Bounding box for arc contains only the arc itself (excluding the center point) (GAL).

pcbnew/class_drawsegment.cpp

@@ -428,77 +428,7 @@ const EDA_RECT DRAWSEGMENT::GetBoundingBox() const
         break;
 
     case S_ARC:
-    {
+        computeArcBBox( bbox );
-        bbox.Merge( m_End );
-        // TODO perhaps the above line can be replaced with this one, so we do not include the center
-        //bbox.SetOrigin( m_End );
-        wxPoint end = m_End;
-        RotatePoint( &end, m_Start, -m_Angle );
-        bbox.Merge( end );
-
-        // Determine the starting quarter
-        // 0 right-bottom
-        // 1 left-bottom
-        // 2 left-top
-        // 3 right-top
-        unsigned int quarter = 0;       // assume right-bottom
-
-        if( m_End.x < m_Start.x )
-        {
-            if( m_End.y <= m_Start.y )
-                quarter = 2;
-            else // ( m_End.y > m_Start.y )
-                quarter = 1;
-        }
-        else if( m_End.x >= m_Start.x )
-        {
-            if( m_End.y < m_Start.y )
-                quarter = 3;
-            else if( m_End.x == m_Start.x )
-                quarter = 1;
-        }
-
-        int radius = GetRadius();
-        int angle = (int) GetArcAngleStart() % 900 + m_Angle;
-        bool directionCW = ( m_Angle > 0 );      // Is the direction of arc clockwise?
-
-        // Make the angle positive, so we go clockwise and merge points belonging to the arc
-        if( !directionCW )
-        {
-            angle = 900 - angle;
-            quarter = ( quarter + 3 ) % 4;       // -1 modulo arithmetic
-        }
-
-        while( angle > 900 )
-        {
-            switch( quarter )
-            {
-            case 0:
-                bbox.Merge( wxPoint( m_Start.x, m_Start.y + radius ) );     // down
-                break;
-
-            case 1:
-                bbox.Merge( wxPoint( m_Start.x - radius, m_Start.y ) );     // left
-                break;
-
-            case 2:
-                bbox.Merge( wxPoint( m_Start.x, m_Start.y - radius ) );     // up
-                break;
-
-            case 3:
-                bbox.Merge( wxPoint( m_Start.x + radius, m_Start.y ) );     // right
-                break;
-            }
-
-            if( directionCW )
-                ++quarter;
-            else
-                quarter += 3;       // -1 modulo arithmetic
-
-            quarter %= 4;
-            angle -= 900;
-        }
-    }
         break;
 
     case S_POLYGON:
@@ -687,3 +617,93 @@ EDA_ITEM* DRAWSEGMENT::Clone() const
 {
     return new DRAWSEGMENT( *this );
 }
+
+
+const BOX2I DRAWSEGMENT::ViewBBox() const
+{
+    // For arcs - do not include the center point in the bounding box,
+    // it is redundant for displaying an arc
+    if( m_Shape == S_ARC )
+    {
+        EDA_RECT bbox;
+        bbox.SetOrigin( m_End );
+        computeArcBBox( bbox );
+        return BOX2I( bbox.GetOrigin(), bbox.GetSize() );
+    }
+
+    return EDA_ITEM::ViewBBox();
+}
+
+
+void DRAWSEGMENT::computeArcBBox( EDA_RECT& aBBox ) const
+{
+    aBBox.Merge( m_End );
+    // TODO perhaps the above line can be replaced with this one, so we do not include the center
+    //aBBox.SetOrigin( m_End );
+    wxPoint end = m_End;
+    RotatePoint( &end, m_Start, -m_Angle );
+    aBBox.Merge( end );
+
+    // Determine the starting quarter
+    // 0 right-bottom
+    // 1 left-bottom
+    // 2 left-top
+    // 3 right-top
+    unsigned int quarter = 0;       // assume right-bottom
+
+    if( m_End.x < m_Start.x )
+    {
+        if( m_End.y <= m_Start.y )
+            quarter = 2;
+        else // ( m_End.y > m_Start.y )
+            quarter = 1;
+    }
+    else if( m_End.x >= m_Start.x )
+    {
+        if( m_End.y < m_Start.y )
+            quarter = 3;
+        else if( m_End.x == m_Start.x )
+            quarter = 1;
+    }
+
+    int radius = GetRadius();
+    int angle = (int) GetArcAngleStart() % 900 + m_Angle;
+    bool directionCW = ( m_Angle > 0 );      // Is the direction of arc clockwise?
+
+    // Make the angle positive, so we go clockwise and merge points belonging to the arc
+    if( !directionCW )
+    {
+        angle = 900 - angle;
+        quarter = ( quarter + 3 ) % 4;       // -1 modulo arithmetic
+    }
+
+    while( angle > 900 )
+    {
+        switch( quarter )
+        {
+        case 0:
+            aBBox.Merge( wxPoint( m_Start.x, m_Start.y + radius ) );     // down
+            break;
+
+        case 1:
+            aBBox.Merge( wxPoint( m_Start.x - radius, m_Start.y ) );     // left
+            break;
+
+        case 2:
+            aBBox.Merge( wxPoint( m_Start.x, m_Start.y - radius ) );     // up
+            break;
+
+        case 3:
+            aBBox.Merge( wxPoint( m_Start.x + radius, m_Start.y ) );     // right
+            break;
+        }
+
+        if( directionCW )
+            ++quarter;
+        else
+            quarter += 3;       // -1 modulo arithmetic
+
+        quarter %= 4;
+        angle -= 900;
+    }
+}

pcbnew/class_drawsegment.h

@@ -59,6 +59,9 @@ protected:
     std::vector<wxPoint>    m_BezierPoints;
     std::vector<wxPoint>    m_PolyPoints;
 
+    // Computes the bounding box for an arc
+    void computeArcBBox( EDA_RECT& aBBox ) const;
+
 public:
     DRAWSEGMENT( BOARD_ITEM* aParent = NULL, KICAD_T idtype = PCB_LINE_T );
 
@@ -242,6 +245,9 @@ public:
 
     virtual EDA_ITEM* Clone() const;
 
+    /// @copydoc VIEW_ITEM::ViewBBox()
+    virtual const BOX2I ViewBBox() const;
+
 #if defined(DEBUG)
     void Show( int nestLevel, std::ostream& os ) const { ShowDummy( os ); } // override
 #endif