pin_layout_cache.cpp

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The KiCad Developers
 *
 * 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 3
 * 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 at
 * http://www.gnu.org/licenses/
 */
 
#include "pin_layout_cache.h"
#include <geometry/direction45.h>
#include <pgm_base.h>
#include <settings/settings_manager.h>
#include <sch_symbol.h>
#include <eeschema_settings.h>
#include <schematic_settings.h>
#include <string_utils.h>
#include <geometry/shape_utils.h>
 
// Small margin in internal units between the pin text and the pin line
static const int PIN_TEXT_MARGIN = 4;
 
// Forward declaration for helper implemented in sch_pin.cpp
wxString FormatStackedPinForDisplay( const wxString& aPinNumber, int aPinLength, int aTextSize,
                                     KIFONT::FONT* aFont, const KIFONT::METRICS& aFontMetrics );
 
std::optional<PIN_LAYOUT_CACHE::TEXT_INFO> PIN_LAYOUT_CACHE::GetPinNumberInfo( int aShadowWidth )
{
    recomputeCaches();
 
    wxString number = m_pin.GetShownNumber();
 
    if( number.IsEmpty() || !m_pin.GetParentSymbol()->GetShowPinNumbers() )
        return std::nullopt;
 
    // Format stacked representation if necessary
    EESCHEMA_SETTINGS*     cfg = GetAppSettings<EESCHEMA_SETTINGS>( "eeschema" );
    KIFONT::FONT*          font = KIFONT::FONT::GetFont( cfg ? cfg->m_Appearance.default_font : wxString( "" ) );
    const KIFONT::METRICS& metrics = m_pin.GetFontMetrics();
    int                    length = m_pin.GetLength();
    int                    num_size = m_pin.GetNumberTextSize();
    wxString               formatted = FormatStackedPinForDisplay( number, length, num_size, font, metrics );
 
    std::optional<TEXT_INFO> info = TEXT_INFO();
    info->m_Text = formatted;
    info->m_TextSize = num_size;
    info->m_Thickness = m_numberThickness;
    info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
    info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
 
    PIN_ORIENTATION orient = m_pin.PinDrawOrient( DefaultTransform );
 
    auto estimateQABox = [&]( const wxString& txt, int size, bool isVertical ) -> VECTOR2I
    {
        int h = size;
        int w = (int) ( txt.Length() * size * 0.6 );
 
        if( txt.Contains( '\n' ) )
        {
            wxArrayString lines;
            wxStringSplit( txt, lines, '\n' );
 
            if( isVertical )
            {
                int lineSpacing = KiROUND( size * 1.3 );
                w = (int) lines.size() * lineSpacing;
                size_t maxLen = 0;
                for( const wxString& l : lines )
                    maxLen = std::max( maxLen, l.Length() );
                h = (int) ( maxLen * size * 0.6 );
            }
            else
            {
                int lineSpacing = KiROUND( size * 1.3 );
                h = (int) lines.size() * lineSpacing;
                size_t maxLen = 0;
                for( const wxString& l : lines )
                    maxLen = std::max( maxLen, l.Length() );
                w = (int) ( maxLen * size * 0.6 );
            }
        }
 
        return VECTOR2I( w, h );
    };
 
    // Pass 1: determine maximum perpendicular half span among all pin numbers to ensure
    // a single distance from the pin center that avoids overlap for every pin.
    const SYMBOL* parentSym = m_pin.GetParentSymbol();
    int           maxHalfHeight = 0; // vertical half span across all numbers (for horizontal pins)
    int           maxHalfWidth = 0;  // horizontal half span across all numbers (for vertical pins when rotated)
    int           maxFullHeight = 0; // full height (for dynamic clearance)
 
    if( parentSym )
    {
        for( const SCH_PIN* p : parentSym->GetPins() )
        {
            wxString raw = p->GetShownNumber();
 
            if( raw.IsEmpty() )
                continue;
 
            wxString fmt = FormatStackedPinForDisplay( raw, p->GetLength(), p->GetNumberTextSize(), font,
                                                       p->GetFontMetrics() );
            // For horizontal pins: compute vertical extent (height when text is horizontal)
            VECTOR2I boxHoriz = estimateQABox( fmt, p->GetNumberTextSize(), false );
            maxHalfHeight = std::max( maxHalfHeight, boxHoriz.y / 2 );
            maxFullHeight = std::max( maxFullHeight, boxHoriz.y );
 
