kicad/eeschema/autoplace_fields.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2015 Chris Pavlina <pavlina.chris@gmail.com>
* Copyright (C) 2015, 2020-2021 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
*/
/******************************************************************************
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* Field autoplacer: Tries to find an optimal place for symbol fields, and places them there.
* There are two modes: "auto"-autoplace, and "manual" autoplace.
* Auto mode is for when the process is run automatically, like when rotating parts, and it
* avoids doing things that would be helpful for the final positioning but annoying if they
* happened without permission.
* Short description of the process:
*
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* 1. Compute the dimensions of the fields' bounding box ::computeFBoxSize
* 2. Determine which side the fields will go on. ::chooseSideForFields
* 1. Sort the four sides in preference order,
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* depending on the symbol's shape and
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* orientation ::getPreferredSides
* 2. If in manual mode, sift out the sides that would
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* cause fields to overlap other items ::getCollidingSides
* 3. If any remaining sides have zero pins there,
* choose the highest zero-pin side according to
* preference order.
* 4. If all sides have pins, choose the side with the
* fewest pins.
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* 3. Compute the position of the fields' bounding box ::fieldBoxPlacement
* 4. In manual mode, shift the box vertically if possible
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* to fit fields between adjacent wires ::fitFieldsBetweenWires
* 5. Move all fields to their final positions
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* 1. Re-justify fields if options allow that ::justifyField
* 2. Round to a 50-mil grid coordinate if desired
*/
#include <boost/range/adaptor/reversed.hpp>
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#include <sch_edit_frame.h>
#include <hotkeys_basic.h>
#include <sch_symbol.h>
#include <sch_line.h>
#include <lib_pin.h>
#include <sch_draw_panel.h>
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#include <kiface_base.h>
#include <vector>
#include <algorithm>
#include <tool/tool_manager.h>
#include <tools/ee_selection_tool.h>
#include <eeschema_settings.h>
#include <core/arraydim.h>
#define FIELD_PADDING Mils2iu( 10 ) // arbitrarily chosen for aesthetics
#define WIRE_V_SPACING Mils2iu( 100 )
#define HPADDING Mils2iu( 25 )
#define VPADDING Mils2iu( 25 )
/**
* Round up/down to the nearest multiple of n
*/
template<typename T> T round_n( const T& value, const T& n, bool aRoundUp )
{
if( value % n )
return n * (value / n + (aRoundUp ? 1 : 0));
else
return value;
}
/**
* Convert an integer to a horizontal justification; neg=L zero=C pos=R
*/
EDA_TEXT_HJUSTIFY_T TO_HJUSTIFY( int x )
{
return static_cast<EDA_TEXT_HJUSTIFY_T>( x );
}
class AUTOPLACER
{
public:
typedef wxPoint SIDE;
static const SIDE SIDE_TOP, SIDE_BOTTOM, SIDE_LEFT, SIDE_RIGHT;
enum COLLISION { COLLIDE_NONE, COLLIDE_OBJECTS, COLLIDE_H_WIRES };
struct SIDE_AND_NPINS
{
SIDE side;
unsigned pins;
};
struct SIDE_AND_COLL
{
SIDE side;
COLLISION collision;
};
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AUTOPLACER( SCH_SYMBOL* aSymbol, SCH_SCREEN* aScreen ) :
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m_screen( aScreen ),
m_symbol( aSymbol )
{
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m_symbol->GetFields( m_fields, /* aVisibleOnly */ true );
auto cfg = dynamic_cast<EESCHEMA_SETTINGS*>( Kiface().KifaceSettings() );
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wxASSERT( cfg );
m_allow_rejustify = false;
m_align_to_grid = true;
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if( cfg )
{
m_allow_rejustify = cfg->m_AutoplaceFields.allow_rejustify;
m_align_to_grid = cfg->m_AutoplaceFields.align_to_grid;
}
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m_symbol_bbox = m_symbol->GetBodyBoundingBox();
m_fbox_size = computeFBoxSize( /* aDynamic */ true );
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m_is_power_symbol = !m_symbol->IsInNetlist();
if( aScreen )
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getPossibleCollisions( m_colliders );
}
/**
* Do the actual autoplacement.
* @param aManual - if true, use extra heuristics for smarter placement when manually
* called up.
