* rocks.c (hit_rocks): oops, had r(ight) where I should have had t(op).

(pixel_hit_rocks): added bucket validity checks.

diff --git a/rocks.c b/rocks.c
index 428c697..d395d5d 100644 (file)
--- a/rocks.c
+++ b/rocks.c
@@ -317,8 +317,8 @@ hit_rocks(float x, float y, struct shape *shape)
 
        if(hit_in_bucket(*bucket, x, y, shape)) return true;
        if(l && hit_in_bucket(*(bucket-1), x, y, shape)) return true;
 
        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(t && hit_in_bucket(*(bucket-bw), x, y, shape)) return true;
+       if(l && t && 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(r > l) {
                if(hit_in_bucket(*(bucket+1), x, y, shape)) return true;

@@ -345,12 +345,18 @@ pixel_hit_in_bucket(struct rock_struct *r, float x, float y)
 int
 pixel_hit_rocks(float x, float y)
 {
 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 && pixel_hit_in_bucket(*(bucket-1), x, y)) return true;
+       if(t && pixel_hit_in_bucket(*(bucket-bw), x, y)) return true;
+       if(l && t && pixel_hit_in_bucket(*(bucket-(bw+1)), x, y)) return true;
+       return false;

 }
 
 void
 }
 
 void