| ← CDE8 | Map | CE5F → |
CE27: Diamond behavior handler
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Per-frame behavior handler for the diamond. It homes toward ball A, so it chases the ball around the playfield. Its death payload is the face monster's (update_face_monster).
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Animation: the four diamond sprites ping-pong, each shown 4 game frames. Movement: each frame it points its heading at ball A. Then it avoids walls and advances one step.
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| update_diamond | CE27 | CALL inhabitant_react_state | Run the reaction-state step; carry skips the rest during a spawn or death animation. | ||||||||
| CE2A | RET C | ||||||||||
| CE2B | LD HL,anim_diamond | Animate from the diamond frame table (4 sprites, played forward and back). Wrap the animation frame at the table's end. | |||||||||
| CE2E | CALL advance_anim | ||||||||||
| CE31 | LD A,(IY+$0B) | ||||||||||
| CE34 | CP $0C | ||||||||||
| CE36 | JR C,diamond_steer | ||||||||||
| CE38 | LD (IY+$0B),$00 | ||||||||||
| diamond_steer | CE3C | LD B,$01 | Home: turn the heading toward ball A, so the diamond tracks the ball. | ||||||||
| CE3E | CALL head_toward_target | ||||||||||
| CE41 | CALL object_avoid_walls | Steer clear of the walls. | |||||||||
| CE44 | CALL move_object | Advance one step and publish the heading code. | |||||||||
| CE47 | CALL inhabitant_offscreen | Despawn at the far edge. | |||||||||
| CE4A | RET C | ||||||||||
| CE4B | LD B,$05 | Ball kill: it dies for 50 points, banked into the pending score. | |||||||||
| CE4D | CALL ball_kill | ||||||||||
| CE50 | RET C | ||||||||||
| CE51 | CALL overlap_sweep | The sweep hits: restart the animation and start the death sequence (no score). | |||||||||
| CE54 | OR A | ||||||||||
| CE55 | RET Z | ||||||||||
| CE56 | LD (IY+$0B),$00 | ||||||||||
| CE5A | LD (IY+$0C),$02 | ||||||||||
| CE5E | RET | ||||||||||
| ← CDE8 | Map | CE5F → |