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Qt 实现雷达图_qt 雷达航迹图

作者：盐析白兔 | 2024-03-01 03:11:51

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qt 雷达航迹图

利用 QPainter实现雷达图（玫瑰图）。效果如下：
这里写图片描述这里写图片描述这里写图片描述

源码如下
.h文件

#ifndef CRADARDLG_H
#define CRADARDLG_H

#include <QWidget>
#include <QPainter>
#include <QPainterPath>
#include <QMap>
#include "qmath.h"

enum RadarType
{
    Radar=0,  //雷达图
    Spider    //蜘蛛网图
};

enum PointTpye
{
    ScatterPoints=0, //散点图
    LinePoints       //连线图
};

typedef struct RadarData
{
    QColor color;
    QMap<qreal,qreal> datamap;           //key : 角度 value：值 
    QMap<qreal,qreal> transitiondatmap;  //key : 角度 value：转换的值 


}RadarData;

#define  PI 3.14159


class CRadarDlg : public QWidget
{
    Q_OBJECT

public:
    CRadarDlg(QWidget *parent = 0);
    ~CRadarDlg();

    void setRadarType(RadarType radartype);
    void setPointTpye(PointTpye pointstype);
protected:
    void paintEvent(QPaintEvent *e);

private:
    void init();
    void drawRadarType(QPainter *painter);
    void drawRadar(QPainter *painter);
    void drawSpider(QPainter *painter);
    void drawAxisLabel(QPainter *painter);
    void drawLabel(QPainter *painter);
    void drawData(QPainter *painter);
    void drawScatterPoints(QPainter *painter);
    void drawLinePoints(QPainter *painter);


private:
    RadarType m_radartype;
    PointTpye m_pointstype;
    int m_cylindernum;  //圈数
    int m_lineangle;    //角度，决定多少。默认是30
    int m_Axis_max,m_Axis_min; //最大最小
    QStringList m_AxisLabelList; //标签 刻度标签
    QStringList m_labelList;     //外围标签
    bool m_showAxisLabel;
    bool m_showLabel;   

    QMap<int,RadarData> m_datamap;  //key 表示组，value表示对于的值
    QList<QColor> m_colorlist;



};

#endif // CRADARDLG_H

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cpp文件

#include "cradardlg.h"

CRadarDlg::CRadarDlg(QWidget *parent)
    : QWidget(parent)
{
    init();
}

CRadarDlg::~CRadarDlg()
{

}

void CRadarDlg::setRadarType( RadarType radartype )
{
    m_radartype = radartype;
}

void CRadarDlg::setPointTpye( PointTpye pointstype )
{
    m_pointstype = pointstype;
}


void CRadarDlg::init()
{
    setRadarType(Radar);
    setPointTpye(LinePoints);
    m_cylindernum = 5;  //默认6圈
    m_lineangle = 30; //默认30度
    m_showAxisLabel = true;
    m_Axis_min = 0;
    m_Axis_max = 100;
    m_AxisLabelList << "0" << "20" << "40" << "60" << "80" << "100";

    m_colorlist << QColor(136,68,255);
    m_colorlist << QColor(102,170,238);
    m_colorlist << QColor(146,39,143);
    m_colorlist << QColor(238,187,34);
    m_colorlist << QColor(238,187,34);
    m_colorlist << QColor(238,187,34);
    m_colorlist << QColor(141,198,63);
    m_colorlist << QColor(255,242,0);

    for (int i = 0 ; i < 360; i+=m_lineangle)
    {
        m_labelList << QString("%1").arg(i);
    }
    RadarData tlist1,tlist2;
    QMap<qreal,qreal> datamap,datamap2;
    for (int i = 0; i < 10;++i)
    {
        datamap2 .insert (i*20,i*10);
        datamap .insert(i*30,i*5);
    }
    tlist2.color = QColor(136,68,255);;
    tlist1.color = QColor(146,39,143);;

    tlist1.transitiondatmap = datamap;
    tlist2.transitiondatmap = datamap2;

    m_datamap.insert(0,tlist2);
    m_datamap.insert(1,tlist1);

}


void CRadarDlg::paintEvent( QPaintEvent *e )
{
    QPainter *painter = new QPainter(this);
    painter->setRenderHint(QPainter::Antialiasing);
    painter->setRenderHint(QPainter::SmoothPixmapTransform);
    painter->setRenderHint(QPainter::TextAntialiasing);

