Stop pretending to use an explicit printing origin.

[geda-gaf/berndj.git] / libgeda / src / o_circle_basic.c

/* gEDA - GPL Electronic Design Automation
 * libgeda - gEDA's library
 * Copyright (C) 1998-2007 Ales Hvezda
 * Copyright (C) 1998-2007 gEDA Contributors (see ChangeLog for details)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
 */

/*! \file o_circle_basic.c
 *  \brief functions for the circle object
 */

#include <config.h>
#include <stdio.h>
#include <math.h>

#include "libgeda_priv.h"

#ifdef HAVE_LIBDMALLOC
#include <dmalloc.h>
#endif

struct st_circle {
  int center_x, center_y; /* world */
  int radius;
};

static OBJECT *o_circle_copy(TOPLEVEL *toplevel, OBJECT *o_current);
static void o_circle_grip_foreach(OBJECT *o,
                                  gboolean (*fn)(OBJECT *o,
                                                 int grip_x, int grip_y,
                                                 enum grip_t whichone,
                                                 void *userdata),
                                  void *userdata);
static int o_circle_grip_move(OBJECT *o, int whichone, int x, int y);
static void o_circle_recalc(OBJECT *o_current);

/*! Default setting for circle draw function. */
void (*circle_draw_func)() = NULL;

/*! \brief calculate the distance between two points
 *  \par Function Description
 *  This function calculates the distance between two points.
 *  The two points are defined by the (\a x1, \a y1) and (\a x2, \a y2)
 *  parameters.
 *  \param [in]  x1  x-value of the first point
 *  \param [in]  y1  y-value of the first point
 *  \param [in]  x2  x-value of the second point
 *  \param [in]  y2  y-value of the second point
 *  \return the distance
 *  \todo Move this function to a different place
 */
int dist(int x1, int y1, int x2, int y2)
{
  return sqrt(pow(x1-x2,2)+pow(y1-y2,2));
}

OBJECT *o_circle_new_at_xy(TOPLEVEL *toplevel, char type, int color, int x, int y)
{
  OBJECT *new_node;     

  /* create the object */
  new_node = s_toplevel_new_object(toplevel, type, "circle");
  new_node->color  = color;
  
  new_node->circle = (CIRCLE *) g_malloc(sizeof(CIRCLE));

  new_node->circle->center_x = x;
  new_node->circle->center_y = y;
  new_node->circle->radius = 0;

  new_node->copy_func = &o_circle_copy;
  new_node->bounds_recalc_func = o_circle_recalc;
  new_node->draw_func = circle_draw_func;  
  new_node->grip_foreach_func = &o_circle_grip_foreach;
  new_node->grip_move_func = &o_circle_grip_move;
  
  /* line type and filling initialized to default */
  o_set_line_options(new_node, END_NONE, TYPE_SOLID, 0, -1, -1);
  o_set_fill_options(new_node, FILLING_HOLLOW, -1, -1, -1, -1, -1);

  o_circle_recalc(new_node);

  return new_node;
}

/*! \brief Create and add circle OBJECT to list.
 *  \par Function Description
 *  This function creates a new object representing a circle.
 *
 *  The circle is described by its center (<B>x</B>,<B>y</B>) and its radius
 *  <B>radius</B>.
 *  The <B>type</B> parameter must be equal to <B>OBJ_CIRCLE</B>. The <B>color</B>
 *  corresponds to the color the box will be drawn with.
 *
 *  The <B>OBJECT</B> structure is allocated with the object factory.
 *  The structure describing the circle is allocated and initialized
 *  with the parameters given to the function.
 *
 *  Both the line type and the filling type are set to default values : solid
 *  line type with a width of 0, and no filling. It can be changed after
 *  with #o_set_line_options() and #o_set_fill_options().
 *
 *  \param [in]     toplevel     The TOPLEVEL object.
 *  \param [in]     type         Must be OBJ_CIRCLE.
 *  \param [in]     color        Circle line color.
 *  \param [in]     x            Center x coordinate.
 *  \param [in]     y            Center y coordinate.
 *  \param [in]     radius       Radius of new circle.
 *  \return A pointer to the new end of the object list.
 */
OBJECT *o_circle_new(TOPLEVEL *toplevel,
                     char type, int color,
                     int x, int y, int radius)
{
  OBJECT *new_node;     

  new_node = o_circle_new_at_xy(toplevel, type, color, x, y);
  
  /* describe the circle with its center and radius */
  new_node->circle->radius   = radius;
  
  /* compute the bounding box coords */
  o_circle_recalc(new_node);

  return new_node;
}

/*! \brief Create a copy of a circle.
 *  \par Function Description
 *  The function #o_circle_copy() creates a verbatim copy of the object
 *  pointed by <B>o_current</B> describing a circle.
 *
 *  \param [in]  toplevel  The TOPLEVEL object.
 *  \param [in]  o_current  Circle OBJECT to copy.
 *  \return The new OBJECT
 */
static OBJECT *o_circle_copy(TOPLEVEL *toplevel, OBJECT *o_current)
{
  OBJECT *new_obj;
  int color;

  if (o_current->saved_color == -1) {
    color = o_current->color;
  } else {
    color = o_current->saved_color;
  }

