typedef struct point { int x,y; } point;
|
typedef struct point { int x,y; } point;
|
typedef struct rect { point pt1, pt2; } rect;
|
typedef struct rect { point pt1, pt2; } rect;
|
|
|
point addpoint(point p1, point p2) { /* add two points */
|
point addpoint(point p1, point p2) { /* add two points */
|
p1.x += p2.x;
|
p1.x += p2.x;
|
p1.y += p2.y;
|
p1.y += p2.y;
|
return p1;
|
return p1;
|
}
|
}
|
|
|
#define min(a, b) ((a) < (b) ? (a) : (b))
|
#define min(a, b) ((a) < (b) ? (a) : (b))
|
#define max(a, b) ((a) > (b) ? (a) : (b))
|
#define max(a, b) ((a) > (b) ? (a) : (b))
|
|
|
rect canonrect(rect r) { /* canonicalize rectangle coordinates */
|
rect canonrect(rect r) { /* canonicalize rectangle coordinates */
|
rect temp;
|
rect temp;
|
|
|
temp.pt1.x = min(r.pt1.x, r.pt2.x);
|
temp.pt1.x = min(r.pt1.x, r.pt2.x);
|
temp.pt1.y = min(r.pt1.y, r.pt2.y);
|
temp.pt1.y = min(r.pt1.y, r.pt2.y);
|
temp.pt2.x = max(r.pt1.x, r.pt2.x);
|
temp.pt2.x = max(r.pt1.x, r.pt2.x);
|
temp.pt2.y = max(r.pt1.y, r.pt2.y);
|
temp.pt2.y = max(r.pt1.y, r.pt2.y);
|
return temp;
|
return temp;
|
}
|
}
|
|
|
point makepoint(int x, int y) { /* make a point from x and y components */
|
point makepoint(int x, int y) { /* make a point from x and y components */
|
point p;
|
point p;
|
|
|
p.x = x;
|
p.x = x;
|
p.y = y;
|
p.y = y;
|
return p;
|
return p;
|
}
|
}
|
|
|
rect makerect(point p1, point p2) { /* make a rectangle from two points */
|
rect makerect(point p1, point p2) { /* make a rectangle from two points */
|
rect r;
|
rect r;
|
|
|
r.pt1 = p1;
|
r.pt1 = p1;
|
r.pt2 = p2;
|
r.pt2 = p2;
|
return canonrect(r);
|
return canonrect(r);
|
}
|
}
|
|
|
int ptinrect(point p, rect r) { /* is p in r? */
|
int ptinrect(point p, rect r) { /* is p in r? */
|
return p.x >= r.pt1.x && p.x < r.pt2.x
|
return p.x >= r.pt1.x && p.x < r.pt2.x
|
&& p.y >= r.pt1.y && p.y < r.pt2.y;
|
&& p.y >= r.pt1.y && p.y < r.pt2.y;
|
}
|
}
|
|
|
struct odd {char a[3]; } y = {'a', 'b', 0};
|
struct odd {char a[3]; } y = {'a', 'b', 0};
|
|
|
odd(struct odd y) {
|
odd(struct odd y) {
|
struct odd x = y;
|
struct odd x = y;
|
printf("%s\n", x.a);
|
printf("%s\n", x.a);
|
}
|
}
|
|
|
main() {
|
main() {
|
int i;
|
int i;
|
point x, origin = { 0, 0 }, maxpt = { 320, 320 };
|
point x, origin = { 0, 0 }, maxpt = { 320, 320 };
|
point pts[] = { -1, -1, 1, 1, 20, 300, 500, 400 };
|
point pts[] = { -1, -1, 1, 1, 20, 300, 500, 400 };
|
rect screen = makerect(addpoint(maxpt, makepoint(-10, -10)),
|
rect screen = makerect(addpoint(maxpt, makepoint(-10, -10)),
|
addpoint(origin, makepoint(10, 10)));
|
addpoint(origin, makepoint(10, 10)));
|
|
|
for (i = 0; i < sizeof pts/sizeof pts[0]; i++) {
|
for (i = 0; i < sizeof pts/sizeof pts[0]; i++) {
|
printf("(%d,%d) is ", pts[i].x,
|
printf("(%d,%d) is ", pts[i].x,
|
(x = makepoint(pts[i].x, pts[i].y)).y);
|
(x = makepoint(pts[i].x, pts[i].y)).y);
|
if (ptinrect(x, screen) == 0)
|
if (ptinrect(x, screen) == 0)
|
printf("not ");
|
printf("not ");
|
printf("within [%d,%d; %d,%d]\n", screen.pt1.x, screen.pt1.y,
|
printf("within [%d,%d; %d,%d]\n", screen.pt1.x, screen.pt1.y,
|
screen.pt2.x, screen.pt2.y);
|
screen.pt2.x, screen.pt2.y);
|
}
|
}
|
odd(y);
|
odd(y);
|
exit(0);
|
exit(0);
|
}
|
}
|
|
|
|
|
