/* * This program source code file is part of KiCad, a free EDA CAD application. * * Copyright (C) 2021 Jean-Pierre Charras, jp.charras at wanadoo.fr * Copyright (C) 2022 KiCad Developers, see AUTHORS.txt for contributors. * * 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 */ /* * Some calculations (mainly computeCurvedForRoundShape) are derived from * https://github.com/NilujePerchut/kicad_scripts/tree/master/teardrops */ #include #include #include #include #include #include "teardrop.h" #include #include #include #include #include void TRACK_BUFFER::AddTrack( PCB_TRACK* aTrack, int aLayer, int aNetcode ) { auto item = m_map_tracks.find( idxFromLayNet( aLayer, aNetcode ) ); std::vector* buffer; if( item == m_map_tracks.end() ) { buffer = new std::vector; m_map_tracks[idxFromLayNet( aLayer, aNetcode )] = buffer; } else { buffer = (*item).second; } buffer->push_back( aTrack ); } VIAPAD::VIAPAD( PCB_VIA* aVia ) : m_Parent( aVia ) { m_Pos = aVia->GetPosition(); m_Width = aVia->GetWidth(); m_Drill = aVia->GetDrillValue(); m_NetCode = aVia->GetNetCode(); m_IsRound = true; m_IsPad = false; } VIAPAD::VIAPAD( PAD* aPad ) : m_Parent( aPad ) { m_Pos = aPad->GetPosition(); m_Width = std::min( aPad->GetSize().x, aPad->GetSize().y ); m_Drill = std::min( aPad->GetDrillSizeX(), aPad->GetDrillSizeY() ); m_NetCode = aPad->GetNetCode(); m_IsRound = aPad->GetShape() == PAD_SHAPE::CIRCLE || ( aPad->GetShape() == PAD_SHAPE::OVAL && aPad->GetSize().x == aPad->GetSize().y ); m_IsPad = true; } VIAPAD::VIAPAD( PCB_TRACK* aTrack, ENDPOINT_T aEndPoint ) : m_Parent( aTrack ) { m_Pos = aEndPoint == ENDPOINT_START ? aTrack->GetStart() : aTrack->GetEnd(); m_Width =aTrack->GetWidth(); m_Drill = 0; m_NetCode = aTrack->GetNetCode(); m_IsRound = true; m_IsPad = false; } void TEARDROP_MANAGER::collectVias( std::vector< VIAPAD >& aList ) const { for( PCB_TRACK* item : m_board->Tracks() ) { if( item->Type() != PCB_VIA_T ) continue; aList.emplace_back( static_cast( item ) ); } } void TEARDROP_MANAGER::collectPadsCandidate( std::vector< VIAPAD >& aList, bool aDrilledViaPad, bool aRoundShapesOnly, bool aIncludeNotDrilled ) const { for( FOOTPRINT* fp : m_board->Footprints() ) { for( PAD* pad : fp->Pads() ) { if( !pad->IsOnCopperLayer() ) continue; if( pad->GetNetCode() <= 0 ) // Not connected, so a teardrop cannot be attached continue; if( pad->GetShape() == PAD_SHAPE::CUSTOM ) // A teardrop shape cannot be built continue; if( aRoundShapesOnly ) { bool round_shape = pad->GetShape() == PAD_SHAPE::CIRCLE || ( pad->GetShape() == PAD_SHAPE::OVAL && pad->GetSize().x == pad->GetSize().y ); if( !round_shape ) continue; } if( pad->HasHole() && !aDrilledViaPad ) continue; if( pad->HasHole() || aIncludeNotDrilled ) aList.emplace_back( pad ); } } } void TEARDROP_MANAGER::collectTeardrops( std::vector< ZONE* >& aList ) const { for( ZONE* zone : m_board->Zones() ) { if( zone->IsTeardropArea() ) aList.push_back( zone ); } } bool TEARDROP_MANAGER::isViaAndTrackInSameZone( VIAPAD& aViapad, PCB_TRACK* aTrack ) const { for( ZONE* zone: m_board->Zones() ) { // Skip teardrops if( zone->IsTeardropArea() ) continue; // Only consider zones on the same layer if( !zone->IsOnLayer( aTrack->GetLayer() ) ) continue; if( zone->GetNetCode() == aTrack->GetNetCode() ) { if( zone->Outline()->Contains( VECTOR2I( aViapad.m_Pos ) ) ) { // Ensure the pad (if it is a pad) can be connected by