kicad/pcbnew/zones_test_and_combine_area...

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/**
* @file zones_test_and_combine_areas.cpp
* @brief Functions to test, merge and cut polygons used as copper areas outlines
* some pieces of code come from FreePCB.
*/
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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2012 Jean-Pierre Charras, jean-pierre.charras@ujf-grenoble.fr
* Copyright (C) 1992-2012 KiCad Developers, see AUTHORS.txt for contributors.
*
* Some code comes from FreePCB.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <fctsys.h>
#include <class_board.h>
#include <class_zone.h>
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bool BOARD::OnAreaPolygonModified( PICKED_ITEMS_LIST* aModifiedZonesList,
ZONE_CONTAINER* modified_area )
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{
// clip polygon against itself
bool modified = NormalizeAreaPolygon( aModifiedZonesList, modified_area );
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// now see if we need to clip against other areas
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if( TestAreaIntersections( modified_area ) )
{
modified = true;
CombineAllAreasInNet( aModifiedZonesList, modified_area->GetNetCode(), true );
}
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// Test for bad areas: all zones must have more than 2 corners:
// Note: should not happen, but just in case.
for( ZONE_CONTAINER* zone : m_zones )
{
if( zone->GetNumCorners() < 3 )
RemoveArea( aModifiedZonesList, zone );
}
return modified;
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}
bool BOARD::CombineAllAreasInNet( PICKED_ITEMS_LIST* aDeletedList, int aNetCode,
bool aUseLocalFlags )
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{
if( m_zones.size() <= 1 )
return false;
bool modified = false;
// Loop through all combinations
for( unsigned ia1 = 0; ia1 < m_zones.size() - 1; ia1++ )
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{
ZONE_CONTAINER* curr_area = m_zones[ia1];
if( curr_area->GetNetCode() != aNetCode )
continue;
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// legal polygon
BOX2I b1 = curr_area->Outline()->BBox();
bool mod_ia1 = false;
for( unsigned ia2 = m_zones.size() - 1; ia2 > ia1; ia2-- )
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{
ZONE_CONTAINER* area2 = m_zones[ia2];
if( area2->GetNetCode() != aNetCode )
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continue;
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if( curr_area->GetPriority() != area2->GetPriority() )
continue;
if( curr_area->GetIsKeepout() != area2->GetIsKeepout() )
continue;
if( curr_area->GetLayerSet() != area2->GetLayerSet() )
continue;
BOX2I b2 = area2->Outline()->BBox();
if( b1.Intersects( b2 ) )
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{
// check area2 against curr_area
if( curr_area->GetLocalFlags() || area2->GetLocalFlags()
|| aUseLocalFlags == false )
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{
bool ret = TestAreaIntersection( curr_area, area2 );
if( ret )
ret = CombineAreas( aDeletedList, curr_area, area2 );
if( ret )
{
mod_ia1 = true;
modified = true;
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}
}
}
}
if( mod_ia1 )
ia1--; // if modified, we need to check it again
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}
return modified;
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}
bool BOARD::TestAreaIntersections( ZONE_CONTAINER* area_to_test )
{
for( ZONE_CONTAINER* area2 : m_zones)
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{
if( area_to_test->GetNetCode() != area2->GetNetCode() )
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continue;
if( area_to_test == area2 )
continue;
// see if areas are on same layers
if( area_to_test->GetLayerSet() != area2->GetLayerSet() )
continue;
// test for different priorities
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if( area_to_test->GetPriority() != area2->GetPriority() )
continue;
// test for different types
if( area_to_test->GetIsKeepout() != area2->GetIsKeepout() )
continue;
// Keepout area-specific tests
if( area_to_test->GetIsKeepout() )
{
