Qt使用QPainter实现雷达图（玫瑰图）

利用 QPainter实现雷达图（玫瑰图）。效果如下：

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 3.14159class CRadarDlg : public QWidget
{Q_OBJECTpublic: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30int 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

//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90QPointF 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90QPointF 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;}elsepath.lineTo(certp);++i;}path.lineTo(startp);painter->setBrush(color.lighter(100));painter->drawPath(path);}painter->restore();
}

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Qt使用QPainter实现雷达图（玫瑰图）

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