path: root/generic/Attrs.c

/*
 * Attrs.c -- Various attributes manipulation routines.
 *
 * Authors		: Patrick Lecoanet.
 * Creation date	: Fri Dec 31 10:03:34 1999
 *
 * $Id$
 */

/*
 *  Copyright (c) 1993 - 1999 CENA, Patrick Lecoanet --
 *
 * This code is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This code 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this code; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */


#include "Attrs.h"
#include "Item.h"
#include "List.h"
#include "Geo.h"

#include <memory.h>
#include <malloc.h>
#include <stdlib.h>


static const char rcsid[] = "$Id$";
static const char compile_id[]="$Compile: " __FILE__ " " __DATE__ " " __TIME__ " $";


/*
 ******************************************************************
 *
 * Code for label formats.
 *
 ******************************************************************
 */
static Tcl_HashTable	format_cache;
static ZnBool		format_inited = False;

#if 0
static char
AttachToChar(char	attach)
{
  switch (attach) {
  case LF_ATTACH_FWD:
    return '>';
  case LF_ATTACH_BWD:
    return '<';
  case LF_ATTACH_LEFT:
    return '^';
  case LF_ATTACH_RIGHT:
    return '$';
  case LF_ATTACH_PIXEL:
  default:
    return '+';
  }
}

static char
DimToChar(char	dim)
{
  switch (dim) {
  case LF_DIM_FONT:
    return 'f';
  case LF_DIM_ICON:
    return 'i';
  case LF_DIM_AUTO:
    return 'a';
  case LF_DIM_PIXEL:
  default:
    return 'x';
  }
}
#endif

static char
CharToAttach(char	attach)
{
  switch (attach) {
  case '>':
    return LF_ATTACH_FWD;
  case '<':
    return LF_ATTACH_BWD;
  case '^':
    return LF_ATTACH_LEFT;
  case '$':
    return LF_ATTACH_RIGHT;
  case '+':
  default:
    return LF_ATTACH_PIXEL;
  }
}

static char
CharToDim(char	dim)
{
  switch (dim) {
  case 'f':
    return LF_DIM_FONT;
  case 'i':
    return LF_DIM_ICON;
  case 'a':
    return LF_DIM_AUTO;
  case 'x':
  default:
    return LF_DIM_PIXEL;
  }
}

/*
 * The new format is as follow. Parameters between [] are
 * optional and take default values when omitted. The spaces can appear
 * between blocks but not inside.
 *
 *	[ WidthxHeight ] [ field0Spec ][ field1Spec ]...[ fieldnSpec ]
 *
 * Width and Height set the size of the clipping box surrounding
 * the label. If it is not specified, there will be no clipping.
 * It it is specified alone it is the size of the only displayed
 * field (0).
 *
 * fieldSpec is:
 *	sChar fieldWidth sChar fieldHeight [pChar fieldX pChar fieldY].
 *
 * Each field description refers to the field of same index in the field
 * array.
 * If sChar is 'x', the dimension is in pixel. If sChar is 'f', the
 * dimension is in percentage of the mean width/height of a character (in the
 * field font). If sChar is 'i', the dimension is in percentage of the size
 * of the image in the field. If sChar is 'a', the dimension is automatically
 * adjusted to match the field's content plus the given value in pixels.
 * If pChar is '+' the position is in pixel (possibly negative). If it is
 * '<' the position is the index of the field at the left/top of which the
 * current field should be  attached. If it is '>' the position is the index
 * of the field at the right/bottom of which the current field should be
 * attached. If pChar is '^' the position is the index of the field used to
 * align the left/top border (left on left or top on top). If pChar is '$' the
 * position is the index of the field used to align the right/bottom border
 * (right on right or bottom on bottom). 
 * The positional parameters can be omitted if there is only one field.
 *
 */
LabelFormat
LabelFormatCreate(Tcl_Interp	*interp,
		  char		*format_str,
		  int		num_fields)
{
  ZnList	fields;
  Tcl_HashEntry	*entry;
  FieldFormatStruct field_struct;
  FieldFormat	field_array;
  LabelFormat	format;
  int		width, height;
  ZnDim		c_width=0.0, c_height=0.0;
  int		index, num_tok, num_ffs, new;
  int		field_index=0;
  char		*ptr = format_str, *next_ptr;
  char		x_char, y_char;

  if (!format_inited) {
    Tcl_InitHashTable(&format_cache, TCL_STRING_KEYS);
    format_inited = True;
  }
  entry = Tcl_CreateHashEntry(&format_cache, format_str, &new);
  if (!new) {
    format = (LabelFormat) Tcl_GetHashValue(entry);
    if (format->num_fields <= num_fields) {
      format->ref_count++;
      return format;
    }
    else {
      Tcl_AppendResult(interp, "too many fields in label format: \"",
		       format_str, "\"", NULL);
      return NULL;
    }
  }
  
  fields = ZnListNew(1, sizeof(FieldFormatStruct));
  
