Routines
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BC25: Draw the menu
Used by the routine at MENU.
Hands DISPLAY_TEXT_LIST, the rest of this routine, the menu's eight colours (MENU_COLOURS), positions and strings. Called at the start of the menu and on every pass of its loop (MENU).
DISPLAY_MENU BC25 LD DE,MENU_COLOURS DE' = the colours
BC28 EXX
BC29 LD HL,MENU_XY HL = the positions, MENU_XY
BC2C LD DE,MENU_TEXT DE = the strings, MENU_TEXT
BC2F LD B,$08 eight lines
This entry point is used by the routines at GAME_ENDED and ARRIVAL_SCREEN.
Print a list of strings. B how many; DE' their colours, a byte each; HL their positions, an (x, y) pair each; DE the strings, end to end. Also used by the summary (GAME_ENDED) and the arrival screen (ARRIVAL_SCREEN).
DISPLAY_TEXT_LIST BC31 EXX this string's colour into PRINT_ATTR, for PRINT_TEXT_SINGLE_COLOUR
BC32 LD A,(DE)
BC33 LD (PRINT_ATTR),A
BC36 INC DE
BC37 EXX
BC38 PUSH BC L = x, H = y; HL moved on to the next pair and kept
BC39 LD A,(HL)
BC3A INC HL
BC3B INC HL
BC3C PUSH HL
BC3D DEC HL
BC3E LD H,(HL)
BC3F LD L,A
BC40 CALL PRINT_TEXT_SINGLE_COLOUR print it, and loop
BC43 POP HL
BC44 POP BC
BC45 DJNZ DISPLAY_TEXT_LIST
BC47 LD A,(TEXT_SHOWN) the first list since TEXT_SHOWN was cleared...
BC4A AND A
BC4B RET NZ
BC4C INC A ...sets it...
BC4D LD (TEXT_SHOWN),A
BC50 CALL PRINT_BORDER ...draws the border (PRINT_BORDER) and shows the whole buffer (SHOW_BUFFER); later lists only redraw into the buffer and write the attributes, which is how the menu's flashing lines change without the screen being redrawn
BC53 JP SHOW_BUFFER
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