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⌂ ∞ Elite on the BBC Micro

Drawing lines: BOMBFX

[BBC Master version]

       Name: BOMBFX                                                  [Show more]
       Type: Subroutine
   Category: Drawing lines
    Summary: Erase the energy bomb zig-zag lightning bolt, make the sound of
             the energy bomb going off, draw a new bolt and repeat four times

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * Main flight loop (Part 13 of 16) calls BOMBFX




.BOMBFX

 JSR P%+3               \ This pair of JSRs runs the following code four times
 JSR P%+3

 LDY #6                 \ Call the NOISE routine with Y = 6 to make the sound of
 JSR NOISE              \ an energy bomb going off

 JSR BOMBLINES          \ Our energy bomb is going off, so call BOMBLINES to
                        \ draw the current zig-zag lightning bolt, which will
                        \ erase it from the screen

                        \ Fall through into BOMBINIT to set up and display a new
                        \ zig-zag lightning bolt