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/**
* Helper classes for computing window query on rectangles
*/
class VerticalSegmentIntersect : public std::unary_function < PRGlyph, ptrdiff_t > {
ptrdiff_t m_Lhs;
ptrdiff_t m_Rhs;
public:
VerticalSegmentIntersect ( ptrdiff_t top, ptrdiff_t bottom ) throw() : m_Lhs(top+top), m_Rhs(bottom+bottom) {}
ptrdiff_t operator() ( PRGlyph inpGlyph ) const throw() {
QRect const* area = inpGlyph->GetGlyphArea();
ptrdiff_t x = area->bottom() + area->top(), y = area->bottom() - area->top();
if (y < x - m_Rhs ) return 0;
if (y < m_Lhs - x ) return 0;
return 1;
}
};
class HorisontalSegmentIntersect : public std::unary_function < PRGlyph, ptrdiff_t > {
ptrdiff_t m_Lhs;
ptrdiff_t m_Rhs;
public:
HorisontalSegmentIntersect ( ptrdiff_t left, ptrdiff_t right ) throw() : m_Lhs(left+left), m_Rhs(right+right) {}
ptrdiff_t operator() ( PRGlyph inpGlyph ) const throw() {
QRect const* area = inpGlyph->GetGlyphArea();
ptrdiff_t x = area->right() + area->left(), y = area->right() - area->left();
if (y < x - m_Rhs ) return 0;
if (y < m_Lhs - x ) return 0;
return 1;
}
};
/**
* Helper classes for computing containment query on rectangles
*/
class VerticalSegmentContains : public std::unary_function < PRGlyph, ptrdiff_t > {
ptrdiff_t m_Lhs;
ptrdiff_t m_Rhs;
public:
VerticalSegmentContains ( ptrdiff_t top, ptrdiff_t bottom ) throw() : m_Lhs(top+top), m_Rhs(bottom+bottom) {}
ptrdiff_t operator() ( PRGlyph inpGlyph ) const throw() {
QRect const* area = inpGlyph->GetGlyphArea();
ptrdiff_t x = area->bottom() + area->top(), y = area->bottom() - area->top();
if ( y > x - m_Lhs ) return 0;
if ( y > m_Rhs - x ) return 0;
return 1;
}
};
class HorisontalSegmentContains : public std::unary_function < PRGlyph, ptrdiff_t > {
ptrdiff_t m_Lhs;
ptrdiff_t m_Rhs;
public:
HorisontalSegmentContains ( ptrdiff_t left, ptrdiff_t right ) throw() : m_Lhs(left+left), m_Rhs(right+right) {}
ptrdiff_t operator() ( PRGlyph inpGlyph ) const throw() {
QRect const* area = inpGlyph->GetGlyphArea();
ptrdiff_t x = area->right() + area->left(), y = area->right() - area->left();
if ( y > x - m_Lhs ) return 0;
if ( y > m_Rhs - x ) return 0;
return 1;
}
};
// compute the window query on m_GlyphData rectangles
QVector<PRGlyph> :: iterator windowq = m_Selection.isValid() ?
std::partition ( m_GlyphData.begin(),
std::partition ( m_GlyphData.begin(), m_GlyphData.end(), VerticalSegmentIntersect ( m_Selection.top(), m_Selection.bottom() ) ),
HorisontalSegmentIntersect ( m_Selection.left(), m_Selection.right() )
) : m_GlyphData.begin();
// compute the containment query on window query rectangles (the containment query resuls is always subset of window query )
QVector<PRGlyph> :: iterator containq = std::partition ( m_GlyphData.begin(),
std::partition ( m_GlyphData.begin(), windowq, VerticalSegmentContains ( m_Selection.top(), m_Selection.bottom() ) ),
HorisontalSegmentContains ( m_Selection.left(), m_Selection.right() )
);
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