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⌂ ∞ ▽ Elite on the 6502

Charts: hm

[Commodore 64 version]

       Name: hm                                                      [Show more]
       Type: Subroutine
   Category: Charts
    Summary: Select the closest system and redraw the chart crosshairs

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * hyp calls hm
             * TT102 calls hm




 Set the system closest to galactic coordinates (QQ9, QQ10) as the selected
 system, redraw the crosshairs on the chart accordingly (if they are being
 shown), and, if this is not a space view, clear the bottom three text rows of
 the screen.



.hm

 JSR TT103              ; Draw small crosshairs at coordinates (QQ9, QQ10),
                        ; which will erase the crosshairs currently there

 JSR TT111              ; Select the system closest to galactic coordinates
                        ; (QQ9, QQ10)

 JSR TT103              ; Draw small crosshairs at coordinates (QQ9, QQ10),
                        ; which will draw the crosshairs at our current home
                        ; system

 JMP CLYNS              ; Clear the bottom three text rows of the upper screen,
                        ; and move the text cursor to the first cleared row

                        ; Return from the subroutine using a tail call