The Relative Direction Instruction, Dr - HP 7470A Interfacing And Programming Manual

The following example labels the years 1978through 1985,in a circular
pattern starting with vertical labeling. The direction in which each
year is labeled is changed by 45 degrees. Then the labels in the center
are drawn to illustrate the use of cosine and sine values as parameters.
The label _*_2000 contains both a carriage return and a line feed
character before the label terminator, ETX, so the pen position at the
end of that label is one line below the beginning of that label. The fact
that DI commands update the carriage return point can be clearly seen
by observing the pen's position at the end of the program. The final
character in the last label is a carriage return and the pen returns to .
the carriage return point, the position of the pen at the last 'DI
command.
"1N;sP2,PH1o5o,445o;"
"DIO,1;LB_*_1S78§ UI1,1;LB_*_19?9§"
"DI1,0;LB_*_19B0§ DI1,-1;LB_*_1981R"
"BIO,-1;LB_*_1S82§ DI-1,-1;LB_*_1SB3&"
"DI-1,0;LB_*_1S84§ DI-1,1;LB_*_1985§"
"PH1500,5350;DI",CDS(OJ,SIN(O);"LB_*_2000$%E"
"DI",CUSL-45);S1N(-45J;"LB_RElURN Polwraa"
é\g_*_1 980\ 'I
_ > \'/.9
§L"n"RL.XE§ E%°+'Jé§'N"p6.~T * __*_2ooo <9,
TQL~\'p [*
0' 6'
"1 "<4. ls
tl Ifiao O0
9 o /N
/\ /3,
'W786I-079'
NOTE: Check the format of the COS and SIN functions on your
computer, and change these accordingly. Also, check your computer
documentation to see how your computer interprets angles. If angles
are interpreted as radians, you need to change to degrees before using
the COS and SIN functions. On the HP Series 80 computers, execute
the BASIC statement DEG. I
The Relative Direction Instruction, DR
DESCRIPTHJNThe relative direction instruction, DR, specifies the direc­
tion in which characters are lettered.
LABELING 5-1 1