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Routines |
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The handler for Charlie's hat (ID 0D), which is in Charlie's actor slot. Charlie's co-ordinates were saved in bytes 04 and 05 of the actor by LoseHat. Each pass the hat moves up two pixels, and Charlie is redrawn without his hat. When the hat reaches the top of the screen it is erased, and Charlie is replaced with falling Charlie (ID 0E), who is handled by HandleFallingCharlie.
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| HandleHat | 6AA0 | CALL StoreEntity | Record the position of the sprite using StoreEntity. | |||||
| 6AA3 | LD A,(IX+$02) | Fetch the vertical co-ordinate. | ||||||
| 6AA6 | SUB $02 | Subtract 02 to move the hat up the screen. | ||||||
| 6AA8 | JR C,HandleHat_Finished | Jump to HandleHat_Finished if the hat has reached the top of the screen. | ||||||
| 6AAA | LD (IX+$02),A | Update the vertical co-ordinate. | ||||||
| 6AAD | CALL DisplayEntity | Erase the sprite and draw it in its new position using DisplayEntity. | ||||||
| 6AB0 | CALL ColourSprite | Colour the sprite using ColourSprite. | ||||||
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Redraw Charlie without his hat, and then put the position of the hat back.
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| 6AB3 | LD L,(IX+$01) | Fetch the horizontal co-ordinate of the hat. | ||||||
| 6AB6 | LD H,(IX+$02) | Fetch the vertical co-ordinate of the hat. | ||||||
| 6AB9 | PUSH HL | Stash the position of the hat on the stack. | ||||||
| 6ABA | LD A,(IX+$04) | Fetch Charlie's horizontal co-ordinate (byte 04 of the actor). | ||||||
| 6ABD | LD (IX+$01),A | Update the horizontal co-ordinate. | ||||||
| 6AC0 | LD A,(IX+$05) | Fetch Charlie's vertical co-ordinate (byte 05 of the actor). | ||||||
| 6AC3 | LD (IX+$02),A | Update the vertical co-ordinate. | ||||||
| 6AC6 | LD (IX+$00),$0C | Change the ID to 0C (Charlie without his hat). | ||||||
| 6ACA | CALL StoreEntity | Record the position of the sprite using StoreEntity. | ||||||
| 6ACD | CALL DisplayEntity | Erase the sprite and draw it in its new position using DisplayEntity. | ||||||
| 6AD0 | CALL ColourSprite | Colour the sprite using ColourSprite. | ||||||
| 6AD3 | POP HL | Restore the position of the hat from the stack. | ||||||
| 6AD4 | LD (IX+$01),L | Put the hat back at its horizontal co-ordinate. | ||||||
| 6AD7 | LD (IX+$02),H | Put the hat back at its vertical co-ordinate. | ||||||
| 6ADA | LD (IX+$00),$0D | Change the ID back to 0D (the hat). | ||||||
| 6ADE | RET | Return. | ||||||
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The hat has reached the top of the screen, so erase it and replace Charlie with falling Charlie.
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| HandleHat_Finished | 6ADF | CALL DrawEntity | Erase the hat using DrawEntity. | |||||
| 6AE2 | LD A,(IX+$04) | Fetch Charlie's horizontal co-ordinate (byte 04 of the actor). | ||||||
| 6AE5 | LD (IX+$01),A | Update the horizontal co-ordinate. | ||||||
| 6AE8 | LD A,(IX+$05) | Fetch Charlie's vertical co-ordinate (byte 05 of the actor). | ||||||
| 6AEB | LD (IX+$02),A | Update the vertical co-ordinate. | ||||||
| 6AEE | LD (IX+$00),$0C | Change the ID to 0C (Charlie without his hat). | ||||||
| 6AF2 | CALL DrawEntity | Erase Charlie without his hat using DrawEntity. | ||||||
| 6AF5 | LD (IX+$00),$0E | Change the ID to 0E (falling Charlie). | ||||||
| 6AF9 | JP DrawEntity | Draw falling Charlie using DrawEntity. | ||||||
| Prev: 6A73 | Up: Map | Next: 6AFC |