C_OUTLINE Class Reference

#include <coutln.h>

Inheritance diagram for C_OUTLINE:

List of all members.

Public Member Functions
	C_OUTLINE ()
	C_OUTLINE (CRACKEDGE *startpt, ICOORD bot_left, ICOORD top_right, inT16 length)
	C_OUTLINE (ICOORD startpt, DIR128 *new_steps, inT16 length)
	C_OUTLINE (C_OUTLINE *srcline, FCOORD rotation)
	~C_OUTLINE ()
BOOL8	flag (C_OUTLINE_FLAGS mask) const
void	set_flag (C_OUTLINE_FLAGS mask, BOOL8 value)
C_OUTLINE_LIST *	child ()
const TBOX &	bounding_box () const
void	set_step (inT16 stepindex, inT8 stepdir)
void	set_step (inT16 stepindex, DIR128 stepdir)
const ICOORD &	start_pos () const
inT32	pathlength () const
DIR128	step_dir (inT16 index) const
ICOORD	step (inT16 index) const
inT32	area ()
inT32	perimeter ()
inT32	outer_area ()
inT32	count_transitions (inT32 threshold)
BOOL8	operator< (const C_OUTLINE &other) const
BOOL8	operator> (C_OUTLINE &other) const
inT16	winding_number (ICOORD testpt) const
inT16	turn_direction () const
void	reverse ()
void	move (const ICOORD vec)
void	RemoveSmallRecursive (int min_size, C_OUTLINE_IT *it)
void	render (int left, int top, Pix *pix) const
void	render_outline (int left, int top, Pix *pix) const
void	plot (ScrollView *window, ScrollView::Color colour) const
C_OUTLINE &	operator= (const C_OUTLINE &source)
Static Public Member Functions
static void	FakeOutline (const TBOX &box, C_OUTLINE_LIST *outlines)
static C_OUTLINE *	deep_copy (const C_OUTLINE *src)
static ICOORD	chain_step (int chaindir)

---

Detailed Description

Definition at line 44 of file coutln.h.

---

Constructor & Destructor Documentation

C_OUTLINE::C_OUTLINE

(

)

[inline]

Definition at line 47 of file coutln.h.

                {  //empty constructor
      steps = NULL;
    }

C_OUTLINE::C_OUTLINE	(	CRACKEDGE *	startpt,
		ICOORD	bot_left,
		ICOORD	top_right,
		inT16	length
	)

Definition at line 44 of file coutln.cpp.

 :box (bot_left, top_right), start (startpt->pos) {
  inT16 stepindex;               //index to step
  CRACKEDGE *edgept;             //current point

  stepcount = length;            //no of steps
  if (length == 0) {
    steps = NULL;
    return;
  }
                                 //get memory
  steps = (uinT8 *) alloc_mem (step_mem());
  memset(steps, 0, step_mem());
  edgept = startpt;

  for (stepindex = 0; stepindex < length; stepindex++) {
                                 //set compact step
    set_step (stepindex, edgept->stepdir);
    edgept = edgept->next;
  }
}

C_OUTLINE::C_OUTLINE	(	ICOORD	startpt,
		DIR128 *	new_steps,
		inT16	length
	)

Definition at line 76 of file coutln.cpp.

 :start (startpt) {
  inT8 dirdiff;                  //direction difference
  DIR128 prevdir;                //previous direction
  DIR128 dir;                    //current direction
  DIR128 lastdir;                //dir of last step
  TBOX new_box;                   //easy bounding
  inT16 stepindex;               //index to step
  inT16 srcindex;                //source steps
  ICOORD pos;                    //current position

  pos = startpt;
  stepcount = length;            //no of steps
                                 //get memory
  steps = (uinT8 *) alloc_mem (step_mem());
  memset(steps, 0, step_mem());

  lastdir = new_steps[length - 1];
  prevdir = lastdir;
  for (stepindex = 0, srcindex = 0; srcindex < length;
  stepindex++, srcindex++) {
    new_box = TBOX (pos, pos);
    box += new_box;
                                 //copy steps
    dir = new_steps[srcindex];
    set_step(stepindex, dir);
    dirdiff = dir - prevdir;
    pos += step (stepindex);
    if ((dirdiff == 64 || dirdiff == -64) && stepindex > 0) {
      stepindex -= 2;            //cancel there-and-back
      prevdir = stepindex >= 0 ? step_dir (stepindex) : lastdir;
    }
    else
      prevdir = dir;
  }
  ASSERT_HOST (pos.x () == startpt.x () && pos.y () == startpt.y ());
  do {
    dirdiff = step_dir (stepindex - 1) - step_dir (0);
    if (dirdiff == 64 || dirdiff == -64) {
      start += step (0);
      stepindex -= 2;            //cancel there-and-back
      for (int i = 0; i < stepindex; ++i)
        set_step(i, step_dir(i + 1));
    }
  }
  while (stepindex > 1 && (dirdiff == 64 || dirdiff == -64));
  stepcount = stepindex;
  ASSERT_HOST (stepcount >= 4);
}