the zone if( aViapad.m_IsPad ) { PAD *pad = static_cast< PAD* >( aViapad.m_Parent ); if( zone->GetPadConnection() == ZONE_CONNECTION::NONE || pad->GetZoneConnection() == ZONE_CONNECTION::NONE ) { return false; } } return true; } } } return false; } PCB_TRACK* TEARDROP_MANAGER::findTouchingTrack( EDA_ITEM_FLAGS& aMatchType, PCB_TRACK* aTrackRef, const VECTOR2I& aEndPoint, TRACK_BUFFER& aTrackLookupList ) const { EDA_ITEM_FLAGS match = 0; // to return the end point EDA_ITEM_FLAGS: // 0, STARTPOINT, ENDPOINT int matches = 0; // Count of candidates: only 1 is acceptable PCB_TRACK* candidate = nullptr; // a reference to the track connected std::vector* currlist = aTrackLookupList.GetTrackList( aTrackRef->GetLayer(), aTrackRef->GetNetCode() ); for( PCB_TRACK* curr_track: *currlist ) { if( curr_track == aTrackRef ) continue; match = curr_track->IsPointOnEnds( aEndPoint, m_tolerance); if( match ) { // if faced with a Y junction, stop here matches++; if( matches > 1 ) { aMatchType = 0; return nullptr; } aMatchType = match; candidate = curr_track; } } return candidate; } /** * @return a vector unit length from aVector */ static VECTOR2D NormalizeVector( VECTOR2I aVector ) { VECTOR2D vect( aVector ); double norm = vect.EuclideanNorm(); return vect / norm; } /* * Compute the curve part points for teardrops connected to a round shape * The Bezier curve control points are optimized for a round pad/via shape, * and do not give a good curve shape for other pad shapes */ void TEARDROP_MANAGER::computeCurvedForRoundShape( TEARDROP_PARAMETERS* aCurrParams, std::vector& aPoly, int aTrackHalfWidth, VECTOR2D aTrackDir, VIAPAD& aViaPad, std::vector& pts ) const { // in pts: // A and B are points on the track ( pts[0] and pts[1] ) // C and E are points on the aViaPad ( pts[2] and pts[4] ) // D is the aViaPad centre ( pts[3] ) double Vpercent = aCurrParams->m_HeightRatio; int td_height = aViaPad.m_Width * Vpercent; // First, calculate a aVpercent equivalent to the td_height clamped by aTdMaxHeight // We cannot use the initial aVpercent because it gives bad shape with points // on aViaPad calculated for a clamped aViaPad size if( aCurrParams->m_TdMaxHeight > 0 && aCurrParams->m_TdMaxHeight < td_height ) Vpercent *= (double)aCurrParams->m_TdMaxHeight / td_height; int radius = aViaPad.m_Width / 2; double minVpercent = double( aTrackHalfWidth ) / radius; double weaken = (Vpercent - minVpercent) / ( 1 - minVpercent ) / radius; double biasBC = 0.5 * SEG( pts[1], pts[2] ).Length(); double biasAE = 0.5 * SEG( pts[4], pts[0] ).Length(); VECTOR2I vecC = (VECTOR2I)pts[2] - aViaPad.m_Pos; VECTOR2I tangentC = VECTOR2I( pts[2].x - vecC.y * biasBC * weaken, pts[2].y + vecC.x * biasBC * weaken ); VECTOR2I vecE = (VECTOR2I)pts[4] - aViaPad.m_Pos; VECTOR2I tangentE = VECTOR2I( pts[4].x + vecE.y * biasAE * weaken, pts[4].y - vecE.x * biasAE * weaken ); VECTOR2I tangentB = VECTOR2I( pts[1].x - aTrackDir.x * biasBC, pts[1].y - aTrackDir.y * biasBC ); VECTOR2I tangentA = VECTOR2I( pts[0].x - aTrackDir.x * biasAE, pts[0].y - aTrackDir.y * biasAE ); std::vector curve_pts; curve_pts.reserve( aCurrParams->m_CurveSegCount ); BEZIER_POLY( pts[1], tangentB, tangentC, pts[2] ).GetPoly( curve_pts, 0, aCurrParams->m_CurveSegCount ); for( VECTOR2I& corner: curve_pts ) aPoly.push_back( corner ); aPoly.push_back( pts[3] ); curve_pts.clear(); BEZIER_POLY( pts[4], tangentE, tangentA, pts[0] ).GetPoly( curve_pts, 