Routines
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BCB4: Draw the menu
Used by the routine at MENU.
Hands DISPLAY_TEXT_LIST, at the end of this routine, the menu's seven colours (MENU_COLOURS), positions and strings. Called at the start of the menu and on every pass of its loop (MENU).
DISPLAY_MENU BCB4 LD DE,MENU_COLOURS DE' = the colours
BCB7 EXX
BCB8 LD HL,MENU_XY HL = the positions, MENU_XY
BCBB LD DE,MENU_TEXT DE = the strings, MENU_TEXT
BCBE LD B,$07 seven lines
This entry point is used by the routine at WON.
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 WON.
DISPLAY_TEXT_LIST BCC0 EXX this string's colour into PRINT_ATTR, for PRINT_TEXT_SINGLE_COLOUR
BCC1 LD A,(DE)
BCC2 LD (PRINT_ATTR),A
BCC5 INC DE
BCC6 EXX
BCC7 PUSH BC L = x, H = y; HL moved on to the next pair and kept
BCC8 LD A,(HL)
BCC9 INC HL
BCCA INC HL
BCCB PUSH HL
BCCC DEC HL
BCCD LD H,(HL)
BCCE LD L,A
BCCF CALL PRINT_TEXT_SINGLE_COLOUR print it, and loop
BCD2 POP HL
BCD3 POP BC
BCD4 DJNZ DISPLAY_TEXT_LIST
BCD6 LD A,(FRAME_DRAWN) the first list since the screen-shown flag (FRAME_DRAWN) was cleared...
BCD9 AND A
BCDA RET NZ
BCDB INC A ...sets it...
BCDC LD (FRAME_DRAWN),A
BCDF 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 line changes without the screen being redrawn
BCE2 JP SHOW_BUFFER
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