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Routines |
| Prev: 41633 | Up: Map | Next: 41961 |
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Used by the routine at 41211.
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| 41767 | CALL 41961 | Update state of cannon's projectile | ||
| 41770 | LD IX,45508 | Load IX with address of complex state data for cannon (level 4) | ||
| 41774 | BIT 2,(IX+9) | If cannon's just-loaded flag is reset... | ||
| 41778 | JR Z,41805 | ...then skip ahead to 41805 | ||
| 41780 | DEC (IX+12) | Decrease cannon's fire timer... | ||
| 41783 | JR Z,41791 | ...and if now zero then skip ahead to 41791 | ||
| 41785 | LD BC,42519 | Set cannon's graphic layout data address to point to graphic layout data for cannon (rocking) and return... | ||
| 41788 | JP 42512 | ... | ||
| 41791 | RES 2,(IX+9) | Reset cannon's just-loaded flag | ||
| 41795 | LD (IX+12),50 | Set cannon's fire timer to 50 | ||
| 41799 | LD BC,42530 | Set cannon's graphic layout data address to point to graphic layout data for cannon (dormant) and return... | ||
| 41802 | JP 42512 | ... | ||
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Cannon's just-loaded flag is reset, so cannon has finished its rocking phase.
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| 41805 | LD A,(34209) | If cannon has no ammunition... | ||
| 41808 | OR A | ... | ||
| 41809 | JR Z,41799 | ...then jump to 41799 (cannon dormant) | ||
| 41811 | BIT 5,(IX+10) | If cannon has its is-being-carried flag set... | ||
| 41815 | JR NZ,41799 | ...then jump to 41799 (cannon dormant) | ||
| 41817 | LD IY,(34240) | Load IY with address of current level's complex state data for Berk | ||
| 41821 | LD A,(IX+0) | If Berk's current room is the same as the cannon's room... | ||
| 41824 | CP (IY+0) | ... | ||
| 41827 | JR Z,41833 | ...then skip ahead to 41833 | ||
| 41829 | JR C,41860 | If index of Berk's current room is greater than the index of the cannon's room then skip ahead to 41860 | ||
| 41831 | JR 41871 | Skip ahead to 41871 | ||
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Berk and cannon in same room
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| 41833 | LD A,(IX+7) | If x-coordinate of cannon's right side is smaller than x-coordinate of Berk's left side (i.e. cannon is to left of Berk)... | ||
| 41836 | CP (IY+5) | ... | ||
| 41839 | JR C,41860 | ...then skip ahead to 41860 | ||
| 41841 | LD A,(IY+7) | If x-coordinate of Berk's right side is smaller than x-coordinate of cannon's left side (i.e. cannon is to right of Berk)... | ||
| 41844 | CP (IX+5) | ... | ||
| 41847 | JR C,41871 | ...then skip ahead to 41871 | ||
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Berk and cannon overlapping horizontally
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| 41849 | LD E,1 | Load E with 1 (as projectile will appear one character to the right of the cannon's coordinate position) | ||
| 41851 | LD (IX+9),0 | Prepare to set projectile's state to zero (fired vertically) | ||
| 41855 | LD BC,42530 | Load BC with graphic layout data address for cannon (upright) | ||
| 41858 | JR 41880 | Skip ahead to 41880 | ||
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Berk is to the right of the cannon
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| 41860 | LD (IX+9),1 | Prepare to set projectile's state to 1 (fired left) | ||
| 41864 | LD E,2 | Load E with 2 (as projectile will appear two characters to the right of the cannon's coordinate position) | ||
| 41866 | LD BC,42556 | Load BC with graphic layout data address for cannon (tilted right) | ||
| 41869 | JR 41880 | Skip ahead to 41880 | ||
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Berk is to the left of the cannon
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| 41871 | LD (IX+9),2 | Prepare to set projectile's state to 2 (fired right) | ||
| 41875 | LD BC,42594 | Load BC with graphic layout data address for cannon (tilted left) | ||
| 41878 | LD E,0 | Load E with 0 (as projectile will appear at the same x-coordinate as in the cannon's coordinate position) | ||
| 41880 | CALL 42512 | Set cannon's graphic layout data address to value in BC | ||
| 41883 | LD A,(IX+1) | If cannon's depth is 2... | ||
| 41886 | CP 2 | ... | ||
| 41888 | RET Z | ...then return (cannon won't fire if it is placed behind Berk) | ||
| 41889 | LD A,(IX+12) | If cannon's fire timer is at zero... | ||
| 41892 | OR A | ... | ||
| 41893 | JR Z,41899 | ...then skip ahead to 41899 | ||
| 41895 | DEC (IX+12) | Decrease cannon's fire timer | ||
| 41898 | RET | Return | ||
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Cannon's fire timer is at zero
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| 41899 | LD HL,34209 | Decrease ammunition level of cannon (level 4) by one... | ||
| 41902 | DEC (HL) | ... | ||
| 41903 | LD (IX+12),50 | Set cannon's fire timer to 50 | ||
| 41907 | LD IY,45599 | Load IY with address of complex state data for cannon's projectile | ||
| 41911 | LD A,(IX+5) | Set x-coordinate of projectile's left and right sides to E plus x-coordinate of cannon's left side... | ||
| 41914 | ADD A,E | ... | ||
| 41915 | LD (IY+5),A | ... | ||
| 41918 | LD (IY+7),A | ... | ||
| 41921 | LD A,(IX+4) | Set y-coordinates of top and bottom of projectile to be one less than cannon's top y-coordinate... | ||
| 41924 | DEC A | ... | ||
| 41925 | LD (IY+4),A | ... | ||
| 41928 | LD (IY+6),A | ... | ||
| 41931 | LD A,(IX+0) | Set projectile's room to same as cannon's room... | ||
| 41934 | LD (IY+0),A | ... | ||
| 41937 | LD (IY+1),1 | Set projectile's depth to 1 | ||
| 41941 | LD A,(IX+9) | Set projectile's state to value prepared previously... | ||
| 41944 | LD (IY+9),A | ... | ||
| 41947 | LD (IY+12),251 | Set projectile's y-velocity to -5 | ||
| 41951 | LD BC,51483 | Set projectile's graphic layout data address to that for explosion (Bubo's projectile / fallen drips, level 4)... | ||
| 41954 | LD (IY+2),C | ...as projectile is launched from cannon in an explosion... | ||
| 41957 | LD (IY+3),B | ... | ||
| 41960 | RET | Return | ||
| Prev: 41633 | Up: Map | Next: 41961 |