7 typedef enum {DIR_UP, DIR_DOWN} segment_dir_t;
8 typedef enum {EVENT_CROSS, EVENT_END, EVENT_START, EVENT_HORIZONTAL} eventtype_t;
9 typedef enum {SLOPE_POSITIVE, SLOPE_NEGATIVE} slope_t;
11 typedef struct _point {
16 typedef struct _fillstyle {
20 typedef struct _edge {
27 typedef struct _windstate
34 typedef struct _windrule
36 windstate_t (*start)(int num_polygons);
37 windstate_t (*add)(windstate_t left, fillstyle_t*edge, segment_dir_t dir, int polygon_nr);
38 fillstyle_t* (*diff)(windstate_t*left, windstate_t*right);
41 typedef struct _segment {
45 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*right;
61 dict_t scheduled_crossings;
64 #define LINE_EQ(p,s) ((double)(s)->delta.y*(p).x - (double)(s)->delta.x*(p).y - (s)->k)
65 #define XPOS(s,ypos) ((s)->a.x + ceil(((s)->delta.x * (double)((ypos) - (s)->a.y)) / (s)->delta.y))
67 typedef struct _gfxpoly {
72 gfxpoly_t* gfxpoly_new(double gridsize);
73 char gfxpoly_check(gfxpoly_t*poly);
74 void gfxpoly_dump(gfxpoly_t*poly);
75 gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule);
77 typedef struct _event {