if( area_to_test->GetDoNotAllowCopperPour() != area2->GetDoNotAllowCopperPour() )
continue;
if( area_to_test->GetDoNotAllowTracks() != area2->GetDoNotAllowTracks() )
continue;
if( area_to_test->GetDoNotAllowVias() != area2->GetDoNotAllowVias() )
continue;
if( area_to_test->GetDoNotAllowPads() != area2->GetDoNotAllowPads() )
continue;
if( area_to_test->GetDoNotAllowFootprints() != area2->GetDoNotAllowFootprints() )
continue;
}
// Filled zone specific tests
else
{
if( area_to_test->GetLocalClearance() != area2->GetLocalClearance() )
continue;
if( area_to_test->GetThermalReliefGap() != area2->GetThermalReliefGap() )
continue;
if( area_to_test->GetThermalReliefCopperBridge() != area2->GetThermalReliefCopperBridge() )
continue;
if( area_to_test->GetZoneClearance() != area2->GetZoneClearance() )
continue;
if( area_to_test->GetPadConnection() != area2->GetPadConnection() )
continue;
if( area_to_test->GetMinThickness() != area2->GetMinThickness() )
continue;
if( area_to_test->GetCornerSmoothingType() != area2->GetCornerSmoothingType() )
continue;
if( area_to_test->GetCornerRadius() != area2->GetCornerRadius() )
continue;
}
if( TestAreaIntersection( area_to_test, area2 ) )
return true;
}
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return false;
}
bool BOARD::TestAreaIntersection( ZONE_CONTAINER* area_ref, ZONE_CONTAINER* area_to_test )
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{
// see if areas are on same layer
if( area_ref->GetLayer() != area_to_test->GetLayer() )
return false;
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SHAPE_POLY_SET* poly1 = area_ref->Outline();
SHAPE_POLY_SET* poly2 = area_to_test->Outline();
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// test bounding rects
BOX2I b1 = poly1->BBox();
BOX2I b2 = poly2->BBox();
if( ! b1.Intersects( b2 ) )
return false;
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// Now test for intersecting segments
for( auto segIterator1 = poly1->IterateSegmentsWithHoles(); segIterator1; segIterator1++ )
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{
// Build segment
SEG firstSegment = *segIterator1;
for( auto segIterator2 = poly2->IterateSegmentsWithHoles(); segIterator2; segIterator2++ )
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{
// Build second segment
SEG secondSegment = *segIterator2;
// Check whether the two segments built collide
if( firstSegment.Collide( secondSegment, 0 ) )
return true;
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}
}
// If a contour is inside another contour, no segments intersects, but the zones
// can be combined if a corner is inside an outline (only one corner is enough)
for( auto iter = poly2->IterateWithHoles(); iter; iter++ )
{
if( poly1->Contains( *iter ) )
return true;
}
for( auto iter = poly1->IterateWithHoles(); iter; iter++ )
{
if( poly2->Contains( *iter ) )
return true;
}
return false;
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}
bool BOARD::CombineAreas( PICKED_ITEMS_LIST* aDeletedList, ZONE_CONTAINER* area_ref,
ZONE_CONTAINER* area_to_combine )
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{
if( area_ref == area_to_combine )
{
wxASSERT( 0 );
return false;
}
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SHAPE_POLY_SET mergedOutlines = *area_ref->Outline();
SHAPE_POLY_SET areaToMergePoly = *area_to_combine->Outline();
mergedOutlines.BooleanAdd( areaToMergePoly, SHAPE_POLY_SET::PM_FAST );
mergedOutlines.Simplify( SHAPE_POLY_SET::PM_FAST );
// We should have one polygon with hole
// We can have 2 polygons with hole, if the 2 initial polygons have only one common corner
// and therefore cannot be merged (they are dectected as intersecting)
// but we should never have more than 2 polys
if( mergedOutlines.OutlineCount() > 2 )
{
wxLogMessage( "BOARD::CombineAreas error: more than 2 polys after merging" );
return false;
}
if( mergedOutlines.OutlineCount() > 1 )
return false;
// Update the area with the new merged outline
delete area_ref->Outline();
area_ref->SetOutline( new SHAPE_POLY_SET( mergedOutlines ) );
RemoveArea( aDeletedList, area_to_combine );
area_ref->SetLocalFlags( 1 );
area_ref->HatchBorder();
return true;
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}