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⌂ ∞ Elite on the BBC Micro and NES

Drawing planets: PLS2

[BBC Micro disc version, Flight]

       Name: PLS2                                                    [Show more]
       Type: Subroutine
   Category: Drawing planets
    Summary: Draw a half-ellipse
  Deep dive: Drawing ellipses
             Drawing meridians and equators

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * PL9 (Part 2 of 3) calls PLS2




 Draw a half-ellipse, used for the planet's equator and meridian.



.PLS2

 LDA #31                \ Set TGT = 31, so we only draw half an ellipse
 STA TGT

                        \ Fall through into PLS22 to draw the half-ellipse