create_drawing_object_ellipse🔗
Short description🔗
create_drawing_object_ellipse — Create an ellipse which can be modified interactively.
Signature🔗
create_drawing_object_ellipse( ellipse.center.y Row, ellipse.center.x Column, ellipse.angle.rad Phi, ellipse.radius1 Radius1, ellipse.radius2 Radius2, out drawing_object DrawID )
Description🔗
create_drawing_object_ellipse creates an ellipse which can be
modified interactively in a HALCON window by the user. The ellipse is defined
by the coordinates of its center point, Row and Column,
the lengths of its respective half axis, Radius1 and
Radius2, and its orientation Phi.
The parameters can be queried 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 ellipse is editable by the user through interaction
with the window.
There are three possible transformations for an ellipse object:
resizing, displacement and rotation.
The ellipse can be resized by clicking close to the vertex handles.
The orientation and thus the rotation of the ellipse can be modified by
dragging on a vertex of the first half axis. The ellipse can be moved in
the HALCON window by dragging the center.
In contrast to the operator draw_ellipse, this interaction does not
block the calling thread.
Execution information🔗
Execution information
-
Multithreading type: reentrant (runs in parallel with non-exclusive operators).
-
Multithreading scope: global (may be called from any thread).
-
Processed without parallelization.
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.
Parameters🔗
Row (input_control) ellipse.center.y → (real)
Row index of the center.
Default: 200
Column (input_control) ellipse.center.x → (real)
Column index of the center.
Default: 200
Phi (input_control) ellipse.angle.rad → (real)
Orientation of the first half axis in radians.
Default: 0
Radius1 (input_control) ellipse.radius1 → (real)
First half axis.
Default: 100
Radius2 (input_control) ellipse.radius2 → (real)
Second half axis.
Default: 60
DrawID (output_control) drawing_object → (handle)
Handle of the drawing object.
Result🔗
If the parameter values are correct the operator
create_drawing_object_ellipse returns the value 2 (H_MSG_TRUE).
Otherwise an exception is raised.
Combinations with other operators🔗
Combinations
Possible predecessors
Possible successors
disp_region, set_colored, set_line_width, set_draw, attach_drawing_object_to_window
Alternatives
draw_ellipse_mod, draw_ellipse, draw_region
See also
Module🔗
Foundation