dev_set_part🔗
Short description🔗
dev_set_part — Modify the displayed image part.
Signature🔗
dev_set_part( rectangle.origin.y Row1, rectangle.origin.x Column1, rectangle.corner.y Row2, rectangle.corner.x Column2 )
Description🔗
dev_set_part is used to set the part of the image that is displayed
in the graphics window.
The parameters Row1 and Column1 specify the
upper left corner, Row2 and Column2 the lower
right corner of the image part to display.
For more information see the description of the operator
set_part.
In addition, if Row1 is larger than Row2 or
Column1 larger than Column2, the zooming in the particular
dimension will be reset to show the complete height and/or width of the image.
Please note that this is not possible with the operator set_part
outside HDevelop.
In addition, note that the part is automatically reset, if a new program is loaded, a program reset is performed, or a new image with a different image size is displayed.
Attention🔗
Using the code export feature of HDevelop, the code that is generated
for this operator may have a different behavior than the related
HALCON operator.
For a detailed description of the code export of HDevelop graphics
operators into the different programming languages see in the
“HDevelop User's Guide” the chapter Code Export
-> General Aspects of Code Generation
-> Graphics Windows.
Parameters🔗
Row1 (input_control) rectangle.origin.y → (integer)
Row of the upper left corner of the chosen image part.
Default: 0
Column1 (input_control) rectangle.origin.x → (integer)
Column of the upper left corner of the chosen image part.
Default: 0
Row2 (input_control) rectangle.corner.y → (integer)
Row of the lower right corner of the chosen image part.
Default: 128
Column2 (input_control) rectangle.corner.x → (integer)
Column of the lower right corner of the chosen image part.
Default: 128
Example🔗
(HDevelop)
read_image (Image, 'fabrik')
for i := 1 to 240 by 10
dev_set_part (i, i, 511-i, 511-i)
dev_display (Image)
endfor
dev_set_part (1, 1, -1, -1)
dev_display (Image)
Result🔗
If the values of the specified parameters are correct,
dev_set_part returns 2 (H_MSG_TRUE). Otherwise, an
exception is raised and an error code returned.
Combinations with other operators🔗
Module🔗
Foundation