PB_LINE_IT Class Reference

#include <polyblk.h>

List of all members.

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Detailed Description

Class for dealing with a polygonal block holding a line.

Definition at line 122 of file polyblk.h.

Public Member Functions

• ICOORDELT_LIST * get_line (INT16 y)

  Loads line & returns a result.
  

• NEWDELETE2 (PB_LINE_IT) void set_to_block(POLY_BLOCK *blkptr)
• PB_LINE_IT (POLY_BLOCK *blkptr)

Private Attributes

• POLY_BLOCK * block

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Constructor & Destructor Documentation

PB_LINE_IT::PB_LINE_IT

(

POLY_BLOCK *

blkptr

)

[inline]

Definition at line 125 of file polyblk.h.

                                   {
      block = blkptr;
    }

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Member Function Documentation

ICOORDELT_LIST * PB_LINE_IT::get_line

(

INT16

y

)

Loads line & returns a result.

Definition at line 323 of file polyblk.cpp.

References block, lessthan(), POLY_BLOCK::points(), ICOORD::set_y(), and ICOORD::y().

Referenced by POLY_BLOCK::fill(), and make_margins().

                                            { 
  ICOORDELT_IT v, r;
  ICOORDELT_LIST *result;
  ICOORDELT *x, *current, *previous;
  float fy, fx;

  fy = (float) (y + 0.5);
  result = new ICOORDELT_LIST ();
  r.set_to_list (result);
  v.set_to_list (block->points ());

  for (v.mark_cycle_pt (); !v.cycled_list (); v.forward ()) {
    if (((v.data_relative (-1)->y () > y) && (v.data ()->y () <= y))
    || ((v.data_relative (-1)->y () <= y) && (v.data ()->y () > y))) {
      previous = v.data_relative (-1);
      current = v.data ();
      fx = (float) (0.5 + previous->x () +
        (current->x () - previous->x ()) * (fy -
        previous->y ()) /
        (current->y () - previous->y ()));
      x = new ICOORDELT ((INT16) fx, 0);
      r.add_to_end (x);
    }
  }

  if (!r.empty ()) {
    r.sort (lessthan);
    for (r.mark_cycle_pt (); !r.cycled_list (); r.forward ())
      x = r.data ();
    for (r.mark_cycle_pt (); !r.cycled_list (); r.forward ()) {
      r.data ()->set_y (r.data_relative (1)->x () - r.data ()->x ());
      r.forward ();
      delete (r.extract ());
    }
  }

  return result;
}

PB_LINE_IT::NEWDELETE2

(

PB_LINE_IT

)

[inline]

Definition at line 130 of file polyblk.h.

                                                                    {
      block = blkptr;
    }

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Member Data Documentation

POLY_BLOCK* PB_LINE_IT::block [private]

Definition at line 137 of file polyblk.h.

Referenced by get_line().

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The documentation for this class was generated from the following files:

• ccstruct/polyblk.h
• ccstruct/polyblk.cpp

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