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mybattery.cpp
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mybattery.cpp
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#include "mybattery.h"
myBattery::myBattery(QWidget *parent) :
QWidget(parent)
{
m_bReverse=false;
m_value=100;
updateTimer=new QTimer(this);
updateTimer->setInterval(5);
connect(updateTimer,SIGNAL(timeout()),this,SLOT(UpdateGraph()));
}
void myBattery::paintEvent(QPaintEvent *e)
{
QPainter painter;
painter.begin(this);
painter.setRenderHint(QPainter::Antialiasing);
drawFrame(&painter);
drawBattery(&painter);
painter.end();
}
void myBattery::drawFrame(QPainter *painter)
{
painter->save();
m_headWidth=width()/20;
qreal batteryWidth=width()-m_headWidth;
QPointF topLeftPot(0,0);
QPointF bottomRightPot(batteryWidth,height());
QRectF batteryRect(topLeftPot,bottomRightPot);
m_batteryRect=batteryRect;
painter->setBrush(Qt::NoBrush);
painter->setPen(QPen(Qt::black,2));
painter->drawRect(batteryRect);
QPointF headRectTopLeft(batteryRect.topRight().x(),height()/4);
QPointF headRectBottomRight(width(),height()-height()/4);
QRectF headRect(headRectTopLeft,headRectBottomRight);
QLinearGradient headRectGradient(headRect.topLeft(),headRect.bottomLeft());
headRectGradient.setColorAt(0.0,QColor(150,150,150));
headRectGradient.setColorAt(0.5,QColor(220,220,220));
headRectGradient.setColorAt(1.0,QColor(150,150,150));
painter->setBrush(headRectGradient);
painter->drawRect(headRect);
painter->restore();
}
void myBattery::drawBattery(QPainter *painter)
{
painter->save();
QLinearGradient batteryGradient(QPointF(0,0),QPointF(0,height()));
if(m_value<20)
{
batteryGradient.setColorAt(0.0,QColor(220,220,220));
batteryGradient.setColorAt(0.7,QColor(180,50,50));
batteryGradient.setColorAt(1.0,QColor(120,50,50));
}
else
{
batteryGradient.setColorAt(0.0,QColor(220,220,220));
batteryGradient.setColorAt(0.7,QColor(0,180,0));
batteryGradient.setColorAt(1.0,QColor(0,120,0));
}
painter->setPen(Qt::NoPen);
painter->setBrush(batteryGradient);
QPointF topLeftPot(m_batteryRect.topLeft().x()+2,m_batteryRect.topLeft().y()+2);
qreal unit=m_batteryRect.width()/100;
qreal wid=m_value*unit;
QPointF bottomRightPot(wid,m_batteryRect.bottomRight().y()-2);
painter->drawRect(QRectF(topLeftPot,bottomRightPot));
painter->restore();
}
void myBattery::UpdateGraph()
{
if(m_bReverse)
{
m_value-=0.1;
if(m_value<=m_currentValue)
{
updateTimer->stop();
}
}
else
{
m_value+=0.1;
if(m_value>=m_currentValue)
{
updateTimer->stop();
}
}
emit valueChanged(m_value);
update();
}
void myBattery::setValue(qreal value)
{
if(value<0 || value>100)
{
qWarning() << "The value must be between 0 and 100 !";
return ;
}
if(value > m_value)
{
m_bReverse=false;
}
else if(value<m_value)
{
m_bReverse=true;
}
else
{
return ;
}
updateTimer->start();
m_currentValue=value;
update();
}