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- /* the low-order bit indicates a hole */
- #define HOLE 0x00000001L /* a conducting hole */
-
- /* traces radiating outward from a hole to a side or corner */
- #define HOLE_NORTH 0x00000002L /* upward */
- #define HOLE_NORTHEAST 0x00000004L /* upward and right */
- #define HOLE_EAST 0x00000008L /* to the right */
- #define HOLE_SOUTHEAST 0x00000010L /* downward and right */
- #define HOLE_SOUTH 0x00000020L /* downward */
- #define HOLE_SOUTHWEST 0x00000040L /* downward and left */
- #define HOLE_WEST 0x00000080L /* to the left */
- #define HOLE_NORTHWEST 0x00000100L /* upward and left */
-
- /* straight lines through the center */
- #define LINE_HORIZONTAL 0x00000002L /* left-to-right line */
- #define LINE_VERTICAL 0x00000004L /* top-to-bottom line */
-
- /* lines cutting across a corner, connecting adjacent sides */
- #define CORNER_NORTHEAST 0x00000008L /* upper right corner */
- #define CORNER_SOUTHEAST 0x00000010L /* lower right corner */
- #define CORNER_SOUTHWEST 0x00000020L /* lower left corner */
- #define CORNER_NORTHWEST 0x00000040L /* upper left corner */
-
- /* diagonal lines through the center */
- #define DIAG_NEtoSW 0x00000080L /* northeast to southwest */
- #define DIAG_SEtoNW 0x00000100L /* southeast to northwest */
-
- /* 135 degree angle side-to-far-corner lines */
- #define BENT_NtoSE 0x00000200L /* north to southeast */
- #define BENT_NtoSW 0x00000400L /* north to southwest */
- #define BENT_EtoSW 0x00000800L /* east to southwest */
- #define BENT_EtoNW 0x00001000L /* east to northwest */
- #define BENT_StoNW 0x00002000L /* south to northwest */
- #define BENT_StoNE 0x00004000L /* south to northeast */
- #define BENT_WtoNE 0x00008000L /* west to northeast */
- #define BENT_WtoSE 0x00010000L /* west to southeast */
-
- /* 90 degree corner-to-adjacent-corner lines */
- #define ANGLE_NEtoSE 0x00020000L /* northeast to southeast */
- #define ANGLE_SEtoSW 0x00040000L /* southeast to southwest */
- #define ANGLE_SWtoNW 0x00080000L /* southwest to northwest */
- #define ANGLE_NWtoNE 0x00100000L /* northwest to northeast */
-
- /* 45 degree angle side-to-near-corner lines */
- #define SHARP_NtoNE 0x00200000L /* north to northeast */
- #define SHARP_EtoNE 0x00400000L /* east to northeast */
- #define SHARP_EtoSE 0x00800000L /* east to southeast */
- #define SHARP_StoSE 0x01000000L /* south to southeast */
- #define SHARP_StoSW 0x02000000L /* south to southwest */
- #define SHARP_WtoSW 0x04000000L /* west to southwest */
- #define SHARP_WtoNW 0x08000000L /* west to northwest */
- #define SHARP_NtoNW 0x10000000L /* north to northwest */
-
- /* directions the cell can be reached from (point to previous cell) */
- #define FROM_NORTH 1
- #define FROM_NORTHEAST 2
- #define FROM_EAST 3
- #define FROM_SOUTHEAST 4
- #define FROM_SOUTH 5
- #define FROM_SOUTHWEST 6
- #define FROM_WEST 7
- #define FROM_NORTHWEST 8
- #define FROM_OTHERSIDE 9
-
- #define TOP 0
- #define BOTTOM 1
- #define EMPTY 0
- #define ILLEGAL -1
-