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Faster polylines drawing using OpenGL backend. 

Fixed drawing of lines' caps.
This commit is contained in:
Maciej Suminski 2013-07-01 15:23:43 +02:00
parent 4360860bee
commit 9e4fe8b410
1 changed files with 13 additions and 2 deletions
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15
common/gal/opengl/opengl_gal.cpp
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@ -714,7 +714,7 @@ void OPENGL_GAL::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoin
// Line caps
drawFilledSemiCircle( aStartPoint, lineWidth / 2, lineAngle + M_PI / 2 );
drawFilledSemiCircle( aEndPoint, lineWidth / 2, lineAngle + M_PI / 2 );
drawFilledSemiCircle( aEndPoint, lineWidth / 2, lineAngle - M_PI / 2 );
}
@ -725,8 +725,19 @@ void OPENGL_GAL::DrawPolyline( std::deque<VECTOR2D>& aPointList )
// Start from the second point
for( it++; it != aPointList.end(); it++ )
{
DrawLine( *( it - 1 ), *it );
const VECTOR2D startEndVector = ( *it - *( it - 1 ) );
double lineAngle = startEndVector.Angle();
drawLineQuad( *( it - 1 ), *it );
// There is no need to draw line caps on both ends of polyline's segments
drawFilledSemiCircle( *( it - 1 ), lineWidth / 2, lineAngle + M_PI / 2 );
}
// ..and now - draw the ending cap
const VECTOR2D startEndVector = ( *( it - 1 ) - *( it - 2 ) );
double lineAngle = startEndVector.Angle();
drawFilledSemiCircle( *( it - 1 ), lineWidth / 2, lineAngle - M_PI / 2 );
}