QT 绘制雷达图_qt雷达图

RadarWidget.h

#pragma once
 
#include <QWidget>
#include "ui_RadarWidget.h"
#include <QPainter>
#include <QPaintEvent>
#include <QTimerEvent>
#include <QRect>
#include <QMouseEvent>
#include <iostream>
#include <QKeyEvent>
#include <math.h>
class RadarWidget : public QWidget
{
    Q_OBJECT
 
public:
    RadarWidget(QWidget *parent = Q_NULLPTR);
    
 
    virtual void paintEvent(QPaintEvent* event);
 
    virtual void timerEvent(QTimerEvent* event);
 
    virtual void wheelEvent(QWheelEvent* event);
 
    virtual void mouseMoveEvent(QMouseEvent *event);
 
    virtual void keyPressEvent(QKeyEvent* event);
 
    virtual void resizeEvent(QResizeEvent* event);
 
   //获取角度对应的圆弧点
    QPointF trans(int angle);
 
    //获取中心点
    QPointF GetCentrePT();
 
    //获取矩形
    QRect GetCenterRect(QPointF point);
 
 
    QPointF CustomRotate(QPointF point, qreal from_angle, qreal rotate);
private:
    //缩放系数
    float m_zoom;   
    //widget的尺寸
    QRect _rect;
    //记录绘图中心点
    QPoint m_point;
    //扇区渐变角度
    int m_Angle;
    //扇区每次移动角度
    int Speed;
 
    int m_nRadius;
 
    
    int m_iRet;
 
    Ui::RadarWidgetClass ui;
};

RadarWidget.cpp

#include "RadarWidget.h"
#define PI 3.1415926
 
 
RadarWidget::RadarWidget(QWidget *parent)
    : QWidget(parent)
{
    ui.setupUi(this);
 
    m_zoom = 1.0;
    Speed = 1;
 
    _rect = this->rect();
 
	m_point.setX(_rect.width() / 2);
	m_point.setY(_rect.height() / 2);
    m_Angle = 0;
    //开启鼠标追踪
    setMouseTracking(true);
 
    this->startTimer(100);
}
 
void RadarWidget::paintEvent(QPaintEvent* event)
{
    QPainter painter(this);
    painter.setPen(QColor(Qt::white));
 
    //开启反锯齿
    painter.setRenderHint(QPainter::Antialiasing, true);
 
    //将中心位置设置为坐标原点
     painter.translate(m_point.x(),m_point.y());
 
 
    //最小半径
     int iRet = _rect.height()/2/3*m_zoom;
     m_iRet = iRet;
     //画刻度
 
     QPoint line1;
     QPoint line2;
     line1.setX(0);
     line1.setY(0);
     line2.setX(0);
     line2.setY(-iRet * 3);
 
     //画线
     QLineF n_line(line1, line2);
      for (int i = 0; i < 12; i++)
      {
          n_line.setAngle(i * 30.0);
          painter.drawLine(n_line);
         
      }
 
     //画角度
     for (int i = 0; i < 12; i++)
     {
 
          int drawangel =  i * 30;
          //角度转弧度
          QPointF pt = trans(drawangel);
 
         // painter.drawLine(GetCentrePT(), pt);
 
          QString strText = QString::number(drawangel);  //设置当前字体
 
          painter.save();
 
 
 
 		 //【1】偏移坐标原点到需要绘制刻度的位置
 		 painter.translate(pt);
 
 		 //【2】旋转指定的角度
 		 painter.rotate(drawangel);
 
 		 //【3】 画刻度
 		 painter.drawText(GetCentrePT().x(), GetCentrePT().y(),strText);
 
 		 painter.restore();
 
	
     }
 
     //画刻度  360°
     for (int i = 0; i < 360; i++)
     {
		 QPointF optintold;
		 optintold.setX(cos(PI * 2 / 360 * i) * m_iRet * 3);
		 optintold.setY(sin(PI * 2 / 360 * i) * m_iRet * 3);
 
 		 QPointF optintnew;
         int nes = m_iRet * 3 -10;
 
 		 optintnew.setX(cos(PI * 2 / 360 * i) * nes);
 		 optintnew.setY(sin(PI * 2 / 360 * i) * nes);
 
 
         painter.drawLine(optintnew, optintold);
 