            // For vertical pins: compute horizontal extent when text is rotated vertical
            // When text is vertical, the perpendicular span is the original height
            VECTOR2I boxVert = estimateQABox( fmt, p->GetNumberTextSize(), true );
            maxHalfWidth = std::max( maxHalfWidth, boxVert.x / 2 );
        }
    }
 
    int       clearance = getPinTextOffset() + schIUScale.MilsToIU( PIN_TEXT_MARGIN );
    VECTOR2I  pinPos = m_pin.GetPosition();
    const int halfLength = m_pin.GetLength() / 2;
    bool      verticalOrient = ( orient == PIN_ORIENTATION::PIN_UP || orient == PIN_ORIENTATION::PIN_DOWN );
 
    // Calculate the current pin's text dimensions for positioning.
    VECTOR2I currentBox = estimateQABox( formatted, info->m_TextSize, verticalOrient );
    int currentHalfHeight = currentBox.y / 2;
    int currentHalfWidth = currentBox.x / 2;
 
    // Detect if this is a stacked pin number (contains notation like [1-5] or comma-separated values)
    bool hasStackingNotation = number.Contains( '[' ) || number.Contains( ',' );
 
    if( verticalOrient )
    {
        // Vertical pins: text is rotated vertical so that it reads bottom->top.
 
        // Check if both name and number are displayed
        bool showBothNameAndNumber = !m_pin.GetShownName().IsEmpty()
                                     && parentSym
                                     && parentSym->GetShowPinNames()
                                     && parentSym->GetPinNameOffset() == 0; // name is outside
 
        // Calculate perpendicular offset based on text structure
        int perpendicularOffset;
 
        if( hasStackingNotation || formatted.Contains( '\n' ) )
        {
            // Stacked/multi-line text: use width-based offset for proper spacing
            // of stacked pin numbers. Use currentHalfWidth to match original behavior.
            perpendicularOffset = clearance + currentHalfWidth + m_numberThickness;
        }
        else
        {
            // True single-line text (no stacking): use text height for consistent
            // spacing across rotations. This fixes issue 21980 where single-line pin
            // names/numbers would have different perpendicular offsets at different rotations.
            perpendicularOffset = clearance + info->m_TextSize / 2 + m_numberThickness;
        }
 
        int centerX;
 
        if( showBothNameAndNumber )
        {
            // When both are shown: name goes to the left, number goes to the right
            centerX = pinPos.x + perpendicularOffset;
        }
        else
        {
            // When only number is shown: place it to the left of the pin
            centerX = pinPos.x - perpendicularOffset;
        }
 
        info->m_TextPosition.x = centerX;
 
        if( orient == PIN_ORIENTATION::PIN_DOWN )
            info->m_TextPosition.y = pinPos.y + halfLength;
        else
            info->m_TextPosition.y = pinPos.y - halfLength;
 
        info->m_Angle = ANGLE_VERTICAL;
    }
    else
    {
        // Horizontal pins: "above" means negative Y direction.
 
        // Check if both name and number are displayed
        bool showBothNameAndNumber = !m_pin.GetShownName().IsEmpty()
                                     && parentSym
                                     && parentSym->GetShowPinNames()
                                     && parentSym->GetPinNameOffset() == 0; // name is outside
 
        int centerY;
        if( showBothNameAndNumber )
        {
            // When both are shown: name goes above, number goes below (top-aligned)
            // Position the number below the pin with top edge at: pinPos.y + clearance
            // Center at: pinPos.y + clearance + currentHalfHeight
            centerY = pinPos.y + clearance + currentHalfHeight + m_numberThickness;
        }
        else
        {
            // When only number is shown: place it above the pin
            centerY = pinPos.y - ( currentHalfHeight + clearance + m_numberThickness );
        }
 
        if( orient == PIN_ORIENTATION::PIN_LEFT )
            info->m_TextPosition.x = pinPos.x - halfLength; // centered horizontally along pin
        else
            info->m_TextPosition.x = pinPos.x + halfLength; // centered horizontally along pin
 
        info->m_TextPosition.y = centerY;
        info->m_Angle = ANGLE_HORIZONTAL;
    }
 
    return info;
}
 
 
static int externalPinDecoSize( const SCHEMATIC_SETTINGS* aSettings, const SCH_PIN& aPin )
{
    if( aSettings && aSettings->m_PinSymbolSize )
        return aSettings->m_PinSymbolSize;
    return aPin.GetNumberTextSize() / 2;
}
 
 
static int internalPinDecoSize( const SCHEMATIC_SETTINGS* aSettings, const SCH_PIN& aPin )
{
    if( aSettings && aSettings->m_PinSymbolSize > 0 )
        return aSettings->m_PinSymbolSize;
    return aPin.GetNameTextSize() != 0 ? aPin.GetNameTextSize() / 2 : aPin.GetNumberTextSize() / 2;
}
 
