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Gerber plotter: ensure the gerber region for a round rect pad is always closed. 

Due to rounding issues, sometimes (especially for rotated pads)
the region (4 segments+4 arcs) was incorrectly closed
1 unit (nanometer) mismatch between start point and end point.
Although it does not create bad shape, its breaks the round rect pad
identification in CAM tools. start point and end point are now the same.

From master.
This commit is contained in:
jean-pierre charras 2020-06-12 10:22:19 +02:00
parent c027e72439
commit 56a17b4e68
1 changed files with 27 additions and 5 deletions
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26
common/plotters/GERBER_plotter.cpp
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@ -988,6 +988,9 @@ void GERBER_PLOTTER::plotRoundRectAsRegion( const wxPoint& aRectCenter, const wx
rr_outline.push_back( curr_edge );
// Move relative coordinates to the actual location and rotation:
wxPoint arc_last_center;
int arc_last_angle = curr_edge.m_arc_angle_start+arc_angle;
for( RR_EDGE& rr_edge: rr_outline )
{
RotatePoint( &rr_edge.m_start, aOrient );
@ -996,18 +999,37 @@ void GERBER_PLOTTER::plotRoundRectAsRegion( const wxPoint& aRectCenter, const wx
rr_edge.m_start += aRectCenter;
rr_edge.m_end += aRectCenter;
rr_edge.m_center += aRectCenter;
arc_last_center = rr_edge.m_center;
}
// Ensure the region is a closed polygon, i.e. the end point of last segment
// (end of arc) is the same as the first point. Rounding issues can create a
// small difference, mainly for rotated pads.
// calculate last point (end of last arc):
wxPoint last_pt;
last_pt.x = arc_last_center.x + KiROUND( cosdecideg( aCornerRadius, arc_last_angle ) );
last_pt.y = arc_last_center.y - KiROUND( sindecideg( aCornerRadius, arc_last_angle ) );
wxPoint first_pt = rr_outline[0].m_start;
#if 0 // For test only:
if( last_pt != first_pt )
wxLogMessage( "first pt %d %d last pt %d %d",
first_pt.x, first_pt.y, last_pt.x, last_pt.y );
#endif
fputs( "G36*\n", outputFile ); // Start region
fputs( "G01*\n", outputFile ); // Set linear interpolation.
MoveTo( rr_outline[0].m_start ); // Start point of region
first_pt = last_pt;
MoveTo( first_pt ); // Start point of region, must be same as end point
for( RR_EDGE& rr_edge: rr_outline )
{
if( aCornerRadius ) // Guard: ensure we do not create arcs with radius = 0
{
// LineTo( rr_edge.m_end ); // made in plotArc()
plotArc( rr_edge.m_center, rr_edge.m_arc_angle_start, rr_edge.m_arc_angle_start+arc_angle,
plotArc( rr_edge.m_center,
rr_edge.m_arc_angle_start, rr_edge.m_arc_angle_start+arc_angle,
aCornerRadius, true );
}
else