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#include "rect.h"
int rects_overlap(const Rect* a, const Rect* b) {
return
a->x + a->w > b->x &&
a->y + a->h > b->y &&
a->x < b->x + b->w &&
a->y < b->y + b->h;
}
int point_rect_overlap(const Rect* r, int px, int py) {
return
px >= r->x &&
py >= r->y &&
px <= r->x + r->w &&
py <= r->y + r->h;
}
Rect* rect_clip(Rect* r, const Rect* c) {
int n;
if ((n = c->x - r->x) > 0) {
r->w -= n;
r->x += n;
}
if ((n = c->y - r->y) > 0) {
r->h -= n;
r->y += n;
}
if ((n = r->x + r->w - (c->x + c->w)) > 0)
r->w -= n;
if ((n = r->y + r->h - (c->y + c->h)) > 0)
r->h -= n;
return r;
}
Rect* rect_clipr(Rect* r, const int* c) {
int n;
if ((n = c[0] - r->x) > 0) {
r->w -= n;
r->x += n;
}
if ((n = c[1] - r->y) > 0) {
r->h -= n;
r->y += n;
}
if ((n = r->x + r->w - c[2]) > 0)
r->w -= n;
if ((n = r->y + r->h - c[3]) > 0)
r->h -= n;
return r;
}
Rect* rect_clips(Rect* r, Rect* s, const Rect* c) {
int n;
if ((n = c->x - r->x) > 0) {
r->w -= n;
r->x += n;
s->w -= n;
s->x += n;
}
if ((n = c->y - r->y) > 0) {
r->h -= n;
r->y += n;
s->h -= n;
s->y += n;
}
if ((n = r->x + r->w - (c->x + c->w)) > 0) {
r->w -= n;
s->w -= n;
}
if ((n = r->y + r->h - (c->y + c->h)) > 0) {
r->h -= n;
s->h -= n;
}
return r;
}
Rect* rect_clipsr(Rect* r, Rect* s, const int* c) {
int n;
if ((n = c[0] - r->x) > 0) {
r->w -= n;
r->x += n;
s->w -= n;
s->x += n;
}
if ((n = c[1] - r->y) > 0) {
r->h -= n;
r->y += n;
s->h -= n;
s->y += n;
}
if ((n = r->x + r->w - c[2]) > 0) {
r->w -= n;
s->w -= n;
}
if ((n = r->y + r->h - c[3]) > 0) {
r->h -= n;
s->h -= n;
}
return r;
}
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