freeglut_font.cpp

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/*
 * freeglut_font.c
 *
 * Bitmap and stroke fonts displaying.
 *
 * Copyright (c) 1999-2000 Pawel W. Olszta. All Rights Reserved.
 * Written by Pawel W. Olszta, <olszta@sourceforge.net>
 * Creation date: Thu Dec 16 1999
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PAWEL W. OLSZTA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
 
#include <iostream>
 
#include "freeglut_minimal.h"
 
#define freeglut_return_if_fail(expr) \
  if (!(expr)) return;
#define freeglut_return_val_if_fail(expr, val) \
  if (!(expr)) return val;
 
namespace freeglut_minimal {
 
/*
 * Matches a font ID with a SFG_StrokeFont structure pointer.
 * This was changed to match the GLUT header style.
 */
static SFG_StrokeFont* fghStrokeByID(FontID font) {
  if (font == GLUT_STROKE_ROMAN) return (SFG_StrokeFont*)&fgStrokeRoman;
  if (font == GLUT_STROKE_MONO_ROMAN)
    return (SFG_StrokeFont*)&fgStrokeMonoRoman;
 
  std::cerr << "stroke font " << (int)font << " not found" << std::endl;
  return 0;
}
 
void glutStrokeString(FontID fontID, const char* string_) {
  const unsigned char* string = reinterpret_cast<const unsigned char*>(string_);
  unsigned char c;
  int i, j;
  float length = 0.0;
  SFG_StrokeFont* font;
  // FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeString" );
  font = fghStrokeByID(fontID);
  freeglut_return_if_fail(font);
  if (!string || !*string) return;
 
  /*
   * Step through the string, drawing each character.
   * A newline will simply translate the next character's insertion
   * point back to the start of the line and down one line.
   */
  while ((c = *string++))
    if (c < font->Quantity) {
      if (c == '\n') {
        glTranslatef(-length, -(float)(font->Height), 0.0);
        length = 0.0;
      } else /* Not an EOL, draw the bitmap character */
      {
        const SFG_StrokeChar* schar = font->Characters[c];
        if (schar) {
          const SFG_StrokeStrip* strip = schar->Strips;
 
          for (i = 0; i < schar->Number; i++, strip++) {
            glBegin(GL_LINE_STRIP);
            for (j = 0; j < strip->Number; j++)
              glVertex2f(strip->Vertices[j].X, strip->Vertices[j].Y);
 
            glEnd();
          }
 
          length += schar->Right;
          glTranslatef(schar->Right, 0.0f, 0.0f);
        }
      }
    }
}
 
/*
 * Return the width of a string drawn using a stroke font
 */
int glutStrokeLength(FontID fontID, const char* string_) {
  const unsigned char* string = reinterpret_cast<const unsigned char*>(string_);
  unsigned char c;
  float length = 0.0;
  float this_line_length = 0.0;
  SFG_StrokeFont* font;
  // FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeLength" );
  font = fghStrokeByID(fontID);
  freeglut_return_val_if_fail(font, 0);
  if (!string || !*string) return 0;
 
  while ((c = *string++))
    if (c < font->Quantity) {
      if (c == '\n') /* EOL; reset the length of this line */
      {
        if (length < this_line_length) length = this_line_length;
        this_line_length = 0.0;
      } else /* Not an EOL, increment the length of this line */
      {
        const SFG_StrokeChar* schar = font->Characters[c];
        if (schar) this_line_length += schar->Right;
      }
    }
  if (length < this_line_length) length = this_line_length;
  return (int)(length + 0.5);
}
 
/*
 * Returns the height of a stroke font
 */
GLfloat glutStrokeHeight(FontID fontID) {
  SFG_StrokeFont* font;
  // FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutStrokeHeight" );
  font = fghStrokeByID(fontID);
  freeglut_return_val_if_fail(font, 0.0);
  return font->Height;
}
 
}  // namespace freeglut_minimal
 
/*** END OF FILE ***/