 
PIN_LAYOUT_CACHE::PIN_LAYOUT_CACHE( const SCH_PIN& aPin ) :
        m_pin( aPin ), m_schSettings( nullptr ), m_dirtyFlags( DIRTY_FLAGS::ALL )
{
    // Resolve the schematic (can be null, e.g. in previews)
    const SCHEMATIC* schematic = aPin.Schematic();
 
    if( schematic )
        m_schSettings = &schematic->Settings();
}
 
 
void PIN_LAYOUT_CACHE::MarkDirty( int aDirtyFlags )
{
    m_dirtyFlags |= aDirtyFlags;
}
 
 
void PIN_LAYOUT_CACHE::SetRenderParameters( int aNameThickness, int aNumberThickness,
                                            bool aShowElectricalType, bool aShowAltIcons )
{
    if( aNameThickness != m_nameThickness )
    {
        MarkDirty( DIRTY_FLAGS::NAME );
        m_nameThickness = aNameThickness;
    }
 
    if( aNumberThickness != m_numberThickness )
    {
        MarkDirty( DIRTY_FLAGS::NUMBER );
        m_numberThickness = aNumberThickness;
    }
 
    if( aShowElectricalType != m_showElectricalType )
    {
        MarkDirty( DIRTY_FLAGS::ELEC_TYPE );
        m_showElectricalType = aShowElectricalType;
    }
 
    // Not (yet?) cached
    m_showAltIcons = aShowAltIcons;
}
 
 
void PIN_LAYOUT_CACHE::recomputeExtentsCache( bool aDefinitelyDirty, KIFONT::FONT* aFont, int aSize,
                                              const wxString&        aText,
                                              const KIFONT::METRICS& aFontMetrics,
                                              TEXT_EXTENTS_CACHE&    aCache )
{
    // Even if not definitely dirty, verify no font changes
    if( !aDefinitelyDirty && aCache.m_Font == aFont && aCache.m_FontSize == aSize )
    {
        return;
    }
 
    aCache.m_Font = aFont;
    aCache.m_FontSize = aSize;
 
    VECTOR2D fontSize( aSize, aSize );
    int      penWidth = GetPenSizeForNormal( aSize );
 
    // Handle multi-line text bounds properly
    if( aText.StartsWith( "[" ) && aText.EndsWith( "]" ) && aText.Contains( "\n" ) )
    {
        // Extract content between braces and split into lines
        wxString content = aText.Mid( 1, aText.Length() - 2 );
        wxArrayString lines;
        wxStringSplit( content, lines, '\n' );
 
        if( lines.size() > 1 )
        {
            int lineSpacing = KiROUND( aSize * 1.3 );  // Same as drawMultiLineText
            int maxWidth = 0;
 
            // Find the widest line
            for( const wxString& line : lines )
            {
                wxString trimmedLine = line;
                trimmedLine.Trim( true ).Trim( false );
                VECTOR2I lineExtents = aFont->StringBoundaryLimits( trimmedLine, fontSize, penWidth, false, false, aFontMetrics );
                maxWidth = std::max( maxWidth, lineExtents.x );
            }
 
            // Calculate total dimensions - width is max line width, height accounts for all lines
            int totalHeight = aSize + ( lines.size() - 1 ) * lineSpacing;
 
            // Add space for braces
            int braceWidth = aSize / 3;
            maxWidth += braceWidth * 2;  // Space for braces on both sides
            totalHeight += aSize / 3;    // Extra height for brace extensions
 
            aCache.m_Extents = VECTOR2I( maxWidth, totalHeight );
            return;
        }
    }
 
    // Single line text (normal case)
    aCache.m_Extents = aFont->StringBoundaryLimits( aText, fontSize, penWidth, false, false, aFontMetrics );
}
 
 
void PIN_LAYOUT_CACHE::recomputeCaches()
{
    EESCHEMA_SETTINGS*     cfg = GetAppSettings<EESCHEMA_SETTINGS>( "eeschema" );
    KIFONT::FONT*          font = KIFONT::FONT::GetFont( cfg ? cfg->m_Appearance.default_font : wxString( "" ) );
    const KIFONT::METRICS& metrics = m_pin.GetFontMetrics();
 
