Drawing lines: lineBufferR

       Name: lineBufferR                                             [Show more]
       Type: Variable
   Category: Drawing lines
    Summary: Line buffer storage for the start x-coordinate (R)
  Deep dive: Line buffers
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * DrawClippedLine (Part 6 of 6) uses lineBufferR
             * EraseCanopyLines uses lineBufferR


 This table stores information about lines that are drawn on-screen, so they
 can be quickly erased without having to spend precious time recalculating the
 line coordinates. The information is stored when a line is drawn by the
 DrawClippedLine routine, and is read by the EraseCanopyLines routine when the
 line is erased.

 The initial contents of the variable is just workspace noise and is ignored.
 It actually contains snippets of the original source code.

 We can buffer up to 96 lines, with 48 in each of the two line buffers, so the
 maximum number of lines on screen at any one time is 48 lines out of the 193
 lines defined in the world.


.lineBufferR

 EQUB &64, &6C, &70, &32, &0D, &03, &B4, &19
 EQUB &20, &20, &20, &20, &20, &20, &44, &45
 EQUB &43, &26, &37, &34, &3A, &42, &4E, &45
 EQUB &20, &64, &6C, &70, &31, &0D, &03, &B5
 EQUB &0D, &20, &20, &20, &20, &20, &20, &72
 EQUB &74, &73, &0D, &03, &B6, &05, &20, &0D
 EQUB &03, &BF, &25, &2E, &55, &42, &55, &4C
 EQUB &20, &4C, &44, &59, &23, &31, &35, &3A
 EQUB &53, &54, &59, &20, &4F, &42, &3A, &4C
 EQUB &44, &41, &23, &39, &38, &3A, &53, &54
 EQUB &41, &20, &50, &50, &0D, &03, &C0, &1D
 EQUB &2E, &75, &62, &75, &32, &20, &54, &59