Drawing lines: TWFL

       Name: TWFL                                                    [Show more]
       Type: Variable
   Category: Drawing lines
    Summary: Ready-made pixel bytes for the left end of a horizontal line
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * HLOIN uses TWFL


 Ready-made bytes for plotting horizontal line end caps. This table provides a
 byte with pixels at the left end, which is used for the right end of the line.

 The minimum cap size is two pixels, so the first entry in the table contains
 a two-pixel pattern.

 Bit 7 in each byte is used to define the colour palette in that byte, so the
 pixels themselves are defined in bits 0 to 6. The pixels in bits 0 to 6 appear
 in that order on-screen, so bit 0 is on the left. The comments below show how
 the two bytes map into the screen, with seven pixels per byte.

 See the HLOIN routine for details.


.TWFL

 EQUB %10000011         ; xx00000
 EQUB %10000111         ; xxx0000
 EQUB %10001111         ; xxxx000
 EQUB %10011111         ; xxxxx00
 EQUB %10111111         ; xxxxxx0
 EQUB %11111111         ; xxxxxxx
 EQUB %11111111         ; xxxxxxx