keen: update start position
keen comes through the door, he doesn't drop in from the sky like that maniac duke nukem
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Vince Weaver
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fb1cf56ec9
commit
018f407828
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@ -42,11 +42,13 @@ Status:
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* 11223344 * 20000 * 5 * N *
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Level1:
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in png: X=80 to 543, Y=12 to 80 (tiles 4x4)
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x=0 to 116 Y=0..17
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start position: in png 88,65
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tile position = 0,5
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keen position = 2,24 (remember, tiles 2 bytes high)
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tilemap copies
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@ -60,25 +60,24 @@ keen_start:
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lda #1
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sta FIREPOWER
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; lda #2 ; draw twice (both pages)
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; sta UPDATE_STATUS
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; lda #7
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; sta HEALTH
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lda #4
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sta DRAW_PAGE
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lda #18
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; Level 1
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; start at 2,24 (remember tiles 2 bytes high even though 4 pixels)
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; but with reference to starting tilemap (0,5) should be
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; 2,8?
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lda #2
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sta KEEN_X
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lda #0
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lda #24
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sta KEEN_Y
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lda #1
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sta KEEN_DIRECTION
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; jsr update_status_bar
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;====================================
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; load level1 background
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;====================================
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@ -107,15 +106,14 @@ keen_start:
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;====================================
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; copy in tilemap subset
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;====================================
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; copies local 16x10 tilemap to $bc00
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; we start out assuming position is 28,0
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; we copy in full screen, 40x48 = 20x12 tiles
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; we start out assuming position is 0,5
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; note 16x10 is 32*40
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; if we want full screen it should be 40x48 = 20x12
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lda #28
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sta TILEMAP_X
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lda #0
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sta TILEMAP_X
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lda #5
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sta TILEMAP_Y
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jsr copy_tilemap_subset
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@ -128,10 +126,6 @@ keen_start:
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keen_loop:
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; copy over background
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; jsr gr_copy_to_current
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; draw tilemap
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jsr draw_tilemap
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@ -152,10 +146,6 @@ keen_loop:
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; jsr check_open_door
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; draw a status bar
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; jsr draw_status_bar
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jsr page_flip
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jsr handle_keypress
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@ -185,9 +175,6 @@ no_frame_oflo:
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jmp done_with_keen
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do_keen_loop:
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; delay
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@ -201,7 +188,7 @@ done_with_keen:
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bit KEYRESET ; clear keypress
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lda #LOAD_TITLE
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lda #LOAD_MARS
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sta WHICH_LOAD
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rts ; exit back
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@ -110,19 +110,32 @@ check_left:
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bne check_right
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left_pressed:
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;===============================
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; left pressed
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; if facing left, walk left
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; if facing right and walking, stop
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; if facing right and not walking, face left
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lda KEEN_DIRECTION
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cmp #$ff ; check if facing left
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bne face_left
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bne left_facing_right
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lda #1
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lda #4
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sta KEEN_WALKING
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jmp done_left_pressed
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face_left:
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lda #$ff
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sta KEEN_DIRECTION
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left_facing_right:
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lda KEEN_WALKING
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beq left_not_walking
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lda #0
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sta KEEN_WALKING
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beq done_left_pressed ; bra
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left_not_walking:
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lda #$ff
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sta KEEN_DIRECTION
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done_left_pressed:
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jmp done_keypress
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@ -131,25 +144,65 @@ check_right:
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cmp #'D'
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beq right_pressed
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cmp #$15 ; right key
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bne check_up
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bne check_jump_right
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;===============================
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; right pressed
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; if facing right, walk right
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; if facing left and walking, stop
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; if facing left and not walking, face right
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right_pressed:
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lda KEEN_DIRECTION
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cmp #$1 ; check if facing right
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bne face_right
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bne right_facing_left
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lda #1
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lda #4
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sta KEEN_WALKING
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jmp done_left_pressed
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face_right:
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lda #$1
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sta KEEN_DIRECTION
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right_facing_left:
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lda KEEN_WALKING
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beq right_not_walking
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lda #0
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sta KEEN_WALKING
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beq done_right_pressed ; bra
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right_not_walking:
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lda #$1
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sta KEEN_DIRECTION
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done_right_pressed:
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jmp done_keypress
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check_jump_right:
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cmp #'E'
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bne check_up
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jump_right:
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; jump
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lda KEEN_JUMPING
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bne done_right_pressed ; don't jump if already jumping
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lda KEEN_FALLING
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bne done_right_pressed ; don't jump if falling
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lda #JUMP_HEIGHT
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sta KEEN_JUMPING
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jsr jump_noise
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lda #1
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sta KEEN_DIRECTION
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lda #10
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sta KEEN_WALKING
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jmp done_keypress
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check_up:
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cmp #'W'
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beq up_pressed
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@ -14,7 +14,7 @@ TILE_COLS = 20
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move_keen:
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lda #0
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sta SUPPRESS_WALK
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sta SUPPRESS_WALK ; ????
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jsr keen_get_feet_location ; get location of feet
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@ -24,60 +24,64 @@ move_keen:
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jsr handle_jumping ; handle jumping
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lda KEEN_WALKING
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lda KEEN_WALKING ; if not walking, we're done
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beq done_move_keen
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lda SUPPRESS_WALK
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dec KEEN_WALKING ; decrement walk count
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lda SUPPRESS_WALK ; why????
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bne done_move_keen
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lda KEEN_DIRECTION
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lda KEEN_DIRECTION ; check direction
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bmi move_left
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lda KEEN_X
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cmp #22
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lda KEEN_X ; if X more than 22
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cmp #22 ; scroll screen rather than keen
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bcc keen_walk_right
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keen_scroll_right:
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clc
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clc ; location is 8:8 fixed point
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lda KEEN_XL
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adc #KEEN_SPEED
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adc #KEEN_SPEED ; add in speed
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sta KEEN_XL
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bcc skip_keen_scroll_right
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bcc skip_keen_scroll_right ; if carry out we scroll
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inc TILEMAP_X
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inc TILEMAP_X ; scroll screen to right
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jsr copy_tilemap_subset
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jsr copy_tilemap_subset ; update tilemap
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skip_keen_scroll_right:
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jmp done_move_keen
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keen_walk_right:
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lda KEEN_XL
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lda KEEN_XL ; get 8:8 fixed
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clc
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adc #KEEN_SPEED
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adc #KEEN_SPEED ; add in speed
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sta KEEN_XL
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bcc dwr_noflo
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inc KEEN_X
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bcc dwr_noflo ; if no overflow
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inc KEEN_X ; otherwise update X
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dwr_noflo:
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jmp done_move_keen
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move_left:
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lda KEEN_X
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lda KEEN_X ; get current X
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cmp #14
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bcs keen_walk_left
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bcs keen_walk_left ; bge ; if >=14 walk
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keen_scroll_left:
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keen_scroll_left: ; otherwise scroll
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sec
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sec ; 8.8 fixed point
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lda KEEN_XL
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sbc #KEEN_SPEED
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sta KEEN_XL
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bcs skip_keen_scroll_left
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dec TILEMAP_X
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dec TILEMAP_X ; scroll left
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jsr copy_tilemap_subset
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@ -151,7 +155,7 @@ collide_left_right:
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;===================
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lda KEEN_DIRECTION
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beq done_keen_collide
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beq done_keen_collide ; ?
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bmi check_left_collide
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