Routines
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8666: Draw Menu Option
Used by the routines at RunTitleMenu and DrawMenuOptions.
Draws one option marker, in bright white if it is the selected option or in bright magenta otherwise.
Input
HL Pixel position of the option marker
DrawMenuOption 8666 LD B,$43 Use bright magenta as the default attribute.
8668 LD A,($9A64) Fetch the frame counter from FrameCounter.
866B AND %00000100 Test bit 2.
866D JR Z,DrawMenuOption_Fill Jump to DrawMenuOption_Fill if it is clear.
866F LD A,H Turn the Y position into the option number in C.
8670 SUB $2F
8672 LD C,A
8673 SRL C
8675 SRL C
8677 SRL C
8679 SRL C
867B LD A,($F2E2) Fetch the selected option from TwoPlayerFlag.
867E CP C Is this the selected option?
867F JR NZ,DrawMenuOption_Fill Jump to DrawMenuOption_Fill if not.
8681 LD B,$47 Use bright white for the selected option instead.
DrawMenuOption_Fill 8683 LD A,B Store the attribute in the data at DrawMenuOption_Attributes.
8684 LD ($868F),A
8687 LD DE,$868D Use the attribute data.
868A JP FillAttributes Jump to FillAttributes.
DrawMenuOption_Attributes 868D DEFB $09,$01,$00
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