*/
void DoAutoplace( bool aManual )
{
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bool force_wire_spacing = false;
SIDE field_side = chooseSideForFields( aManual );
wxPoint fbox_pos = fieldBoxPlacement( field_side );
EDA_RECT field_box( fbox_pos, m_fbox_size );
if( aManual )
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force_wire_spacing = fitFieldsBetweenWires( &field_box, field_side );
// Move the fields
int last_y_coord = field_box.GetTop();
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for( unsigned field_idx = 0; field_idx < m_fields.size(); ++field_idx )
{
SCH_FIELD* field = m_fields[field_idx];
if( m_allow_rejustify )
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justifyField( field, field_side );
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wxPoint pos( fieldHorizPlacement( field, field_box ),
fieldVertPlacement( field, field_box, &last_y_coord, !force_wire_spacing ) );
if( m_align_to_grid )
{
if( abs( field_side.x ) > 0 )
pos.x = round_n( pos.x, Mils2iu( 50 ), field_side.x >= 0 );
if( abs( field_side.y ) > 0 )
pos.y = round_n( pos.y, Mils2iu( 50 ), field_side.y >= 0 );
}
field->SetPosition( pos );
}
}
protected:
/**
* Compute and return the size of the fields' bounding box.
* @param aDynamic - if true, use dynamic spacing
*/
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wxSize computeFBoxSize( bool aDynamic )
{
int max_field_width = 0;
int total_height = 0;
for( SCH_FIELD* field : m_fields )
{
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if( m_symbol->GetTransform().y1 )
field->SetTextAngle( TEXT_ANGLE_VERT );
else
field->SetTextAngle( TEXT_ANGLE_HORIZ );
EDA_RECT bbox = field->GetBoundingBox();
int field_width = bbox.GetWidth();
int field_height = bbox.GetHeight();
max_field_width = std::max( max_field_width, field_width );
// Remove interline spacing from field_height for last line.
if( field == m_fields[ m_fields.size() - 1 ] )
field_height *= 0.62;
if( !aDynamic )
total_height += WIRE_V_SPACING;
else if( m_align_to_grid )
total_height += round_n( field_height, Mils2iu( 50 ), true );
else
total_height += field_height + FIELD_PADDING;
}
return wxSize( max_field_width, total_height );
}
/**
* Return the side that a pin is on.
*/
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SIDE getPinSide( SCH_PIN* aPin )
{
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int pin_orient = aPin->GetLibPin()->PinDrawOrient( m_symbol->GetTransform() );
switch( pin_orient )
{
case PIN_RIGHT: return SIDE_LEFT;
case PIN_LEFT: return SIDE_RIGHT;
case PIN_UP: return SIDE_BOTTOM;
case PIN_DOWN: return SIDE_TOP;
default:
wxFAIL_MSG( "Invalid pin orientation" );
return SIDE_LEFT;
}
}
/**
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* Count the number of pins on a side of the symbol.
*/
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unsigned pinsOnSide( SIDE aSide )
{
unsigned pin_count = 0;
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for( SCH_PIN* each_pin : m_symbol->GetPins() )
{
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if( !each_pin->IsVisible() && !m_is_power_symbol )
continue;
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if( getPinSide( each_pin ) == aSide )
++pin_count;
}
return pin_count;
}
/**
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* Populate a list of all drawing items that *may* collide with the fields. That is, all
* drawing items, including other fields, that are not the current symbol or its own fields.
*/
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void getPossibleCollisions( std::vector<SCH_ITEM*>& aItems )
{
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wxCHECK_RET( m_screen, "getPossibleCollisions() with null m_screen" );
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for( SCH_ITEM* item : m_screen->Items().Overlapping( m_symbol->GetBoundingBox() ) )
{
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if( SCH_SYMBOL* candidate = dynamic_cast<SCH_SYMBOL*>( item ) )
{
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if( candidate == m_symbol )
continue;
std::vector<SCH_FIELD*> fields;
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candidate->GetFields( fields, /* aVisibleOnly */ true );
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for( SCH_FIELD* field : fields )
aItems.push_back( field );
}
aItems.push_back( item );
}
}
/**
* Filter a list of possible colliders to include only those that actually collide
* with a given rectangle. Returns the new vector.