    // Due to the fact a shadow text in position INSIDE or OUTSIDE is drawn left or right aligned,
    // it needs an offset = shadowWidth/2 to be drawn at the same place as normal text
    // texts drawn as GR_TEXT_H_ALIGN_CENTER do not need a specific offset.
    // this offset is shadowWidth/2 but for some reason we need to slightly modify this offset
    // for a better look (better alignment of shadow shape), for KiCad font only
    if( !font->IsOutline() )
        m_shadowOffsetAdjust = 1.2f; // Value chosen after tests
    else
        m_shadowOffsetAdjust = 1.0f;
 
    {
        const bool     dirty = isDirty( DIRTY_FLAGS::NUMBER );
        const wxString number = m_pin.GetShownNumber();
        recomputeExtentsCache( dirty, font, m_pin.GetNumberTextSize(), number, metrics, m_numExtentsCache );
    }
 
    {
        const bool     dirty = isDirty( DIRTY_FLAGS::NAME );
        const wxString name = m_pin.GetShownName();
        recomputeExtentsCache( dirty, font, m_pin.GetNameTextSize(), name, metrics, m_nameExtentsCache );
    }
 
    {
        double fontSize = std::max( m_pin.GetNameTextSize() * 3 / 4, schIUScale.mmToIU( 0.7 ) );
        recomputeExtentsCache( isDirty( DIRTY_FLAGS::ELEC_TYPE ), font, fontSize,
                               m_pin.GetElectricalTypeName(), metrics, m_typeExtentsCache );
    }
 
    setClean( DIRTY_FLAGS::NUMBER | DIRTY_FLAGS::NAME | DIRTY_FLAGS::ELEC_TYPE );
}
 
 
void PIN_LAYOUT_CACHE::transformBoxForPin( BOX2I& aBox ) const
{
    // Now, calculate boundary box corners position for the actual pin orientation
    switch( m_pin.PinDrawOrient( DefaultTransform ) )
    {
    case PIN_ORIENTATION::PIN_UP:
    {
        // Pin is rotated and texts positions are mirrored
        VECTOR2I c1{ aBox.GetLeft(), aBox.GetTop() };
        VECTOR2I c2{ aBox.GetRight(), aBox.GetBottom() };
 
        RotatePoint( c1, VECTOR2I( 0, 0 ), ANGLE_90 );
        RotatePoint( c2, VECTOR2I( 0, 0 ), ANGLE_90 );
 
        aBox = BOX2I::ByCorners( c1, c2 );
        break;
    }
    case PIN_ORIENTATION::PIN_DOWN:
    {
        VECTOR2I c1{ aBox.GetLeft(), aBox.GetTop() };
        VECTOR2I c2{ aBox.GetRight(), aBox.GetBottom() };
 
        RotatePoint( c1, VECTOR2I( 0, 0 ), -ANGLE_90 );
        RotatePoint( c2, VECTOR2I( 0, 0 ), -ANGLE_90 );
 
        c1.x = -c1.x;
        c2.x = -c2.x;
 
        aBox = BOX2I::ByCorners( c1, c2 );
        break;
    }
    case PIN_ORIENTATION::PIN_LEFT:
        // Flip it around
        aBox.Move( { -aBox.GetCenter().x * 2, 0 } );
        break;
 
    default:
    case PIN_ORIENTATION::PIN_RIGHT:
        // Already in this form
        break;
    }
 
    aBox.Move( m_pin.GetPosition() );
}
 
 
void PIN_LAYOUT_CACHE::transformTextForPin( TEXT_INFO& aInfo ) const
{
    // Local nominal position for a PIN_RIGHT orientation.
    const VECTOR2I baseLocal = aInfo.m_TextPosition;
 
