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SHAPE_ARC: fix polyline conversion when radius=0 

Prevent a divide-by-zero bug in SHAPE_ARC::ConvertToPolyline.

When the radius is zero, just use the initial angle (it makes
no different anyway, the result is the centre point, which is
the start point.

(cherry picked from commit e312e2b286)
This commit is contained in:
John Beard 2019-04-16 19:23:18 +01:00
parent 98f78f534c
commit ab39f06003
2 changed files with 6 additions and 6 deletions
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6
common/geometry/shape_arc.cpp
View File

@ -256,7 +256,11 @@ const SHAPE_LINE_CHAIN SHAPE_ARC::ConvertToPolyline( double aAccuracy ) const
for( int i = 0; i <= n ; i++ )
{
double a = sa + m_centralAngle * (double) i / (double) n;
double a = sa;
if( n != 0 )
sa += m_centralAngle * (double) i / (double) n;
double x = c.x + r * cos( a * M_PI / 180.0 );
double y = c.y + r * sin( a * M_PI / 180.0 );

6
qa/common/geometry/test_shape_arc.cpp
View File

@ -314,10 +314,8 @@ bool ArePolylinePointsNearCircle(
return GEOM_TEST::ArePointsNearCircle( points, aCentre, aRad, aTolEnds );
}
#ifdef HAVE_EXPECTED_FAILURES
// Failure in zero-radius case
BOOST_AUTO_TEST_CASE( ArcToPolyline, *boost::unit_test::expected_failures( 1 ) )
BOOST_AUTO_TEST_CASE( ArcToPolyline )
{
const std::vector<ARC_TO_POLYLINE_CASE> cases = {
{
@ -373,7 +371,5 @@ BOOST_AUTO_TEST_CASE( ArcToPolyline, *boost::unit_test::expected_failures( 1 ) )
}
}
#endif // HAVE_EXPECTED_FAILURES
BOOST_AUTO_TEST_SUITE_END()