RFXCOM RFXtrx433 Especificaciones descargar pdf (Pagina 69)

Chapter 4. Implementation 62

key1: value1

key2: value2

keyN: valueN

user

QGraphicsView

QGraphicsScene

receiver item

sender item

QMultiHash

<name, receiver item*>

receiver item

sender item

key1: value1

key2: value2

keyN: valueN

QMultiHash

<name, sender item*>

Figure 4.22.: The main elements of the visualization menu. QGraphicsView is used to display the

QGraphicsScene, which contains custom receiver and sender items for rendering. To

optimize the access time, two QMultiHash containers store pointers of the items.

4.5.3. Scene Menu

The scene menu is a class for facilitating the control over HA devices and generating scenes.

Scenes are graphical representations of namespaces and are composed of three parts:

Name: Every scene has a unique name for identiﬁcation that serves as a namespace.

Background image: The background image adds additional information on the scene and enables

an intuitive arrangement of elements. All kinds of images can be used, for example a ground

plan, a photo of a room or an abstract model.

Elements: Elements represent devices within a scene and can be placed anywhere on the back-

ground image and moved by drag and drop. They are composed of their name, an icon

that shows their type and a green or red label for their current state. Each element can be

accessed by "scene_name/element_name" through by the "switch receiver/sender"-service.

Scenes usually describe locations, such as rooms or places; consequently, devices can be separated

in spatial groups, which simplify the management of large networks. Figure 4.23 on the following

page depicts the example scene "dormitory" with three elements. Each of these elements can be

addressed by the namespace "dormitory" for example "dormitory/plug A".

A new scene can be generated by clicking the new-button in the scene selection box. The new

scene is empty, which means it contains no elements and no background. Consequently, the ﬁrst

step is to select a background in the settings tab (ﬁgure 4.24 on the next page) and scale it to the

desired size. Enabling the quick buttons option will cause the element to switch on/oﬀ every time

it is clicked. The second step is to ﬁll the scene with elements. That can be done by choosing

the add-tab, select a receiver or transmitter and click add to scene. The info-tab shows general

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RFXCOM RFXtrx433 Especificaciones Pagina 69