QPainter绘制雷达图（玫瑰图）

#include "radar.h" Radar::Radar(QWidget *parent) : QWidget(parent) { ui.setupUi(this); init(); } Radar::~Radar() { } void Radar::setRadarType(RadarType radartype) { m_radartype = radartype; } void Radar::setPointTpye(PointTpye pointstype) { m_pointstype = pointstype; } void Radar::init() { m_box1 = new QComboBox(); m_box2 = new QComboBox(); m_box1->addItem(QStringLiteral("Radars")); m_box1->addItem(QStringLiteral("Spiders")); m_box2->addItem(QStringLiteral("ScatterPoints")); m_box2->addItem(QStringLiteral("LinePoints")); m_box1->setGeometry(0, 0, 10, 8); m_box2->setGeometry(50, 50, 10, 8); //setRadarType(Radar); setRadarType(Radars); 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 Radar::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 Radar::drawRadarType(QPainter *painter) { switch (m_radartype) { case Radars:drawRadar(painter); break; case Spiders:drawSpider(painter); break; default:drawRadar(painter); break; } } void Radar::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 Radar::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 Radar::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 Radar::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 Radar::drawData(QPainter *painter) { switch (m_pointstype) { case ScatterPoints:drawScatterPoints(painter); break; case LinePoints:drawLinePoints(painter); break; default:drawLinePoints(painter); break; } } void Radar::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 Radar::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 s