Qt自定义Plot实现曲线绘制的详细过程
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2022-03-13 10:23:29
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...
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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