HP 262SA - Page 283

0,100
0,0
200,100
200,0
Graphics
Example: Select the area pattern as the line type.
Ec *m 51,204,
I
51,204,51,204,
(Defines area pattern shown
51,204D
in figure D-4b)
Ec
* m
38
(Selects the area pattern)
Ec
*pa
2,3,7,32
I
~
Ec
*pa
9,3,9,122
(Draws the vectors shown in
Ec
*pa
2,10,7,52
figure D-4a)
Drawing vectors (2,3)-(7,3),(9,3)-(9-12), and (2,10)-(7,5) using the area pattern shown in figure
D-4b would result in the drawing shown in figure D-4a.
Note: Only horizontal and vertical vectors can be defined with an area pattern. All diagonal
vectors
are drawn as a solid line.
Adjacent
horizontal or vertical lines using the user defined line type (type = 2) can be used to
create patterns more complicated than those available in an 8X8 area pattern. User defined
line and area patterns are described in the following paragraphs.
DEFINE LINE PATTERN. The dot pattern used to draw vectors can be defined program-
matically. Once a pattern is defined, you must select the user defined line type (type = 2) using
the Select Line Type command. Figure D-5 gives examples of line patterns.
A user-defined line pattern is composed ofa dot pattern and a scale factor. The dot pattern is a
sequence
of eight l's and O's. Using the default drawing mode, points indicated as a ((I" in the
pattern are drawn using the primary pen, and the pointsindicated as a '0(( are left unchanged.
The pattern is given as a decimal number between 0 and 255 that is the decimal equivalent of
the 8-bit binary pattern. The default pattern is all ((l"s (255). For example, ... = 10101010
(binary)
= 170 (decimal). The actual number used for the pattern can be between -32768 and
32767. The least significant 8 bits of the number's 2's complement equivalent are used to
determine the pattern.
D-13