#include <stdint.h>
#include "../q.h"
-typedef enum {DIR_UP, DIR_DOWN} segment_dir_t;
-typedef enum {EVENT_CROSS, EVENT_END, EVENT_START, EVENT_HORIZONTAL} eventtype_t;
+//#define DEBUG
+#define CHECKS
+#define SPLAY
+
+typedef enum {DIR_UP, DIR_DOWN, DIR_UNKNOWN} 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 {
point_t a;
point_t b;
fillstyle_t*style;
+#ifdef DEBUG
+ int tmp;
+#endif
struct _edge *next;
} edge_t;
{
char is_filled;
int wind_nr;
- int num_polygons;
} windstate_t;
+/* TODO: maybe we should merge windcontext and windrule */
+typedef struct _windcontext
+{
+ int num_polygons;
+} windcontext_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);
+ windstate_t (*start)(windcontext_t* num_polygons);
+ windstate_t (*add)(windcontext_t*context, windstate_t left, fillstyle_t*edge, segment_dir_t dir, int polygon_nr);
fillstyle_t* (*diff)(windstate_t*left, windstate_t*right);
} windrule_t;
+#define SEGNR(s) ((s)?(s)->nr:-1)
+
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)
+ int32_t minx, maxx;
segment_dir_t dir;
fillstyle_t*fs;
fillstyle_t*fs_out;
+#ifdef CHECKS
char fs_out_ok;
+#endif
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;
-
+ char changed;
+
point_t 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))
+
+/* 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;
+typedef struct _gfxstroke {
+ segment_dir_t dir;
+ int num_points;
+ point_t*points;
+ fillstyle_t*fs;
+} gfxstroke_t;
+typedef struct _gfxcompactpoly {
+ double gridsize;
+ int num_strokes;
+ gfxstroke_t*strokes;
+} gfxcompactpoly_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, windrule_t*windrule);
+gfxpoly_t* gfxpoly_save(gfxpoly_t*poly, const char*filename);
+gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule, windcontext_t*context);
typedef struct _event {
eventtype_t type;
segment_t*s2;
} event_t;
+#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