*/
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std::vector<SCH_ITEM*> filterCollisions( const EDA_RECT& aRect )
{
std::vector<SCH_ITEM*> filtered;
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for( SCH_ITEM* item : m_colliders )
{
EDA_RECT item_box;
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if( SCH_SYMBOL* item_comp = dynamic_cast<SCH_SYMBOL*>( item ) )
item_box = item_comp->GetBodyBoundingBox();
else
item_box = item->GetBoundingBox();
if( item_box.Intersects( aRect ) )
filtered.push_back( item );
}
return filtered;
}
/**
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* Return a list with the preferred field sides for the symbol, in decreasing order of
* preference.
*/
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std::vector<SIDE_AND_NPINS> getPreferredSides()
{
SIDE_AND_NPINS sides_init[] = {
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{ SIDE_RIGHT, pinsOnSide( SIDE_RIGHT ) },
{ SIDE_TOP, pinsOnSide( SIDE_TOP ) },
{ SIDE_LEFT, pinsOnSide( SIDE_LEFT ) },
{ SIDE_BOTTOM, pinsOnSide( SIDE_BOTTOM ) },
};
std::vector<SIDE_AND_NPINS> sides( sides_init, sides_init + arrayDim( sides_init ) );
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int orient = m_symbol->GetOrientation();
int orient_angle = orient & 0xff; // enum is a bitmask
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bool h_mirrored = ( ( orient & SYM_MIRROR_X )
&& ( orient_angle == SYM_ORIENT_0 || orient_angle == SYM_ORIENT_180 ) );
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double w = double( m_symbol_bbox.GetWidth() );
double h = double( m_symbol_bbox.GetHeight() );
// The preferred-sides heuristics are a bit magical. These were determined mostly
// by trial and error.
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if( m_is_power_symbol )
{
// For power symbols, we generally want the label at the top first.
switch( orient_angle )
{
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case SYM_ORIENT_0:
std::swap( sides[0], sides[1] );
std::swap( sides[1], sides[3] );
// TOP, BOTTOM, RIGHT, LEFT
break;
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case SYM_ORIENT_90:
std::swap( sides[0], sides[2] );
std::swap( sides[1], sides[2] );
// LEFT, RIGHT, TOP, BOTTOM
break;
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case SYM_ORIENT_180:
std::swap( sides[0], sides[3] );
// BOTTOM, TOP, LEFT, RIGHT
break;
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case SYM_ORIENT_270:
std::swap( sides[1], sides[2] );
// RIGHT, LEFT, TOP, BOTTOM
break;
}
}
else
{
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// If the symbol is horizontally mirrored, swap left and right
if( h_mirrored )
{
std::swap( sides[0], sides[2] );
}
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// If the symbol is very long or is a power symbol, swap H and V
if( w/h > 3.0 )
{
std::swap( sides[0], sides[1] );
std::swap( sides[1], sides[3] );
}
}
return sides;
}
/**
* Return a list of the sides where a field set would collide with another item.
*/
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std::vector<SIDE_AND_COLL> getCollidingSides()
{
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SIDE sides_init[] = { SIDE_RIGHT, SIDE_TOP, SIDE_LEFT, SIDE_BOTTOM };
std::vector<SIDE> sides( sides_init, sides_init + arrayDim( sides_init ) );
std::vector<SIDE_AND_COLL> colliding;
// Iterate over all sides and find the ones that collide
for( SIDE side : sides )
{
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EDA_RECT box( fieldBoxPlacement( side ), m_fbox_size );
COLLISION collision = COLLIDE_NONE;
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for( SCH_ITEM* collider : filterCollisions( box ) )
{
SCH_LINE* line = dynamic_cast<SCH_LINE*>( collider );
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if( line && !side.x )
{
wxPoint start = line->GetStartPoint(), end = line->GetEndPoint();
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if( start.y == end.y && collision != COLLIDE_OBJECTS )
collision = COLLIDE_H_WIRES;
else
collision = COLLIDE_OBJECTS;
}
else
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{
collision = COLLIDE_OBJECTS;
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}
}
if( collision != COLLIDE_NONE )
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colliding.push_back( { side, collision } );
}
return colliding;
}
/**
* Choose a side for the fields, filtered on only one side collision type.
