Digital Equipment LA400plus, Руководство пользователя

Страница: 248 / 299

Sixel Graphics Control Codes
Mnemonic Function Command Remarks
DECGRA Set Raster
Attributes " (2/2) Defines the pixel aspect ratio. Followed by
parameters
Pn1 ; Pn2 ; Pn3; Pn4
Pn1: Pixel aspect ratio numerator (A)
Pn2: Pixel aspect ratio denominator (R), where
0 < A/R < 1.5 corresponds to 1:1
1.5 < A/R < 2.25 corresponds to 2:1
2.25 < A/R < 3.75 corresponds to 2.5:1
3.75 < A/R corresponds to 5:1
Pn3 and Pn4 : ignored
DECGRI Graphics Repeat
Introducer ! (2/1) Followed by a numeric value Pn and a sixel data to
be repeated Pn times.
DECGCR Graphics Carriage
Return $ (2/4) Returns active positions to graphics left margins
DECGNL Graphics Next Line - (2/13) Returns active position to graphics left margin on the
following line
DECGCI Graphics Color
Introducer # (2/3) Assigns a color to a color number or selects a
predefined color number.
Followed by parameters
Pc ; Pu ; Px ; Py; Pz
Pc: Color number (0-255)
Pu: Universal coordinate system selector: 1=HLS,
2=RGB
Px, Py, Pz: color coordinates.
Parameter
Characters 0-9
(3/0) - (3/9) Numeric parameters - used on the above control
codes
Parameter
Separator ; (3/11) Separates parameters - used on the above control
codes
Sixel Data (3/15 - 3/14) Sixel printable characters.
The printer substracts the offset (3F hexadecimal)
from the received code, assigning each of the
remaining low- order six bits to a grid position:
LSB = top pixel
MSB = bottom pixel
Examples:
? (3/15): blank character
@ (4/0): print only top pixel
A (4/1) : print second-from-top pixel
~ (7/15): print one full column
DEC PPL2 Quick Reference
D-15