0, aCurrParams->m_CurveSegCount ); for( VECTOR2I& corner: curve_pts ) aPoly.push_back( corner ); } /* * Compute the curve part points for teardrops connected to a rectangular/polygonal shape * The Bezier curve control points are not optimized for a special shape */ void TEARDROP_MANAGER::computeCurvedForRectShape( TEARDROP_PARAMETERS* aCurrParams, std::vector& aPoly, int aTdHeight, int aTrackHalfWidth, VIAPAD& aViaPad, std::vector& aPts ) const { // in aPts: // A and B are points on the track ( pts[0] and pts[1] ) // C and E are points on the aViaPad ( pts[2] and pts[4] ) // D is the aViaPad centre ( pts[3] ) // side1 is( aPts[1], aPts[2] ); from track to via VECTOR2I side1( aPts[2] - aPts[1] ); // vector from track to via // side2 is ( aPts[4], aPts[0] ); from via to track VECTOR2I side2( aPts[4] - aPts[0] ); // vector from track to via std::vector curve_pts; curve_pts.reserve( aCurrParams->m_CurveSegCount ); // Note: This side is from track to via VECTOR2I ctrl1 = ( aPts[1] + aPts[1] + aPts[2] ) / 3; VECTOR2I ctrl2 = ( aPts[1] + aPts[2] + aPts[2] ) / 3; // The control points must be moved toward the polygon inside, in order to give a curved shape // The move vector is perpendicular to the vertex (side 1 or side 2), and its // value is delta, depending on the sizes of via and track int delta = ( aTdHeight / 2 - aTrackHalfWidth ); delta /= 4; // A scaling factor giving a fine shape, defined from tests. // However for short sides, the value of delta must be reduced, depending // on the side length // We use here a max delta value = side_length/8, defined from tests int side_length = side1.EuclideanNorm(); int delta_effective = std::min( delta, side_length/8 ); // The move vector depend on the quadrant: it must be always defined to create a // curve with a direction toward the track EDA_ANGLE angle1( side1 ); int sign = std::abs( angle1 ) >= ANGLE_90 ? 1 : -1; VECTOR2I bias( 0, sign * delta_effective ); // Does not works well with the current algo, due to an initial bug. // but I (JPC) keep it here because probably it will gives a better shape // if the algo is refined. // RotatePoint( bias, angle1 ); ctrl1.x += bias.x; ctrl1.y += bias.y; ctrl2.x += bias.x; ctrl2.y += bias.y; BEZIER_POLY( aPts[1], ctrl1, ctrl2, aPts[2] ).GetPoly( curve_pts, 0, aCurrParams->m_CurveSegCount ); for( VECTOR2I& corner: curve_pts ) aPoly.push_back( corner ); aPoly.push_back( aPts[3] ); // Note: This side is from via to track curve_pts.clear(); ctrl1 = ( aPts[4] + aPts[4] + aPts[0] ) / 3; ctrl2 = ( aPts[4] + aPts[0] + aPts[0] ) / 3; side_length = side2.EuclideanNorm(); delta_effective = std::min( delta, side_length/8 ); EDA_ANGLE angle2( side2 ); sign = std::abs( angle2 ) <= ANGLE_90 ? 1 : -1; bias = VECTOR2I( 0, sign * delta_effective ); // Does not works well with the current algo // RotatePoint( bias, angle2 ); ctrl1.x += bias.x; ctrl1.y += bias.y; ctrl2.x += bias.x; ctrl2.y += bias.y; BEZIER_POLY( aPts[4], ctrl1, ctrl2, aPts[0] ).GetPoly( curve_pts, 0, aCurrParams->m_CurveSegCount ); for( VECTOR2I& corner: curve_pts ) aPoly.push_back( corner ); } bool TEARDROP_MANAGER::ComputePointsOnPadVia( TEARDROP_PARAMETERS* aCurrParams, PCB_TRACK* aTrack, VIAPAD& aViaPad, std::vector& aPts ) const { // Compute the 2 anchor points on pad/via of the teardrop shape PAD* pad = ( aViaPad.m_Parent->Type() == PCB_PAD_T ) ? static_cast(aViaPad.m_Parent) : nullptr; SHAPE_POLY_SET c_buffer; // aHeightRatio is the factor to calculate the aViaPad teardrop preferred height // teardrop height = aViaPad size * aHeightRatio (aHeightRatio <= 1.0) // For rectangular (and similar) shapes, the preferred_height is calculated from the min // dim of the rectangle = aViaPad.m_Width int preferred_height = aViaPad.m_Width * aCurrParams->m_HeightRatio; // force_clip_shape = true to force the via/pad polygon to be clipped to follow // constraints // Clipping is also needed for rectangular shapes, because the teardrop shape is // restricted to a polygonal area smaller than the pad area (the teardrop height // use the smaller value of X and Y sizes). bool force_clip_shape = aCurrParams->m_HeightRatio < 1.0; // To find the anchor points on via/pad shape, we build the polygonal shape, and clip the polygon // to the max size (preferred_height or m_TdMaxHeight) by a rectangle centered on the // axis of the expected teardrop shape. // (only reduce the size of polygonal shape does not give good anchor points) if( aViaPad.m_IsRound ) { TransformCircleToPolygon( c_buffer, aViaPad.m_Pos, aViaPad.m_Width/2 , ARC_LOW_DEF, ERROR_INSIDE, 16 ); } else // Only PADS can have a not round shape { wxCHECK( pad, false ); force_clip_shape = true; preferred_height = aViaPad.m_Width * aCurrParams->m_HeightRatio; pad->TransformShapeWithClearanceToPolygon( c_buffer, aTrack->GetLayer(), 0, ARC_LOW_DEF, ERROR_INSIDE ); } // Clip the pad/via shape to match the m_TdMaxHeight constraint, and for // not rounded pad, clip the shape at the aViaPad.m_Width, i.e. the value // of the smallest value between size.x and size.y values. if( force_clip_shape || ( aCurrParams->m_TdMaxHeight > 0 && aCurrParams->m_TdMaxHeight < preferred_height ) ) { int halfsize = std::min( aCurrParams->m_TdMaxHeight, preferred_height )/2; // teardrop_axis is the line from anchor point on the track and the end point // of the teardrop in the pad/via // this is the teardrop_axis of the teardrop shape to build VECTOR2I ref_on_track = ( aPts[0] + aPts[1] ) / 2; VECTOR2I teardrop_axis( aPts[3] - ref_on_track ); EDA_ANGLE orient( teardrop_axis ); int len = teardrop_axis.EuclideanNorm(); // Build the constraint polygon: a rectangle with // length = dist between the point on track and the pad/via pos // height = m_TdMaxHeight or aViaPad.m_Width SHAPE_POLY_SET clipping_rect; clipping_rect.NewOutline(); // Build a horizontal rect: it will be rotated later clipping_rect.Append( 0, - halfsize ); clipping_rect.Append( 0, halfsize ); clipping_rect.Append( len, halfsize ); clipping_rect.Append( len, - halfsize ); clipping_rect.Rotate( -orient ); clipping_rect.Move( ref_on_track ); // Clip the shape to the max allowed teadrop area c_buffer.BooleanIntersection( clipping_rect, SHAPE_POLY_SET::PM_FAST ); } /* in aPts: * A and B are points on the track ( aPts[0] and aPts[1] ) * C and E are points on the aViaPad ( aPts[2] and aPts[4] ) * D is midpoint behind the aViaPad centre ( aPts[3] ) */ SHAPE_LINE_CHAIN& padpoly = c_buffer.Outline(0); std::vector points = padpoly.CPoints(); std::vector initialPoints; initialPoints.push_back( aPts[0] ); initialPoints.push_back( aPts[1] ); for( const VECTOR2I& pt: points ) initialPoints.emplace_back( pt.x, pt.y ); std::vector hull; BuildConvexHull( hull, initialPoints ); // Search for end points of segments starting