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A C64 Game - Step 80

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Did you notice the huge door in the background? It's about time it opens!


That's actually pretty simple. At the jump-to-next level code we add a check. Whether the open door animation is shown depends on a bit in the LEVEL_CONFIG byte.
GoToNextLevel lda LEVEL_CONFIG and #$04 beq .NoDoorAnim jsr DoorAnim.NoDoorAnim

The actual animation is straight forward. The door location is hard coded, and we simply copy the characters one step to the outer side and replace the innermost characters with empty space.

Notice that we use a method which is not possible that easy in todays code: We have a local code loop until the door is completely opened.
Since there are no events to be handled, messages to be retrieved or other OS specific code required, we can do that.

;------------------------------------------------------------;open door animation;------------------------------------------------------------!zone DoorAnimDoorAnim lda #0 sta LEVEL_DONE_DELAY.DoorAnimLoop jsr WaitFrame inc LEVEL_DONE_DELAY lda LEVEL_DONE_DELAY and #$07 bne .DoorAnimLoop ;open door (16,11) lda #11 sta PARAM2 - ldy PARAM2 lda SCREEN_LINE_OFFSET_TABLE_LO,y sta ZEROPAGE_POINTER_1 lda SCREEN_LINE_OFFSET_TABLE_HI,y sta ZEROPAGE_POINTER_1 + 1 ldy #17 lda (ZEROPAGE_POINTER_1),y dey sta (ZEROPAGE_POINTER_1),y ldy #18 lda (ZEROPAGE_POINTER_1),y dey sta (ZEROPAGE_POINTER_1),y ldy #19 lda (ZEROPAGE_POINTER_1),y dey sta (ZEROPAGE_POINTER_1),y lda #32 ldy #19 sta (ZEROPAGE_POINTER_1),y ldy #22 lda (ZEROPAGE_POINTER_1),y iny sta (ZEROPAGE_POINTER_1),y ldy #21 lda (ZEROPAGE_POINTER_1),y iny sta (ZEROPAGE_POINTER_1),y ldy #20 lda (ZEROPAGE_POINTER_1),y iny sta (ZEROPAGE_POINTER_1),y lda #32 ldy #20 sta (ZEROPAGE_POINTER_1),y inc PARAM2 lda PARAM2 cmp #21 bne - ; lda LEVEL_DONE_DELAY lsr lsr lsr cmp #4 bne .DoorAnimLoop ;door is fully open now- jsr WaitFrame inc LEVEL_DONE_DELAY lda LEVEL_DONE_DELAY cmp #200 bne - rts

Also, since I'm going on vacation this tutorial takes a break until next year. Thanks for your support so far, have fun!

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Well, unfortunately you'll have to wait until next year.
Or look at the earlier served Retro Remakes site ;)

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