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, , 0 , 0 1 1 0
214
Scale
=
1
Graphics
Scale
=
2
1 1 1 1 1
0
1
0
250
Scale
=
1
Scale
2
1IIIIIIIIIooeeoollllllili
1010101 0
170
Scale
=
1
Scale
2
Figure D-5. Examples of User-Defined Line Types
Line patterns too complex to be obtained from an 8X8 area pattern can be generated by
plotting a series of lines and varying the patterns used for successive lines. Complex patterns
such as those used in weaving can be generated easily using this technique.
Example: Define a pattern to generate the following vector:
********** **
**********
**
00
00
00
00
pattern
=
1111010
=
250
scale
=
2
Ec
*
m 250 2 C
DEFINE AREA PATTERN.
An 8X8 pattern can be defined for use in filling rectangular
areas. The pattern can also be used to provide line patterns for horizontal or vertical lines when
the area pattern is selected as a line type (type
=
3). (Refer to Define Line Type.) Irregular
shapes can also be built up by selecting the area shading pattern and then using successive
lines.
The area pattern is defined using 8 parameters, one for each of the rows in the pattern. Each
parameter is a decimal number (0 to 255) representing an 8-bit binary pattern. Refer to Define
Line Pattern for additional information. The display is divided up into' 8X8 cells. Every point
on the display is mapped to a corresponding bit in the pattern. Drawing horizontal or vertical
lines causes the corresponding row or column of the pattern to be used as the line pattern.
Diagonal vectors will always be drawn using a solid line. Figure D-6 contains sample area fill
patterns.
Define Area Pattern:
where:
(row
0>
is the 8-bit pattern for row 0
<row
7>
is the 8-bit pattern for row 7
0-15
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