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Routines |
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Removes the image of an entity that was saved by StoreEntity, by drawing it again (sprites are XORed onto the screen).
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| RemoveEntity | 9F56 | CALL PrepDraw23 | Prepare the old sprite with PrepDraw23. | |||||
| RemoveEntity_Prepared | 9F59 | EXX | Switch to the shadow registers. | |||||
| 9F5A | XOR A | A=00. | ||||||
| 9F5B | LD C,A | Keep zero as the number of rows of the new sprite in C. | ||||||
| 9F5C | LD ($5E19),A | Update the number of new sprite rows in New_Sprite_Row_Count. | ||||||
| 9F5F | LD A,($5E18) | Fetch the number of old sprite rows from Old_Sprite_Row_Count. | ||||||
| 9F62 | LD ($5E11),A | Update the sprite height in SpriteHeight. | ||||||
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Work out the width of the sprite in bytes. The code uses L from the shadow registers, which holds whatever an earlier routine left there.
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| 9F65 | LD A,L | A=L. | ||||||
| 9F66 | AND %00000111 | Keep only bits 0-2. | ||||||
| 9F68 | LD A,$02 | A=02. | ||||||
| 9F6A | JR Z,RemoveEntity_Width | Jump to RemoveEntity_Width if bits 0-2 were zero. | ||||||
| 9F6C | INC A | A=03. | ||||||
| RemoveEntity_Width | 9F6D | LD ($5E10),A | Write the width to SpriteWidth. | |||||
| 9F70 | EXX | Switch to the normal registers. | ||||||
| 9F71 | JP XORSpriteLoop | Jump to XORSpriteLoop to draw the sprites onto the screen. | ||||||
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View the equivalent code in;
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