Page 106 - Programming Microcontrollers in C

Structures 91

struct point p1;
struct point p2;
};

/* here is a function to make a circle */
struct circle make_circle ( struct point ct, int
rad )
{
struct circle temp;

temp.center = ct;
temp.radius = rad;
return temp;
}

/* some useful function like macros */
#define min(a,b) (((a)<(b)) ? (a) : (b))
#define abs(a) ((a)<0 ? -(a) : (a))
/* function prototypes */

void draw_rectangle(struct rect);
void draw_circle(struct circle);

int main ( void )
{
struct circle cir;
struct point center;
struct rect window = { {80,80},{600,400} };
int radius,xc,yc;
center.x = (window.p1.x+window.p2.x)/2;
center.y = (window.p1.y+window.p2.y)/2;

xc = abs(window.p1.x -window.p2.x)/2;
yc = abs(window.p1.y -window.p2.y)/2;
radius = min(xc,yc);

cir=make_circle(center,radius);