QT自定义控件-雷达图

#include "RadarCtrl.h" #include <QPainter> #include <math.h> RadarCtrl::RadarCtrl(QWidget *parent,int h) : QWidget(parent) { setFixedSize(h+100,h); m_type = e_polygon; m_colorCircle = Qt::gray; m_nCount = 0; } RadarCtrl::~RadarCtrl() { QMap<QString,QCheckBox*>::Iterator it = m_mapCheckbox.begin(); for(;it!=m_mapCheckbox.end();it++) { delete it.value(); } m_mapCheckbox.clear(); } //设置雷达图的显示方式 void RadarCtrl::setShowType(ERadarPicType e) { m_type = e; } //设置雷达图的要素 void RadarCtrl::setElementName(QStringList ele) { m_listEle = ele; } //设置雷达图要素的最大值 void RadarCtrl::setMaxVaue(QList<int> val) { m_listMaxVal.clear(); m_listMaxVal = val; } //添加数据 void RadarCtrl::addData(QString name, QList<double> data) { m_nCount++; QColor cc = getColor(); QCheckBox* box = new QCheckBox(this); box->setFixedWidth(100); box->setText(name); box->setChecked(true); //设置checkbox背景色 QPalette pe ; pe.setBrush(QPalette::WindowText,cc); box->setPalette(pe); connect(box,SIGNAL(clicked()),this,SLOT(slotCheckBoxClicked())); //添加前缀，为了保证先加入的先画，不会因为QMAP的自动排序打乱顺序 name = QString("%1").arg(m_nCount,3,10,QLatin1Char('0')) + name; m_mapdata.insert(name,data); m_mapcolor.insert(name,cc); //添加到map中 m_mapCheckbox.insert(name,box); //调整checkbox的位置 int het = 30; int top = (this->height() - m_mapCheckbox.size() * het)/2; QMap<QString,QCheckBox*>::Iterator it = m_mapCheckbox.begin(); for(int i = 0;it!=m_mapCheckbox.end();it++,i++) { QCheckBox* box = it.value(); box->move(this->width() - 100,top + i * het); } } //设置圆环填充色 void RadarCtrl::setCircleColor(QColor c) { m_colorCircle = c; } //绘制 void RadarCtrl::paintEvent(QPaintEvent *) { int nradius = (this->height() - 100)/2; //这里的100，需要根据字符串像素大小调整，使得能够放下雷达顶点的要素名称 int nstep = nradius/5; nradius = 5*nstep; //确保5等分 double thta = 360.0/m_listEle.size(); //计算雷达图中心点的位置 int centx = this->height() /2; int centy = centx; QPainter painter(this); painter.save(); painter.setRenderHint(QPainter::Antialiasing); //设置反锯齿 //计算顶点的位置 QList<QPointF> ls1,ls2,ls3,ls4,ls5; //保存雷达图每层的顶点 ls1 = caculateVertex(centx,centy,nradius,thta,m_listEle.size()); ls2 = caculateVertex(centx,centy,nradius-nstep,thta,m_listEle.size()); ls3 = caculateVertex(centx,centy,nradius-2*nstep,thta,m_listEle.size()); ls4 = caculateVertex(centx,centy,nradius-3*nstep,thta,m_listEle.size()); ls5 = caculateVertex(centx,centy,nradius-4*nstep,thta,m_listEle.size()); QPainterPath p1,p2,p3,p4,p5; //保存5层标准路径 //绘制圆环 if(m_type == e_circle) //圆形 { p1 = createCirclePath(centx,centy,nradius); p2 = createCirclePath(centx,centy,nradius - nstep); p3 = createCirclePath(centx,centy,nradius - 2*nstep); p4 = createCirclePath(centx,centy,nradius - 3*nstep); p5 = createCirclePath(centx,centy,nradius - 4*nstep); }else { p1 = createPolygonPath(ls1); p2 = createPolygonPath(ls2); p3 = createPolygonPath(ls3); p4 = createPolygonPath(ls4); p5 = createPolygonPath(ls5); } painter.drawPath(p1-p2); painter.setBrush(m_colorCircle); painter.drawPath(p2-p3); painter.setBrush(Qt::NoBrush); painter.drawPath(p3-p4); painter.setBrush(m_colorCircle); painter.drawPath(p4-p5); painter.setBrush(Qt::NoBrush); if(m_type == e_circle) painter.drawEllipse(QPointF(centx,centy),nradius - 4*nstep,nradius - 4*nstep); else painter.drawPath(p5); QFont font = painter.font(); //获取当前的字体（或者设置需要的字体） //font.setFamily(QString::fromUtf8("微软雅黑")); //font.setPointSize(12); //painter.setFont(font); //绘制基准线和文本 for(int i = 0; i< ls1.size(); i++) { //基准线 painter.setPen(Qt::black); painter.drawLine(QPointF(centx,centy),ls1.at(i)); //计算文本的宽度、高度，及所在的位置（宽度如果过长，考虑分行显示，也可以直接使用QLabel来容纳文本，然后调整QLabel的位置即可） QRect rc = getStringRect(m_listEle.at(i),font); //字符串的宽度与高度与字体有关 int xx,yy; if(ls1.at(i).x() == centx) xx = centx - rc.width()/2; else if(ls1.at(i).x() > centx) xx = ls1.at(i).x() + 5; else xx = ls1.at(i).x() - rc.width() - 5; if(i == 0) yy = ls1.at(0).y() - 5; else { if(ls1.at(i).y() < centy) yy = ls1.at(i).y() + rc.height()/2 - 3; else yy = ls1.at(i).y() + rc.height()/2 + 3; } //绘制文本 painter.drawText(xx,yy,m_listEle.at(i)); //yy是文本矩形的底部 } //绘制数据 QMap<QString,QList<double> >::Iterator it = m_mapdata.begin(); painter.setPen(Qt::NoPen); for(; it != m_mapdata.end();it++) { QCheckBox* box = m_mapCheckbox.find(it.key()).value(); if(box->isChecked()) { painter.setBrush(m_mapcolor.find(it.key()).value()); QPainterPath pt = createDataPath(centx,centy,nradius,it.value(),ls1); painter.drawPath(pt); } } painter.restore(); } //计算顶点的位置 QList<QPointF> RadarCtrl::caculateVertex(int centx,int centy,int radius, double thta, int nmb) { QList<QPointF> points; for(int i = 0;i<nmb; i++) { double ang = thta * i / 180.0 * M_PI; int x,y; if(ang <= M_PI/2) { x = sin(ang) * radius; y = cos(ang) * radius; x = centx + x; y = centy - y; }else if( ang > M_PI/2 && ang <= M_PI) { x = cos(ang - M_PI/2) * radius; y = sin(ang - M_PI/2) * radius; x = centx + x; y = centy + y; }else if( ang > M_PI && ang <= 1.5*M_PI ) { x = sin(ang - M_PI) * radius; y = cos(ang - M_PI) * radius; x = centx - x; y = centy + y; }else { x = sin(2*M_PI - ang) * radius; y = cos(2*M_PI - ang) * radius; x = centx - x; y = centy - y; } points.push_back(QPointF(x,y)); } return points; } //创建圆环路径 QPainterPath RadarCtrl::createCirclePath(int centx, int centy, int nradius) { QPainterPath path; path.moveTo(centx,centy); path.arcTo(QRect((height()-nradius*2)/2,(height()-nradius*2)/2,nradius*2,nradius*2) ,0,360); return path; } //创建多边形路径 QPainterPath RadarCtrl::createPolygonPath(QList<QPointF> points) { QPainterPath path; path.moveTo(points.at(0)); for(int i = 1; i< points.size(); i++) path.lineTo(points.at(i)); path.lineTo(points.at(0)); return path; } //获取字符串所占的像素宽度和高度 QRect RadarCtrl::getStringRect(QString str,QFont font) { QFontMetrics fm(font); QRect rect = fm.boundingRect(str); return rect; } //获取随机颜色 QColor RadarCtrl::getColor() { int r = 0; int g = 0; int b = 0; r += 22;g+= 34;b+=66; r = rand() % 256; g = rand() % 256; b = rand() % 256; return QColor(r,g,b,200); } //获取数据路径T