Routines
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C603: Choose a ghost's sprite from its direction
Used by the routine at ghost_new_direction.
A ghost has two views, chosen by bit 1 of its type, and each can be mirrored (bit 6 of +$07); together they give four directions. Whichever of dx and dy is larger in size decides: mostly along x, the view is mirrored; mostly along y, it is not. The sign then picks the view.
Input
IX the ghost's record
calc_ghost_sprite C603 LD A,(IX+$09) the size of dx
C606 AND A
C607 JP P,ghost_abs_dy
C60A NEG
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