  /* A new circle object is created with #o_circle_new().
   * Values for its fields are default and need to be modified. */
  new_obj = o_circle_new (toplevel, OBJ_CIRCLE, color, 0, 0, 0);

  /*
   * The parameters of the new circle are set with the ones of the original
   * circle. The two circle have the same line type and the same filling
   * options.
   *
   * The bounding box coordinates are computed with
   * #o_circle_recalc().
   */
  /* modify */
  new_obj->circle->center_x = o_current->circle->center_x;
  new_obj->circle->center_y = o_current->circle->center_y;
  new_obj->circle->radius   = o_current->circle->radius;
  
  o_set_line_options(new_obj, o_current->line_end,
                     o_current->line_type, o_current->line_width,
                     o_current->line_length, o_current->line_space);
  o_set_fill_options(new_obj,
                     o_current->fill_type, o_current->fill_width,
                     o_current->fill_pitch1, o_current->fill_angle1,
                     o_current->fill_pitch2, o_current->fill_angle2);
  
  o_circle_recalc(new_obj);

  /*    new_obj->attribute = 0;*/

  return new_obj;
}

/*! \brief Create circle OBJECT from character string.
 *  \par Function Description
 *  The #o_circle_read() function gets from the character string <B>*buff</B> the
 *  description of a circle.
 *
 *  Depending on <B>*version</B>, the right file format is considered.
 *  Currently two file format revisions are supported :
 *  <DL>
 *    <DT>*</DT><DD>the file format used until 2000704 release.
 *    <DT>*</DT><DD>the file format used for the releases after 20000704.
 *  </DL>
 *
 *  \param [in]  toplevel       The TOPLEVEL object.
 *  \param [in]  buf             Character string with circle description.
 *  \param [in]  release_ver     libgeda release version number.
 *  \param [in]  fileformat_ver  libgeda file format version number.
 *  \return A pointer to the new circle object.
 */
OBJECT *o_circle_read(TOPLEVEL *toplevel, char buf[],
                      unsigned int release_ver, unsigned int fileformat_ver)
{
  OBJECT *new_obj;
  char type; 
  int x1, y1;
  int radius;
  int color;
  int circle_width, circle_space, circle_length;
  int fill_width, angle1, pitch1, angle2, pitch2;
  int circle_end;
  int circle_type;
  int circle_fill;

  if(release_ver <= VERSION_20000704) {
    /*
     * The old geda file format, i.e. releases 20000704 and older, does not
     * handle the line type and the filling of the box object. They are set
     * to default.
     */
    sscanf(buf, "%c %d %d %d %d\n", &type, &x1, &y1, &radius, &color);

    circle_width = 0;
    circle_end   = END_NONE;
    circle_type  = TYPE_SOLID;
    circle_length= -1;
    circle_space = -1;
    
    circle_fill  = FILLING_HOLLOW;
    fill_width  = 0;
    angle1      = -1;
    pitch1      = -1;
    angle2      = -1;
    pitch2      = -1;
                        
  } else {
        
    /*
     * The current line format to describe a circle is a space separated
     * list of characters and numbers in plain ASCII on a single line. The
     * meaning of each item is described in the file format documentation.
     */  
    sscanf(buf, "%c %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d\n",
           &type, &x1, &y1, &radius, &color,
           &circle_width, &circle_end, &circle_type,
           &circle_length, &circle_space, &circle_fill,
           &fill_width, &angle1, &pitch1, &angle2, &pitch2);
  }


  if (radius == 0) {
    s_log_message(_("Found a zero radius circle [ %c %d %d %d %d ]\n"),
                  type, x1, y1, radius, color);
        
  }
  
  if (color < 0 || color > MAX_COLORS) {
    s_log_message(_("Found an invalid color [ %s ]\n"), buf);
    s_log_message(_("Setting color to WHITE\n"));
    color = WHITE;
  }

  /* 
   * A circle is internally described by its center and its radius.
   *
   * A new object is allocated and initialized.
   * Its filling and line type are set according to the values of the field
   * on the line.
   */
  new_obj = o_circle_new(toplevel, type, color, x1, y1, radius);
  o_set_line_options(new_obj,
                     circle_end, circle_type, circle_width, 
                     circle_length, circle_space);
  o_set_fill_options(new_obj,
                     circle_fill, fill_width, pitch1, angle1, pitch2, angle2);

  return new_obj;
}

/*! \brief Create a character string representation of a circle OBJECT.
 *  \par Function Description
 *  This function formats a string in the buffer <B>*buff</B> to describe the
 *  circle object <B>*object</B>.
 *  It follows the post-20000704 release file format that handle the line
 *  type and fill options.
 *
 *  \param [in] object  Circle OBJECT to create string from.
 *  \return A pointer to the circle OBJECT character string.
 *
 *  \note
 *  Caller must g_free returned character string.
 *
 */
char *o_circle_save(OBJECT *object)
{
  int x,y;
  int radius;
  int color;
  int circle_width, circle_space, circle_length;
  int fill_width, angle1, pitch1, angle2, pitch2;
  char *buf;
  OBJECT_END circle_end;
  OBJECT_TYPE circle_type;
  OBJECT_FILLING circle_fill;

