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Routines |
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Used by the routines at HandleCake, HandleBatter, HandleMonster_Rising, HandlePikeAndTinCan, HandleHat, HandleClearedActor, HandleFallingCharlie, HandleSugar, HandleLevelIntroduction, HandleFlourShot, GamePlay_Start and MoveBouncingActor.
Erases the sprite from the position recorded by StoreEntity and draws it at the new position held by the actor. The old and the new sprite are processed together so that the screen lines which they share are updated in step.
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| DisplayEntity | 75CC | CALL PrepareActorSprite | Prepare the actor sprite using PrepareActorSprite. | |||||
| 75CF | EXX | Switch to the shadow registers. | ||||||
| 75D0 | CALL PrepareOldSprite | Prepare the old sprite using PrepareOldSprite. | ||||||
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Compare the vertical position of the old sprite with the new one.
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| DisplayEntity_Compare | 75D3 | LD A,($5F15) | Fetch the vertical co-ordinate of the old sprite (OldSprite_Y). | |||||
| 75D6 | SUB (IX+$02) | Subtract the new vertical co-ordinate. | ||||||
| 75D9 | JP Z,XORSpriteLoop_Remaining | Jump to XORSpriteLoop_Remaining if they are the same. | ||||||
| 75DC | JP M,DisplayEntity_NewLower | Jump to DisplayEntity_NewLower if the new sprite is lower down the screen. | ||||||
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The old sprite is lower down. Draw the rows of it which the new sprite does not cover first.
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| 75DF | LD C,A | Keep the number of rows in C. | ||||||
| 75E0 | LD A,($5F19) | Fetch the sprite rows remaining. | ||||||
| 75E3 | CP C | Compare with the number of rows. | ||||||
| 75E4 | JP C,XORSpriteLoop_Remaining | Jump to XORSpriteLoop_Remaining if the sprites do not overlap. | ||||||
| 75E7 | SUB C | Subtract the rows which are about to be drawn. | ||||||
| 75E8 | LD ($5F19),A | Update the number of rows remaining for the old sprite (OldSprite_RowsRemaining). | ||||||
| 75EB | JP XORSpriteLoop | Jump to XORSpriteLoop. | ||||||
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The new sprite is lower down. Draw the rows of it which the old sprite does not cover first.
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| DisplayEntity_NewLower | 75EE | EXX | Switch to the shadow registers. | |||||
| 75EF | NEG | Make the number of rows positive. | ||||||
| 75F1 | LD C,A | Keep the number of rows in C. | ||||||
| 75F2 | LD A,($5F1A) | Fetch the number of rows remaining for the actor sprite (ActorSprite_RowsRemaining). | ||||||
| 75F5 | CP C | Compare with the number of rows. | ||||||
| 75F6 | JP C,XORSpriteLoop_Restore | Jump to XORSpriteLoop_Restore if the sprites do not overlap. | ||||||
| 75F9 | SUB C | Subtract the rows which are about to be drawn. | ||||||
| 75FA | JP XORSpriteLoop_Continue | Jump to XORSpriteLoop_Continue. | ||||||
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View the equivalent code in;
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