEvent *event);//按下事件，记录坐标和按下标志
 void mouseReleaseEvent(QMouseEvent *event);//抬起事件，取消按下标志
 void mouseMoveEvent(QMouseEvent *event);//鼠标移动事件，移动曲线
 void showEvent(QShowEvent *event);//显示事件
 bool event(QEvent *event);//事件，实现多点触控功能，目前只对两个触控点做了处理

public:
 QPixmap m_PixMapCursor;//跟踪点绘制图像缓冲
 Tracking m_Tracking;
protected:
 Ticker *m_TickerX;
 Ticker *m_TickerL;
 Ticker *m_TickerR;

 bool IsPress=false;
 bool m_IsTouch=false;

 QPoint m_ClickedPoint;
 qreal m_scaleFactorX=0.0;
 qreal m_scaleFactorY=0.0;
 QList<_XYList> m_XyGraph;

 QColor m_BackgroundColor;
 bool m_IsDrawPath;//是否绘制曲线，在多线程添加数据的时候调用，添加数据时禁止绘制曲线
private:
 friend class Ticker;
};

class CurveWid : public QWidget
{
  Q_OBJECT
public:
  explicit CurveWid(QWidget *parent = nullptr);

  void DataInit();
  void reUpdate();
  void reUpdateAll();
signals:

public slots:
  void slots_UpdateUI();
  void slots_TimeOut();
protected:
  void paintEvent(QPaintEvent *event);
public:
  CoorAxis *m_AxisX;
  CoorAxis *m_AxisL;
  CoorAxis *m_AxisR;

  Plot *m_Plot;
  QTimer *m_Timer;
};


#endif // PLOT_H

头文件plotdata.h

/*
* 作者:老人与海 
* 博客:https://blog.csdn.net/qq_41340733
* 代码不保证稳定性，请勿用于商业用途
*/


#ifndef PLOTDATA_H
#define PLOTDATA_H

#include <QObject>
#include <QVector>
#include <QColor>
class CoorAxis;

//_COORDINATEVALUE单个数据点结构体
typedef struct _COORDINATEVALUE
{
  double Key;
  double Value;
  _COORDINATEVALUE()
  {
      Key=0;
      Value=0;
  }
}_COORDINATEVALUE;
//坐标轴绘制的文本类型，包括时间毫秒，时间秒，数值
typedef enum _TEXT_TYPE
{
  _TimeMs,
  _TimeS,
  CountVal
}_TEXT_TYPE;
//坐标轴类型，XAxis表示X轴,YAxis_L表示左边的Y轴,YAxis_R表示右边的Y轴
typedef enum _TICKERTYPE
{
  XAxis=0,
  YAxis_L=1,
  YAxis_R=2
}_TICKERTYPE;
//坐标缩放前的坐标值，_begVal坐标起始值，_endVal坐标结束值，_siteVal坐标中点，
//多点触控的时候先记录坐标的原始值，然后根据手势距离对原始进行缩放
typedef struct _Scale
{
  double _begVal=0.0;
  double _endVal=0.0;
  double _siteVal=0.0;
}_Scale;

/**
* @brief The _XYList class
* 功能：单条曲线的数据结构类型，包括坐标轴类型，曲线颜色，
* 最多可绘制的曲线点数，等功能等；
*/
class _XYList
{
public:
  explicit _XYList();
  virtual ~_XYList(){}

  int Count();//实际有效的数据点
  int CountAll();//所有的数据点，包括被移除的记录
  int getRemoveCount(){ return  m_removeCount; }
  _COORDINATEVALUE &getPoint(int index);
  void addData(const double Key,const double Value);
  void removefirst();
  void cleanBuff();
  int size() const { return m_CoodValue.size()-m_removeCount; }
  QVector<_COORDINATEVALUE> *data();

  void setPointCountMax(int Count);
  int getPointMax(){ return m_MaxPointCount; }
  void setColor(QColor color){ m_Color=color; }
  QColor getColor(){ return m_Color; }
  void setAxisType(_TICKERTYPE type){ m_Type=type; }
  _TICKERTYPE &getAixsType(){ return m_Type; }

  int getBegindex(const double &TmpKey);
  int getEndindex(const double &TmpKey);
  int getCoorToIndex(const double &TmpKey);

  _COORDINATEVALUE getTrackValue(){ return TrackValue; }
  void setTrackValue(const _COORDINATEVALUE value){ TrackValue=value; }
  void setTrackValue(const double key,const double value){
      TrackValue.Key=key;
      TrackValue.Value=value;
  }
  bool TracckIsValid(){ return IsValid; }
  void setTrackIsvalid(bool val){ IsValid=val; }

  void setVisible(bool val){ m_Visible=val; }
  bool getVisible(){ return m_Visible; }

