Qt项目温湿度采集2

#include "humidity.h"
#include "ui_humidity.h"
#include <QMessageBox>

extern int Serial_Flag;
extern int ESP8266_Flag;

Humidity::Humidity(QWidget *parent) :
QWidget(parent),
ui(new Ui::Humidity)
{
ui->setupUi(this);
m_foreground = Qt::magenta;
m_background = Qt::black;
m_title = "H U M";
m_startAngle = 45;
m_endAngle = 45;
m_scaleMajor = 10;
m_minValue = 0;
m_maxValue = 100;
m_scaleMinor = 5;
Serial_H=0;
ESP8266_H=0;
Serial_Flag=0;
ESP8266_Flag=0;
m_value=0;
m_units = "℃";
m_precision = 0;
}

Humidity::~Humidity()
{
delete ui;
}
void Humidity::paintEvent(QPaintEvent *)
{
QPainter painter(this);
QFont font("宋体", 14);
painter.setFont(font);
painter.setRenderHint(QPainter::Antialiasing);
painter.translate(width() / 2, height() / 2);
int side = qMin(width(), height());
painter.scale(side / 400.0, side / 400.0);

drawCrown(&painter);
drawScaleNum(&painter);
drawScale(&painter);
drawTitle(&painter);
drawNumericValue(&painter);
drawIndicator(&painter);
}


void Humidity ::drawCrown(QPainter *painter)
{
painter->save();
int radius = 200;
painter->setBrush(m_background = QColor(20, 20, 20));
QLinearGradient lg1(0, -220, 0, 220);
lg1.setColorAt(0, Qt::darkBlue);
lg1.setColorAt(1, QColor(20, 20, 20));
painter->setBrush(lg1);
painter->setPen(Qt::NoPen);
painter->drawEllipse(-radius, -radius, radius << 1, radius << 1);
painter->setBrush(m_background = QColor(20, 20, 20));
painter->drawEllipse(-180,-180,360,360);
painter->restore();
}

void Humidity ::drawScaleNum(QPainter *painter)
{
painter->save();
painter->setPen(QPen(QColor(255,255,255)));
QFontMetricsF fm(this->font());
int radius = 200;
int r=(int)(radius*0.8);
int Angle=45;
int gap = (360-Angle*2) / 10;
for(int i=0; i<=10; i+=1)
    {
int angle = 90+Angle+gap*i;
float angleArc =( angle % 360) * M_PI / 180;
int x = (r)*cos(angleArc);
int y = (r)*sin(angleArc);
QString value =QString( "%1" ).arg(i*10);
int h = fm.size(Qt::TextSingleLine,value).height();
x = x -10;
y = y + h/2;
painter->drawText(QPointF(x, y),value);
    }
painter->restore();
}


void Humidity ::drawTitle(QPainter *painter)
{
painter->save();
painter->setPen(QColor(220,200,200,200));
//painter->setBrush(m_foreground);
QString str(m_title);
QFontMetricsF fm(this->font());
painter->drawText(-30, -50, str);
painter->restore();
}

void Humidity ::drawScale(QPainter *painter)
{
painter->save();
painter->rotate(m_startAngle);
int steps = (m_scaleMajor * m_scaleMinor);
double angleStep = (360.0 - m_startAngle - m_endAngle) / steps;
for (int i = 0; i <= steps; i++)
    {
if (i % m_scaleMinor == 0)
        {
QPen pen ;
pen.setColor(Qt::lightGray);
pen.setWidth(2);
painter->setPen(pen);
painter->drawLine(0, 125, 0, 145);
        }
else
        {
QPen pen ;
pen.setColor(Qt::darkGray);
pen.setWidth(1);
painter->setPen(pen);
painter->drawLine(0, 125, 0, 135);
        }
painter->rotate(angleStep);
    }
painter->restore();
}

void Humidity ::drawIndicator(QPainter *painter)
{
painter->save();
QPolygon pts;
pts.setPoints(5,-2,0,-4,30,0,120,4,30,2,0);
painter->rotate(m_startAngle);
double degRotate =  (360.0 - m_startAngle - m_endAngle)/(m_maxValue - m_minValue)*(m_value - m_minValue);
painter->rotate(degRotate);
QRadialGradient haloGradient(0, 0, 60, 0, 0);
haloGradient.setColorAt(0, QColor(60,60,60));
haloGradient.setColorAt(1, QColor(160,160,160));
painter->setPen(Qt::white);
painter->setBrush(haloGradient);
painter->drawConvexPolygon(pts);
painter->restore();

QColor niceBlue(150, 150, 200);
QConicalGradient coneGradient(0, 0, -90.0);
coneGradient.setColorAt(0.0, Qt::darkGray);
coneGradient.setColorAt(0.2, niceBlue);
coneGradient.setColorAt(0.5, Qt::white);
coneGradient.setColorAt(1.0, Qt::darkGray);
painter->setPen(Qt::NoPen);
painter->setBrush(coneGradient);
painter->drawEllipse(-8, -8, 16, 16);
}

void Humidity ::drawNumericValue(QPainter *painter)
{
if(Serial_Flag)
m_value=Serial_H;
if(ESP8266_Flag)
m_value=ESP8266_H;
QString str=" ";
str=str.number(m_value,'g',4);
QFontMetricsF fm(font());
double w = fm.size(Qt::TextSingleLine,str).width();
QFont font("times", 40);
painter->setFont(font);
painter->setPen(Qt::lightGray);
painter->drawText(-w-20 , 100, str);
}