HP 262SA - Page 288

Graphics
User Defined Area Fill Patterns
The user area pattern is defined by 8 parameters, one for every row of dots in the pattern. Each
parameter is an integer in the range -32768 to 32767. The number is interpreted as a 2's
complement number,
and the least significant 8-bits are used to obtain a value between 0 and
255. The 8-bit number (0 to 255) represents an 8-bit binary pattern. Bits set to 1 are drawn
using the primary pen, and bits set to0 (zero) are not drawn (depending on the current drawing
mode).
The command for defining a user area fill pattern is:
Ec * m (row O>(row 1>. • • (row 7> d
where (row 0> is the 8-bit pattern for row 0
(r ow 7> is the 8-bit pattern for row 7
Examp1 e: Define a simple checkerboard pattern.
Row 0 = 10101010 = 170
Row 1
= 01010101 = 85
Row 2
= 10101010 = 170
Row 3
= 01010101 = 85
Row 4 = 10101010 = 170
Row 5
= 01010101 = 85
Row 6
= 10101010 = 170
Row 7
= 01010101 = 85
Ec * m 170 85 170 85 170 85 170 85 D
Row 0
Row 7
NOTE: The scalefactor of an area fill pattern is always 1.
Other examples of user defined area patterns are shown in figure D-8.
D-18