  /* circle center and radius */
  x = object->circle->center_x;
  y = object->circle->center_y;
  radius = object->circle->radius;
  
  /* line type parameters */
  circle_width = object->line_width;
  circle_end   = object->line_end;
  circle_type  = object->line_type;
  circle_length= object->line_length;
  circle_space = object->line_space;
  
  /* filling parameters */
  circle_fill  = object->fill_type;
  fill_width   = object->fill_width;
  angle1       = object->fill_angle1;
  pitch1       = object->fill_pitch1;
  angle2       = object->fill_angle2;
  pitch2       = object->fill_pitch2;
  
  /* Use the right color */
  if (object->saved_color == -1) {
    color = object->color;
  } else {
    color = object->saved_color;
  }
  
  buf = g_strdup_printf("%c %d %d %d %d %d %d %d %d %d %d %d %d %d %d %d", 
                        object->type, x, y, radius, color,
                        circle_width, circle_end, circle_type, circle_length, 
                        circle_space, circle_fill,
                        fill_width, angle1, pitch1, angle2, pitch2);
  return(buf);
}
           
/*! \brief Translate a circle position in WORLD coordinates by a delta.
 *  \par Function Description
 *  This function applies a translation of (<B>x1</B>,<B>y1</B>) to the circle
 *  described by <B>*object</B>. <B>x1</B> and <B>y1</B> are in world unit. 
 *
 *  \param [in]     dx         x distance to move.
 *  \param [in]     dy         y distance to move.
 *  \param [in,out] object     Circle OBJECT to translate.
 */
void o_circle_translate_world(int dx, int dy, OBJECT *object)
{
  if (object == NULL) printf("ctw NO!\n");

  /* Do world coords */
  object->circle->center_x = object->circle->center_x + dx;
  object->circle->center_y = object->circle->center_y + dy;
  
  /* recalc the screen coords and the bounding box */
  o_circle_recalc(object);
  
}

int o_circle_get_radius(OBJECT const *o_current)
{
  return (o_current->circle->radius);
}

static void o_circle_grip_foreach(OBJECT *o,
                                  gboolean (*fn)(OBJECT *o,
                                                 int grip_x, int grip_y,
                                                 enum grip_t whichone,
                                                 void *userdata),
                                  void *userdata)
{
  const GRIP circle_grips[] = {
    {
      .x = o->circle->center_x,
      .y = o->circle->center_y,
      .whichone = GRIP_CIRCLE_CENTER,
    },
    {
      .x = o->circle->center_x + o->circle->radius,
      .y = o->circle->center_y - o->circle->radius,
      .whichone = GRIP_CIRCLE_RADIUS,
    },
    {
      .x = o->circle->center_x - o->circle->radius,
      .y = o->circle->center_y,
      .whichone = GRIP_CIRCLE_RADIUS_LEFT,
    },
    {
      .x = o->circle->center_x + o->circle->radius,
      .y = o->circle->center_y,
      .whichone = GRIP_CIRCLE_RADIUS_RIGHT,
    },
    {
      .x = o->circle->center_x,
      .y = o->circle->center_y + o->circle->radius,
      .whichone = GRIP_CIRCLE_RADIUS_TOP,
    },
    {
      .x = o->circle->center_x,
      .y = o->circle->center_y - o->circle->radius,
      .whichone = GRIP_CIRCLE_RADIUS_BOTTOM,
    },
    { .whichone = GRIP_NONE }
  };

  s_basic_grip_foreach_helper(o, circle_grips, fn, userdata);
}

static int o_circle_grip_move(OBJECT *o, int whichone, int x, int y)
{
  int retval = whichone;
  switch (whichone) {
    double r_cos_theta, r_sin_theta;
  case GRIP_NONE:
    o->circle->center_x = x;
    o->circle->center_y = y;
    o->circle->radius = 0;
    retval = GRIP_CIRCLE_RADIUS;
    break;

  case GRIP_CIRCLE_CENTER:
    o->circle->center_x = x;
    o->circle->center_y = y;
    retval = GRIP_CIRCLE_RADIUS;
    break;
  case GRIP_CIRCLE_RADIUS:
    r_cos_theta = x - o->circle->center_x;
    r_sin_theta = y - o->circle->center_y;
    o->circle->radius = rint(sqrt(0.5*r_cos_theta*r_cos_theta +
                                  0.5*r_sin_theta*r_sin_theta));
    retval = GRIP_NONE;
    break;
  case GRIP_CIRCLE_RADIUS_LEFT:
  case GRIP_CIRCLE_RADIUS_RIGHT:
  case GRIP_CIRCLE_RADIUS_TOP:
  case GRIP_CIRCLE_RADIUS_BOTTOM:
    r_cos_theta = x - o->circle->center_x;
    r_sin_theta = y - o->circle->center_y;
    o->circle->radius = rint(sqrt(r_cos_theta*r_cos_theta +
                                  r_sin_theta*r_sin_theta));
    retval = GRIP_NONE;
    break;
  }

