Preparing To Print Graphic Images; Setting Up The Graphics Window; Using Existing Image Plots; Printing An Image - Brother HL-1050 Technical Reference Manual

6.

PREPARING TO PRINT GRAPHIC IMAGES

6.1.

Setting Up the Graphics Window

Before entering HP-GL/2 mode you will probably want to set the dimensions and position of the PCL picture
frame and hence the graphics window.
the same). To do this you will need to send some preparatory PCL commands while in LaserJet mode.
Use the Esc*c0T command to position the picture frame and the Esc*c#X and Esc*c#Y commands to
determine it's horizontal and vertical dimensions respectively.
sub-section Vector Graphics in the LaserJet section of this manual.
If you do not specify a position and dimensions for the picture frame, the default picture frame is used.
is described in the sub-section 'The Page in LaserJet mode' section of this manual.
6.2.

Using Existing Image Plots

If you are importing an existing HP-GL/2 plot you can easily determine the size and position on the page of
the resulting printed graphic.
graphics window ) in either of the following two cases.
1) If you use the Esc*c#K and Esc*c#L PCL commands to specify the width and height of the original plot
before entering HP-GL/2 mode.
in LaserJet
existing plot.
2) If the imported image code is page-size independent.
An image is page-size independent if it's HP-GL/2 code satisfies the following conditions.
• User units are used exclusively,
are issued.
command,
• No absolute units are used or implied,
and character size,
Commands like IP and PA,
supplied,
If you import an image without fulfilling these two criteria,
independent and you do not specify its horizontal and vertical plot sizes,
Any part of the plot that falls outside the effective window will not appear on the printed page.
6.3.

Printing an Image

When you have carried out any necessary preliminary steps that your particular application requires,
described in the preceding sections,
sequence of HP-GL/2 commands to generate the image.
6.4.

Entering HP-GL/2 Mode

To enter graphics mode from PCL printer control language use the Esc%#B command.
want the pen to start from the previous HP-GL/2 pen position.
the current PCL cursor position. You must specify either one setting or the other.
6.5.

Quitting HP-GL/2 Mode

To quit graphics mode use the Esc%#A command.
PCL cursor position.
HP-GL/2 pen position.
(Remember that when you enter HP-GL/2 mode they are initially
Images are automatically scaled and fitted to the picture frame ( the HP-GL/2
These commands are explained in the sub-section 'Vector Graphics
mode' section of this manual.
that is,
Note in particular that if the graphics window is changed from the default using the IW
it must be specified in user units.
pattern length and pen width are always specified as relative measurements.
which imply the use of absolute units even if none are explicitly
should not be used at all.
enter HP-GL/2 mode using the Esc%#B command and send the
This is the default setting.
CHAPTER 4 HP-GL/2 - 11
These commands are described fully in the
( Section 2 )
Only use these commands if you are importing an
an SC command is used before any drawing commands
that is, drawing commands use relative movement only
that is, the image is not page size
the plot will be drawn actual size.
Set # to 1 if you want to the pen to start from
Set # to 0 if you want to place the cursor at the previous
Set # to 1 if you want to place the cursor at the current
2/19/04
This
as
Set # to 0 if you