CenterAndScale

Base Type: MapArea

A class that defines the center point and scale for a map.

Property	Type	Description
Center	Point	The location on which to center the map.
DevBottom	int	The X cooridnate for bottom right corner point.
DevBottomSpecified	bool	Indicates if DevBottom is specified.
DevLeft	int	The X coordinate for the upper left corner point.
DevLeftSpecified	bool	Indicates if DevLeft is specified.
DevRight	int	The Y coordinate for the bottom right corner point.
DevRightSpecified	bool	Indicates if DevRight is specified.
DevTop	int	The X coordinate for the upper left corner point.
DevTopSpecified	bool	Indicates if DevTop is specified.
DPI	double	The device resolution of the image.
DPISpecified	bool	Indicates if DPI is specified.
Scale	double	The map scale.

Remarks

To use, create a new object and set the geographic extent of the map by setting a center point and a map scale. Set the MapDescription.MapArea property to this newly created object. If the spatial reference of the map service has changed, remember to adjust the spatial reference of the center point to match the new spatial reference.

Note that this object does not compute map extent. When used with the ExportMapImage method, the returned MapImage object can be used to get the updated map extent.

Examples

C#

MapService_MapServer mapService = new MapService_MapServer();

mapService.Url = "http://localhost:6080/arcgis/services/MapService/MapServer";

MapServerInfo mapInfo = mapService.GetServerInfo(mapService.GetDefaultMapName());

MapDescription mapDesc = mapInfo.DefaultMapDescription;
 

ImageType imgType = new ImageType();

imgType.ImageFormat = esriImageFormat.esriImagePNG;

imgType.ImageReturnType = esriImageReturnType.esriImageReturnURL;
 

ImageDisplay imgDisp = new ImageDisplay();

imgDisp.ImageHeight = pictureBox1.Height;

imgDisp.ImageWidth = pictureBox1.Width;

imgDisp.ImageDPI = 96;
 

ImageDescription imgDesc = new ImageDescription();

imgDesc.ImageDisplay = imgDisp;

imgDesc.ImageType = imgType;
 

PointN pointN = new PointN();

pointN.X = -100;

pointN.Y = 35;
 

CenterAndScale centerScale = new CenterAndScale();

centerScale.Center = pointN;

centerScale.Scale = mapService.ComputeScale(mapDesc, imgDisp) / 4;
 

mapDesc.MapArea = centerScale;

MapImage mapImage = mapService.ExportMapImage(mapDesc, imgDesc);