  _COORDINATEVALUE getMaxValue(){ return m_MaxValue; }
  _COORDINATEVALUE getMinValue(){ return m_MinValue; }

  QVector<_COORDINATEVALUE>::const_iterator constBegIte(){ return (m_CoodValue.begin()+m_removeCount); }
  QVector<_COORDINATEVALUE>::const_iterator constEndIte(){ return m_CoodValue.end(); }
protected:
  QVector<_COORDINATEVALUE> m_CoodValue;
  int m_MaxPointCount;//实际数据点，根据总数据点是否达到这和数目而对m_removeCount进行操作
  int m_removeCount;//被移除的次数，会先记录，到达一定数据时候会重新分分配m_CoodValue大小，提高了添加固定点数据时候的速度
  _TICKERTYPE m_Type;
  QColor m_Color;
  _COORDINATEVALUE TrackValue;//踪点的值
  bool IsValid;//判断跟踪点的值是否有效
  bool m_Visible;//是否绘制，既可见度

  _COORDINATEVALUE m_MaxValue;
  _COORDINATEVALUE m_MinValue;
};
/**
* @brief The Ticker class
* 坐标轴数据结构类，这里描述了坐标的主刻度，子刻度，刻度长度，
* 坐标范围，坐标轴的类型（X还是Y 参考_TICKERTYPE）等信息
*/
class Ticker
{
public:
  explicit Ticker()
  {
     MainLineCount=15;
     SubLineCount=6;
     Mainlength=10;
     Sublength=10;
     Type=_TICKERTYPE::XAxis;
     m_RangeBeg=0;
     m_RangeEnd=500;
  }
  virtual ~Ticker(){}

  void setMainLineCount(const int count){ MainLineCount=count; }
  void setSubLineCount(const int count){ SubLineCount=count; }
  void setMainLineLength(const int length){ Mainlength=length; }
  void setSubLineLength(const int length){ Sublength=length; }
  void setAxisType(_TICKERTYPE type){ Type=type; }
  void setTextType(_TEXT_TYPE Type){ m_TextType=Type; }
  void setRangeBeg(const double &Value);
  void setRangeEnd(const double &Value);
  void setRange(const double &BegValue,const double &EndValue);
  void moveRange(const double &Value);//根据数值偏移，正数往前，负数往后
  void moveRangePercent(const double &Value);//根据百分比偏移，正数往前，负数往后
  void setZoom(const double value);//根据中心值进行缩放，大于1表示放大，小于1表示缩小

  int getMainLineCount(){ return MainLineCount; }
  int getSubLineCount(){ return SubLineCount; }
  int getMainLineLength(){ return Mainlength; }
  int getSubLineLength(){ return Sublength; }
  _TICKERTYPE getAxisType(){ return Type; }
  double getRangeBeg(){ return m_RangeBeg; }
  double getRangeEnd(){ return m_RangeEnd; }
  double getRangeMidvalue(){ return (m_RangeBeg+(m_RangeEnd-m_RangeBeg)/2.0); }//获取轴的中心值
  _Scale &getScale(){ return m_Scale; }
  void InitScale();
  void setScaleCoor(const double scaleFactor);//根据siteVal左边点进行缩放
  _TEXT_TYPE getTextType(){ return m_TextType; }
protected:
  int MainLineCount;
  int SubLineCount;
  int Mainlength;
  int Sublength;
  double m_RangeBeg;
  double m_RangeEnd;

  _TICKERTYPE Type;
  _TEXT_TYPE m_TextType;
  _Scale m_Scale;
private:
 friend class CoorAxis;
};
#endif // ADDPOINT_H

头文件mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "qtimer.h"
#include "plot.h"
#include <QLabel>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE


class MainWindow : public QMainWindow
{
  Q_OBJECT

public:
  MainWindow(QWidget *parent = nullptr);
  ~MainWindow();

public slots:
  void slots_TimeOut();
  void slots_Refresh();
  void slots_UpdateTrack();
protected:
  QTimer *m_Timer;
  QTimer *m_TimerRefresh;

  CurveWid *m_Curve;

  QVector<QLabel *> m_labList;
  bool IsAddOk=false;
private:
  Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

c文件

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QDateTime>
#include <QDebug>
#include "qgridlayout.h"
#include "math.h"
#include "qpainter.h"
#include <QVBoxLayout>
#include <QGridLayout>

