Font Assignment

gistfile1.cpp

#include <stdlib.h>
#include <GLUT/glut.h>
#include <math.h>


/*************************
::: HELPER VARIABLES ::: *
*************************/

enum FONT_TYPE {
  BITMAP,
  STROKE
};


/************************************
::: HELPER FUNCTIONS DECLARATIONS ::: 
************************************/

void initWindow();
void initMenu();
void menu(int);
void display();
void printBitmap(GLfloat, GLfloat, char*);
void printStroke(GLfloat, GLfloat, char*);
void renderBitmapFont();
void renderStrokeFont();


/*****************************
::: MAIN PROGRAM EXECUTION ::: 
******************************/

int main(int argc, char** argv) {
  glutInit(&argc, argv);
  initWindow();
  initMenu();
  glutDisplayFunc(display);
  glutMainLoop();
  return 0;
}


/***************************************
::: HELPER FUNCTIONS IMPLEMENTATIONS ::: 
***************************************/

void initWindow() {
  glutInitDisplayMode(GLUT_RGBA | GLUT_DEPTH | GLUT_DOUBLE);
  glutInitWindowSize(800, 400);
  glutInitWindowPosition(0, 0);
  glutCreateWindow("Primitives");
}

void initMenu() {
  glutCreateMenu(menu);
  glutAttachMenu(GLUT_RIGHT_BUTTON);
  glutAddMenuEntry("Bitmap Font", BITMAP);
  glutAddMenuEntry("Stroke Font", STROKE);
}

void menu(int item) {
  glClear(GL_COLOR_BUFFER_BIT);

  switch (item) {
    case BITMAP:
      renderBitmapFont();
    break;
    case STROKE:
      renderStrokeFont();
    break;
    default:
    break;
  }
}

void display() {
  glClear(GL_COLOR_BUFFER_BIT);
  glMatrixMode(GL_PROJECTION);
  gluOrtho2D(-10.0, 10.0, -10.0, 10.0);
  glMatrixMode(GL_MODELVIEW);
  glColor3ub(255, 0, 0);
  glutSwapBuffers();
}

void printStroke(GLfloat x, GLfloat y, char* string) {
  glPushMatrix();
  glTranslatef(x, y, 0);
  glScalef(1/252.38, 1/152.38, 1/252.38);
  for (char* p = string; *p; p++) {
    glutStrokeCharacter(GLUT_STROKE_ROMAN, *p);
  }
  glPopMatrix();
}

void printBitmap(GLfloat x, GLfloat y, char* string) {
  glPushMatrix();
  glRasterPos2s(x, y);
  glScalef(1/152.38, 1/152.38, 1/152.38);
  for (char* p = string; *p; p++) {
    glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, *p);
  }
  glPopMatrix();
}

void renderBitmapFont() {
  printBitmap(-8.0, 2.0, "James the (not-anymore) Perm");
  printBitmap(-8.0, 0.0, "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
  printBitmap(-8.0, -2.0, "abcdefghijklmnopqrstuvwxyz");
  glutSwapBuffers();
}

void renderStrokeFont() {
 printStroke(-8.0, 2.0, "James the (not-anymore) Perm");
 printStroke(-8.0, 0.0, "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
 printStroke(-8.0, -2.0, "abcdefghijklmnopqrstuvwxyz");
 glutSwapBuffers();
}