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CONTROL
Control graphics
GIS Viewer EWO
WinCC OA GIS Viewer provides the cartographic representation of objects in WinCC OA. This new feature provides numerous advantages, particularly in geographical distributed systems, like in Water, Traffic, Oil & Gas or Energy.
"getNumLayers"
Returns the number of layers.

CONTROL
- Introduction to CTRL
  An introduction to the product's own programming language Control(CTRL).
- CONTROL Classes
- Types of Control Functions
  An overview of the types of functions distinguished within Control.
- Control graphics
  - Graphics objects
  - Attributes of graphics objects
  - Arc
  - AttentionEffect EWO functions
  - Bar trend
  - BarChart3D EWO
  - Button
  - Calendar
  - Cascade
  - Chart.ewo
  - Checkbox
  - Clock
  - Combobox
  - DateTimeEdit EWO functions
  - DialGauge EWO
  - DoubleSpinbox EWO
  - DpTreeView
  - DpTypeView
  - Embedded module
  - Frame
  - GIS Viewer EWO
    WinCC OA GIS Viewer provides the cartographic representation of objects in WinCC OA. This new feature provides numerous advantages, particularly in geographical distributed systems, like in Water, Traffic, Oil & Gas or Energy.
    - Introduction to the GIS Viewer
    - "acceptDrops"
      Specifies whether drop events are enabled for this object.
    - "addEmptyLayer"
      Adds an empty layer to a map.
    - "addPointToLayer"
      Adds a coordinate to a layer.
    - "addPointToPolygon"
      Adds a point to a polygon.
    - "addPointToPolyline"
      Adds a point to a polyline.
    - "addPolygonToLayer"
      Adds a polygon to a layer.
    - "addPolylineToLayer"
      Adds a polyline to a layer.
    - "addRectangleToLayer"
      Adds a rectangle to a layer.
    - "addVarValueColorMapping"
      With the color mapping function, you can set different colors for a shape for each range of values of an assigned variable.
    - "assignVariableToShape"
      Assigns a variable and a value to a shape so that the shape can be selected by the variable.
    - "contextMenuPolicy"
      Defines how the respective widgets shows the context menu.
    - "deleteAll"
      Deletes all loaded layers and shapes of the GIS Viewer.
    - "deleteLayer"
      Deletes one specified Layer.
    - "drawTooltip"
      Shows a tooltip for the GIS Viewer.
    - "exportLayerIndexFile"
      Exports a layer index file that contains all the information of a layer.
    - "focus"
      The attribute "focus"; returns TRUEif the object has the focus.
    - "font"
      Sets the font of an object.
    - "getLayerFieldIndex"
      Returns the field index for the specified field name in the specified layer.
    - "getLayerFieldName"
      Returns the field name for the specified index in the specified layer.
    - "getLayerName"
      Returns the layer name for the specified index.
    - "getNumFieldsLayer"
      Returns the number of fields for the layer.
    - "getNumLayers"
      Returns the number of layers.
    - "getNumObjects"
      Returns the number of objects in all layers.
    - "getNumObjectsLayer"
      Returns the number of objects for the layer.
    - "getNumPoints"
      Returns the number of points in all layers.
    - "getNumPolygons"
      Returns the number of polygons in all layers.
    - "getShapeNameInLayer"
      Returns the shape name in a layer.
    - "getShapeXCoordinate"
    - "getShapeYCoordinate"
      Returns the Y coordinate for the specified shape.
    - "getXLeft"
      Returns the left edge's x coordinate of the currently displayed area.
    - "getXRight"
      Returns the right edge's x coordinate of the currently displayed area.
    - "getYBottom"
      Returns the bottom edge's Y coordinate of the currently displayed area.
    - "getYTop"
      Returns the top edge's Y coordinate of the currently displayed area.
    - "hideLayer"
      Hides a layer.
    - "home"
      Zooms a map to the full extent.
    - "isActiveWindow"
      The attribute "isActiveWindow"; returns TRUE if this widget is the active window, otherwise FALSE.
    - "layoutDirection"
      Defines the widget's layout direction.
    - "loadColorFile"
      Loads a WinCC OA color file.
    - "loadShapeFile"
      Loads an ESRI shape file.
    - "maxWidthForText"
      Sets the maximum width of the shown area for which the text will be displayed.
    - "memoryReport"
      Creates a memory report file that shows what is in the memory.
    - "moveRectangle"
      Moves a rectangle.
    - "pan";
      Pans a map.
    - "PVSSLinkSumAlertToShape"
      Links a sum alert data point with a shape in the GIS Viewer.
    - "PVSSReceiveSumAlertStatus"