#define _POINTCOUNT 50000
MainWindow::MainWindow(QWidget *parent)
  : QMainWindow(parent)
  , ui(new Ui::MainWindow)
{
  ui->setupUi(this);
  ui->statusbar->hide();


  ui->centralwidget->setStyleSheet("QWidget{background-color: rgb(0, 0, 0);}");
  m_Curve=new CurveWid;
  connect(m_Curve->m_Plot,&Plot::sig_UpdateTrack,this,&MainWindow::slots_UpdateTrack);

  m_Timer=new QTimer(this);
  m_TimerRefresh=new QTimer(this);
  m_Timer->start(100);
  m_TimerRefresh->start(100);
  connect(m_Timer,&QTimer::timeout,this,&MainWindow::slots_TimeOut);
  connect(m_TimerRefresh,&QTimer::timeout,this,&MainWindow::slots_Refresh);

  m_Curve->m_AxisL->ticker()->setRange(-100,1200);
  m_Curve->m_AxisR->ticker()->setRange(-100,600);
  m_Curve->m_AxisX->ticker()->setRange(-100,_POINTCOUNT*0.01);
  qint64 Time=QDateTime::currentMSecsSinceEpoch();
  m_Curve->m_AxisX->ticker()->setTextType(_TEXT_TYPE::_TimeMs);
//    m_Curve->m_AxisX->ticker()->setRange(Time-600000,Time);

  QGridLayout *G_layout=new QGridLayout;
  G_layout->setVerticalSpacing(3);
  G_layout->setContentsMargins(0,0,0,0);
  qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
  for(int i=0;i<16;i++)
  {
      QLabel *labValue=new QLabel;
      labValue->setText(QString("Qlabel %1").arg(i+1));
      labValue->setAlignment(Qt::AlignCenter);
      labValue->setStyleSheet("QLabel{color:rgb(0, 122, 255);}");
      labValue->setFixedHeight(36);
      G_layout->addWidget(labValue,i/8,i%8);

      QColor color=QColor(qrand() % 256, qrand() % 256, qrand() % 256);
      int r,g,b;
      color.getRgb(&r,&g,&b);
      labValue->setStyleSheet(QString("QLabel{ color:rgb(%0,%1,%2);}").arg(r).arg(g).arg(b));
      m_labList.append(labValue);

      m_Curve->m_Plot->addGraph();
      m_Curve->m_Plot->Graph(i)->setColor(color);
      m_Curve->m_Plot->Graph(i)->setPointCountMax(_POINTCOUNT);
      if((i%2)!=0){
          m_Curve->m_Plot->Graph(i)->setAxisType(_TICKERTYPE::YAxis_R);
      }else{
          m_Curve->m_Plot->Graph(i)->setAxisType(_TICKERTYPE::YAxis_L);
      }
  }

  QVBoxLayout *V_layout=new QVBoxLayout;
  V_layout->setContentsMargins(0,0,0,0);
  V_layout->addWidget(m_Curve);
  V_layout->addLayout(G_layout);

  ui->centralwidget->setLayout(V_layout);


  for(int i=0;i<_POINTCOUNT*0.01;i++){
      slots_TimeOut();
  }
  IsAddOk=true;
}

MainWindow::~MainWindow()
{
  delete ui;
}

void MainWindow::slots_TimeOut()
{
  double w = (3.14/100)*5;  //w为角速度 ，可以理解为波浪的密度，越大密度越大
  double A = 40;    //  A表示振幅,可以理解为水波的高度,越大高度越高
  static double x;
  x++;
  double waveY = (double)(A * sin(w * x ));// waveY随着x的值改变而改变，从而得到正弦曲线

  static double count=0;
  count+=1;
  qint64 Time=QDateTime::currentMSecsSinceEpoch();
  for(int i=0;i<m_Curve->m_Plot->getGraphCount();i++)
  {
      int num = qrand()%(200-100)+100;//产生300-500范围的随机岁
      float data=0;//除以10获取 30.0到50.0的随机数
      data+=80*i+num;
//        m_Curve->m_Plot->Graph(i)->addData(count,data);
      m_Curve->m_Plot->Graph(i)->addData(count,waveY+80*i);
  }

  if(IsAddOk)
  {
      if(count>m_Curve->m_AxisX->ticker()->getRangeEnd())
      {
          m_Curve->m_AxisX->ticker()->moveRange(count-m_Curve->m_AxisX->ticker()->getRangeEnd());
      }
  }
}

void MainWindow::slots_Refresh()
{
  m_Curve->reUpdateAll();
}

void MainWindow::slots_UpdateTrack()
{
  for(int i=0;i<m_Curve->m_Plot->getGraphCount();i++){
      m_labList[i]->setText(QString::number(m_Curve->m_Plot->Graph(i)->getTrackValue().Value,'f',2));
  }
}

源码下载

工程：TestCurve
链接: 源码下载

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原文链接：https://blog.csdn.net/qq_41340733/article/details/121090323