void mySpeedWatch::drawIndicator(QPainter *painter)
{
painter->save();
QPolygon pts;
pts.setPoints(3, -2,0, 2,0, 0,60); /* (-2,0)/(2,0)/(0,60) */
painter->rotate(m_startAngle);
double degRotate = (360.0 - m_startAngle - m_endAngle)/(m_maxValue - m_minValue)*(m_value - m_minValue);
//画指针
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();
//画中心点
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(-5, -5, 10, 10);
}
void QMeter::drawNeedle(QPainter *painter)
{
// hat shadow
// painter->setPen(Qt::NoPen);
// painter->setBrush(QColor(120,120,120,10));
// painter->drawEllipse(-5, -6, 14, 14);
// end hat shadow
painter->save();
painter->rotate(-90.0);
QPolygon pts;
pts.setPoints( 3, -2,0, 2,0, 0,30 );
QPolygon shadow;
shadow.setPoints(3, -1,0, 1,0, 0,29);
int degRotate=0;
degRotate = (int)( m_startAngle+(m_endAngle-m_startAngle)/(m_maxValue-m_minValue)*(m_value-m_minValue) );
painter->rotate( -degRotate );
QRadialGradient haloGradient(0, 0, 20, 0, 0);
haloGradient.setColorAt(0.0, QColor(255,120,120));
haloGradient.setColorAt(1.0, QColor(200,20,20));
QColor color=QColor(Qt::darkRed);
color.setAlpha(90);
painter->setPen(color);
painter->setBrush(haloGradient);
painter->drawConvexPolygon( pts );
painter->setBrush(QColor(255,120,120));
painter->drawConvexPolygon( shadow );
painter->restore();
// draw needle hat
QLinearGradient linearGrad(QPointF(-7, -7), QPointF(14, 14));
linearGrad.setColorAt(0, Qt::white);
linearGrad.setColorAt(1, Qt::black);
painter->setPen(Qt::NoPen);
painter->setBrush(linearGrad);
painter->drawEllipse(-7, -7, 14, 14);
}