at aPts[0] or aPts[1] // In some cases, in convex hull, only one point (aPts[0] or aPts[1]) is still in list VECTOR2I PointC; VECTOR2I PointE; int found_start = -1; // 2 points (one start and one end) should be found int found_end = -1; VECTOR2I start = aPts[0]; VECTOR2I pend = aPts[1]; for( unsigned ii = 0, jj = 0; jj < hull.size(); ii++, jj++ ) { unsigned next = ii+ 1; if( next >= hull.size() ) next = 0; int prev = ii -1; if( prev < 0 ) prev = hull.size()-1; if( hull[ii] == start ) { // the previous or the next point is candidate: if( hull[next] != pend ) PointE = hull[next]; else PointE = hull[prev]; found_start = ii; } if( hull[ii] == pend ) { if( hull[next] != start ) PointC = hull[next]; else PointC = hull[prev]; found_end = ii; } } if( found_start < 0 ) // PointE was not initialized, because start point does not exit { int ii = found_end-1; if( ii < 0 ) ii = hull.size()-1; PointE = hull[ii]; } if( found_end < 0 ) // PointC was not initialized, because end point does not exit { int ii = found_start-1; if( ii < 0 ) ii = hull.size()-1; PointC = hull[ii]; } aPts[2] = PointC; aPts[4] = PointE; // Now we have to know if the choice aPts[2] = PointC is the best, or if // aPts[2] = PointE is better. // A criteria is to calculate the polygon area in these 2 cases, and choose the case // that gives the bigger area, because the segments starting at PointC and PointE // maximize their distance. SHAPE_LINE_CHAIN dummy1( aPts, true ); double area1 = dummy1.Area(); std::swap( aPts[2], aPts[4] ); SHAPE_LINE_CHAIN dummy2( aPts, true ); double area2 = dummy2.Area(); if( area1 > area2 ) // The first choice (without swapping) is the better. std::swap( aPts[2], aPts[4] ); return true; } bool TEARDROP_MANAGER::findAnchorPointsOnTrack( TEARDROP_PARAMETERS* aCurrParams, VECTOR2I& aStartPoint, VECTOR2I& aEndPoint, PCB_TRACK*& aTrack, VIAPAD& aViaPad, int* aEffectiveTeardropLen, bool aFollowTracks, TRACK_BUFFER& aTrackLookupList ) const { bool found = true; VECTOR2I start = aTrack->GetStart(); VECTOR2I end = aTrack->GetEnd(); int radius = aViaPad.m_Width / 2; // Requested length of the teardrop: int targetLength = aViaPad.m_Width * aCurrParams->m_LengthRatio; if( aCurrParams->m_TdMaxLen > 0 ) targetLength = std::min( aCurrParams->m_TdMaxLen, targetLength ); int actualTdLen; // The actual teardrop length, limited by the available track length // ensure that start is at the via/pad end if( SEG( end, aViaPad.m_Pos ).Length() < radius ) { std::swap( start, end ); } SHAPE_POLY_SET shapebuffer; if( aViaPad.m_IsRound ) { TransformCircleToPolygon( shapebuffer, aViaPad.m_Pos, radius, ARC_LOW_DEF, ERROR_INSIDE, 16 ); } else { PAD* pad = static_cast( aViaPad.m_Parent ); pad->TransformShapeWithClearanceToPolygon( shapebuffer, aTrack->GetLayer(), 0, ARC_LOW_DEF, ERROR_INSIDE ); } SHAPE_LINE_CHAIN& outline = shapebuffer.Outline(0); outline.SetClosed( true ); // Search the intersection point between the pad/via shape and the current track // This this the starting point to define the teardrop length SHAPE_LINE_CHAIN::INTERSECTIONS pts; int pt_count = outline.Intersect( SEG( start, end ), pts ); // Ensure a intersection point was found, otherwise we cannot built the teardrop // using this track if( pt_count < 1 ) return false; VECTOR2I intersect = pts[0].p; start.x = intersect.x; start.y = intersect.y; actualTdLen = std::min( targetLength, SEG( start, end ).Length() ); // If the first track is too short to allow a teardrop having the requested length // explore the connected track(s) if( actualTdLen < targetLength && aFollowTracks ) { int consumed = 0; while( actualTdLen+consumed < targetLength ) { EDA_ITEM_FLAGS matchType; PCB_TRACK* connected_track = findTouchingTrack( matchType, aTrack, end, aTrackLookupList ); if( connected_track == nullptr ) break; // TODO: stop if angle between old and new segment is > 45 deg to avoid bad shape consumed += actualTdLen; actualTdLen = std::min( targetLength-consumed, int( connected_track->GetLength() ) ); aTrack = connected_track; end = connected_track->GetEnd(); start = connected_track->GetStart(); if( matchType != STARTPOINT ) std::swap( start, end ); // If we do not want to explore more than one connected track, stop search here break; } } aStartPoint = start; aEndPoint = end; *aEffectiveTeardropLen = actualTdLen; return found; } bool TEARDROP_MANAGER::computeTeardropPolygonPoints( TEARDROP_PARAMETERS* aCurrParams, std::vector& aCorners, PCB_TRACK* aTrack, VIAPAD& aViaPad, bool aFollowTracks, TRACK_BUFFER& aTrackLookupList ) const { VECTOR2I start, end; // Start and end points of the track anchor of the teardrop // the start point is inside the teardrop shape // the end point is outside. int track_stub_len; // the dist between the start point and the anchor point // on the track // Note: aTrack can be modified if the initial track is too short if( !findAnchorPointsOnTrack( aCurrParams, start, end, aTrack, aViaPad, &track_stub_len, aFollowTracks, aTrackLookupList ) ) return false; VECTOR2D vecT = NormalizeVector(end - start); // find the 2 points on the track, sharp end of the teardrop int track_halfwidth = aTrack->GetWidth() / 2; VECTOR2I pointB = start + VECTOR2I( vecT.x * track_stub_len + vecT.y * track_halfwidth, vecT.y * track_stub_len - vecT.x * track_halfwidth ); VECTOR2I pointA = start + VECTOR2I( vecT.x * track_stub_len - vecT.y * track_halfwidth, vecT.y * track_stub_len + vecT.x * track_halfwidth ); // To build a polygonal valid shape pointA and point B must be outside the pad // It can be inside with some pad shapes having very different X and X sizes if( !aViaPad.m_IsRound ) { PAD* pad = static_cast( aViaPad.m_Parent ); if( pad->HitTest( pointA ) ) return false; if( pad->HitTest( pointB ) ) return false; } // Introduce a last point to cover the via centre to ensure it is seen as connected VECTOR2I pointD = aViaPad.m_Pos; // add a small offset in order to have the aViaPad.m_Pos reference point inside // the teardrop area, just in case... int offset = pcbIUScale.mmToIU( 0.001 ); pointD += VECTOR2I( int( -vecT.x*offset), int(-vecT.y*offset) ); VECTOR2I pointC, pointE; // Point on PADVIA outlines std::vector pts = {pointA, pointB, pointC, pointD, pointE}; ComputePointsOnPadVia( aCurrParams, aTrack, aViaPad, pts ); if( !aCurrParams->IsCurved() ) { aCorners = pts; return true; } // See if we can use curved teardrop shape if( aViaPad.m_IsRound ) { computeCurvedForRoundShape( aCurrParams, aCorners, track_halfwidth, vecT, aViaPad, pts ); } else { int td_height = aViaPad.m_Width * aCurrParams->m_HeightRatio; if( aCurrParams->m_TdMaxHeight > 0 && aCurrParams->m_TdMaxHeight < td_height ) td_height = aCurrParams->m_TdMaxHeight; computeCurvedForRectShape( aCurrParams, aCorners, td_height, track_halfwidth, aViaPad, pts ); } return true; }