first implementation of arc borders
This commit is contained in:
Uwe Rathmann
parent
9086c94715
commit
e937e3941f
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@ -41,7 +41,7 @@ namespace
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addItem( slider, 1, 0 );
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}
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{
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auto slider = new Slider( "Border", 0, 10, 1, arc->borderWidth() );
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auto slider = new Slider( "Border", 0, 50, 1, arc->borderWidth() );
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connect( slider, &Slider::valueChanged, arc, &ShadowedArc::setBorderWidth );
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addItem( slider, 1, 1);
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@ -59,7 +59,7 @@ namespace
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setThickness( 10.0 );
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setBorderWidth( 2.0 );
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setBorderColor( Qt::black );
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setBorderColor( QColor( 0, 0, 0, 150 ) );
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#if 0
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const QskGradientStops stops =
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@ -17,7 +17,7 @@
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#include <qpainterpath.h>
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// #define ARC_BORDER_NODE
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#define ARC_BORDER_NODE
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#ifdef ARC_BORDER_NODE
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using BorderNode = QskArcRenderNode;
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@ -47,15 +47,29 @@ namespace
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const auto cos = qFastCos( radians );
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const auto sin = qFastSin( radians );
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const auto x = m_cx + m_rx * cos;
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const auto y = m_cy - m_ry * sin;
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const auto v = normalVector( cos, sin ) * m_l2;
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line.setLine( x + v.x(), y - v.y(), x - v.x(), y + v.y(), color );
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}
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inline QPointF normalVector( const qreal radians ) const
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{
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return normalVector( qFastCos( radians ), qFastSin( radians ) );
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}
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inline QPointF normalVector( const qreal cos, const qreal sin ) const
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{
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/*
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The inner/outer points are found by shifting orthogonally along the
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ellipse tangent:
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m = w / h * tan( angle )
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y = m * x;
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x² + y² = dt
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x² + y² = 1.0
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=> x = dt / sqrt( 1.0 + m² );
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=> x = 1.0 / sqrt( 1.0 + m² );
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Note: the angle of the orthogonal vector could
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also be found ( first quadrant ) by:
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@ -63,26 +77,32 @@ namespace
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atan2( tan( angle ), h / w );
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*/
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qreal dx, dy;
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if ( qFuzzyIsNull( cos ) )
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{
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dx = 0.0;
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dy = ( sin > 0.0 ) ? m_l2 : -m_l2;
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}
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else
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{
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const qreal m = m_aspectRatio * ( sin / cos );
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const qreal t = m_l2 / qSqrt( 1.0 + m * m );
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return { 0.0, ( sin > 0.0 ) ? 1.0 : -1.0 };
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dx = ( cos >= 0.0 ) ? t : -t;
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dy = m * dx;
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const qreal m = m_aspectRatio * ( sin / cos );
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const qreal t = 1.0 / qSqrt( 1.0 + m * m );
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const auto dx = ( cos >= 0.0 ) ? t : -t;
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return { dx, m * dx };
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}
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inline void setBorderLines( const qreal radians, qreal border,
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const QskVertex::Color color, QskVertex::ColoredLine& outer,
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QskVertex::ColoredLine& inner ) const
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{
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const auto cos = qFastCos( radians );
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const auto sin = qFastSin( radians );
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const auto x = m_cx + m_rx * cos;
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const auto y = m_cy - m_ry * sin;
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const auto v = normalVector( cos, sin );
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line.setLine( x + dx, y - dy, x - dx, y + dy, color );
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const auto v1 = v * m_l2;
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const auto v2 = v * ( m_l2 - border );
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outer.setLine( x + v1.x(), y - v1.y(), x + v2.x(), y - v2.y(), color );
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inner.setLine( x - v1.x(), y + v1.y(), x - v2.x(), y + v2.y(), color );
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}
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const qreal m_l2; // half of the length
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@ -136,52 +156,23 @@ namespace
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const qreal m_cx;
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const qreal m_cy;
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};
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}
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class ArcStroker
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namespace
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{
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class StrokerBase
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{
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public:
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ArcStroker( const QRectF&, const QskArcMetrics&, bool radial, const QskGradient& );
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int fillCount() const;
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int borderCount() const;
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int setBorderLines( QskVertex::ColoredLine*, const QskVertex::Color ) const;
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int setFillLines( int length, QskVertex::ColoredLine* ) const;
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private:
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int arcLineCount() const;
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qreal radiansAt( qreal progress ) const;
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template< class LineStroker >
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int renderFillLines( const LineStroker&, QskVertex::ColoredLine* ) const;
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// radius
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const QRectF& m_rect;
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const qreal m_radians1;
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const qreal m_radians2;
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const bool m_radial; // for circular arcs radial/orthogonal does not differ
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const QskGradient& m_gradient;
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};
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ArcStroker::ArcStroker( const QRectF& rect,
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const QskArcMetrics& metrics, bool radial, const QskGradient& gradient )
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protected:
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StrokerBase( const QRectF& rect, const QskArcMetrics& metrics, bool radial )
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: m_rect( rect )
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, m_radians1( qDegreesToRadians( metrics.startAngle() ) )
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, m_radians2( qDegreesToRadians( metrics.endAngle() ) )
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, m_radial( qFuzzyCompare( rect.width(), rect.height() ) ? true : radial )
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, m_gradient( gradient )
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, m_closed( metrics.isClosed() )
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{
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}
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int ArcStroker::fillCount() const
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{
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return arcLineCount() + m_gradient.stepCount() - 1;
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}
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int ArcStroker::arcLineCount() const
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int arcLineCount() const
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{
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// not very sophisticated - TODO ...
