#include <stdint.h>
#include "../q.h"
+//#define DEBUG
+#define CHECKS
+
typedef enum {DIR_UP, DIR_DOWN} segment_dir_t;
-typedef enum {EVENT_CROSS, EVENT_END, EVENT_HORIZONTAL, EVENT_START} eventtype_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;
+ int tmp;
struct _edge *next;
} edge_t;
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;
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;
+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_save(gfxpoly_t*poly, const char*filename);
gfxpoly_t* gfxpoly_process(gfxpoly_t*poly, windrule_t*windrule);
typedef struct _event {
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