create_drawing_object_circle — Create a circle which can be modified interactively.
create_drawing_object_circle creates a circular region which can be interactively modified in a HALCON window by the user. The circle is defined by the coordinates Row and Column of its center, and by its Radius. The created circle is returned in the handle DrawID.
These parameters can be queried any time with get_drawing_object_params, as well as its corresponding HALCON object with get_drawing_object_iconic.
In addition to those parameters, every drawing object has a number of parameters which determine the appearance of the object in the HALCON window. See set_drawing_object_params for details on the number and meaning of those parameters.
In order to enable the interactive modification with the drawing object, the object must be attached to an existing window. See attach_drawing_object_to_window for further details. Once attached, the circle is editable by the user through interaction within the window. There are two possible transformations for a circle object: resizing and displacement. By clicking close to the circular arc you can modify the Radius of the circle. By clicking on the center, the circle can be dragged across the HALCON window.
In contrast to the operator draw_circle, this interaction does not block the calling thread.
Note that since internal structures are allocated during create_drawing_object_circle and the following operators the drawing object should be explicitly freed if it is no longer needed.
This operator returns a handle. Note that the state of an instance of this handle type may be changed by specific operators even though the handle is used as an input parameter by those operators.
Row coordinate of the center.
Default value: 100
Column coordinate of the center.
Default value: 100
Radius of the circle.
Default value: 80
Handle of the drawing object.
If the parameter values are correct the operator create_drawing_object_circle returns the value 2 (H_MSG_TRUE). Otherwise an exception is raised.
attach_drawing_object_to_window, get_drawing_object_params, get_drawing_object_iconic
draw_circle, draw_region, create_drawing_object_circle_sector, create_drawing_object_ellipse, create_drawing_object_ellipse_sector
create_drawing_object_rectangle1, create_drawing_object_rectangle2, create_drawing_object_ellipse, create_drawing_object_circle_sector, create_drawing_object_ellipse_sector, create_drawing_object_xld