Drawing lines: TWFR

       Name: TWFR                                                    [Show more]
       Type: Variable
   Category: Drawing lines
    Summary: Ready-made character rows for the right end of a horizontal line
             in the space view
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * HLOIN uses TWFR


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

 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.


.TWFR

 EQUB %11111111         ; xxxxxxx
 EQUB %11111110         ; 0xxxxxx
 EQUB %11111100         ; 00xxxxx
 EQUB %11111000         ; 000xxxx
 EQUB %11110000         ; 0000xxx
 EQUB %11100000         ; 00000xx
 EQUB %11000000         ; 000000x