  o_circle_recalc(o);

  return retval;
}

/*! \brief Rotate Circle OBJECT using WORLD coordinates. 
 *  \par Function Description
 *  The function #o_circle_rotate_world() rotate the circle described by
 *  <B>*object</B> around the (<B>world_centerx</B>,<B>world_centery</B>) point by
 *  angle <B>angle</B> degrees.
 *  The center of rotation is in world unit.
 *
 *  \param [in]      world_centerx  Rotation center x coordinate in WORLD units.
 *  \param [in]      world_centery  Rotation center y coordinate in WORLD units.
 *  \param [in]      angle          Rotation angle in degrees (See note below).
 *  \param [in,out]  object         Circle OBJECT to rotate.
 */
void o_circle_rotate_world(int world_centerx, int world_centery, int angle,
                           OBJECT *object)
{
  int newx, newy;
  int x, y;

  /* Only 90 degree multiple and positive angles are allowed. */
  /* angle must be positive */
  if(angle < 0) angle = -angle;
  /* angle must be a 90 multiple or no rotation performed */
  if((angle % 90) != 0) return;
  
  /*
   * The center of rotation (<B>world_centerx</B>,<B>world_centery</B>) is
   * translated to the origin. The rotation of the center around the origin
   * is then performed. Finally, the rotated circle is translated back to
   * its previous location.
   */

  /* translate object to origin */
  object->circle->center_x -= world_centerx;
  object->circle->center_y -= world_centery;
  
  /* rotate the center of the circle around the origin */
  x = object->circle->center_x;
  y = object->circle->center_y;
  rotate_point_90(x, y, angle, &newx, &newy);
  object->circle->center_x = newx;
  object->circle->center_y = newy;
  
  /* translate back in position */
  object->circle->center_x += world_centerx;
  object->circle->center_y += world_centery;

  o_circle_recalc(object);
  
}

/*! \brief Mirror circle using WORLD coordinates.
 *  \par Function Description
 *  This function recalculates the screen coords of the <B>o_current</B> pointed
 *  circle object from its world coords.
 *
 *  The circle coordinates and its bounding are recalculated as well as the
 *  OBJECT specific (line width, filling ...).
 *
 *  \param [in]     world_centerx  Origin x coordinate in WORLD units.
 *  \param [in]     world_centery  Origin y coordinate in WORLD units.
 *  \param [in,out] object         Circle OBJECT to mirror.
 */
void o_circle_mirror_world(int world_centerx, int world_centery,
                           OBJECT *object)
{
  /* translate object to origin */
  object->circle->center_x -= world_centerx;
  object->circle->center_y -= world_centery;

  /* mirror the center of the circle */
  object->circle->center_x = -object->circle->center_x;
  object->circle->center_y =  object->circle->center_y;

  /* translate back in position */
  object->circle->center_x += world_centerx;
  object->circle->center_y += world_centery;

  /* recalc boundings and screen coords */
  o_circle_recalc(object);
  
}

/*! \brief Recalculate circle coordinates in SCREEN units.
 *  \par Function Description
 *  This function recalculates the screen coords of the <B>o_current</B> pointed
 *  circle object from its world coords.
 *
 *  The circle coordinates and its bounding are recalculated as well as the
 *  OBJECT specific (line width, filling ...).
 *
 *  \param [in,out] o_current  Circle OBJECT to be recalculated.
 */
static void o_circle_recalc(OBJECT *o_current)
{
  int left, right, top, bottom;

  if (o_current->circle == NULL) {
    return;
  }
  
  /* update the bounding box - world unit */
  world_get_circle_bounds(o_current, &left, &top, &right, &bottom);
  o_current->w_left   = left;
  o_current->w_top    = top;
  o_current->w_right  = right;
  o_current->w_bottom = bottom;
  o_current->w_bounds_valid = TRUE;
}

/*! \brief Get circle bounding rectangle in WORLD coordinates.
 *  \par Function Description
 *  This function sets the <B>left</B>, <B>top</B>, <B>right</B> and <B>bottom</B>
 *  parameters to the boundings of the circle object described in <B>*circle</B>
 *  in world units.
 *
 *  \param [in]  object     Circle OBJECT to read coordinates from.
 *  \param [out] left       Left circle coordinate in WORLD units.
 *  \param [out] top        Top circle coordinate in WORLD units.
 *  \param [out] right      Right circle coordinate in WORLD units.
 *  \param [out] bottom     Bottom circle coordinate in WORLD units.
 */
void world_get_circle_bounds(OBJECT *object, int *left,
                             int *top, int *right, int *bottom)
{
  int halfwidth;

  halfwidth = object->line_width / 2;

