render.cpp

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/* -*-C-*-
 ********************************************************************************
 *
 * File:        render.c  (Formerly render.c)
 * Description:  Convert the various data type into line lists
 * Author:       Mark Seaman, OCR Technology
 * Created:      Fri Jul 28 13:14:48 1989
 * Modified:     Mon Jul 15 10:23:37 1991 (Mark Seaman) marks@hpgrlt
 * Language:     C
 * Package:      N/A
 * Status:       Experimental (Do Not Distribute)
 *
 * (c) Copyright 1989, Hewlett-Packard Company.
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 ** http://www.apache.org/licenses/LICENSE-2.0
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 *
 *********************************************************************************/
#include "render.h"
#include "blobs.h"

#ifdef __UNIX__
#include <assert.h>
#endif
#include <math.h>

#include "vecfuncs.h"
#include "debug.h"

/*----------------------------------------------------------------------
              V a r i a b l e s
----------------------------------------------------------------------*/
void *blob_window = NULL;

C_COL color_list[] = {
  Red, Cyan, Yellow, Blue, Green, White
};

make_toggle_var (display_all_blobs, 0, make_disp_all_blobs,
5, 1, toggle_blobs, "Display Blobs");

make_toggle_var (display_all_words, 0, make_disp_all_words,
5, 2, toggle_wdisp, "Display Words");

make_toggle_var (blob_pause, 0, make_blob_pause,
5, 6, toggle_pause, "Blob pause");

/*----------------------------------------------------------------------
              F u n c t i o n s
----------------------------------------------------------------------*/
/**********************************************************************
 * display_blob
 *
 * Macro to display blob in a window.
 **********************************************************************/
void display_blob(TBLOB *blob, C_COL color) { 
  void *window;
  TPOINT origin;
  /* Size of drawable */
  if (blob_window == NULL) {
    blob_window = c_create_window ("Blobs", 520, 10,
      500, 128, -1000.0, 1000.0, 0.0, 256.0);
  }
  else {
    c_clear_window(blob_window); 
  }

  window = blob_window;
  /* Render blob */
  blob_origin(blob, &origin); 

  render_blob(window, blob, origin, color); 
  /* Default zoom */
  c_make_current(window); 
}


/**********************************************************************
 * init_render_vars
 *
 * Initialize the render graphics menu items.
 **********************************************************************/
void init_render_vars() { 
  make_disp_all_blobs(); 
  make_disp_all_words(); 
  make_blob_pause(); 
}


/**********************************************************************
 * render_blob
 *
 * Create a list of line segments that represent the expanded outline
 * that was supplied as input.
 **********************************************************************/
void render_blob(void *window, TBLOB *blob, TPOINT origin, C_COL color) { 
  /* No outline */
  if (!blob)
    return;

  render_outline (window, blob->outlines, origin, color);
}


/**********************************************************************
 * render_edgepts
 *
 * Create a list of line segments that represent the expanded outline
 * that was supplied as input.
 **********************************************************************/
void render_edgepts(void *window, EDGEPT *edgept, C_COL color) { 
  float x = edgept->pos.x;
  float y = edgept->pos.y;
  EDGEPT *this_edge = edgept;

  if (!edgept)
    return;

  c_line_color_index(window, color); 
  c_move(window, x, y); 
  do {
    this_edge = this_edge->next;
    x = this_edge->pos.x;
    y = this_edge->pos.y;
    c_draw(window, x, y); 
  }
  while (edgept != this_edge);
}


/**********************************************************************
 * render_outline
 *
 * Create a list of line segments that represent the expanded outline
 * that was supplied as input.
 **********************************************************************/
void render_outline(void *window,
                    TESSLINE *outline,
                    TPOINT origin,
                    C_COL color) {
  /* No outline */
  if (!outline)
    return;
  /* Draw Compact outline */
  if (outline->loop)
    render_edgepts (window, outline->loop, color);
  /* Add on next outlines */
  render_outline (window, outline->next, origin, color);

  /* Add on child outlines */
  render_outline (window, outline->child, origin, Grey);
}