attach_background_to_windowT_attach_background_to_windowAttachBackgroundToWindowAttachBackgroundToWindowattach_background_to_window (算子名称)

名称

attach_background_to_windowT_attach_background_to_windowAttachBackgroundToWindowAttachBackgroundToWindowattach_background_to_window — Attach a background image to a HALCON window.

参数签名

描述

This operator attaches the background image passed in ImageImageImageImageimageimage to a HALCON window defined in WindowHandleWindowHandleWindowHandleWindowHandlewindowHandlewindow_handle. The input image is copied. Thus it can be freed safely.

The background image is instantly displayed in the HALCON window when calling attach_background_to_windowattach_background_to_windowAttachBackgroundToWindowAttachBackgroundToWindowAttachBackgroundToWindowattach_background_to_window. All HALCON objects that were previously displayed in the window will still be displayed when calling this operator. Thus the previous window content will not be overwritten.

The window contents are displayed in the following order: first the background image, then HALCON objects, and finally the drawing objects. Thus, the drawing object is displayed always on top. Note that the window will be redrawn for each user interaction within the window and each call of set_partset_partSetPartSetPartSetPartset_part. HALCON objects can be deleted from the window with clear_windowclear_windowClearWindowClearWindowClearWindowclear_window.

The background image can be removed from the window with the operator detach_background_from_windowdetach_background_from_windowDetachBackgroundFromWindowDetachBackgroundFromWindowDetachBackgroundFromWindowdetach_background_from_window.

注意

Note that using any synchronous operator which actively probe the event queue, e.g., get_mbuttonget_mbuttonGetMbuttonGetMbuttonGetMbuttonget_mbutton or read_charread_charReadCharReadCharReadCharread_char, will conflict with the interaction with the drawing objects. In case the state of the cursor has to be read, 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_rectangle1draw_rectangle1DrawRectangle1DrawRectangle1DrawRectangle1draw_rectangle1, draw_rectangle2draw_rectangle2DrawRectangle2DrawRectangle2DrawRectangle2draw_rectangle2, draw_regiondraw_regionDrawRegionDrawRegionDrawRegiondraw_region, draw_xlddraw_xldDrawXldDrawXldDrawXlddraw_xld or draw_circledraw_circleDrawCircleDrawCircleDrawCircledraw_circle. They conflict with the event based functionality, since they actively fetch all events sent to the HALCON window.

运行信息

• 多线程类型:可重入(与非独占操作符并行运行)。
• 多线程作用域:全局(可以从任何线程调用)。
• 未经并行化处理。

参数表

结果

If the window exists and the specified parameters are correct attach_background_to_windowattach_background_to_windowAttachBackgroundToWindowAttachBackgroundToWindowAttachBackgroundToWindowattach_background_to_window returns 2 ( H_MSG_TRUE) . If necessary an exception is raised.

可能的前置算子

open_windowopen_windowOpenWindowOpenWindowOpenWindowopen_window

可能的后置算子

detach_background_from_windowdetach_background_from_windowDetachBackgroundFromWindowDetachBackgroundFromWindowDetachBackgroundFromWindowdetach_background_from_window

模块

Foundation

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