  /*
   * Try to see if it starts with a number or a leader spec.
   */
  while (*ptr && (*ptr == ' ')) {
    ptr++;
  }
  if (!*ptr) {
    goto lf_end_parse;
  }
  if ((*ptr != 'x') && (*ptr != 'f') && (*ptr != 'i') && (*ptr != 'a')) {
    c_width = (ZnDim) strtod(ptr, &next_ptr);
    if ((ptr == next_ptr) || (*next_ptr != 'x')) {
    lf_error_syn:
      Tcl_AppendResult(interp, "invalid label format specification \"",
		       ptr, "\"", NULL);
    lf_error:
      ZnListFree(fields);
      return NULL;
    }
    ptr = next_ptr+1;
    c_height = (ZnDim) strtod(ptr, &next_ptr);
    if (ptr == next_ptr) {
      goto lf_error_syn;
    }
    ptr = next_ptr;
  }
  if (!*ptr) {
    /* It is a simple spec, one field. */
    field_struct.x_attach = field_struct.y_attach = LF_ATTACH_PIXEL;
    field_struct.x_dim = field_struct.y_dim = LF_DIM_PIXEL;
    field_struct.x_spec = field_struct.y_spec = 0;
    field_struct.width_spec = (short) c_width;
    field_struct.height_spec = (short) c_height;
    c_width = c_height = 0.0;
    ZnListAdd(fields, &field_struct, ZnListTail);
    goto lf_end_parse;
  }
  
  /*
   * Parse the field specs.
   */
 lf_parse2:
  while (*ptr && (*ptr == ' ')) {
    ptr++;
  }
  if (!*ptr) {
    goto lf_end_parse;
  }
  /* Preset the default field values. */
  field_struct.x_spec = field_struct.y_spec = 0;
  field_struct.x_attach = field_struct.y_attach = LF_ATTACH_PIXEL;
  field_struct.x_dim = field_struct.y_dim = LF_DIM_PIXEL;
  if ((*ptr == 'x') || (*ptr == 'f') || (*ptr == 'i') || (*ptr == 'a')) {
    num_tok = sscanf(ptr, "%c%d%c%d%n", &x_char, &width,
		     &y_char, &height, &index);
    if (num_tok != 4) {
      goto lf_error_syn;
    }
    if (width < 0) {
      width = 0;
    }
    if (height < 0) {
      height = 0;
    }
    field_struct.x_dim = CharToDim(x_char);
    field_struct.y_dim = CharToDim(y_char);

    ptr += index;
    if ((*ptr == '>') || (*ptr == '<') || (*ptr == '+') ||
	(*ptr == '^') || (*ptr == '$')) {
      num_tok = sscanf(ptr, "%c%d%c%d%n", &x_char, &field_struct.x_spec,
		       &y_char, &field_struct.y_spec, &index);
      if (num_tok != 4) {
	goto lf_error_syn;
      }
      field_struct.x_attach = CharToAttach(x_char);
      field_struct.y_attach = CharToAttach(y_char);

      ptr += index;
    }
    else if (!*ptr || (field_index != 0)) {
      /* An incomplete field spec is an error if there is several fields. */
      Tcl_AppendResult(interp, "incomplete field in label format: \"",
		       ptr-index, "\"", NULL);
      goto lf_error;		
    }
    if (field_index >= num_fields) {
      Tcl_AppendResult(interp, "too many fields in label format: \"",
		       format_str, "\"", NULL);
      goto lf_error;
    }
    field_struct.width_spec = (short) width;
    field_struct.height_spec = (short) height;
    ZnListAdd(fields, &field_struct, ZnListTail);
    field_index++;
    goto lf_parse2;
  }
  else {
    goto lf_error_syn;
  }
  
 lf_end_parse:
  field_array = (FieldFormat) ZnListArray(fields);
  num_ffs = ZnListSize(fields);
  
  format = (LabelFormat) ZnMalloc(sizeof(LabelFormatStruct) +
				     (num_ffs-1) * sizeof(FieldFormatStruct));
  format->clip_width = (short) c_width;
  format->clip_height = (short) c_height;
  format->num_fields = num_ffs;
  memcpy(&format->fields, field_array, num_ffs * sizeof(FieldFormatStruct));
  ZnListFree(fields);

  format->ref_count = 1;
  format->entry = entry;
  Tcl_SetHashValue(entry, (ClientData) format);
  
  return format;
}


LabelFormat
LabelFormatDuplicate(LabelFormat	lf)
{
  lf->ref_count++;
  return lf;
}


void
LabelFormatDelete(LabelFormat	lf)
{
  lf->ref_count--;
  if (lf->ref_count == 0) {
    Tcl_DeleteHashEntry(lf->entry);
    ZnFree(lf);
  }
}


char *
LabelFormatGetString(LabelFormat	lf)
{
  return Tcl_GetHashKey(&format_cache, lf->entry);

