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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 | 40790 | CALL PrepDraw23 | Prepare the old sprite with PrepDraw23. | |||||
| RemoveEntity_Prepared | 40793 | EXX | Switch to the shadow registers. | |||||
| 40794 | XOR A | A=0. | ||||||
| 40795 | LD C,A | Keep zero as the number of rows of the new sprite in C. | ||||||
| 40796 | LD (24089),A | Update the number of new sprite rows in New_Sprite_Row_Count. | ||||||
| 40799 | LD A,(24088) | Fetch the number of old sprite rows from Old_Sprite_Row_Count. | ||||||
| 40802 | LD (24081),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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| 40805 | LD A,L | A=L. | ||||||
| 40806 | AND %00000111 | Keep only bits 0-2. | ||||||
| 40808 | LD A,2 | A=2. | ||||||
| 40810 | JR Z,RemoveEntity_Width | Jump to RemoveEntity_Width if bits 0-2 were zero. | ||||||
| 40812 | INC A | A=3. | ||||||
| RemoveEntity_Width | 40813 | LD (24080),A | Write the width to SpriteWidth. | |||||
| 40816 | EXX | Switch to the normal registers. | ||||||
| 40817 | 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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