    //添加背景颜色
//  painter->save();
//  painter->setBrush(Qt::blue);
//  painter->drawRect(0,0,width(),height());
//  painter->restore();
//////////////////////////////////////////////////////////////////////////

    drawRadarType(painter);
    drawAxisLabel(painter);
    drawLabel(painter);
    drawData(painter);

}


void CRadarDlg::drawRadarType( QPainter *painter )
{   
    switch (m_radartype)
    {
        case Radar:drawRadar(painter);break;
        case Spider:drawSpider(painter);break;
        default:drawRadar(painter);break;
    }
}


void CRadarDlg::drawRadar( QPainter *painter )
{
    painter->save();
    QPen pen;
    QColor color(Qt::lightGray);
    pen.setWidthF(0.4);
    //pen.setColor(color/*.lighter(100)*/); //添加线的颜色
    painter->setPen(pen);

    QPainterPath looppath;
    int w = width();
    int h = height();

    int count = m_cylindernum; 
    int radius = qMin(w,h);
    int step = radius/(count+1);  //加1是为了四周留出空间，写标签
    int x = w*0.2;
    int y = h*0.2;

    QRectF outrect;
    for (int i = 1; i < count+1; ++i)
    {
        radius = step*i;
        x = w/2-radius/2;
        y = h/2-radius/2;
        QRectF rect(x,y,radius,radius);
        looppath.addEllipse(rect);
        outrect = rect;
    }
    painter->drawPath(looppath);
//////////////////////////////////////////////////////////////////////////

    if (m_lineangle == 0)
    {
        m_lineangle =90;
    }
    int linecount = 360/m_lineangle; 
    int x0 = w/2 ;
    int y0 = h/2;
    int newradius = outrect.height()/2;
    for (int i = 0 ; i < linecount; ++i)
    {
        int x1 = x0 + newradius*qSin(PI*2/linecount*i);
        int y1 = y0 + newradius*qCos(PI*2/linecount*i);

        painter->drawLine(x0,y0,x1,y1);
    }

    painter->restore();

}

void CRadarDlg::drawSpider( QPainter *painter )
{
    painter->save();
    QPen pen;
    QColor color(Qt::lightGray);
    pen.setWidthF(0.4);
    //pen.setColor(color/*.lighter(100)*/); //添加线的颜色
    painter->setPen(pen);

    QPainterPath looppath;
    int w = width();
    int h = height();
    if (m_lineangle == 0)
    {
        m_lineangle =90;
    }

    int  laycount = m_cylindernum;  //默认是几层 

    int count = 360/m_lineangle; 
    int radius = qMin(w,h)/2;
    int x0 = w/2 ;
    int y0 = h/2;

    for (int j = 1 ; j < laycount+1; ++j)
    {
        int newradius = radius*j/(laycount+1);
        for (int i = 0 ; i < count; ++i)
        {
            int x1 = x0 + newradius*qSin(PI*2/count*i);
            int y1 = y0 + newradius*qCos(PI*2/count*i);
            painter->drawLine(x0,y0,x1,y1);

            int x2;
            int y2; 
            if (i == count*2-1)
            {
                x2 = x0 + newradius*qSin(0);
                y2 = y0 + newradius*qCos(0);
            }
            else
            {
                x2 = x0 + newradius*qSin(PI*2/count*(i+1));
                y2 = y0 + newradius*qCos(PI*2/count*(i+1));
            }
            painter->drawLine(x1,y1,x2,y2);
        }
    }
    painter->drawPath(looppath);

    painter->restore();

}

void CRadarDlg::drawAxisLabel( QPainter *painter )
{
    if (!m_showAxisLabel) return;

    painter->save();

    //QPen pen;
    //QColor color(Qt::lightGray);
    //pen.setColor(color/*.lighter(100)*/); //添加线的颜色
    //painter->setPen(pen);


    int  laycount = m_cylindernum;  //默认是几层 
    int w = width();
    int h = height();
    int count = 360/m_lineangle; 
    int radius = qMin(w,h)/2;
    int x0 = w/2 ;
    int y0 = h/2;