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@ -192,37 +183,68 @@ namespace
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return qBound( 3, count, 160 );
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}
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int ArcStroker::borderCount() const
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inline qreal radiansAt( qreal progress ) const
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{
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return 0;
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return m_radians1 + progress * ( m_radians2 - m_radians1 );
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}
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int ArcStroker::setBorderLines( QskVertex::ColoredLine* lines,
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const QskVertex::Color color ) const
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{
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Q_UNUSED( lines );
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Q_UNUSED( color );
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const QRectF& m_rect;
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return 0;
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const qreal m_radians1;
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const qreal m_radians2;
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const bool m_radial; // for circular arcs radial/orthogonal does not differ
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const bool m_closed;
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};
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}
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namespace
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{
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class FillStroker : private StrokerBase
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{
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public:
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FillStroker( const QRectF&, const QskArcMetrics&,
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bool radial, const QskGradient& );
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int lineCount() const;
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int setLines( qreal length, QskVertex::ColoredLine* ) const;
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private:
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template< class LineStroker >
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int renderLines( const LineStroker&, QskVertex::ColoredLine* ) const;
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const QskGradient& m_gradient;
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};
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FillStroker::FillStroker( const QRectF& rect,
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const QskArcMetrics& metrics, bool radial, const QskGradient& gradient )
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: StrokerBase( rect, metrics, radial )
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, m_gradient( gradient )
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{
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}
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inline int ArcStroker::setFillLines(
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const int length, QskVertex::ColoredLine* lines ) const
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int FillStroker::lineCount() const
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{
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return arcLineCount() + m_gradient.stepCount() - 1;
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}
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inline int FillStroker::setLines(
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const qreal length, QskVertex::ColoredLine* lines ) const
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{
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if ( m_radial )
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{
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const RadialStroker lineStroker( m_rect, length );
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return renderFillLines( lineStroker, lines );
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return renderLines( lineStroker, lines );
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}
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else
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{
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const OrthogonalStroker lineStroker( m_rect, length );
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return renderFillLines( lineStroker, lines );
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return renderLines( lineStroker, lines );
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}
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}
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template< class LineStroker >
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inline int ArcStroker::renderFillLines(
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inline int FillStroker::renderLines(
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const LineStroker& stroker, QskVertex::ColoredLine* lines ) const
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{
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auto l = lines;
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@ -259,10 +281,86 @@ namespace
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return l - lines;
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}
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}
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inline qreal ArcStroker::radiansAt( qreal progress ) const
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namespace
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{
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class BorderStroker : StrokerBase
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{
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return m_radians1 + progress * ( m_radians2 - m_radians1 );
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public:
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BorderStroker( const QRectF&, const QskArcMetrics&,
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bool radial, const QColor& color );
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int lineCount() const;
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int setLines( qreal length, qreal border, QskVertex::ColoredLine* ) const;
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private:
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void setClosingLines( const QSGGeometry::ColoredPoint2D&,
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QskVertex::ColoredLine* ) const;
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const QskVertex::Color m_color;
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};
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BorderStroker::BorderStroker( const QRectF& rect,
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const QskArcMetrics& metrics, bool radial, const QColor& color )
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: StrokerBase( rect, metrics, radial )
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, m_color( color )
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{
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}
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int BorderStroker::lineCount() const
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{
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auto count = 2 * arcLineCount();
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if ( !m_closed )
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count += 2 * 3;
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return count;
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}
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int BorderStroker::setLines( qreal length, qreal border,
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QskVertex::ColoredLine* lines ) const
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{
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const auto count = arcLineCount();
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const qreal stepMax = count - 1;