    // We apply a rotation/mirroring depending on the pin orientation so that the text anchor
    // maintains a constant perpendicular offset from the pin origin regardless of rotation.
    VECTOR2I rotated = baseLocal;
    EDA_ANGLE finalAngle = aInfo.m_Angle;
 
    switch( m_pin.PinDrawOrient( DefaultTransform ) )
    {
    case PIN_ORIENTATION::PIN_RIGHT: // identity
        break;
    case PIN_ORIENTATION::PIN_LEFT:
        rotated.x = -rotated.x;
        rotated.y = -rotated.y;
        aInfo.m_HAlign = GetFlippedAlignment( aInfo.m_HAlign );
        break;
    case PIN_ORIENTATION::PIN_UP: // rotate +90 (x,y)->(y,-x) and vertical text
        rotated = { baseLocal.y, -baseLocal.x };
        finalAngle = ANGLE_VERTICAL;
        break;
    case PIN_ORIENTATION::PIN_DOWN: // rotate -90 (x,y)->(-y,x) and vertical text, flip h-align
        rotated = { -baseLocal.y, baseLocal.x };
        finalAngle = ANGLE_VERTICAL;
        aInfo.m_HAlign = GetFlippedAlignment( aInfo.m_HAlign );
        break;
    default:
        break;
    }
 
    aInfo.m_TextPosition = rotated + m_pin.GetPosition();
    aInfo.m_Angle = finalAngle;
}
 
 
BOX2I PIN_LAYOUT_CACHE::GetPinBoundingBox( bool aIncludeLabelsOnInvisiblePins,
                                           bool aIncludeNameAndNumber, bool aIncludeElectricalType )
{
    if( const SCH_SYMBOL* symbol = dynamic_cast<const SCH_SYMBOL*>( m_pin.GetParentSymbol() ) )
    {
        SCH_PIN* const libPin = m_pin.GetLibPin();
        wxCHECK( libPin, BOX2I() );
 
        BOX2I r = libPin->GetBoundingBox( aIncludeLabelsOnInvisiblePins, aIncludeNameAndNumber,
                                          aIncludeElectricalType );
 
        r = symbol->GetTransform().TransformCoordinate( r );
        r.Offset( symbol->GetPosition() );
        r.Normalize();
 
        return r;
    }
 
    bool     includeName = aIncludeNameAndNumber && !m_pin.GetShownName().IsEmpty();
    bool     includeNumber = aIncludeNameAndNumber && !m_pin.GetShownNumber().IsEmpty();
    bool     includeType = aIncludeElectricalType;
 
    if( !aIncludeLabelsOnInvisiblePins && !m_pin.IsVisible() )
    {
        includeName = false;
        includeNumber = false;
        includeType = false;
    }
 
    if( const SYMBOL* parentSymbol = m_pin.GetParentSymbol() )
    {
        if( !parentSymbol->GetShowPinNames() )
            includeName = false;
 
        if( !parentSymbol->GetShowPinNumbers() )
            includeNumber = false;
    }
 
    recomputeCaches();
 
    const int pinLength = m_pin.GetLength();
 
    // Creating and merging all the boxes is pretty quick, if cached we'd have
    // to track many variables here, which is possible, but unlikely to be worth it.
    BOX2I bbox;
 
    // Untransformed pin box
    {
        BOX2I pinBox = BOX2I::ByCorners( { 0, 0 }, { pinLength, 0 } );
        pinBox.Inflate( m_pin.GetPenWidth() / 2 );
        bbox.Merge( pinBox );
    }
 
    if( OPT_BOX2I decoBox = getUntransformedDecorationBox() )
    {
        bbox.Merge( *decoBox );
    }
 
    if( includeName )
    {
        if( OPT_BOX2I nameBox = getUntransformedPinNameBox() )
        {
            bbox.Merge( *nameBox );
        }
 
        if( OPT_BOX2I altIconBox = getUntransformedAltIconBox() )
        {
            bbox.Merge( *altIconBox );
        }
    }
 
    if( includeNumber )
    {
        if( OPT_BOX2I numBox = getUntransformedPinNumberBox() )
        {
            bbox.Merge( *numBox );
        }
    }
 
    if( includeType )
    {
        if( OPT_BOX2I typeBox = getUntransformedPinTypeBox() )
        {
            bbox.Merge( *typeBox );
        }
    }
 
    transformBoxForPin( bbox );
 
    if( m_pin.IsDangling() )
    {
        // Not much point caching this, but we could
        const CIRCLE c = GetDanglingIndicator();
 
