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Routines |
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Used by the routine at RunGame.
Shows the window of the panel that holds the sun or the moon, and the sun or moon in it. The sun and the moon go along an arc from pixel X coordinate 176 to 224, which is the height from the table at SunMoonHeights. When one of them gets to the end the other takes over, the player transforms, and each time the sun comes back a day is added and the day is shown on the panel. When 64 days have passed the game is over. Nothing is done when the final animation is under way.
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| DisplaySunMoonFrame | 50084 | LD A,(23491) | Fetch the flag that says the final animation has started from FinalAnimationFlag. | |||||
| 50087 | AND A | Test it. | ||||||
| 50088 | RET NZ | Return if the final animation has started. | ||||||
| 50089 | LD A,(IX+26) | Fetch the pixel X coordinate of the sun/moon. | ||||||
| 50092 | CP 225 | Jump to DisplaySunMoonFrame_Toggle if the sun/moon has got there. | ||||||
| 50094 | JR Z,DisplaySunMoonFrame_Toggle | |||||||
| 50096 | LD A,(IX+26) | Fetch the pixel X coordinate. | ||||||
| 50099 | ADD A,16 | Add 16 to it. | ||||||
| 50101 | LD HL,50240 | Point HL at SunMoonHeights. | ||||||
| 50104 | RRCA | Divide the number by four. | ||||||
| 50105 | RRCA | |||||||
| 50106 | AND %00001111 | Keep the lowest four bits. | ||||||
| 50108 | CALL AddAToHL | Find the address of the height. | ||||||
| 50111 | LD A,(HL) | Fetch the height. | ||||||
| 50112 | LD (IX+27),A | Set the pixel Y coordinate of the sun/moon. | ||||||
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Draw the window in the screen buffer, wiping what was there first.
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| DisplaySunMoonFrame_Draw | 50115 | LD BC,7942 | Set the number of lines to 31 and the number of bytes to 6. | |||||
| 50118 | LD HL,55562 | Point HL at ScreenBuffer_SunMoonWindow. | ||||||
| 50121 | PUSH BC | Stash the size of the window on the stack. | ||||||
| 50122 | PUSH HL | Stash the position of the window on the stack. | ||||||
| 50123 | LD A,C | Swap B and C, so that B is the width and C is the height. | ||||||
| 50124 | LD C,B | |||||||
| 50125 | LD B,A | |||||||
| 50126 | XOR A | Clear A. | ||||||
| 50127 | CALL FillWindow | Clear the window. | ||||||
| 50130 | CALL PrintSprite | Draw the sun/moon. | ||||||
| 50133 | LD IX,49115 | Point IX at PanelObject. | ||||||
| 50137 | LD (IX+7),0 | Clear the flags. | ||||||
| 50141 | LD (IX+0),90 | Set the graphic number to the left of the frame. | ||||||
| 50145 | LD (IX+26),184 | Set the pixel X coordinate to 184. | ||||||
| 50149 | LD (IX+27),0 | Set the pixel Y coordinate to 0. | ||||||
| 50153 | CALL PrintSprite | Draw the left of the frame. | ||||||
| 50156 | LD (IX+26),208 | Set the pixel X coordinate to 208. | ||||||
| 50160 | LD (IX+0),186 | Set the graphic number to the right of the frame. | ||||||
| 50164 | CALL PrintSprite | Draw the right of the frame. | ||||||
| 50167 | POP HL | Restore the position of the window from the stack. | ||||||
| 50168 | POP BC | Restore the size of the window from the stack. | ||||||
| 50169 | LD DE,22519 | Point DE at the position of the window on the display. | ||||||
| 50172 | JP CopyBlockToScreen | Copy the window from the screen buffer to the display. | ||||||
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The sun or the moon has gone round: change to the other one, which makes the player transform. Add a day when it is the sun that is coming back.
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| DisplaySunMoonFrame_Toggle | 50175 | LD A,(IX+0) | Fetch the graphic number of the sun/moon. | |||||
| 50178 | XOR %00000001 | Change the sun to the moon, or the moon to the sun. | ||||||
| 50180 | LD (IX+0),A | Set the graphic number of the sun/moon. | ||||||
| 50183 | CALL ColourSunMoon | Colour the sun/moon. | ||||||
| 50186 | LD (IX+26),176 | Set the pixel X coordinate of the sun/moon back to the start. | ||||||
| 50190 | LD A,1 | Get the value that sets a flag. | ||||||
| 50192 | LD (23473),A | Flag that the player has to transform at TransformFlag. | ||||||
| 50195 | LD A,(50253) | Fetch the graphic number of the sun/moon from SunMoonObject. | ||||||
| 50198 | AND %00000001 | Keep the lowest bit. | ||||||
| 50200 | RET NZ | Return if it is the moon. | ||||||
| DisplaySunMoonFrame_AddDay | 50201 | LD HL,23481 | Point HL at Days. | |||||
| 50204 | LD A,(HL) | Fetch it. | ||||||
| 50205 | ADD A,1 | Add one. | ||||||
| 50207 | DAA | Keep it as a BCD number. | ||||||
| 50208 | LD (HL),A | Store it. | ||||||
| 50209 | CP 64 | Jump to GameOver if they have all gone. | ||||||
| 50211 | JP Z,GameOver | |||||||
| 50214 | CALL PrintDays | Print the number of days. | ||||||
| 50217 | LD BC,120 | Set the position of the days on the panel. | ||||||
| 50220 | CALL CopyAreaToScreen | Copy the number of days from the screen buffer to the display. | ||||||
| 50223 | JP DisplaySunMoonFrame_Draw | Jump to DisplaySunMoonFrame_Draw. | ||||||
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