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alternative implemenation showing using a different type of gradient

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This commit is contained in:
Uwe Rathmann 2021-08-06 14:23:52 +02:00
parent 89ceca4fb4
commit 304e89da8a
1 changed files with 30 additions and 5 deletions
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35
examples/iotdashboard/CircularProgressBar.cpp
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@ -64,18 +64,20 @@ void CircularProgressBar::setRingGradient( const QRadialGradient& gradient )
void CircularProgressBar::paint( QPainter* painter ) void CircularProgressBar::paint( QPainter* painter )
{ {
auto size = contentsSize(); const auto size = contentsSize();
QRectF outerRect( {0, 0}, size );
const int startAngle = 1440;
const int endAngle = -16 * ( m_progress / 100.0 ) * 360;
painter->setRenderHint( QPainter::Antialiasing, true ); painter->setRenderHint( QPainter::Antialiasing, true );
#if 1
QRectF outerRect( {0, 0}, size );
painter->setBrush( m_ringGradient ); painter->setBrush( m_ringGradient );
painter->setPen( m_backgroundColor ); painter->setPen( m_backgroundColor );
painter->drawEllipse( outerRect ); painter->drawEllipse( outerRect );
int startAngle = 1440;
int endAngle = -16 * ( m_progress / 100.0 ) * 360;
painter->setBrush( m_gradient ); painter->setBrush( m_gradient );
painter->drawPie( outerRect, startAngle, endAngle ); painter->drawPie( outerRect, startAngle, endAngle );
@ -83,4 +85,27 @@ void CircularProgressBar::paint( QPainter* painter )
painter->setPen( m_backgroundColor ); painter->setPen( m_backgroundColor );
QRectF innerRect( width() / 2, width() / 2, size.width() - width(), size.height() - width() ); QRectF innerRect( width() / 2, width() / 2, size.width() - width(), size.height() - width() );
painter->drawEllipse( innerRect ); painter->drawEllipse( innerRect );
#else
const qreal w = 10;
const QRectF r( 0.5 * w, 0.5 * w, size.width() - w, size.height() - w );
const QColor c0 ( Qt::lightGray );
QRadialGradient g1( r.center(), qMin( r.width(), r.height() ) );
g1.setColorAt( 0.0, c0 );
g1.setColorAt( 0.5, c0.lighter( 120 ) );
g1.setColorAt( 1.0, c0 );
painter->setPen( QPen( g1, w ) );
painter->drawArc( r, startAngle, 16 * 360 );
QConicalGradient g2( r.center(), 0 );
g2.setColorAt( 0.0, Qt::red );
g2.setColorAt( 0.5, Qt::blue );
g2.setColorAt( 1.0, Qt::red );
painter->setPen( QPen( g2, w ) );
painter->drawArc( r, startAngle, endAngle );
#endif
} }