        BOX2I cBox = BOX2I::ByCenter( c.Center, { c.Radius * 2, c.Radius * 2 } );
        // TODO: need some way to find the thickness...?
        // cBox.Inflate( ??? );
 
        bbox.Merge( cBox );
    }
 
    bbox.Normalize();
    bbox.Inflate( ( m_pin.GetPenWidth() / 2 ) + 1 );
 
    return bbox;
}
 
 
CIRCLE PIN_LAYOUT_CACHE::GetDanglingIndicator() const
{
    return CIRCLE{
        m_pin.GetPosition(),
        TARGET_PIN_RADIUS,
    };
}
 
 
int PIN_LAYOUT_CACHE::getPinTextOffset() const
{
    const float offsetRatio =
            m_schSettings ? m_schSettings->m_TextOffsetRatio : DEFAULT_TEXT_OFFSET_RATIO;
    return schIUScale.MilsToIU( KiROUND( 24 * offsetRatio ) );
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::getUntransformedPinNameBox() const
{
    int pinNameOffset = 0;
    if( const SYMBOL* parentSymbol = m_pin.GetParentSymbol() )
    {
        if( parentSymbol->GetShowPinNames() )
            pinNameOffset = parentSymbol->GetPinNameOffset();
    }
 
    // We're considering the PIN_RIGHT scenario
    //      TEXT
    //   X-------|  TEXT
    //      TEXT
    //
    // We'll rotate it later.
 
    OPT_BOX2I box;
    const int pinLength = m_pin.GetLength();
 
    if( pinNameOffset > 0 )
    {
        // This means name inside the pin
        box = BOX2I::ByCenter( { pinLength, 0 }, m_nameExtentsCache.m_Extents );
 
        // Bump over to be left aligned just inside the pin
        box->Move( { m_nameExtentsCache.m_Extents.x / 2 + pinNameOffset, 0 } );
    }
    else
    {
        // The pin name is always over the pin
        box = BOX2I::ByCenter( { pinLength / 2, 0 }, m_nameExtentsCache.m_Extents );
 
        // Bump it up
        box->Move( { 0, -m_nameExtentsCache.m_Extents.y / 2 - getPinTextOffset() } );
    }
 
    return box;
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::getUntransformedPinNumberBox() const
{
    int pinNameOffset = 0;
 
    if( const SYMBOL* parentSymbol = m_pin.GetParentSymbol() )
    {
        if( parentSymbol->GetShowPinNames() )
            pinNameOffset = parentSymbol->GetPinNameOffset();
    }
 
    const int pinLength = m_pin.GetLength();
 
    // The pin number is always over the pin (centered along its length)
    OPT_BOX2I box = BOX2I::ByCenter( { pinLength / 2, 0 }, m_numExtentsCache.m_Extents );
 
    // Check if both name and number are displayed (name outside the pin)
    bool showBothNameAndNumber = ( pinNameOffset == 0
                                   && !m_pin.GetShownName().empty()
                                   && m_pin.GetParentSymbol()->GetShowPinNames() );
 
    int textPos;
    if( showBothNameAndNumber )
    {
        // When both are shown: name goes above, number goes below (top-aligned to bottom)
        // Position the number below the pin, with its top edge at the clearance distance
        textPos = m_numExtentsCache.m_Extents.y / 2 + getPinTextOffset();
    }
    else
    {
        // When only number is shown: place it above the pin
        textPos = -m_numExtentsCache.m_Extents.y / 2 - getPinTextOffset();
    }
 
    // Bump it up (or down)
    box->Move( { 0, textPos } );
 
    return box;
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::getUntransformedPinTypeBox() const
{
    if( !m_showElectricalType )
        return std::nullopt;
 
    BOX2I box{
        { -m_typeExtentsCache.m_Extents.x, -m_typeExtentsCache.m_Extents.y / 2 },
        m_typeExtentsCache.m_Extents,
    };
 
    // Jog left
    box.Move( { -schIUScale.MilsToIU( PIN_TEXT_MARGIN ) - TARGET_PIN_RADIUS, 0 } );
 
    return box;
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::getUntransformedAltIconBox() const
{
    const OPT_BOX2I nameBox = getUntransformedPinNameBox();
 
    if( !nameBox || m_pin.GetAlternates().empty() || !m_showAltIcons )
        return std::nullopt;
 
    const int iconSize = std::min( m_pin.GetNameTextSize(), schIUScale.mmToIU( 1.5 ) );
 