* Removes the sides matching the filter from the list.
*/
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SIDE_AND_NPINS chooseSideFiltered( std::vector<SIDE_AND_NPINS>& aSides,
const std::vector<SIDE_AND_COLL>& aCollidingSides,
COLLISION aCollision,
SIDE_AND_NPINS aLastSelection)
{
SIDE_AND_NPINS sel = aLastSelection;
std::vector<SIDE_AND_NPINS>::iterator it = aSides.begin();
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while( it != aSides.end() )
{
bool collide = false;
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for( SIDE_AND_COLL collision : aCollidingSides )
{
if( collision.side == it->side && collision.collision == aCollision )
collide = true;
}
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if( !collide )
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{
++it;
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}
else
{
if( it->pins <= sel.pins )
{
sel.pins = it->pins;
sel.side = it->side;
}
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it = aSides.erase( it );
}
}
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return sel;
}
/**
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* Look where a symbol's pins are to pick a side to put the fields on
* @param aAvoidCollisions - if true, pick last the sides where the label will collide
* with other items.
*/
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SIDE chooseSideForFields( bool aAvoidCollisions )
{
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std::vector<SIDE_AND_NPINS> sides = getPreferredSides();
std::reverse( sides.begin(), sides.end() );
SIDE_AND_NPINS side = { wxPoint( 1, 0 ), UINT_MAX };
if( aAvoidCollisions )
{
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std::vector<SIDE_AND_COLL> colliding_sides = getCollidingSides();
side = chooseSideFiltered( sides, colliding_sides, COLLIDE_OBJECTS, side );
side = chooseSideFiltered( sides, colliding_sides, COLLIDE_H_WIRES, side );
}
for( SIDE_AND_NPINS& each_side : sides | boost::adaptors::reversed )
{
if( !each_side.pins ) return each_side.side;
}
for( SIDE_AND_NPINS& each_side : sides )
{
if( each_side.pins <= side.pins )
{
side.pins = each_side.pins;
side.side = each_side.side;
}
}
return side.side;
}
/**
* Set the justification of a field based on the side it's supposed to be on, taking
* into account whether the field will be displayed with flipped justification due to
* mirroring.
*/
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void justifyField( SCH_FIELD* aField, SIDE aFieldSide )
{
// Justification is set twice to allow IsHorizJustifyFlipped() to work correctly.
aField->SetHorizJustify( TO_HJUSTIFY( -aFieldSide.x ) );
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aField->SetHorizJustify( TO_HJUSTIFY( -aFieldSide.x
* ( aField->IsHorizJustifyFlipped() ? -1 : 1 ) ) );
aField->SetVertJustify( GR_TEXT_VJUSTIFY_CENTER );
}
/**
* Return the position of the field bounding box.
*/
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wxPoint fieldBoxPlacement( SIDE aFieldSide )
{
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wxPoint fbox_center = m_symbol_bbox.Centre();
int offs_x = ( m_symbol_bbox.GetWidth() + m_fbox_size.GetWidth() ) / 2;
int offs_y = ( m_symbol_bbox.GetHeight() + m_fbox_size.GetHeight() ) / 2;
if( aFieldSide.x != 0 )
offs_x += HPADDING;
else if( aFieldSide.y != 0 )
offs_y += VPADDING;
fbox_center.x += aFieldSide.x * offs_x;
fbox_center.y += aFieldSide.y * offs_y;
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wxPoint fbox_pos( fbox_center.x - m_fbox_size.GetWidth() / 2,
fbox_center.y - m_fbox_size.GetHeight() / 2 );
return fbox_pos;
}
/**
* Shift a field box up or down a bit to make the fields fit between some wires.
* Returns true if a shift was made.
*/
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bool fitFieldsBetweenWires( EDA_RECT* aBox, SIDE aSide )
{
if( aSide != SIDE_TOP && aSide != SIDE_BOTTOM )
return false;
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std::vector<SCH_ITEM*> colliders = filterCollisions( *aBox );
if( colliders.empty() )
return false;
// Find the offset of the wires for proper positioning
int offset = 0;
for( SCH_ITEM* item : colliders )
{
SCH_LINE* line = dynamic_cast<SCH_LINE*>( item );
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if( !line )
return false;
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wxPoint start = line->GetStartPoint(), end = line->GetEndPoint();
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if( start.y != end.y )
return false;
int this_offset = (3 * WIRE_V_SPACING / 2) - ( start.y % WIRE_V_SPACING );
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if( offset == 0 )
offset = this_offset;
else if( offset != this_offset )
return false;
}
// At this point we are recomputing the field box size. Do not
// return false after this point.