  *left   = object->circle->center_x - object->circle->radius;
  *top    = object->circle->center_y - object->circle->radius;
  *right  = object->circle->center_x + object->circle->radius;
  *bottom = object->circle->center_y + object->circle->radius;

  /* This isn't strictly correct, but a 1st order approximation */
  *left   -= halfwidth;
  *top    -= halfwidth;
  *right  += halfwidth;
  *bottom += halfwidth;

}

/*! \brief Print circle to Postscript document.
 *  \par Function Description
 *  This function prints the circle described by the <B>o_current</B>
 *  parameter to a Postscript document. It takes into account its line type
 *  and fill type.
 *  The Postscript document is described by the file pointer <B>fp</B>.
 *
 *  The validity of the <B>o_current</B> pointer is checked :
 *  a null pointer causes an error message and a return.
 *
 *  The description of the circle is extracted from the <B>o_current</B>
 *  parameter : the coordinates of the center of the circle, its radius,
 *  its line type, its fill type.
 *
 *  The outline and the inside of the circle are successively handled by
 *  two different sets of functions.
 *  
 *  \param [in] toplevel  The TOPLEVEL object.
 *  \param [in] fp         FILE pointer to Postscript document.
 *  \param [in] o_current  Circle OBJECT to write to document.
 */
void o_circle_print(TOPLEVEL *toplevel, FILE *fp, OBJECT *o_current)
{
  int x, y, radius;
  int color;
  int circle_width, length, space;
  int fill_width, angle1, pitch1, angle2, pitch2;
  void (*outl_func)() = NULL;
  void (*fill_func)() = NULL;

  if (o_current == NULL) {
    printf("got null in o_circle_print\n");
    return;
  }

  x      = o_current->circle->center_x; 
  y      = o_current->circle->center_y;
  radius = o_current->circle->radius;

  color  = o_current->color;

  /*
   * Depending on the type of the line for this particular circle, the
   * appropriate function is chosen among #o_circle_print_solid(),
   * #o_circle_print_dotted(), #o_circle_print_dashed(),
   * #o_circle_print_center() and #o_circle_print_phantom().
   *
   * The needed parameters for each of these type is extracted from the
   * <B>o_current</B> object. Depending on the type, unused parameters are
   * set to -1.
   *
   * In the eventuality of a length and/or space null, the line is
   * printed solid to avoid and endless loop produced by other functions
   * in such a case.
   */
  circle_width = o_current->line_width;
  if(circle_width <=2) {
    if(toplevel->line_style == THICK) {
      circle_width=LINE_WIDTH;
    } else {
      circle_width=2;
    }
  }
  length       = o_current->line_length;
  space        = o_current->line_space;

  switch(o_current->line_type) {
    case(TYPE_SOLID):
      length = -1; space  = -1;
      outl_func = o_circle_print_solid;
      break;

    case(TYPE_DOTTED):
      length = -1;
      outl_func = o_circle_print_dotted;
      break;

    case(TYPE_DASHED):
      outl_func = o_circle_print_dashed;
      break;

    case(TYPE_CENTER):
      outl_func = o_circle_print_center;
      break;

    case(TYPE_PHANTOM):
      outl_func = o_circle_print_phantom;
      break;

    case(TYPE_ERASE):
      /* Unused for now print it solid */
      length = -1; space  = -1;
      outl_func = o_circle_print_solid;
      break;
  }

  if((length == 0) || (space == 0)) {
    length = -1; space  = -1;
    outl_func = o_circle_print_solid;
  }

  (*outl_func)(toplevel, fp,
               x, y,
               radius,
               color,
               circle_width, length, space);

  /*
   * If the filling type of the circle is not <B>HOLLOW</B>, the appropriate
   * function is chosen among #o_circle_print_filled(), #o_circle_print_mesh()
   * and #o_circle_print_hatch(). The corresponding parameters are extracted
   * from the <B>o_current</B> object and corrected afterward.
   *
   * The case where <B>pitch1</B> and <B>pitch2</B> are null or negative is
   * avoided as it leads to an endless loop in most of the called functions.
   * In such a case, the circle is printed filled. Unused parameters for
   * each of these functions are set to -1 or any passive value.
   */
  if(o_current->fill_type != FILLING_HOLLOW) {
    fill_width = o_current->fill_width;
    angle1     = o_current->fill_angle1;
    pitch1     = o_current->fill_pitch1;
    angle2     = o_current->fill_angle2;
    pitch2     = o_current->fill_pitch2;
                
    switch(o_current->fill_type) {
      case(FILLING_FILL):
        angle1 = -1; pitch1 = 1;
        angle2 = -1; pitch2 = 1;
        fill_width = -1;
        fill_func = o_circle_print_filled;
        break;
                        
      case(FILLING_MESH):
        fill_func = o_circle_print_mesh;
        break;
                                
      case(FILLING_HATCH):
        angle2 = -1; pitch2 = 1;
        fill_func = o_circle_print_hatch;
        break;
                                
      case(FILLING_VOID):
                                /* Unused for now, print it filled */
        angle1 = -1; pitch1 = 1;
        angle2 = -1; pitch2 = 1;
        fill_width = -1;
        fill_func = o_circle_print_filled;
        break;
        
      case(FILLING_HOLLOW):
        /* nop */
        break;
    }

    if((pitch1 <= 0) || (pitch2 <= 0)) {
      angle1 = -1; pitch1 = 1;
      angle2 = -1; pitch2 = 1;
      fill_func = o_circle_print_filled;
    }
                