C_OUTLINE::C_OUTLINE	(	C_OUTLINE *	srcline,
		FCOORD	rotation
	)

Definition at line 136 of file coutln.cpp.

                      {
  TBOX new_box;                   //easy bounding
  inT16 stepindex;               //index to step
  inT16 dirdiff;                 //direction change
  ICOORD pos;                    //current position
  ICOORD prevpos;                //previous dest point

  ICOORD destpos;                //destination point
  inT16 destindex;               //index to step
  DIR128 dir;                    //coded direction
  uinT8 new_step;

  stepcount = srcline->stepcount * 2;
  if (stepcount == 0) {
    steps = NULL;
    box = srcline->box;
    box.rotate(rotation);
    return;
  }
                                 //get memory
  steps = (uinT8 *) alloc_mem (step_mem());
  memset(steps, 0, step_mem());

  for (int iteration = 0; iteration < 2; ++iteration) {
    DIR128 round1 = iteration == 0 ? 32 : 0;
    DIR128 round2 = iteration != 0 ? 32 : 0;
    pos = srcline->start;
    prevpos = pos;
    prevpos.rotate (rotation);
    start = prevpos;
    box = TBOX (start, start);
    destindex = 0;
    for (stepindex = 0; stepindex < srcline->stepcount; stepindex++) {
      pos += srcline->step (stepindex);
      destpos = pos;
      destpos.rotate (rotation);
      //  printf("%i %i %i %i ", destpos.x(), destpos.y(), pos.x(), pos.y());
      while (destpos.x () != prevpos.x () || destpos.y () != prevpos.y ()) {
        dir = DIR128 (FCOORD (destpos - prevpos));
        dir += 64;                 //turn to step style
        new_step = dir.get_dir ();
        //  printf(" %i\n", new_step);
        if (new_step & 31) {
          set_step(destindex++, dir + round1);
          prevpos += step(destindex - 1);
          if (destindex < 2
            || ((dirdiff =
            step_dir (destindex - 1) - step_dir (destindex - 2)) !=
            -64 && dirdiff != 64)) {
            set_step(destindex++, dir + round2);
            prevpos += step(destindex - 1);
          } else {
            prevpos -= step(destindex - 1);
            destindex--;
            prevpos -= step(destindex - 1);
            set_step(destindex - 1, dir + round2);
            prevpos += step(destindex - 1);
          }
        }
        else {
          set_step(destindex++, dir);
          prevpos += step(destindex - 1);
        }
        while (destindex >= 2 &&
               ((dirdiff =
                 step_dir (destindex - 1) - step_dir (destindex - 2)) == -64 ||
                dirdiff == 64)) {
          prevpos -= step(destindex - 1);
          prevpos -= step(destindex - 2);
          destindex -= 2;        // Forget u turn
        }
        //ASSERT_HOST(prevpos.x() == destpos.x() && prevpos.y() == destpos.y());
        new_box = TBOX (destpos, destpos);
        box += new_box;
      }
    }
    ASSERT_HOST (destpos.x () == start.x () && destpos.y () == start.y ());
    dirdiff = step_dir (destindex - 1) - step_dir (0);
    while ((dirdiff == 64 || dirdiff == -64) && destindex > 1) {
      start += step (0);
      destindex -= 2;
      for (int i = 0; i < destindex; ++i)
        set_step(i, step_dir(i + 1));
      dirdiff = step_dir (destindex - 1) - step_dir (0);
    }
    if (destindex >= 4)
      break;
  }
  ASSERT_HOST(destindex <= stepcount);
  stepcount = destindex;
  destpos = start;
  for (stepindex = 0; stepindex < stepcount; stepindex++) {
    destpos += step (stepindex);
  }
  ASSERT_HOST (destpos.x () == start.x () && destpos.y () == start.y ());
}

C_OUTLINE::~C_OUTLINE

(

)

[inline]

Definition at line 64 of file coutln.h.

