/*----------------------------------------------------------

  Elizabeth Sklar
  Assignment #3
  MC140.0X
  2 October 2000

  This program prints out graphical objects (using ASCII
  graphics), based on input from the user. The user selects
  objects to print from a menu.

  This program is an extension of Assignment #2.
  It uses a grid in which to define graphical objects and
  determines mathematically which points should be marked
  to draw the graphical objects.

----------------------------------------------------------*/

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

#define MAX 21

char grid[MAX][MAX];




/*--------------------------------------------------------*/
/* initialize_grid                                        */
/*                                                        */
/* This function initializes the grid by drawing an axis  */
/* and setting all others points to the space character.  */
/*                                                        */
/*--------------------------------------------------------*/
void initialize_grid() {


} /* end of initialize_grid() */


/*--------------------------------------------------------*/
/* print_grid                                             */
/*                                                        */
/* This function prints the grid.                         */
/*                                                        */
/*--------------------------------------------------------*/
void print_grid() {


} /* end of print_grid() */


/*--------------------------------------------------------*/
/* get_option                                             */
/*                                                        */
/* This function prints the menu and gets the user's      */
/* choice of what to do.                                  */
/*                                                        */
/*--------------------------------------------------------*/
char get_option() {

  char tmp[2];

  printf( "R (draw rectangle)\n" );
  printf( "T (draw triangle)\n" );
  printf( "C (draw circle)\n" );
  printf( "Q (quit)\n" );
  printf( "enter option: " );
  scanf( "%s",tmp );

  return( tmp[0] );

} /* end of get_option() */


/*--------------------------------------------------------*/
/* draw_rectangle                                         */
/*                                                        */
/* This function draws a rectangle. The user is asked to  */
/* specify the height and width of the rectangle.         */
/*                                                        */
/*--------------------------------------------------------*/
void draw_rectangle() {


  // ask user for dimensions
  .
  .
  .

  // initialize grid for drawing
  initialize_grid();

  // plot the rectangle in the grid
  .
  .
  .

  // display the grid
  print_grid();

} /* end of draw_rectangle() */


/*--------------------------------------------------------*/
/* draw_triangle                                          */
/*                                                        */
/* This function draws an upright right triangle, with    */
/* its right corner at the origin. The user is asked to   */
/* specify the height and width of the triangle.          */
/*                                                        */
/*--------------------------------------------------------*/
void draw_triangle() {


  // ask user for dimensions
  .
  .
  .

  // initialize the grid
  initialize_grid();

  // plot the triangle in the grid
  .
  .
  .

  // display the grid
  print_grid();

} /* end of draw_triangle() */


/*--------------------------------------------------------*/
/* draw_circle                                            */
/*                                                        */
/* This function draws a circle. The user is asked to     */
/* specify the radius of the circle.                      */
/*                                                        */
/*--------------------------------------------------------*/
void draw_circle() {


  // ask user for dimensions
  .
  .
  .

  // initialize the grid
  initialize_grid();

  // plot the circle in the grid
  .
  .
  .

  // display the grid
  print_grid();

} /* end of draw_circle() */

/*--------------------------------------------------------*/
/* quit                                                   */
/*                                                        */
/* This function displays a goodbye message to the user.  */
/*                                                        */
/*--------------------------------------------------------*/
void quit() {

  printf( "Thanks for playing!\n" );

} /* end of quit() */


/*--------------------------------------------------------*/
/* main program                                           */
/*                                                        */
/*--------------------------------------------------------*/
void main() {

  char option = ' ';

  while ( option != 'Q' ) {
    option = get_option();
    if ( option == 'R' ) {
      draw_rectangle();
    }
    else if ( option == 'T' ) {
      draw_triangle();
    }
    else if ( option == 'C' ) {
      draw_circle();
    }
    else if ( option != 'Q' ) {
      printf( "Invalid option.\n" );
    }
  } /* end of while */

  quit();

} /* end of main() */