Diagonal Lines

You can make 45 degree angles with two nested FOR-NEXT loops:

1. Diagonal line from lower left to upper right:

  10 FOR A=X TO X where X is lower left point
  20 FOR B=X TO N where N is upper right point
  30 PLOT A,B
  40 NEXT A
  50 NEXT B

2. Diagonal line from upper left to lower right:

  10 FOR A=X TO X where X is upper left point
  20 FOR B=N TO X STEP -1 where N is lower right point
  30 PLOT A,B
  40 NEXT A
  50 NEXT B

Here is the listing for “M”. Lines 10-30 and 140-160 plot the vertical uprights.

  10 FOR A=10 TO 30
  20 PLOT 0,A
  30 NEXT A
  40 FOR B=1 TO 1
  50 FOR C=30 TO 24 STEP -1
  60 PLOT B,C
  70 NEXT B
  80 NEXT C
  90 FOR D=7 TO 7
 100 FOR E=24 TO 30
 110 PLOT D,E
 120 NEXT D
 130 NEXT E
 140 FOR F=10 TO 30
 150 PLOT 14,F
 160 NEXT F