    (*fill_func)(toplevel, fp,
                 x, y, radius,
                 color,
                 fill_width,
                 angle1, pitch1, angle2, pitch2);
  }
}

/*! \brief Print a solid circle to Postscript document.
 *  \par Function Description
 *  This function prints the outline of a circle when a solid line type
 *  is required. The circle is defined by its center in (<B>x</B>, <B>y</B>)
 *  and its radius in <B>radius</B>. It is printed with the color given
 *  in <B>color</B>.
 *  The parameters <B>length</B> and <B>space</B> are ignored.
 *
 *  It uses the function #o_arc_print_solid() to print the outline.
 *  Therefore it acts as an interface between the way a circle is defined
 *  and the way an arc is defined.
 *
 *  All dimensions are in mils.
 *
 *  \param [in] toplevel     The TOPLEVEL object.
 *  \param [in] fp            FILE pointer to Postscript document.
 *  \param [in] x             Center x coordinate of circle.
 *  \param [in] y             Center y coordinate of circle.
 *  \param [in] radius        Circle radius.
 *  \param [in] color         Circle color.
 *  \param [in] circle_width  Width of circle.
 *  \param [in] length        (unused).
 *  \param [in] space         (unused).
 */
void o_circle_print_solid(TOPLEVEL *toplevel, FILE *fp,
                          int x, int y, int radius,
                          int color,
                          int circle_width, int length, int space)
{
  o_arc_print_solid(toplevel, fp,
                    x, y, radius,
                    0, FULL_CIRCLE / 64,
                    color,
                    circle_width, -1, -1);
}


/*! \brief Print a dotted circle to Postscript document.
 *  \par Function Description
 *  This function prints the outline of a circle when a dotted line
 *  type is required. The circle is defined by its center
 *  in (<B>x</B>, <B>y</B>) and its radius in <B>radius</B>. It is printed
 *  with the color given in <B>color</B>.
 *  The parameter <B>length</B> is ignored.
 *
 *  It uses the function #o_arc_print_dotted() to print the outline.
 *  Therefore it acts as an interface between the way a circle is
 *  defined and the way an arc is defined.
 *
 *  All dimensions are in mils.
 *
 *  \param [in] toplevel     The TOPLEVEL object.
 *  \param [in] fp            FILE pointer to Postscript document.
 *  \param [in] x             Center x coordinate of circle.
 *  \param [in] y             Center y coordinate of circle.
 *  \param [in] radius        Circle radius.
 *  \param [in] color         Circle color.
 *  \param [in] circle_width  Width of circle.
 *  \param [in] length        (unused).
 *  \param [in] space         Space between dots.
 */
void o_circle_print_dotted(TOPLEVEL *toplevel, FILE *fp,
                           int x, int y, int radius,
                           int color,
                           int circle_width, int length, int space)
{
  o_arc_print_dotted(toplevel, fp,
                     x, y, radius,
                     0, FULL_CIRCLE / 64,
                     color,
                     circle_width, -1, space);
}

/*! \brief Print a dashed circle to Postscript document.
 *  \par Function Description
 *  This function prints the outline of a circle when a dashed line type
 *  is required. The circle is defined by its center in
 *  (<B>x</B>, <B>y</B>) and its radius in <B>radius</B>. It is printed with the
 *  color given in <B>color</B>.
 *
 *  It uses the function #o_arc_print_dashed() to print the outline.
 *  Therefore it acts as an interface between the way a circle is
 *  defined and the way an arc is defined.
 *
 *  All dimensions are in mils.
 *
 *  \param [in] toplevel     The TOPLEVEL object.
 *  \param [in] fp            FILE pointer to Postscript document.
 *  \param [in] x             Center x coordinate of circle.
 *  \param [in] y             Center y coordinate of circle.
 *  \param [in] radius        Circle radius.
 *  \param [in] color         Circle color.
 *  \param [in] circle_width  Width of circle.
 *  \param [in] length        Length of dashed lines.
 *  \param [in] space         Space between dashes.
 */
void o_circle_print_dashed(TOPLEVEL *toplevel, FILE *fp,
                           int x, int y,
                           int radius,
                           int color,
                           int circle_width, int length, int space)
{
  o_arc_print_dashed(toplevel, fp,
                     x, y, radius,
                     0, FULL_CIRCLE / 64,
                     color,
                     circle_width, length, space);
}