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m_fbox_size = computeFBoxSize( /* aDynamic */ false );
wxPoint pos = aBox->GetPosition();
pos.y = round_n( pos.y, WIRE_V_SPACING, aSide == SIDE_BOTTOM );
aBox->SetOrigin( pos );
return true;
}
/**
* Place a field horizontally, taking into account the field width and justification.
*
* @param aField - the field to place.
* @param aFieldBox - box in which fields will be placed
*
* @return Correct field horizontal position
*/
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int fieldHorizPlacement( SCH_FIELD *aField, const EDA_RECT &aFieldBox )
{
int field_hjust;
int field_xcoord;
if( aField->IsHorizJustifyFlipped() )
field_hjust = -aField->GetHorizJustify();
else
field_hjust = aField->GetHorizJustify();
switch( field_hjust )
{
case GR_TEXT_HJUSTIFY_LEFT:
field_xcoord = aFieldBox.GetLeft();
break;
case GR_TEXT_HJUSTIFY_CENTER:
field_xcoord = aFieldBox.Centre().x;
break;
case GR_TEXT_HJUSTIFY_RIGHT:
field_xcoord = aFieldBox.GetRight();
break;
default:
wxFAIL_MSG( "Unexpected value for SCH_FIELD::GetHorizJustify()" );
field_xcoord = aFieldBox.Centre().x; // Most are centered
}
return field_xcoord;
}
/**
* Place a field vertically. Because field vertical placements accumulate,
* this takes a pointer to a vertical position accumulator.
*
* @param aField - the field to place.
* @param aFieldBox - box in which fields will be placed.
* @param aPosAccum - pointer to a position accumulator
* @param aDynamic - use dynamic spacing
*
* @return Correct field vertical position
*/
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int fieldVertPlacement( SCH_FIELD *aField, const EDA_RECT &aFieldBox, int *aPosAccum,
bool aDynamic )
{
int field_height;
int padding;
if( !aDynamic )
{
field_height = WIRE_V_SPACING / 2;
padding = WIRE_V_SPACING / 2;
}
else if( m_align_to_grid )
{
field_height = aField->GetBoundingBox().GetHeight();
padding = round_n( field_height, Mils2iu( 50 ), true ) - field_height;
}
else
{
field_height = aField->GetBoundingBox().GetHeight();
padding = FIELD_PADDING;
}
int placement = *aPosAccum + padding / 2 + field_height / 2;
*aPosAccum += padding + field_height;
return placement;
}
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private:
SCH_SCREEN* m_screen;
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SCH_SYMBOL* m_symbol;
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std::vector<SCH_FIELD*> m_fields;
std::vector<SCH_ITEM*> m_colliders;
EDA_RECT m_symbol_bbox;
wxSize m_fbox_size;
bool m_allow_rejustify;
bool m_align_to_grid;
bool m_is_power_symbol;
};
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const AUTOPLACER::SIDE AUTOPLACER::SIDE_TOP( 0, -1 );
const AUTOPLACER::SIDE AUTOPLACER::SIDE_BOTTOM( 0, 1 );
const AUTOPLACER::SIDE AUTOPLACER::SIDE_LEFT( -1, 0 );
const AUTOPLACER::SIDE AUTOPLACER::SIDE_RIGHT( 1, 0 );
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void SCH_SYMBOL::AutoplaceFields( SCH_SCREEN* aScreen, bool aManual )
{
if( aManual )
wxASSERT_MSG( aScreen, "A SCH_SCREEN pointer must be given for manual autoplacement" );
AUTOPLACER autoplacer( this, aScreen );
autoplacer.DoAutoplace( aManual );
m_fieldsAutoplaced = ( aManual ? FIELDS_AUTOPLACED_MANUAL : FIELDS_AUTOPLACED_AUTO );
}