//#define DEBUG
//#define CHECKS
+#define SPLAY
typedef enum {DIR_UP, DIR_DOWN} segment_dir_t;
typedef enum {EVENT_CROSS, EVENT_END, EVENT_CORNER, EVENT_START, EVENT_HORIZONTAL} eventtype_t;
windstate_t wind;
int nr;
+#ifdef SPLAY
+ struct _segment*parent;
+ struct _segment*leftchild;
+ struct _segment*rightchild;
+#endif
struct _segment*left;
struct _segment*right;
char changed;
#define XPOS_INT(s,ypos) ((int)ceil(XPOS((s),ypos)))
#define XDIFF(s1,s2,ypos) (((s1)->k + (double)(s1)->delta.x*ypos)*(s2)->delta.y - \
- ((s2)->k + (double)(s1)->delta.x*ypos)*(s1)->delta.y)
-
-// rewrite as XDIFF==0?
-#define XPOS_EQ(s1,s2,ypos) (XPOS((s1),(ypos))==XPOS((s2),(ypos)))
+ ((s2)->k + (double)(s2)->delta.x*ypos)*(s1)->delta.y)
typedef struct _gfxpoly {
double gridsize;