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const auto stepSize = ( m_radians2 - m_radians1 ) / stepMax;
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auto outer = lines;
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if ( !m_closed )
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outer += 3;
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auto inner = outer + count;
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if ( !m_closed )
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inner += 3;
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OrthogonalStroker stroker( m_rect, length );
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for ( int i = 0; i < count; i++ )
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{
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stroker.setBorderLines( m_radians1 + i * stepSize,
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border, m_color, outer[i], inner[count - 1 - i] );
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}
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if ( !m_closed )
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{
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setClosingLines( inner[count - 1].p1, outer );
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setClosingLines( outer[count - 1].p1, inner );
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}
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return 2 * ( count + ( m_closed ? 0 : 3 ) );
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}
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void BorderStroker::setClosingLines( const QSGGeometry::ColoredPoint2D& pos,
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QskVertex::ColoredLine* lines ) const
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{
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const auto& l0 = lines[0];
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const auto sign = ( m_radians1 <= m_radians2 ) ? 1.0 : -1.0;
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const auto dx = sign * l0.dy();
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const auto dy = sign * l0.dx();
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lines[-3].setLine( pos.x, pos.y, pos.x, pos.y, m_color );
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lines[-2].setLine( pos.x + dx, pos.y - dy, pos.x, pos.y, m_color );
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lines[-1].setLine( l0.x1() + dx, l0.y1() - dy, l0.x1(), l0.y1(), m_color );
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}
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}
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@ -283,15 +381,15 @@ void QskArcRenderer::renderFillGeometry( const QRectF& rect,
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const auto b2 = 0.5 * borderWidth;
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const auto r = rect.adjusted( b2, b2, -b2, -b2 );
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ArcStroker stroker( r, metrics, radial, gradient );
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FillStroker stroker( r, metrics, radial, gradient );
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const auto lineCount = stroker.fillCount();
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const auto lineCount = stroker.lineCount();
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const auto lines = qskAllocateColoredLines( geometry, lineCount );
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if ( lines == nullptr )
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return;
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const auto effectiveCount = stroker.setFillLines(
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const auto effectiveCount = stroker.setLines(
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metrics.thickness() - borderWidth, lines );
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if ( effectiveCount > lineCount )
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@ -315,22 +413,24 @@ void QskArcRenderer::renderFillGeometry( const QRectF& rect,
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void QskArcRenderer::renderBorder( const QRectF& rect, const QskArcMetrics& metrics,
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bool radial, qreal borderWidth, const QColor& borderColor, QSGGeometry& geometry )
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{
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Q_UNUSED( borderWidth );
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Q_UNUSED( radial );
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Q_ASSERT( borderWidth > 0.0 );
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geometry.setDrawingMode( QSGGeometry::DrawTriangleStrip );
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ArcStroker stroker( rect, metrics, radial, QskGradient() );
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BorderStroker stroker( rect, metrics, radial, borderColor );
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const auto lineCount = stroker.borderCount();
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const auto lineCount = stroker.lineCount();
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const auto lines = qskAllocateColoredLines( geometry, lineCount );
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if ( lines )
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{
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const auto effectiveCount = stroker.setBorderLines( lines, borderColor );
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const auto effectiveCount = stroker.setLines(
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metrics.thickness(), borderWidth, lines );
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if ( lineCount != effectiveCount )
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{
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qWarning() << lineCount << effectiveCount;
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qFatal( "geometry: allocated memory does not match: %d vs. %d",
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effectiveCount, lineCount );
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}
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}
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}
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@ -133,6 +133,15 @@ namespace QskVertex
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setLine( x1, y1, x2, y2 );
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}
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inline float x1() const noexcept { return p1.x; }
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inline float y1() const noexcept { return p1.y; }
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inline float x2() const noexcept { return p2.x; }
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inline float y2() const noexcept { return p2.y; }
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inline float dx() const noexcept { return p2.x - p1.x; }
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inline float dy() const noexcept { return p2.y - p1.y; }
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QSGGeometry::Point2D p1;
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QSGGeometry::Point2D p2;
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};
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@ -172,6 +181,15 @@ namespace QskVertex
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setLine( x, y1, color, x, y2, color );
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}
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inline float x1() const noexcept { return p1.x; }
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inline float y1() const noexcept { return p1.y; }
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inline float x2() const noexcept { return p2.x; }
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inline float y2() const noexcept { return p2.y; }
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inline float dx() const noexcept { return p2.x - p1.x; }
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inline float dy() const noexcept { return p2.y - p1.y; }
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QSGGeometry::ColoredPoint2D p1;
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QSGGeometry::ColoredPoint2D p2;
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};
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