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Routines |
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| 35525 | PUSH AF | Store AF (A = y-coordinate of menu hand cursor) | ||||||
| 35526 | LD A,(23493) | Load A with x-coordinate of left edge of current window to draw (characters) | ||||||
| 35529 | ADD A,2 | Add 2, as menu hand cursor is two characters wide... | ||||||
| 35531 | LD C,A | ...and load into C (x-coordinate of start of row of text in menu) | ||||||
| 35532 | POP AF | Restore AF (A = y-coordinate of menu hand cursor) | ||||||
| 35533 | ADD A,5 | Add five (as the "finger" of the cursor naturally points five pixels below the cursor's actual position) | ||||||
| 35535 | CALL 28625 | Divide this new y-coordinate by eight to get y-coordinate in characters | ||||||
| 35538 | LD B,A | Load this y-coordinate into B | ||||||
| 35539 | LD A,(23456) | Load initial y-coordinate of top of hand cursor relative to current window, into A | ||||||
| 35542 | ADD A,B | Add this to y-coordinate of "finger" | ||||||
| 35543 | LD B,A | Load this into B, so that B now contains y-coordinate of "finger" relative to top of window (characters) | ||||||
| 35544 | LD A,(23494) | Load y-coordinate of top edge of current window into A | ||||||
| 35547 | ADD A,B | Add... | ||||||
| 35548 | INC A | ...then add one (for window frame at top) so we now have absolute y-coordinate of "finger" | ||||||
| 35549 | LD B,A | Load into B | ||||||
| 35550 | LD (23476),BC | Store coordinates at 23476 | ||||||
| 35554 | CALL 54148 | Point HL at attribute file address for character coordinates x=C, y=B | ||||||
| 35557 | LD A,(23493) | Load B with x-coordinate of left edge of current window to draw (characters)... | ||||||
| 35560 | LD B,A | ... | ||||||
| 35561 | LD A,(23495) | Load A with x-coordinate of right edge of current window... | ||||||
| 35564 | SUB B | ...and subtract x-coordinate of left edge to get width | ||||||
| 35565 | DEC A | Decrease width by one to take into account window frame width... | ||||||
| 35566 | LD B,A | ...and load into B | ||||||
| 35567 | LD A,(HL) | Load attribute at current position in attribute file into A | ||||||
| 35568 | AND 56 | Reset INK, BRIGHT and FLASH bits, preserving PAPER only | ||||||
| 35570 | RRCA | Shift PAPER bits into INK bit slots... | ||||||
| 35571 | RRCA | ... | ||||||
| 35572 | RRCA | ... | ||||||
| 35573 | LD C,A | Store this value (new INK colour) in C | ||||||
| 35574 | LD A,(HL) | Load attribute at current position in attribute file into A | ||||||
| 35575 | RLCA | Shift all bits right by three (i.e. INK bits now contain former PAPER colour)... | ||||||
| 35576 | RLCA | ... | ||||||
| 35577 | RLCA | ... | ||||||
| 35578 | AND 56 | Reset INK, BRIGHT and FLASH bits, preserving PAPER only (i.e. PAPER bits now contain former INK colour) | ||||||
| 35580 | OR C | Merge modified PAPER value back in, to give new attribute (i.e. swapped INK and PAPER colours)... | ||||||
| 35581 | LD C,A | ...and load into C | ||||||
| 35582 | LD A,(HL) | Load attribute at current position in attribute file into A | ||||||
| 35583 | AND 192 | Reset INK and PAPER bits, preserving BRIGHT and FLASH only... | ||||||
| 35585 | OR C | ...and merge in swapped INK and PAPER values | ||||||
| 35586 | LD (HL),A | Write this new attribute value back to the attribute file | ||||||
| 35587 | INC HL | Advance HL to next byte in attribute file | ||||||
| 35588 | DJNZ 35586 | Decrease B (remaining number of characters to invert) and loop back to 35586 for next character block | ||||||
| 35590 | RET | Return | ||||||
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