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Opengl DrawArcSegment(): refinements for a better look of control points. 

Use a segment count multiple of 2, because we have a control point on the
middle of the arc, and the look is better if it is on a segment junction
because there is no arc to segment approx error
This commit is contained in:
jean-pierre charras 2020-10-24 17:26:44 +02:00
parent 6d12a0c95b
commit cc81d97f78
1 changed files with 12 additions and 1 deletions
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13
common/gal/opengl/opengl_gal.cpp
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@ -842,7 +842,18 @@ void OPENGL_GAL::DrawArcSegment( const VECTOR2D& aCenterPoint, double aRadius, d
SWAP( aStartAngle, >, aEndAngle );
// Bigger arcs need smaller alpha increment to make them look smooth
const double alphaIncrement = std::min( 1e6 / aRadius, 2.0 * M_PI / CIRCLE_POINTS );
double alphaIncrement = std::min( 1e6 / aRadius, 2.0 * M_PI / CIRCLE_POINTS );
// Refinement: Use a segment count multiple of 2, because we have a control point
// on the middle of the arc, and the look is better if it is on a segment junction
// because there is no approx error
int seg_count = KiROUND( (aEndAngle -aStartAngle ) / alphaIncrement );
if( seg_count %2 != 0 )
seg_count += 1;
// Recalculate alphaIncrement with a even integer number of segment
alphaIncrement = (aEndAngle -aStartAngle ) / seg_count;
// Code disabled because it creates serious issues:
// - The arc is inside the polygonization error, but the interior of arc is also important