                  {              //destructor
      if (steps != NULL)
        free_mem(steps);
      steps = NULL;
    }

---

Member Function Documentation

inT32 C_OUTLINE::area

(

)

Definition at line 253 of file coutln.cpp.

                      {  //winding number
  int stepindex;                 //current step
  inT32 total_steps;             //steps to do
  inT32 total;                   //total area
  ICOORD pos;                    //position of point
  ICOORD next_step;              //step to next pix
  C_OUTLINE_IT it = child ();

  pos = start_pos ();
  total_steps = pathlength ();
  total = 0;
  for (stepindex = 0; stepindex < total_steps; stepindex++) {
                                 //all intersected
    next_step = step (stepindex);
    if (next_step.x () < 0)
      total += pos.y ();
    else if (next_step.x () > 0)
      total -= pos.y ();
    pos += next_step;
  }
  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ())
    total += it.data ()->area ();//add areas of children

  return total;
}

const TBOX& C_OUTLINE::bounding_box

(

)

const [inline]

Definition at line 85 of file coutln.h.

                                     {
      return box;
    }

ICOORD C_OUTLINE::chain_step

(

int

chaindir

)

[static]

Definition at line 723 of file coutln.cpp.

                                         {
  return step_coords[chaindir % 4];
}

C_OUTLINE_LIST* C_OUTLINE::child

(

)

[inline]

Definition at line 80 of file coutln.h.

                            {  //get child list
      return &children;
    }

inT32 C_OUTLINE::count_transitions

(

inT32

threshold

)

Definition at line 335 of file coutln.cpp.

                                    {
  BOOL8 first_was_max_x;         //what was first
  BOOL8 first_was_max_y;
  BOOL8 looking_for_max_x;       //what is next
  BOOL8 looking_for_min_x;
  BOOL8 looking_for_max_y;       //what is next
  BOOL8 looking_for_min_y;
  int stepindex;                 //current step
  inT32 total_steps;             //steps to do
                                 //current limits
  inT32 max_x, min_x, max_y, min_y;
  inT32 initial_x, initial_y;    //initial limits
  inT32 total;                   //total changes
  ICOORD pos;                    //position of point
  ICOORD next_step;              //step to next pix

  pos = start_pos ();
  total_steps = pathlength ();
  total = 0;
  max_x = min_x = pos.x ();
  max_y = min_y = pos.y ();
  looking_for_max_x = TRUE;
  looking_for_min_x = TRUE;
  looking_for_max_y = TRUE;
  looking_for_min_y = TRUE;
  first_was_max_x = FALSE;
  first_was_max_y = FALSE;
  initial_x = pos.x ();
  initial_y = pos.y ();          //stop uninit warning
  for (stepindex = 0; stepindex < total_steps; stepindex++) {
                                 //all intersected
    next_step = step (stepindex);
    pos += next_step;
    if (next_step.x () < 0) {
      if (looking_for_max_x && pos.x () < min_x)
        min_x = pos.x ();
      if (looking_for_min_x && max_x - pos.x () > threshold) {
        if (looking_for_max_x) {
          initial_x = max_x;
          first_was_max_x = FALSE;
        }
        total++;
        looking_for_max_x = TRUE;
        looking_for_min_x = FALSE;
        min_x = pos.x ();        //reset min
      }
    }
    else if (next_step.x () > 0) {
      if (looking_for_min_x && pos.x () > max_x)
        max_x = pos.x ();
      if (looking_for_max_x && pos.x () - min_x > threshold) {
        if (looking_for_min_x) {
          initial_x = min_x;     //remember first min
          first_was_max_x = TRUE;
        }
        total++;
        looking_for_max_x = FALSE;
        looking_for_min_x = TRUE;
        max_x = pos.x ();
      }
    }
    else if (next_step.y () < 0) {
      if (looking_for_max_y && pos.y () < min_y)
        min_y = pos.y ();
      if (looking_for_min_y && max_y - pos.y () > threshold) {
        if (looking_for_max_y) {
          initial_y = max_y;     //remember first max
          first_was_max_y = FALSE;
        }
        total++;
        looking_for_max_y = TRUE;
        looking_for_min_y = FALSE;
        min_y = pos.y ();        //reset min
      }
    }
    else {
      if (looking_for_min_y && pos.y () > max_y)
        max_y = pos.y ();
      if (looking_for_max_y && pos.y () - min_y > threshold) {
        if (looking_for_min_y) {
          initial_y = min_y;     //remember first min
          first_was_max_y = TRUE;
        }
        total++;
        looking_for_max_y = FALSE;
        looking_for_min_y = TRUE;
        max_y = pos.y ();
      }
    }

