attach_drawing_object_to_window — Attach an existing drawing object to a HALCON window.
attach_drawing_object_to_window attaches the drawing object DrawHandle to the HALCON window specified in WindowHandle. When attached to a window the drawing object is displayed in the specified window. The drawing object can be modified interactively in the HALCON window. The window is automatically updated when the objects properties are modified using the operator set_drawing_object_params.
When two or more drawing objects overlap, a double-click on the currently selected drawing object will shift the focus to the next drawing object.
Furthermore it is possible to react to modifications of the drawing object caused by user interaction when using any of the language interface. Please see the documentation of set_drawing_object_callback for more details.
The drawing object can be removed from the current window with the operator detach_drawing_object_from_window.
As soon as a drawing object is attached to the window, each HALCON object which is displayed by any of the graphical operators, namely disp_obj, disp_region, disp_image and disp_xld, is stored internally in a graphical stack associated with the WindowHandle, so that they can be displayed together with the attached drawing object. These remain in the stack until the user calls clear_window or the window is closed.
The size of this graphical stack can be queried and modified with get_system and set_system, respectively. See the corresponding documentation reference for further details.
Note that using any synchronous operator which actively probe the event queue, e.g., get_mbutton or read_char, will conflict with the interaction with the drawing objects. In case you need to read the state of the cursor, please refer to the documentation of your framework of choice for an appropriate, non-invasive alternative.
Furthermore, the event based functionality should not be used together with the former blocking operators draw_rectangle1, draw_rectangle2, draw_region, draw_xld or draw_circle. They conflict with the event based functionality, since they actively fetch all events sent to the HALCON window.
When working under UNIX/Linux it is necessary to turn on the support for multithreading in the Xlib. This is achieved by calling the function XInitThreads() before any other function of the Xlib library. This means that you need to call it before any other function or method of your graphical development environment of choice. See the documentation of the function XInitThreads() in the corresponding manual page for further details.
Handle of the drawing object.
attach_drawing_object_to_window returns 2 (H_MSG_TRUE), if the DrawHandle and WindowHandle are valid. Otherwise an exception is raised.
create_drawing_object_rectangle1, create_drawing_object_xld, create_drawing_object_circle_sector, create_drawing_object_ellipse_sector, create_drawing_object_ellipse, create_drawing_object_line, create_drawing_object_rectangle2, create_drawing_object_circle, create_drawing_object_text
detach_drawing_object_from_window, get_drawing_object_params, get_drawing_object_iconic
set_drawing_object_callback, get_drawing_object_iconic, get_drawing_object_params