MICROTRONIX DX-2200, Руководство пользователя

Страница: 28 / 103

DX-2200
– SD/HD-SDI Text & Graphics Inserter – User Manual
Page 28 of 103
Instead of specifying a single field, the commands can be applied to all fields on the layer by specifying a
field number of 0. For example G0S enables the display all fields on the layer and is equivalent to the
commands G1S, G2S, G3S… G48S.
Commands can be applied to a range of sequential fields using the syntax "f1-f2" for the field number where
f1 is the first field and f2 is the last field the command applies to. For example the command G7-10S enables
display of fields 7, 8, 9, and 10.
By default, all Graphic Fields are turned off and have default parameters. To display a field, the following
steps are required:
1) the field must be configured with the required field type
2) the parameters must be set appropriately
3) display of the field must be enabled
4) the layer must be updated
Some commands combine the last two operations in the above list, for example the G2S command enables
the display of Graphic Field 2 (on the active layer) and also updates the layer.
The following commands are a simple example that displays a rectangle. These commands are intended for
use with the DX-2200-TI in the factory default configuration:
G1M2
‘ Set Field 1 to be a Rectangle Field
G1PA100,100
‘ Coordinate A = (100,100)
G1PB300,300
‘ Coordinate B = (300,300)
G1S
‘ Enable display of Field 1 and update the layer
4.8.1.9.3 R
ESET
G
RAPHIC
F
IELD
A Graphic Field can be reset to its default values with the GnnZ command where nn is the Graphic Field
number to reset. The GZ command will reset all Graphic Fields on the Active Layer, and the G0Z command
resets the fields on all layers to default.
Resetting a Graphic Field will clear the Text string, set the line color to white with full visibility, set the
position to the top left corner, set the fill color to blue but fully transparent (not visible), and set the font to the
default for the current video resolution. The overall visibility of the Field is set to off.
Resetting fields does not automatically update the video output of the overlay. Any fields that are visible in
the video are not cleared until a command is received that causes the overlay to be updated.
4.8.1.9.4 G
RAPHIC
F
IELD
V
ISIBILITY
Each Graphic Field can be turned on or off independently. By default, fields are off. The GnnV, GnnS, and
GnnH commands control the visibility of field number nn. GnnS and GnnH turn visibility on and off
respectively, and GnnV toggles visibility between on and off. Using any one of these commands will also
cause the video output to be updated by rendering the fields to the spare buffer and performing a buffer
swap. For this reason, it may be undesirable to use these commands when several text fields need to be
turned on or off because the video output will be updated as each command is executed. This will result in
the fields turning on or off one at a time.
The commands GnnVN, GnnSN, and GnnHN also control the visibility of Graphic Field nn, but without
updating the output and are recommended when the visibility of more than one field is to be changed at the
same time. The GU command can be sent to update the output after all visibility changes have been made.
The GnnHdddd command will turn off the visibility of text field nn after approximately dddd frames of video
have been output. When the GnnH is used with a delay, the overlay is automatically updated after the delay.