11 #define DONT_REMEMBER_CROSSINGS
13 typedef enum {EVENT_CROSS, EVENT_END, EVENT_START, EVENT_HORIZONTAL} eventtype_t;
14 typedef enum {SLOPE_POSITIVE, SLOPE_NEGATIVE} slope_t;
16 #define INVALID_COORD (0x7fffffff)
17 typedef struct _point {
23 #define SEGNR(s) ((int)((s)?(s)->nr:-1))
25 typedef struct _gfxpolystroke {
31 struct _gfxpolystroke*next;
33 typedef struct _gfxpoly {
35 gfxpolystroke_t*strokes;
38 typedef struct _segment {
42 double k; //k = a.x*b.y-a.y*b.x = delta.y*a.x - delta.x*a.y (=0 for points on the segment)
57 struct _segment*parent;
58 struct _segment*leftchild;
59 struct _segment*rightchild;
62 struct _segment*right;
67 gfxpolystroke_t*stroke;
70 #ifndef DONT_REMEMBER_CROSSINGS
71 dict_t scheduled_crossings;
75 #define LINE_EQ(p,s) ((double)(s)->delta.y*(p).x - (double)(s)->delta.x*(p).y - (s)->k)
77 /* x1 + ((x2-x1)*(y-y1)) / dy =
78 (x1*(y2-y1) + (x2-x1)*(y-y1)) / dy =
79 (x1*(y2-y) + x2 *(y-y1)) / dy =
80 (x1*y2 - x2*y1 + x2*y - y*x1) / dy =
81 (k + x2*y - x1*y) / dy
84 //#define XPOS(s,ypos) ((s)->a.x + ((s)->delta.x * (double)((ypos) - (s)->a.y)) / (s)->delta.y)
85 #define XPOS(s,ypos) (((s)->k + (double)(s)->delta.x*ypos) / (s)->delta.y)
87 #define XPOS_INT(s,ypos) ((int)ceil(XPOS((s),ypos)))
88 #define XDIFF(s1,s2,ypos) (((s1)->k + (double)(s1)->delta.x*ypos)*(s2)->delta.y - \
89 ((s2)->k + (double)(s2)->delta.x*ypos)*(s1)->delta.y)
91 void gfxpoly_fail(char*expr, char*file, int line, const char*function);
93 char gfxpoly_check(gfxpoly_t*poly, char updown);
94 int gfxpoly_num_segments(gfxpoly_t*poly);
95 int gfxpoly_size(gfxpoly_t*poly);
96 void gfxpoly_dump(gfxpoly_t*poly);
97 void gfxpoly_save(gfxpoly_t*poly, const char*filename);
98 void gfxpoly_save_arrows(gfxpoly_t*poly, const char*filename);
99 gfxpoly_t* gfxpoly_process(gfxpoly_t*poly1, gfxpoly_t*poly2, windrule_t*windrule, windcontext_t*context);
101 gfxpoly_t* gfxpoly_intersect(gfxpoly_t*p1, gfxpoly_t*p2);
102 gfxpoly_t* gfxpoly_union(gfxpoly_t*p1, gfxpoly_t*p2);
110 #define assert(x) ((x)?0:gfxpoly_fail(__STRING(x), __FILE__, __LINE__, __PRETTY_FUNCTION__))