The Layer's background can display unlimited graphics of different sizes and positions. The Picture / ExtraPicture property adds a picture on the layer's background. Use the Value property to specify a solid / EBN color to be applied on the layer's background.

The following properties can be used to move / resize the picture on the layer's background:

• DisplayAs, retrieves or sets a value that indicates the way how the graphic is displayed on the layer's background.
• Left, specifies the expression relative to the view/current picture, to determine the x-position to show the current picture on the background.
• Top, specifies the expression relative to the view/current picture, to determine the y-position to show the current picture on the background.
• Width, specifies the expression relative to the view/current picture, to determine the width to show the current picture on the background.
• Height, specifies the expression relative to the view/current picture, to determine the height to show the current picture on the background.

The following properties can be used to load / import ( manually or automatically ) pictures to the layer's background:

• PicturesPath property, specifies the path to load pictures from.
• PicturesName property, specifies the expression that defines the name of the file from the PicturesPath folder to be loaded.
• Picture.Name / Picture.Value property of the Background.Picture object, defines the name of the file to be loaded ( relative, absolute, encoded or Picture object )

The PicturesPath /  PicturesName properties can be used to automatically loads files from a specified folder to be displayed on the layer's background.  

For instance, 

PicturesPath = "C:\Program Files\Exontrol\ExGauge\Sample\Design\Circular\Knob", defines default folder to load pictures from.
PicturesName = "`Layer` + str(value + 1) + `.png`", defines the name of the picture file to be loaded by the layer with the index / value. It defines the names as: Layer1.png for the layer with the index 0, Layer2.png for the layer with the index 1, Layer3.png for the layer with the index 2, and so on.

The Picture.Name / Picture.Value property of the Picture object loads a picture / graphics to be displayed on the layer's background. 

The Name / Value property could be one of the following:

• A String expression indicates:
  • a name of a picture file in the PicturePath folder. For instance, Name = "Layer1.png", loads the Layer1.png file if found in the PicturePath folder.
  • a picture file including its absolute path. For instance, Name = "C:\Program Files\Exontrol\ExGauge\Sample\Design\Circular\Knob\Layer1.png", loads the Layer1.png file from absolute path
  • a key of the HTML picture, previously loaded by the HTMLPicture method. For instance, Name = "pic1", loads the HTML picture with the key pic1, so the pic1 should be load previously with a HTMLPicture call like HTMLPicture("pic1") = "C:\Program Files\Exontrol\ExGauge\Sample\Design\Circular\Knob\Layer1.png"
  • an encode BASE64 string of a picture file. The Exontrol's ExImages Tool encode/decode BASE64 strings from/to pictures. In this case, the string starts with "gB..", "gC.." and so on.
• A Picture object that indicates the picture to be displayed. For instance, Name = LoadPicture("picture.jpg")