#include <stdint.h>
#include "../q.h"
-typedef enum {DIR_UP, DIR_DOWN, DIR_HORIZONTAL} segment_dir_t;
-typedef enum {EVENT_CROSS, EVENT_END, EVENT_HORIZONTAL, EVENT_START} eventtype_t;
+//#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;
typedef enum {SLOPE_POSITIVE, SLOPE_NEGATIVE} slope_t;
typedef struct _point {
int32_t y;
} point_t;
+typedef struct _fillstyle {
+ char is_filled;
+} fillstyle_t;
+
typedef struct _edge {
point_t a;
point_t b;
+ fillstyle_t*style;
+ int tmp;
struct _edge *next;
} edge_t;
+typedef struct _windstate
+{
+ char is_filled;
+ int wind_nr;
+ int num_polygons;
+} windstate_t;
+
+typedef struct _windrule
+{
+ windstate_t (*start)(int num_polygons);
+ windstate_t (*add)(windstate_t left, fillstyle_t*edge, segment_dir_t dir, int polygon_nr);
+ fillstyle_t* (*diff)(windstate_t*left, windstate_t*right);
+} windrule_t;
+
typedef struct _segment {
point_t a;
point_t b;
point_t delta;
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)
+ int minx, maxx;
+
segment_dir_t dir;
+ fillstyle_t*fs;
+ fillstyle_t*fs_out;
+ char fs_out_ok;
+
+ int polygon_nr;
+ windstate_t wind;
int nr;
+
+#ifdef SPLAY
+ struct _segment*parent;
+ struct _segment*leftchild;
+ struct _segment*rightchild;
+#endif
struct _segment*left;
struct _segment*right;
- int tmp;
+ char changed;
+
point_t pos;
- point_t new_point;
- point_t new_pos;
dict_t scheduled_crossings;
} segment_t;
#define LINE_EQ(p,s) ((double)(s)->delta.y*(p).x - (double)(s)->delta.x*(p).y - (s)->k)
-#define XPOS(s,ypos) ((s)->a.x + ceil(((s)->delta.x * (double)((ypos) - (s)->a.y)) / (s)->delta.y))
-typedef edge_t gfxpoly_t;
-gfxpoly_t* gfxpoly_new();
+/* x1 + ((x2-x1)*(y-y1)) / dy =
+ (x1*(y2-y1) + (x2-x1)*(y-y1)) / dy =
+ (x1*(y2-y) + x2 *(y-y1)) / dy =
+ (x1*y2 - x2*y1 + x2*y - y*x1) / dy =
+ (k + x2*y - x1*y) / dy
+ (k + dx*y) / dy
+*/
+//#define XPOS(s,ypos) ((s)->a.x + ((s)->delta.x * (double)((ypos) - (s)->a.y)) / (s)->delta.y)
+#define XPOS(s,ypos) (((s)->k + (double)(s)->delta.x*ypos) / (s)->delta.y)
+
+#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)(s2)->delta.x*ypos)*(s1)->delta.y)
+
+typedef struct _gfxpoly {
+ double gridsize;
+ edge_t*edges;
+} gfxpoly_t;
+
+void gfxpoly_fail(char*expr, char*file, int line, const char*function);
+
+gfxpoly_t* gfxpoly_new(double gridsize);
+char gfxpoly_check(gfxpoly_t*poly);
+int gfxpoly_size(gfxpoly_t*poly);
void gfxpoly_dump(gfxpoly_t*poly);
-gfxpoly_t* gfxpoly_process(gfxpoly_t*poly);
+gfxpoly_t* gfxpoly_save(gfxpoly_t*poly, const char*filename);
+gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule);
typedef struct _event {
eventtype_t type;
segment_t*s2;
} event_t;
-void segment_init(segment_t*s, int32_t x1, int32_t y1, int32_t x2, int32_t y2);
-segment_t*segment_new(int32_t x1, int32_t y1, int32_t x2, int32_t y2);
-void segment_insert_before(segment_t**list, segment_t*add);
+#ifndef CHECKS
+#ifdef assert
+#undef assert
+#endif
+#define assert(x)
+#else
+#define assert(x) ((x)?0:gfxpoly_fail(__STRING(x), __FILE__, __LINE__, __PRETTY_FUNCTION__))
+#endif
+
#endif