C Program To Create a Paint Brush

Code :
#include <string.h>
#include<complex.h>
#include <graphics.h>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <math.h>
#define MIN_X 83
#define MAX_X 629
#define MIN_Y 30
#define MAX_Y 409
#define MAX_BUTTONS 22 //total no of buttins available on the right 
side
of thr screen eg save etc
#define MAX_COLPAT 28 //total no of color patterns solid fill dashsed 
etc

// down words are the macros which define the action e.g marking or 
delete
etc

#define CLEAR      0
#define MARK_OP    8
#define CLIP_OP    10
#define TRANS_OP   11
#define ROTATE_OP 12
#define DELETE_OP 13
#define FLIP      14
#define MIRROR    15
#define LOAD_OP   16
#define SAVE_OP   17
#define SCALE_OP  18


/*intro()
{
system("c:project1");
sleep(3);
return 0;
}
#pragma startup intro 99*/

/*this structure defines the description of the each button eg the
start x ,y and end x,y of the button and the button no and descriptoin
about the working of the button*/
typedef struct button_desc
{
 int xmin,ymin,xmax,ymax;
 int button_no;
 char* desc;
}button;

button buttons[MAX_BUTTONS];//maximum no of buttons in case 22

/* the struct below defines the color buttons on the bottom of the
pa