    QFont font;
    int fontsize = 10;
    if (h > 500)
        fontsize = 15;
    font.setPointSize(fontsize);
    painter->setFont(font);

    for (int j = 0 ; j < laycount+1; ++j)
    {
        int newradius = radius*j/(laycount+1);
        int x1 = x0 + newradius*qSin(PI);
        int y1 = y0 + newradius*qCos(PI)+20;
        if (j < m_AxisLabelList.count())
        {
            painter->drawText(x1,y1,m_AxisLabelList.at(j));
        }
    }

    painter->restore();
}

void CRadarDlg::drawLabel( QPainter *painter )
{
    if (!m_showLabel) return;

    painter->save();

    //QPen pen;
    //QColor color(Qt::lightGray);
    //pen.setColor(color/*.lighter(100)*/); //添加线的颜色
    //painter->setPen(pen);


    int  laycount = m_cylindernum;  //默认是几层 
    int w = width();
    int h = height();
    int count = 360/m_lineangle; 
    int radius = qMin(w,h)/2;
    int x0 = w/2 ;
    int y0 = h/2;

    QFont font;
    int fontsize = 10;
    if (h > 500)
        fontsize = 15;
    font.setPointSize(fontsize);
    painter->setFont(font);


    for (int i = 0 ; i < count; ++i)
    {
        int newradius = radius*laycount/(laycount+1)+10;
        newradius = newradius+10*qSin(PI*2/count*i);
        int x1 = x0 - newradius*qSin(PI*2/count*i);
        int y1 = y0 - newradius*qCos(PI*2/count*i);

        if (y0 < y1 && x0 < x1)
        {
            y1 -= fontsize*qSin(PI*2/count*i);
        }
        else
        {
            if (x1 < x0)
                x1-=fontsize;
            y1 += fontsize*qSin(PI*2/count*i);
        }

        if (i < m_labelList.count())
        {
            painter->drawText(x1,y1,m_labelList.at(i));
        }

    }

    painter->restore();
}

void CRadarDlg::drawData( QPainter *painter )
{
    switch(m_pointstype)
    {
    case ScatterPoints:drawScatterPoints(painter);break;
    case LinePoints:drawLinePoints(painter);break;
    default:drawLinePoints(painter);break;
    }

}

void CRadarDlg::drawScatterPoints( QPainter *painter )
{
    painter->save();

    int w = width();
    int h = height();
    int count = 360/m_lineangle; 
    int radius = qMin(w,h)/2*m_cylindernum/(m_cylindernum+1);

    QList<int> keyilist = m_datamap.keys();

    qreal step = 1.0*radius/(m_Axis_max-m_Axis_min);
    foreach (qreal key, keyilist)
    {
        RadarData rdata = m_datamap.value(key);
        QColor color = rdata.color;
        painter->setPen(color.darker(200));
        painter->setBrush(color.darker(200));
        foreach (qreal angle ,rdata.transitiondatmap.keys())
        {
            qreal length = step*rdata.transitiondatmap.value(angle);
            angle+=90; //因为转90
            QPointF certp(w/2 + length*qCos(angle*PI/180),h/2 - length*qSin(angle*PI/180));
            painter->drawEllipse(certp,2,2);

        }
    }

    painter->restore();
}

void CRadarDlg::drawLinePoints( QPainter *painter )
{
    painter->save();

    int w = width();
    int h = height();
    int count = 360/m_lineangle; 
    int radius = qMin(w,h)/2*m_cylindernum/(m_cylindernum+1);

    QList<int> keyilist = m_datamap.keys();

    qreal step = 1.0*radius/(m_Axis_max-m_Axis_min);

    foreach (qreal key, keyilist)
    {
        RadarData rdata = m_datamap.value(key);
        QPainterPath path;
        int  i = 0;
        QPointF startp;

        QColor color = rdata.color;
        painter->setPen(color.darker(200));
        painter->setBrush(color.darker(200));
        foreach (qreal angle ,rdata.transitiondatmap.keys())
        {
            qreal length = step*rdata.transitiondatmap.value(angle);
            angle+=90; //因为转90
            QPointF certp(w/2 + length*qCos(angle*PI/180),h/2 - length*qSin(angle*PI/180));
            painter->drawEllipse(certp,2,2);
            if (i == 0)
            {
                path.moveTo(certp);
                startp = certp;
            }
            else
                path.lineTo(certp);
            ++i;
        }
        path.lineTo(startp);
        painter->setBrush(color.lighter(100));
        painter->drawPath(path);
    }


    painter->restore();
}

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