      Passes the results of a dpQuery to the GIS Viewer.
    - "PVSSSetSumAlertPanels";
    - "removePolyLineGradient"
      Removes polyline gradient.
    - "resetShapeFillColor"
      Resets the shape fill color.
    - "resetShapeLineColor"
      Resets the shape line color to the default value.
    - "scrollWheelEnabled"
      Defines whether zooming with the mouse wheel shall be possible.
    - "selectColor"
      Defines the color for the selection window (hold down the left mouse button and draw a rectangle).
    - "selectShapeVarAsShapeName"
      Sets the entries of a selected Field (Column inside the .dbf file) as names for the shapes of a layer.
    - "setAutoZoomExtra"
    - "setLayerClickEnabled"
      Enables or disables the click events for the GIS Viewer.
    - "setLayerDrawAfterText"
      Sets the selected layer at the top.
    - "setLayerFillColor"
      Sets the layer fill color.
    - "setLayerLineColor"
      Sets the layer line color.
    - "setLayerLineStyle"
      Sets the layer line style.
    - "setLayerLineWidth"
      Sets the layer line width. The line width be also set using the function "setLayerLineStyle". The defined width in "setLayerLineStyle" overwrites the width in this function.
    - "setLayerPointSymbol"
      Sets a displaying symbol for a point on a specific layer
    - "setLayerVisibleRange"
      Sets the visible range of a layer.
    - "setMinWidthLayer"
      Sets the minimum width for a layer.
    - "setOpen"
      Sets an item to open if open is TRUE and the item is expandable or to close if open is FALSE.
    - "setPolyLineGradient"
      Sets a polyline gradient.
    - "setPropShapeWildcard"
      Set a property of various shapes that match a wildcard.
    - "setShapeColorByName"
      Sets a shape color by the color name.
    - "setShapeFillColor"
      Sets the fill color for a shape.
    - "setShapeIcon"
      Sets an icon for a shape.
    - "setShapeLineColor"
      Sets the shape line color.
    - "setShapePVSSSymbol"
      Sets a panel reference to a specific shape/point inside the GIS Viewer.
    - "setSmoothSteps"
      Set smooth zooming steps for a map.
    - "setTextVisible"
      Sets a text visible.
    - "showLayer"
      Shows a layer.
    - "showShapesAll"
      Shows all shapes for a layer.
    - "showShapesWildcard"
      Shows shapes by wildcard.
    - "tooltipDuration"
      Specifies how long a tooltip is shown.
    - "updatesEnabled"
      This attribute specifies whether updates of a widget (for example, a textEdit, slider, progress bar, zoom navigator, LCD number or thumb wheel) have been enabled.
    - "updateShapeAndAutoZoom"
      Updates a shape with a color and zooms it in.
    - "x", "y"
      The attributes x and y return the coordinate of an object (e.g. a textEdit, a progress bar, a slider, a zoom navigator, an LCD number or a thumb wheel). x returns the X coordinate of an object. y returns the Y coordinate of an object.
    - "zoom"
      Zooms a map in or out.
    - "zoomByVariableValue"
      Zooms all shapes that are assigned to a certain value of a variable.
    - "zoomByWildcard"
      Allows to zoom to a specific area of the map that is determined using the field entry of the .dbf file.
    - "zoomEnabled"
      Defines if an area can be selected and zoomed with the left mouse button.
    - "zoomLimitMaximum"
      Defines the maximum zoom factor that is allowed.
    - "zoomLimitMinimum"
      Defines the minimum zoom factor that is allowed.
  - Label Functions
  - Layoutgroup functions
  - LCD number
  - Maps Widget - Properties and Functions
  - Panel functions
  - PDF Viewer EWO
  - PictureFlow EWO functions
  - Pipe
  - Polyline
  - Primitive text
  - Progress bar
  - Radio box
  - Rectangle
  - Reference Functions
  - Scheduler.ewo
  - Selection list
  - Slider
  - Spin button
  - Splitter
  - Tab
  - Table
    The available functions of the Table object.
  - TextEdit
  - Text field
  - Thumb wheel
  - ToggleSwitch EWO
  - Tree widget
  - Trend Functions
  - WebView EWO
    All events and functions, specifically available for the WebView EWO.
  - Zoom Navigator
    Functions available for the Zoom Navigator widget.
- CONTROL Functions
- CTRL Debugger
  With the CTRL Debugger you can debug the programming language Control.
- CtrlExtension
  The CtrlExtension allows the addition of custom C++ code.

"getNumLayers"

Returns the number of layers.

Synopsis

int getNumLayers();

Parameters


Parameter	Description
-	-

Description

Returns the number of layers.

Example

The code below will return the number of layers.

main()
{
  DebugN("Number of layers:",GisViewer_ewo1.getNumLayers());
}

Assignment

GIS Viewer