/*! \brief Print a centered line type circle to Postscript document.
 *  \par Function Description
 *  This function prints the outline of a circle when a centered line
 *  type is required. The circle is defined by its center in
 *  (<B>x</B>, <B>y</B>) and its radius in <B>radius</B>. It is printed with the
 *  color given in <B>color</B>.
 *
 *  It uses the function #o_arc_print_center() to print the outline.
 *  Therefore it acts as an interface between the way a circle is
 *  defined and the way an arc is defined.
 *
 *  All dimensions are in mils.
 *
 *  \param [in] toplevel     The TOPLEVEL object.
 *  \param [in] fp            FILE pointer to Postscript document.
 *  \param [in] x             Center x coordinate of circle.
 *  \param [in] y             Center y coordinate of circle.
 *  \param [in] radius        Circle radius.
 *  \param [in] color         Circle color.
 *  \param [in] circle_width  Width of circle.
 *  \param [in] length        Length of dashed lines.
 *  \param [in] space         Space between dashes.
 */
void o_circle_print_center(TOPLEVEL *toplevel, FILE *fp,
                           int x, int y,
                           int radius,
                           int color,
                           int circle_width, int length, int space)
{
  o_arc_print_center(toplevel, fp,
                     x, y, radius,
                     0, FULL_CIRCLE / 64,
                     color,
                     circle_width, length, space);
}

/*! \brief Print a phantom line type circle to Postscript document.
 *  \par Function Description
 *  This function prints the outline of a circle when a phantom line type
 *  is required. The circle is defined by its center in
 *  (<B>x</B>, <B>y</B>) and its radius in <B>radius</B>. It is printed with the
 *  color given in <B>color</B>.
 *
 *  It uses the function #o_arc_print_phantom() to print the outline.
 *  Therefore it acts as an interface between the way a circle is defined
 *  and the way an arc is defined.
 *
 *  All dimensions are in mils.
 *
 *  \param [in] toplevel     The TOPLEVEL object.
 *  \param [in] fp            FILE pointer to Postscript document.
 *  \param [in] x             Center x coordinate of circle.
 *  \param [in] y             Center y coordinate of circle.
 *  \param [in] radius        Circle radius.
 *  \param [in] color         Circle color.
 *  \param [in] circle_width  Width of circle.
 *  \param [in] length        Length of dashed lines.
 *  \param [in] space         Space between dashes.
 */
void o_circle_print_phantom(TOPLEVEL *toplevel, FILE *fp,
                            int x, int y,
                            int radius,
                            int color,
                            int circle_width, int length, int space)
{
  o_arc_print_phantom(toplevel, fp,
                      x, y, radius,
                      0, FULL_CIRCLE / 64,
                      color,
                      circle_width, length, space);
}

/*! \brief Print a solid pattern circle to Postscript document.
 *  \par Function Description
 *  The function prints a filled circle with a solid pattern.
 *  No outline is printed. 
 *  The circle is defined by the coordinates of its center in
 *  (<B>x</B>,<B>y</B>) and its radius given by the <B>radius</B> parameter. 
 *  The postscript file is defined by the file pointer <B>fp</B>.
 *  <B>fill_width</B>, <B>angle1</B> and <B>pitch1</B>, <B>angle2</B>
 *  and <B>pitch2</B> parameters are ignored in this functions but
 *  kept for compatibility with other fill functions.
 *
 *  All dimensions are in mils (except <B>angle1</B> and <B>angle2</B> in degree). 
 *
 *  \param [in] toplevel   The TOPLEVEL object.
 *  \param [in] o_current   The object to print.
 *  \param [in] fp          FILE pointer to Postscript document.
 *  \param [in] x           Center x coordinate of circle.
 *  \param [in] y           Center y coordinate of circle.
 *  \param [in] radius      Radius of circle.
 *  \param [in] color       Circle color.
 *  \param [in] fill_width  Circle fill width. (unused).
 *  \param [in] angle1      (unused).
 *  \param [in] pitch1      (unused).
 *  \param [in] angle2      (unused).
 *  \param [in] pitch2      (unused).
 */
void o_circle_print_filled(TOPLEVEL *toplevel, OBJECT *o_current, FILE *fp,
                           int x, int y, int radius,
                           int color,
                           int fill_width,
                           int angle1, int pitch1,
                           int angle2, int pitch2)
{
  if (toplevel->print_color) {
    f_print_set_color(fp, color);
  }

