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⌂ ∞ ▽ Elite on the BBC Micro and NES

Charts: hm

[BBC Micro disc version, Flight]

       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
 Variations: See code variations for this subroutine in the different versions
 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 column 1 on row 21, i.e.
                        \ the start of the top row of the three bottom rows

                        \ Return from the subroutine using a tail call