  }
  if (first_was_max_x && looking_for_min_x) {
    if (max_x - initial_x > threshold)
      total++;
    else
      total--;
  }
  else if (!first_was_max_x && looking_for_max_x) {
    if (initial_x - min_x > threshold)
      total++;
    else
      total--;
  }
  if (first_was_max_y && looking_for_min_y) {
    if (max_y - initial_y > threshold)
      total++;
    else
      total--;
  }
  else if (!first_was_max_y && looking_for_max_y) {
    if (initial_y - min_y > threshold)
      total++;
    else
      total--;
  }

  return total;
}

static C_OUTLINE* C_OUTLINE::deep_copy

(

const C_OUTLINE *

src

)

[inline, static]

Definition at line 167 of file coutln.h.

                                                      {
      C_OUTLINE* outline = new C_OUTLINE;
      *outline = *src;
      return outline;
    }

void C_OUTLINE::FakeOutline	(	const TBOX &	box,
		C_OUTLINE_LIST *	outlines
	)		[static]

Definition at line 237 of file coutln.cpp.

                                                                     {
  C_OUTLINE_IT ol_it(outlines);
  // Make a C_OUTLINE from the bounds. This is a bit of a hack,
  // as there is no outline, just a bounding box, but it works nicely.
  CRACKEDGE start;
  start.pos = box.topleft();
  C_OUTLINE* outline = new C_OUTLINE(&start, box.topleft(), box.botright(), 0);
  ol_it.add_to_end(outline);
}

BOOL8 C_OUTLINE::flag

(

C_OUTLINE_FLAGS

mask

)

const [inline]

Definition at line 70 of file coutln.h.

                                           {  //flag to test
      return flags.bit (mask);
    }

void C_OUTLINE::move

(

const ICOORD

vec

)

Definition at line 592 of file coutln.cpp.

                      {
  C_OUTLINE_IT it(&children);  // iterator

  box.move (vec);
  start += vec;

  for (it.mark_cycle_pt (); !it.cycled_list (); it.forward ())
    it.data ()->move (vec);      // move child outlines
}

BOOL8 C_OUTLINE::operator<

(

const C_OUTLINE &

other

)

const

Definition at line 464 of file coutln.cpp.

{
  inT16 count = 0;               //winding count
  ICOORD pos;                    //position of point
  inT32 stepindex;               //index to cstep

  if (!box.overlap (other.box))
    return FALSE;                //can't be contained
  if (stepcount == 0)
    return other.box.contains(this->box);

  pos = start;
  for (stepindex = 0; stepindex < stepcount
    && (count = other.winding_number (pos)) == INTERSECTING; stepindex++)
    pos += step (stepindex);     //try all points
  if (count == INTERSECTING) {
                                 //all intersected
    pos = other.start;
    for (stepindex = 0; stepindex < other.stepcount
      && (count = winding_number (pos)) == INTERSECTING; stepindex++)
                                 //try other way round
      pos += other.step (stepindex);
    return count == INTERSECTING || count == 0;
  }
  return count != 0;
}

C_OUTLINE & C_OUTLINE::operator=

(

const C_OUTLINE &

source

)

Definition at line 707 of file coutln.cpp.

  {
  box = source.box;
  start = source.start;
  if (steps != NULL)
    free_mem(steps);
  stepcount = source.stepcount;
  steps = (uinT8 *) alloc_mem (step_mem());
  memmove (steps, source.steps, step_mem());
  if (!children.empty ())
    children.clear ();
  children.deep_copy(&source.children, &deep_copy);
  return *this;
}

BOOL8 C_OUTLINE::operator>

(

C_OUTLINE &

other

)

const [inline]

Definition at line 132 of file coutln.h.

    {
      return other < *this;      //use the < to do it
    }

inT32 C_OUTLINE::outer_area

(

)

Definition at line 303 of file coutln.cpp.