  fprintf(fp, "%d %d %d dot\n", x, y, radius);
}

/*! \brief Print a mesh pattern circle to Postscript document.
 *  \par Function Description
 *  This function prints a meshed circle. No outline is printed. 
 *  The circle is defined by the coordinates of its center in
 *  (<B>x</B>,<B>y</B>) and its radius by the <B>radius</B> parameter. 
 *  The Postscript document is defined by the file pointer <B>fp</B>. 
 *
 *  The inside mesh is achieved by two successive call to the
 *  #o_circle_print_hatch() function, given <B>angle1</B> and <B>pitch1</B>
 *  the first time and <B>angle2</B> and <B>pitch2</B> the second time.
 *
 *  Negative or null values for <B>pitch1</B> and/or <B>pitch2</B> are
 *  not allowed as it leads to an endless loop in #o_circle_print_hatch().
 *
 *  All dimensions are in mils (except <B>angle1</B> and <B>angle2</B> in degree).
 *
 *  \param [in] toplevel   The TOPLEVEL object.
 *  \param [in] o_current   The object to print.
 *  \param [in] fp          FILE pointer to Postscript document.
 *  \param [in] x           Center x coordinate of circle.
 *  \param [in] y           Center y coordinate of circle.
 *  \param [in] radius      Radius of circle.
 *  \param [in] color       Circle color.
 *  \param [in] fill_width  Circle fill width.
 *  \param [in] angle1      1st angle for mesh pattern.
 *  \param [in] pitch1      1st pitch for mesh pattern.
 *  \param [in] angle2      2nd angle for mesh pattern.
 *  \param [in] pitch2      2nd pitch for mesh pattern.
 */
void o_circle_print_mesh(TOPLEVEL *toplevel, OBJECT *o_current, FILE *fp,
                         int x, int y, int radius,
                         int color,
                         int fill_width,
                         int angle1, int pitch1,
                         int angle2, int pitch2)
{
  o_circle_print_hatch(toplevel, o_current, fp,
                       x, y, radius,
                       color,
                       fill_width,
                       angle1, pitch1,
                       -1, -1);
  o_circle_print_hatch(toplevel, o_current, fp,
                       x, y, radius,
                       color,
                       fill_width,
                       angle2, pitch2,
                       -1, -1);
}

/*! \brief Print a hatch pattern circle to Postscript document.
 *  \par Function Description
 *  The function prints a hatched circle. No outline is printed. 
 *  The circle is defined by the coordinates of its center in
 *  (<B>x</B>,<B>y</B>) and its radius by the <B>radius</B> parameter. 
 *  The Postscript document is defined by the file pointer <B>fp</B>. 
 *  <B>angle2</B> and <B>pitch2</B> parameters are ignored in this
 *  functions but kept for compatibility with other fill functions.
 *
 *  The only attribute of line here is its width from the parameter <B>width</B>.
 *
 *  Negative or null values for <B>pitch1</B> is not allowed as it
 *  leads to an endless loop.
 *
 *  All dimensions are in mils (except <B>angle1</B> is in degrees).
 *
 *  \param [in] toplevel   The TOPLEVEL object.
 *  \param [in] o_current   The object to print.
 *  \param [in] fp          FILE pointer to Postscript document.
 *  \param [in] x           Center x coordinate of circle.
 *  \param [in] y           Center y coordinate of circle.
 *  \param [in] radius      Radius of circle.
 *  \param [in] color       Circle color.
 *  \param [in] fill_width  Circle fill width.
 *  \param [in] angle1      Angle for hatch pattern.
 *  \param [in] pitch1      Pitch for hatch pattern.
 *  \param [in] angle2      (unused).
 *  \param [in] pitch2      (unused).
 */
void o_circle_print_hatch(TOPLEVEL *toplevel, OBJECT *o_current, FILE *fp,
                          int x, int y, int radius,
                          int color,
                          int fill_width,
                          int angle1, int pitch1,
                          int angle2, int pitch2)
{
  GArray *lines;

  g_return_if_fail(toplevel != NULL);
  g_return_if_fail(fp != NULL);

  if (toplevel->print_color) {
    f_print_set_color(fp, color);
  }

  /* Avoid printing line widths too small */
  if (fill_width <= 1) fill_width = 2;

  lines = m_hatch_new();

  m_hatch_circle(o_current, angle1, pitch1, lines);

  g_array_free(lines, TRUE);
}

/*! \brief Calculates the distance between the given point and the closest
 * point on the perimeter of the circle.
 *
 *  \param [in] circle The circle of the OBJECT
 *  \param [in] x The x coordinate of the given point.
 *  \param [in] y The y coordinate of the given point.
 *  \return The shortest distance from the object to the point.  With an
 *  invalid parameter, this function returns G_MAXDOUBLE.
 */
gdouble o_circle_shortest_distance(CIRCLE const *circle, gint x, gint y)
{
  gdouble distance_to_center;
  gdouble dx;
  gdouble dy;
  gdouble shortest_distance;

  if (circle == NULL) {
    g_critical("o_circle_shortest_distance(): circle == NULL\n");
    return FALSE;
  }

  dx = ((gdouble) x) - ((gdouble) circle->center_x);
  dy = ((gdouble) y) - ((gdouble) circle->center_y);

  distance_to_center = sqrt((dx*dx) + (dy*dy));

  shortest_distance = fabs(distance_to_center - circle->radius);

  return shortest_distance;
}