The PrintBestLapTime subroutine - Revs on the BBC Micro

       Name: PrintBestLapTime                                        [Show more]
       Type: Subroutine
   Category: Text
    Summary: Print the best lap time and the current lap time at the top of the
             screen
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * ResetVariables calls PrintBestLapTime
             * UpdateLapTimers calls PrintBestLapTime


.PrintBestLapTime

 LDX #32                \ Move the cursor to character column 32 (to just after
 STX xCursor            \ "Best time" in token 40)

 INX                    \ Move the cursor to pixel row 33 (i.e. the second text
 STX yCursor            \ line at the top of the screen)

 LDX currentPlayer      \ Set X to the driver number of the current player, so
                        \ the call to PrintTimer prints the lap time for the
                        \ current driver

 LDA #%00100110         \ Print the best lap time for driver X in the following
 JSR PrintTimer         \ format:
                        \
                        \   * %00 Minutes: No leading zeroes, print both digits
                        \   * %10 Seconds: Leading zeroes, print both digits
                        \   * %0  Tenths: Print tenths of a second
                        \   * %11 Tenths: Leading zeroes, no second digit

                        \ Fall through into PrintLapTime to print the current
                        \ lap time at the top of the screen

[X]

Subroutine PrintTimer (category: Text)

Print the specified timer

[X]

Variable currentPlayer in workspace Zero page

The number of the current player

[X]

Variable xCursor (category: Text)

The cursor's x-coordinate, which can either be a pixel coordinate or a character row

[X]

Variable yCursor (category: Text)

The cursor's pixel y-coordinate