                            {  //winding number
  int stepindex;                 //current step
  inT32 total_steps;             //steps to do
  inT32 total;                   //total area
  ICOORD pos;                    //position of point
  ICOORD next_step;              //step to next pix

  pos = start_pos ();
  total_steps = pathlength ();
  if (total_steps == 0)
    return box.area();
  total = 0;
  for (stepindex = 0; stepindex < total_steps; stepindex++) {
                                 //all intersected
    next_step = step (stepindex);
    if (next_step.x () < 0)
      total += pos.y ();
    else if (next_step.x () > 0)
      total -= pos.y ();
    pos += next_step;
  }

  return total;
}

inT32 C_OUTLINE::pathlength

(

)

const [inline]

Definition at line 111 of file coutln.h.

                             {  //get path length
      return stepcount;
    }

inT32 C_OUTLINE::perimeter

(

)

Definition at line 285 of file coutln.cpp.

                           {
  inT32 total_steps;             // Return value.
  C_OUTLINE_IT it = child();

  total_steps = pathlength();
  for (it.mark_cycle_pt(); !it.cycled_list(); it.forward())
    total_steps += it.data()->pathlength();  // Add perimeters of children.

  return total_steps;
}

void C_OUTLINE::plot	(	ScrollView *	window,
		ScrollView::Color	colour
	)		const

Definition at line 667 of file coutln.cpp.

                            {
  inT16 stepindex;               // index to cstep
  ICOORD pos;                    // current position
  DIR128 stepdir;                // direction of step

  pos = start;                   // current position
  window->Pen(colour);
  if (stepcount == 0) {
    window->Rectangle(box.left(), box.top(), box.right(), box.bottom());
    return;
  }
  window->SetCursor(pos.x(), pos.y());

  stepindex = 0;
  while (stepindex < stepcount) {
    pos += step(stepindex);    // step to next
    stepdir = step_dir(stepindex);
    stepindex++;               // count steps
    // merge straight lines
    while (stepindex < stepcount &&
           stepdir.get_dir() == step_dir(stepindex).get_dir()) {
      pos += step(stepindex);
      stepindex++;
    }
    window->DrawTo(pos.x(), pos.y());
  }
}

void C_OUTLINE::RemoveSmallRecursive	(	int	min_size,
		C_OUTLINE_IT *	it
	)

Definition at line 609 of file coutln.cpp.

                                                                   {
  if (box.width() < min_size || box.height() < min_size) {
    ASSERT_HOST(this == it->data());
    delete it->extract();  // Too small so get rid of it and any children.
  } else if (!children.empty()) {
    // Search the children of this, deleting any that are too small.
    C_OUTLINE_IT child_it(&children);
    for (child_it.mark_cycle_pt(); !child_it.cycled_list();
         child_it.forward()) {
      C_OUTLINE* child = child_it.data();
      child->RemoveSmallRecursive(min_size, &child_it);
    }
  }
}

void C_OUTLINE::render	(	int	left,
		int	top,
		Pix *	pix
	)		const

Definition at line 626 of file coutln.cpp.

                                                        {
  ICOORD pos = start;
  for (int stepindex = 0; stepindex < stepcount; ++stepindex) {
    ICOORD next_step = step(stepindex);
    if (next_step.y() < 0) {
      pixRasterop(pix, 0, top - pos.y(), pos.x() - left, 1,
                  PIX_NOT(PIX_DST), NULL, 0, 0);
    } else if (next_step.y() > 0) {
      pixRasterop(pix, 0, top - pos.y() - 1, pos.x() - left, 1,
                  PIX_NOT(PIX_DST), NULL, 0, 0);
    }
    pos += next_step;
  }
}

void C_OUTLINE::render_outline	(	int	left,
		int	top,
		Pix *	pix
	)		const

Definition at line 643 of file coutln.cpp.

                                                                {
  ICOORD pos = start;
  for (int stepindex = 0; stepindex < stepcount; ++stepindex) {
    ICOORD next_step = step(stepindex);
    if (next_step.y() < 0) {
      pixSetPixel(pix, pos.x() - left, top - pos.y(), 1);
    } else if (next_step.y() > 0) {
      pixSetPixel(pix, pos.x() - left - 1, top - pos.y() - 1, 1);
    } else if (next_step.x() < 0) {
      pixSetPixel(pix, pos.x() - left - 1, top - pos.y(), 1);
    } else if (next_step.x() > 0) {
      pixSetPixel(pix, pos.x() - left, top - pos.y() - 1, 1);
    }
    pos += next_step;
  }
}

void C_OUTLINE::reverse

(

)

Definition at line 569 of file coutln.cpp.