    VECTOR2I c{ 0, ( nameBox->GetTop() + nameBox->GetBottom() ) / 2 };
    if( m_pin.GetParentSymbol()->GetPinNameOffset() > 0 )
    {
        // name inside, so icon more inside
        c.x = nameBox->GetRight() + iconSize * 0.75;
    }
    else
    {
        c.x = nameBox->GetLeft() - iconSize * 0.75;
    }
 
    return BOX2I::ByCenter( c, { iconSize, iconSize } );
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::getUntransformedDecorationBox() const
{
    const GRAPHIC_PINSHAPE shape = m_pin.GetShape();
    const int              decoSize = externalPinDecoSize( m_schSettings, m_pin );
    const int              intDecoSize = internalPinDecoSize( m_schSettings, m_pin );
 
    const auto makeInvertBox =
            [&]()
            {
                return BOX2I::ByCenter( { -decoSize, 0 }, { decoSize * 2, decoSize * 2 } );
            };
 
    const auto makeLowBox =
            [&]()
            {
                return BOX2I::ByCorners( { -decoSize * 2, -decoSize * 2 }, { 0, 0 } );
            };
 
    const auto makeClockBox =
            [&]()
            {
                return BOX2I::ByCorners( { 0, -intDecoSize }, { intDecoSize, intDecoSize } );
            };
 
    OPT_BOX2I box;
 
    switch( shape )
    {
    case GRAPHIC_PINSHAPE::INVERTED:
        box = makeInvertBox();
        break;
 
    case GRAPHIC_PINSHAPE::CLOCK:
        box = makeClockBox();
        break;
 
    case GRAPHIC_PINSHAPE::INVERTED_CLOCK:
        box = makeInvertBox();
        box->Merge( makeClockBox() );
        break;
 
    case GRAPHIC_PINSHAPE::INPUT_LOW:
        box = makeLowBox();
        break;
 
    case GRAPHIC_PINSHAPE::FALLING_EDGE_CLOCK:
    case GRAPHIC_PINSHAPE::CLOCK_LOW:
        box = makeLowBox();
        box->Merge( makeClockBox() );
        break;
 
    case GRAPHIC_PINSHAPE::NONLOGIC:
        box = BOX2I::ByCenter( { 0, 0 }, { decoSize * 2, decoSize * 2 } );
        break;
 
    case GRAPHIC_PINSHAPE::LINE:
    default:
        // No decoration
        break;
    }
 
    if( box )
    {
        // Put the box at the root of the pin
        box->Move( { m_pin.GetLength(), 0 } );
        box->Inflate( m_pin.GetPenWidth() / 2 );
    }
 
    return box;
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::GetPinNameBBox()
{
    recomputeCaches();
    OPT_BOX2I box = getUntransformedPinNameBox();
 
    if( box )
        transformBoxForPin( *box );
 
    return box;
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::GetPinNumberBBox()
{
    recomputeCaches();
    OPT_BOX2I box = getUntransformedPinNumberBox();
 
    if( box )
        transformBoxForPin( *box );
 
    return box;
}
 
 
OPT_BOX2I PIN_LAYOUT_CACHE::GetAltIconBBox()
{
    OPT_BOX2I box = getUntransformedAltIconBox();
 
    if( box )
        transformBoxForPin( *box );
 
    return box;
}
 
 
std::optional<PIN_LAYOUT_CACHE::TEXT_INFO> PIN_LAYOUT_CACHE::GetPinNameInfo( int aShadowWidth )
{
    recomputeCaches();
    wxString name = m_pin.GetShownName();
 
    // TODO - work out exactly what we need to do to cache this
    // (or if it's worth the memory/complexity)
    // But it's not hugely expensive to recompute, and that's what's always been
    // done to now
    //
    // Because pins are very likely to share a lot of characteristics, a global
    // cache might make more sense than a per-pin cache.
 
    if( name.IsEmpty() || !m_pin.GetParentSymbol()->GetShowPinNames() )
        return std::nullopt;
 
    std::optional<TEXT_INFO> info = TEXT_INFO();
    info->m_Text = std::move( name );
    info->m_TextSize = m_pin.GetNameTextSize();
    info->m_Thickness = m_nameThickness;
    info->m_Angle = ANGLE_HORIZONTAL;
 
    bool nameInside = m_pin.GetParentSymbol()->GetPinNameOffset() > 0;
 
    if( nameInside )
    {
        // This means name inside the pin
        VECTOR2I  pos = { m_pin.GetLength() + m_pin.GetParentSymbol()->GetPinNameOffset(), 0 };
        const int shadowOffset = KiROUND( aShadowWidth * m_shadowOffsetAdjust ) / 2;
 
        info->m_TextPosition = pos + VECTOR2I{ -shadowOffset, 0 };
        info->m_HAlign = GR_TEXT_H_ALIGN_LEFT;
        info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
        transformTextForPin( *info );
    }
    else
    {
        // The pin name is always over the pin
        VECTOR2I pos = { m_pin.GetLength() / 2, -getPinTextOffset() - info->m_Thickness / 2 };
 
        info->m_TextPosition = pos;
        info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
        info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
 
