/* Program: pumpkin2.c
   Draw a pumpkin.
   Cleaned up version.
*/

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"
#include "graphics.h"

/* Use math library */
#include <math.h>
#define PI 3.1415926

#define PUMPKIN_SIZE 2.0
#define EYE_SIZE (PUMPKIN_SIZE/4.0)
#define PUMP_ANG 60.0  /* Pumpkin Angle */

/* Function Prototypes */
double deg2rad (double angle) ;
void DrawEye(void) ;

/* Convert degree to radians */

double deg2rad (double angle) {
  return (PI * angle / 180.0 ) ;
}

void DrawEye(void) {
  DrawLine(-EYE_SIZE/2, 0.0) ;
  DrawLine(EYE_SIZE/2, EYE_SIZE) ;
  DrawLine(EYE_SIZE/2, -EYE_SIZE) ;
  DrawLine(-EYE_SIZE/2, 0.0) ;
}


main() {
  double x, y, max_x, max_y ;
  double mid_x, mid_y, top, eye_offset ;
  double radius, start, sweep ;

  /* Initialize graphics routines */
  InitGraphics() ;
  max_x = GetWindowWidth() ;
  max_y = GetWindowHeight() ;
  mid_x = max_x / 2.0 ;
  mid_y = max_y / 2.0 ;
  top = mid_y + PUMPKIN_SIZE * sin(deg2rad(PUMP_ANG)) ;
  eye_offset = PUMPKIN_SIZE * cos(deg2rad(PUMP_ANG)) ;

  /*** Draw stem */
  MovePen(mid_x, top ) ;
  DrawLine(-PUMPKIN_SIZE/8.0, 3*PUMPKIN_SIZE/8.0);
  DrawLine(PUMPKIN_SIZE/4.0, 0.0 ) ;
  DrawLine(-PUMPKIN_SIZE/8.0, -3*PUMPKIN_SIZE/8.0);

  /*** Draw right side of pumpkin */
  MovePen(mid_x, top) ;
  start = 180.0 - PUMP_ANG ;
  sweep = 360.0 - 2 * PUMP_ANG ;
  DrawArc(PUMPKIN_SIZE, start, -sweep ) ; 

  /*** Draw left side of pumpkin */
  start = -PUMP_ANG ;
  DrawArc(PUMPKIN_SIZE, start, -sweep ) ; 

  /*** Draw Eyes */
  MovePen(mid_x + eye_offset, mid_y) ;
  DrawEye() ;
  MovePen(mid_x - eye_offset, mid_y) ;
  DrawEye() ;

  /* Draw Mouth */
  radius = PUMPKIN_SIZE / 2.0 ;
  start = 270.0 - PUMP_ANG ;
  sweep = 2 * PUMP_ANG ;
  x = mid_x + radius * cos(deg2rad(start)) ;
  y = mid_y + radius * sin(deg2rad(start)) ;
  MovePen(x,y) ;
  DrawArc(radius, start, sweep);
  radius = radius * sin(deg2rad(PUMP_ANG)) ;
  DrawArc(radius, 0.0, -180.0 ) ;
}