     }
 
 
 
     //画同心圆 及   量程
      for (int i = 0; i < 4; i++)
      {
          QPoint point;
          point.setX(0);
          point.setY(0);
 		 painter.drawEllipse(point,
              iRet*i, iRet * i);
 
         painter.drawText(GetCentrePT().x(), GetCentrePT().y()-iRet * i, QString::number(i*50));
      }
 
     //圆锥渐变
// 	 QConicalGradient ConicaGrad(0,0,0);
//      QColor i_color = QColor(14,255,11);
//      i_color.setAlpha(100);
//      ConicaGrad.setColorAt(0, i_color);
//      i_color.setAlpha(50);
//      ConicaGrad.setColorAt(0.1, i_color);
//       i_color.setAlpha(0);
//       ConicaGrad.setColorAt(1, i_color);
// 	 painter.setBrush(QBrush(ConicaGrad));
  
 
     QRect ReFar(-_rect.height() / 2 * m_zoom, -_rect.height() / 2 * m_zoom, _rect.height() * m_zoom, _rect.height() * m_zoom);
     painter.setBrush(QColor(84, 135, 29,90));
     painter.drawPie(ReFar,m_Angle * 16, 70*16);
 
}
 
void RadarWidget::timerEvent(QTimerEvent* event)
{
 
    m_Angle += Speed;
    if (m_Angle > 360)
        m_Angle = 0;
    update();
}
 
void RadarWidget::wheelEvent(QWheelEvent* event)
{
    if (event->delta() > 0)
    {
		m_zoom += 0.1;
    }
    else
    {
        m_zoom -= 0.1;
    }
    update();
 
}
 
 
void RadarWidget::mouseMoveEvent(QMouseEvent* event)
{
    //判断是否为左键按下
    if (Qt::LeftButton & event->buttons())
    {
		m_point.setX(event->pos().x());
		m_point.setY(event->pos().y());
 
    }
 
}
 
void RadarWidget::keyPressEvent(QKeyEvent* event)
{
    //TODO:控制雷达旋转速度 <- 速度+  -> 速度- 
 
     if (Qt::Key_Left == event->key())
     {
         if (Speed >= 10)
             Speed = 10;
         Speed++;
 
     }
     else if (Qt::Key_Right == event->key())
     {
         if (Speed < 1)
             Speed = 1;
         Speed--;
     }
 
}
 
void RadarWidget::resizeEvent(QResizeEvent* event)
{
    m_point.setX(event->size().width() / 2);
    m_point.setY(event->size().height() / 2);
    m_nRadius = (event->size().height() - 50) / 2;
}
 
QPointF RadarWidget::trans(int angle)
{
	QPointF ptResult(GetCentrePT());
	//[角度转弧度]
	//float rad = qDegreesToRadians(static_cast<float>(angle));
 
    float rad = (float)angle / 180 * PI;
	ptResult.setX(GetCentrePT().x() + m_iRet * 3 *sin(static_cast<qreal>(rad)));
	ptResult.setY(GetCentrePT().y() - m_iRet * 3 *cos(static_cast<qreal>(rad)));
 
	return ptResult;
 
}
 
QPointF RadarWidget::GetCentrePT()
{
 
    QPointF pointf;
 
    pointf.setX(0);
    pointf.setY(0);
    return pointf;
}
 
QRect RadarWidget::GetCenterRect(QPointF point)
{
    QRect rect;
    rect.setX(point.x());
    rect.setY(point.y());
    rect.setWidth(50);
    rect.setHeight(50);
 
    return rect;
 
}
 
QPointF RadarWidget::CustomRotate(QPointF point, qreal from_angle, qreal rotate)
{
 
	QPointF Tmp;
	qreal arc = (rotate - from_angle) / 180 * PI;
	qreal Length = sqrt(point.x() * point.x() + point.y() * point.y());
	Tmp.setX(Length * cos(arc));
	Tmp.setY(Length * sin(arc));
	return Tmp.toPoint();
}