                        {  //reverse drection
  DIR128 halfturn = MODULUS / 2; //amount to shift
  DIR128 stepdir;                //direction of step
  inT16 stepindex;               //index to cstep
  inT16 farindex;                //index to other side
  inT16 halfsteps;               //half of stepcount

  halfsteps = (stepcount + 1) / 2;
  for (stepindex = 0; stepindex < halfsteps; stepindex++) {
    farindex = stepcount - stepindex - 1;
    stepdir = step_dir (stepindex);
    set_step (stepindex, step_dir (farindex) + halfturn);
    set_step (farindex, stepdir + halfturn);
  }
}

void C_OUTLINE::set_flag	(	C_OUTLINE_FLAGS	mask,
		BOOL8	value
	)		[inline]

Definition at line 74 of file coutln.h.

                               {         //value to set
      flags.set_bit (mask, value);
    }

void C_OUTLINE::set_step	(	inT16	stepindex,
		inT8	stepdir
	)		[inline]

Definition at line 88 of file coutln.h.

                                {     //chain code
      int shift = stepindex%4 * 2;
      uinT8 mask = 3 << shift;
      steps[stepindex/4] = ((stepdir << shift) & mask) |
                           (steps[stepindex/4] & ~mask);
      //squeeze 4 into byte
    }

void C_OUTLINE::set_step	(	inT16	stepindex,
		DIR128	stepdir
	)		[inline]

Definition at line 97 of file coutln.h.

                                  {   //direction
                                 //clean it
      inT8 chaindir = stepdir.get_dir() >> (DIRBITS - 2);
                                 //difference
      set_step(stepindex, chaindir);
      //squeeze 4 into byte
    }

const ICOORD& C_OUTLINE::start_pos

(

)

const [inline]

Definition at line 108 of file coutln.h.

                                    {
      return start;
    }

ICOORD C_OUTLINE::step

(

inT16

index

)

const [inline]

Definition at line 120 of file coutln.h.

                                   { //index of step
      return step_coords[(steps[index/4] >> (index%4 * 2)) & STEP_MASK];
    }

DIR128 C_OUTLINE::step_dir

(

inT16

index

)

const [inline]

Definition at line 115 of file coutln.h.

                                       {
      return DIR128((inT16)(((steps[index/4] >> (index%4 * 2)) & STEP_MASK) <<
                      (DIRBITS - 2)));
    }

inT16 C_OUTLINE::turn_direction

(

)

const

Definition at line 540 of file coutln.cpp.

                                      {  //winding number
  DIR128 prevdir;                //previous direction
  DIR128 dir;                    //current direction
  inT16 stepindex;               //index to cstep
  inT8 dirdiff;                  //direction difference
  inT16 count;                   //winding count

  if (stepcount == 0)
    return 128;
  count = 0;
  prevdir = step_dir (stepcount - 1);
  for (stepindex = 0; stepindex < stepcount; stepindex++) {
    dir = step_dir (stepindex);
    dirdiff = dir - prevdir;
    ASSERT_HOST (dirdiff == 0 || dirdiff == 32 || dirdiff == -32);
    count += dirdiff;
    prevdir = dir;
  }
  ASSERT_HOST (count == 128 || count == -128);
  return count;                  //winding number
}

inT16 C_OUTLINE::winding_number

(

ICOORD

testpt

)

const

Definition at line 500 of file coutln.cpp.

                                       {
  inT16 stepindex;               //index to cstep
  inT16 count;                   //winding count
  ICOORD vec;                    //to current point
  ICOORD stepvec;                //step vector
  inT32 cross;                   //cross product

  vec = start - point;           //vector to it
  count = 0;
  for (stepindex = 0; stepindex < stepcount; stepindex++) {
    stepvec = step (stepindex);  //get the step
                                 //crossing the line
    if (vec.y () <= 0 && vec.y () + stepvec.y () > 0) {
      cross = vec * stepvec;     //cross product
      if (cross > 0)
        count++;                 //crossing right half
      else if (cross == 0)
        return INTERSECTING;     //going through point
    }
    else if (vec.y () > 0 && vec.y () + stepvec.y () <= 0) {
      cross = vec * stepvec;
      if (cross < 0)
        count--;                 //crossing back
      else if (cross == 0)
        return INTERSECTING;     //illegal
    }
    vec += stepvec;              //sum vectors
  }
  return count;                  //winding number
}

---

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

• tesseract-ocr/ccstruct/coutln.h
• tesseract-ocr/ccstruct/coutln.cpp