Routines
Prev: D519 Up: Map Next: D562
D52A: Animate Wave Start Sprites
Used by the routine at Animate_Wave_Start_Sequence.
Advances the wave start sprite animation by one frame. Renders each of the three sprite state entries via Draw_Clipped_Wide_Sprite, scrolls its Y-position down by 06 pixels and advances its X-position by its stored velocity. After 0E frames the closing sprite is drawn and the animation restarts via Initialise_Wave_Start_Sprites.
Animate_Wave_Start_Sprites D52A LD HL,$D50D Point to the first sprite state entry in Intro_Sprite_State.
D52D LD B,$03 Set the sprite entry loop counter to 03.
D52F LD A,($C531) Load Wave_Sprite_Frame_Counter into the animation frame counter.
D532 EXX Stash the frame counter in the shadow register.
D533 LD B,A
D534 EXX
Animate_Wave_Start_Sprites_Loop D535 PUSH HL Stash the sprite state pointer and loop counter on the stack.
D536 PUSH BC
D537 CALL Draw_Clipped_Wide_Sprite Render this sprite via Draw_Clipped_Wide_Sprite.
D53A POP BC Restore the loop counter and state pointer from the stack.
D53B POP HL
D53C INC HL Advance past the sprite identifier byte.
D53D LD A,(HL) Scroll the Y-position down by 06 pixels.
D53E ADD A,$06
D540 LD (HL),A
D541 INC HL Apply the X velocity to the X-position.
D542 LD A,(HL)
D543 INC HL
D544 ADD A,(HL)
D545 DEC HL
D546 LD (HL),A
D547 INC HL Advance to the next sprite state entry.
D548 INC HL
D549 DJNZ Animate_Wave_Start_Sprites_Loop Repeat for the next sprite entry.
D54B LD A,($C531) Decrement the animation frame counter.
D54E DEC A
D54F LD ($C531),A
D552 CP $01 Return if the animation is still running.
D554 RET NZ
Final frame: draw the closing sprite with bright white and restart.
D555 EXX Set the closing sprite attribute to bright white.
D556 LD B,$47
D558 EXX
D559 LD HL,$C4D3 Call Draw_Entity_Sprite using Intro_Closing_Sprite.
D55C CALL Draw_Entity_Sprite
D55F JP Initialise_Wave_Start_Sprites Reinitialise the animation and restart.
Prev: D519 Up: Map Next: D562