        // New policy: names follow same positioning semantics as numbers except when
        // specified as inside.  When names are inside, they should not overlap with the
        // number position.
        const SYMBOL* parentSym = m_pin.GetParentSymbol();
        if( parentSym )
        {
            int maxHalfHeight = 0;
            for( const SCH_PIN* p : parentSym->GetPins() )
            {
                wxString n = p->GetShownName();
 
                if( n.IsEmpty() )
                    continue;
 
                maxHalfHeight = std::max( maxHalfHeight, p->GetNameTextSize() / 2 );
            }
 
            int clearance = getPinTextOffset() + schIUScale.MilsToIU( PIN_TEXT_MARGIN );
            VECTOR2I pinPos = m_pin.GetPosition();
            const int halfLength = m_pin.GetLength() / 2;
            PIN_ORIENTATION orient = m_pin.PinDrawOrient( DefaultTransform );
            bool verticalOrient = ( orient == PIN_ORIENTATION::PIN_UP || orient == PIN_ORIENTATION::PIN_DOWN );
 
            if( verticalOrient )
            {
                // Vertical pins: name mirrors number placement (left + rotated) for visual consistency.
                // Use text HEIGHT (not width) for perpendicular offset - same as horizontal pins.
                // This ensures consistent spacing between horizontal and vertical pin orientations.
                int perpendicularOffset = clearance + info->m_TextSize / 2 + info->m_Thickness;
                int centerX = pinPos.x - perpendicularOffset;
                info->m_TextPosition = { centerX, pinPos.y };
 
                if( orient == PIN_ORIENTATION::PIN_DOWN )
                    info->m_TextPosition.y += halfLength;
                else
                    info->m_TextPosition.y -= halfLength;
 
                info->m_Angle = ANGLE_VERTICAL;
                info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
                info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
            }
            else
            {
                // Horizontal pins: name above (negative Y) aligned to same Y offset logic as numbers.
                info->m_TextPosition = { pinPos.x, pinPos.y - ( maxHalfHeight + clearance + info->m_Thickness ) };
 
                if( orient == PIN_ORIENTATION::PIN_LEFT )
                    info->m_TextPosition.x -= halfLength;
                else
                    info->m_TextPosition.x += halfLength;
 
                info->m_Angle = ANGLE_HORIZONTAL;
                info->m_HAlign = GR_TEXT_H_ALIGN_CENTER;
                info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
            }
        }
    }
    return info;
}
 
 
// (Removed duplicate later GetPinNumberInfo – earlier definition retained at top of file.)
 
 
std::optional<PIN_LAYOUT_CACHE::TEXT_INFO>
PIN_LAYOUT_CACHE::GetPinElectricalTypeInfo( int aShadowWidth )
{
    recomputeCaches();
 
    if( !m_showElectricalType )
        return std::nullopt;
 
    std::optional<TEXT_INFO> info = TEXT_INFO();
    info->m_Text = m_pin.GetElectricalTypeName();
    info->m_TextSize = std::max( m_pin.GetNameTextSize() * 3 / 4, schIUScale.mmToIU( 0.7 ) );
    info->m_Angle = ANGLE_HORIZONTAL;
    info->m_Thickness = info->m_TextSize / 8;
    info->m_TextPosition = { -getPinTextOffset() - info->m_Thickness / 2
                                     + KiROUND( aShadowWidth * m_shadowOffsetAdjust ) / 2,
                             0 };
    info->m_HAlign = GR_TEXT_H_ALIGN_RIGHT;
    info->m_VAlign = GR_TEXT_V_ALIGN_CENTER;
 
    info->m_TextPosition.x -= TARGET_PIN_RADIUS;
 
    if( m_pin.IsDangling() )
    {
        info->m_TextPosition.x -= TARGET_PIN_RADIUS / 2;
    }
 
    transformTextForPin( *info );
    return info;
}