diff options
Diffstat (limited to 'bunny.gbasm')
| -rw-r--r-- | bunny.gbasm | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/bunny.gbasm b/bunny.gbasm index eb4e574..c6a06de 100644 --- a/bunny.gbasm +++ b/bunny.gbasm @@ -1,4 +1,10 @@ Initialize_Bunny: + LD A, $05 + LD $mem_bunny_x, A + LD A, $04 + LD $mem_bunny_y, A + LD A, $08 + LD $reg_viewport_x, A LD A, $50 LD $mem_bunny_x_px, A LD A, $50 @@ -6,6 +12,7 @@ Initialize_Bunny: RET Move_Bunny: + LD C, $00 ; (bit 0 = has_scrolled) LD A, $mem_moving_sprite_direction CP $00 JR NZ, =Move_Bunny.check_direction @@ -13,7 +20,7 @@ Move_Bunny: LD A, $mem_button_direction LD $mem_moving_sprite_direction, A CP $00 - JR Z, =Move_Bunny.end + JP Z, =Move_Bunny.end Move_Bunny.check_direction: LD $mem_sprite_direction, A @@ -39,6 +46,7 @@ Move_Bunny: LD $mem_bunny_x_px, A JP =Move_Bunny.check_end_of_movement Move_Bunny.horizontal_px_move.scrolling_fallback: + SET 0, C LD A, $reg_viewport_x ADD B LD $reg_viewport_x, A @@ -55,6 +63,7 @@ Move_Bunny: LD $mem_bunny_y_px, A JP =Move_Bunny.check_end_of_movement Move_Bunny.vertical_px_move.scrolling_fallback: + SET 0, C LD A, $reg_viewport_y ADD B LD $reg_viewport_y, A @@ -74,12 +83,24 @@ Move_Bunny: JR NZ, =Move_Bunny.vertical_tile_move Move_Bunny.horizontal_tile_move: + BIT 0, C + JR Z, =Move_Bunny.horizontal_tile_move.move_viewport_end + LD A, $mem_viewport_x + ADD B + LD $mem_viewport_x, A + Move_Bunny.horizontal_tile_move.move_viewport_end: LD A, $mem_bunny_x ADD B LD $mem_bunny_x, A JP =Move_Bunny.end Move_Bunny.vertical_tile_move: + BIT 0, C + JR Z, =Move_Bunny.vertical_tile_move.move_viewport_end + LD A, $mem_viewport_y + ADD B + LD $mem_viewport_y, A + Move_Bunny.vertical_tile_move.move_viewport_end: LD A, $mem_bunny_y ADD B LD $mem_bunny_y, A @@ -88,11 +109,11 @@ Move_Bunny: RET Display_Bunny: ; X position in $81, Y position in $80 - LD A, $mem_bunny_x + LD A, $mem_viewport_x LD HL, $9840 CALL =Print_8bit - LD A, $mem_bunny_y + LD A, $mem_viewport_y LD HL, $9860 CALL =Print_8bit |