118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
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#ifndef RASTER_EDGE_ITERATOR_H
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#define RASTER_EDGE_ITERATOR_H
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#include "traster.h"
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namespace TRop
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{
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namespace borders
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{
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//*********************************************************************************************************
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// RasterEdgeIterator class
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//*********************************************************************************************************
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/*!
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The RasterEdgeIterator class models a forward iterator traversing a border of a
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raster image.
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*/
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template <typename PixelSelector>
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class RasterEdgeIterator
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{
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public:
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typedef PixelSelector selector_type;
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typedef typename PixelSelector::pixel_type pixel_type;
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typedef typename PixelSelector::value_type value_type;
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typedef TRasterT<pixel_type> raster_type;
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typedef TRasterPT<pixel_type> raster_typeP;
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enum { STRAIGHT = 0x0,
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LEFT = 0x1,
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RIGHT = 0x2,
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AMBIGUOUS = 0x4,
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AMBIGUOUS_LEFT = LEFT | AMBIGUOUS,
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AMBIGUOUS_RIGHT = RIGHT | AMBIGUOUS,
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UNKNOWN = 0x8 };
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private:
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raster_typeP m_ras;
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selector_type m_selector;
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int m_lx_1, m_ly_1, m_wrap;
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value_type m_leftColor, m_rightColor, m_elbowColor;
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pixel_type *m_leftPix, *m_rightPix;
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bool m_rightSide;
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int m_turn;
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TPoint m_pos, m_dir;
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public:
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RasterEdgeIterator(const raster_typeP &rin, const selector_type &selector,
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const TPoint &pos, const TPoint &dir, int adherence = RIGHT);
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void setEdge(const TPoint &pos, const TPoint &dir);
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const raster_typeP &raster() const { return m_ras; }
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const selector_type &selector() const { return m_selector; }
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const TPoint &pos() const { return m_pos; }
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const TPoint &dir() const { return m_dir; }
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const value_type &leftColor() const { return m_leftColor; }
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const value_type &rightColor() const { return m_rightColor; }
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const value_type &color() const { return m_rightSide ? m_rightColor : m_leftColor; }
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const value_type &otherColor() const { return m_rightSide ? m_leftColor : m_rightColor; }
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const value_type &elbowColor() const { return m_elbowColor; }
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pixel_type *leftPix() const { return m_leftPix; }
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pixel_type *rightPix() const { return m_rightPix; }
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pixel_type *pix() const { return m_rightSide ? m_rightPix : m_leftPix; }
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pixel_type *otherPix() const { return m_rightSide ? m_leftPix : m_rightPix; }
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int turn() const { return m_turn; }
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void setAdherence(int side) { m_rightSide = (side == RIGHT); }
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int adherence() const { return m_rightSide ? RIGHT : LEFT; }
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RasterEdgeIterator &operator++();
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bool operator==(const RasterEdgeIterator &it) const { return m_pos == it.m_pos && m_dir == it.m_dir; }
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bool operator!=(const RasterEdgeIterator &it) const { return !operator==(it); }
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private:
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void pixels(pixel_type *&pixLeft, pixel_type *&pixRight);
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void colors(value_type &leftColor, value_type &rightColor);
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void turn(const value_type &newLeftColor, const value_type &newRightColor);
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void turnLeft()
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{
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int temp = m_dir.x;
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m_dir.x = -m_dir.y;
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m_dir.y = temp;
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m_turn = LEFT;
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}
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void turnRight()
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{
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int temp = m_dir.x;
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m_dir.x = m_dir.y;
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m_dir.y = -temp;
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m_turn = RIGHT;
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}
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void turnAmbiguous(const value_type &newLeftColor, const value_type &newRightColor);
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};
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}
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} // namespace TRop::borders
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#endif //RASTER_EDGE_ITERATOR_H
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//=====================================================================================
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#ifdef INCLUDE_HPP
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#include "raster_edge_iterator.hpp"
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#endif //INCLUDE_HPP
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