#if 0
  FieldFormat	ff;
  char		*ptr;
  char		x_char, y_char, w_char, h_char;
  int		i, count;
  
  ptr = str;
  if ((lf->clip_width != 0) || (lf->clip_height != 0)) {
    count = sprintf(ptr, "%dx%d", lf->clip_width, lf->clip_height);
    ptr += count;
  }
  if (lf->left_y < 0) {
    count = sprintf(ptr, "|%d", lf->left_x);
  }
  else {
    count = sprintf(ptr, "%%%dx%d", lf->left_x, lf->left_y);
  }
  ptr += count;
  if (lf->right_y < 0) {
    count = sprintf(ptr, "|%d", lf->right_x);
  }
  else {
    count = sprintf(ptr, "%%%dx%d", lf->right_x, lf->right_y);
  }
  ptr += count;
  for (i = 0; i < lf->num_fields; i++) {
    ff = &lf->fields[i];
    x_char = AttachToChar(ff->x_attach);
    y_char = AttachToChar(ff->y_attach);
    w_char = DimToChar(ff->x_dim);
    h_char = DimToChar(ff->y_dim);
    count = sprintf(ptr, "%c%d%c%d%c%d%c%d",
		    w_char, ff->width_spec, h_char, ff->height_spec,
		    x_char, ff->x_spec, y_char, ff->y_spec);
    ptr += count;
  }
  *ptr = 0;
#endif
}


/*
 * If the clip box has both its width and its height
 * set to zero, it means that there is no clipbox.
 */
ZnBool
LabelFormatGetClipBox(LabelFormat	lf,
		      ZnDim		*w,
		      ZnDim		*h)
{
  if ((lf->clip_width == 0) && (lf->clip_height == 0)) {
    return False;
  }

  *w = (ZnDim) lf->clip_width;
  *h = (ZnDim) lf->clip_height;
  
  return True;
}


void
LabelFormatGetField(LabelFormat	lf,
		    int		field,
		    char	*x_attach,
		    char	*y_attach,
		    char	*x_dim,
		    char	*y_dim,
		    int		*x_spec,
		    int		*y_spec,
		    short	*width_spec,
		    short	*height_spec)
{
  FieldFormat	fptr;

  fptr = &lf->fields[field];
  *x_attach = fptr->x_attach;
  *y_attach = fptr->y_attach;
  *x_dim = fptr->x_dim;
  *y_dim = fptr->y_dim;
  *x_spec = fptr->x_spec;
  *y_spec = fptr->y_spec;
  *width_spec = fptr->width_spec;
  *height_spec = fptr->height_spec;
}


/*
 ****************************************************************
 *
 * Code for line ends.
 *
 ****************************************************************
 */
static Tcl_HashTable	line_end_cache;
static ZnBool		line_end_inited = False;


LineEnd
LineEndCreate(Tcl_Interp	*interp,
	      char		*line_end_str)
{
  Tcl_HashEntry	*entry;
  LineEnd	le;
  int		new, argc;
  ZnReal	a, b ,c;
  
  if (!line_end_inited) {
    Tcl_InitHashTable(&line_end_cache, TCL_STRING_KEYS);
    line_end_inited = True;
  }

  entry = Tcl_CreateHashEntry(&line_end_cache, line_end_str, &new);
  if (!new) {
    le = (LineEnd) Tcl_GetHashValue(entry);
    le->ref_count++;
    return le;
  }

  argc = sscanf(line_end_str, "%lf %lf %lf", &a, &b, &c);
  if (argc == 3) {
    le = (LineEnd) ZnMalloc(sizeof(LineEndStruct));
    le->shape_a = a;
    le->shape_b = b;
    le->shape_c = c;
    le->entry = entry;
    le->ref_count = 1;
    Tcl_SetHashValue(entry, (ClientData) le);
    return le;
  }
  else {
    Tcl_AppendResult(interp, "incorrect line end spec: \"",
		     line_end_str, "\", should be: shapeA shapeB shapeC", NULL);
    return NULL;
  }
}


char *
LineEndGetString(LineEnd	le)
{
  return Tcl_GetHashKey(&line_end_cache, le->entry);
}


void
LineEndDelete(LineEnd	le)
{
  le->ref_count--;
  if (le->ref_count == 0) {
    Tcl_DeleteHashEntry(le->entry);
    ZnFree(le);
  }
}


LineEnd
LineEndDuplicate(LineEnd	le)
{
  le->ref_count++;
  return le;
}