bucket = &rock_buckets[p][l + t*bw];
if(hit_in_bucket(*bucket, x, y, shape)) return true;
- if(l && hit_in_bucket(*(bucket-1), x, y, shape)) return true;
- if(r && hit_in_bucket(*(bucket-bw), x, y, shape)) return true;
- if(l && r && hit_in_bucket(*(bucket-(1+bw)), x, y, shape)) return true;
+ if(l > 0 && hit_in_bucket(*(bucket-1), x, y, shape)) return true;
+ if(t > 0 && hit_in_bucket(*(bucket-bw), x, y, shape)) return true;
+ if(l > 0 && t > 0 && hit_in_bucket(*(bucket-1-bw), x, y, shape)) return true;
if(r > l) {
if(hit_in_bucket(*(bucket+1), x, y, shape)) return true;
- if(hit_in_bucket(*(bucket+1-bw), x, y, shape)) return true;
+ if(t > 0 && hit_in_bucket(*(bucket+1-bw), x, y, shape)) return true;
}
- if(t > b) {
+ if(b > t) {
if(hit_in_bucket(*(bucket+bw), x, y, shape)) return true;
- if(hit_in_bucket(*(bucket+bw-1), x, y, shape)) return true;
+ if(l > 0 && hit_in_bucket(*(bucket-1+bw), x, y, shape)) return true;
}
- if(r > l && t > b && hit_in_bucket(*(bucket+bw+1), x, y, shape)) return true;
+ if(r > l && b > t && hit_in_bucket(*(bucket+1+bw), x, y, shape)) return true;
return false;
}
int
pixel_hit_rocks(float x, float y)
{
- struct rock_struct **b = bucket(x, y, p);
- if(pixel_hit_in_bucket(*b, x, y)) return 1;
- if(pixel_hit_in_bucket(*(b-1), x, y)) return 1;
- if(pixel_hit_in_bucket(*(b-bw), x, y)) return 1;
- if(pixel_hit_in_bucket(*(b-bw-1), x, y)) return 1;
- return 0;
+ int ix, iy;
+ int l, t;
+ struct rock_struct **bucket;
+
+ ix = x + grid_size; iy = y + grid_size;
+ l = ix / grid_size; t = iy / grid_size;
+ bucket = &rock_buckets[p][l + t*bw];
+ if(pixel_hit_in_bucket(*bucket, x, y)) return true;
+ if(l > 0 && pixel_hit_in_bucket(*(bucket-1), x, y)) return true;
+ if(t > 0 && pixel_hit_in_bucket(*(bucket-bw), x, y)) return true;
+ if(l > 0 && t > 0 && pixel_hit_in_bucket(*(bucket-1-bw), x, y)) return true;
+ return false;
}
void