"setAutoZoomExtra"

Synopsis

void setAutoZoomExtra(string strLayer, double dxExtra);

Parameters

Description

he GIS viewer can zoom to certain areas automatically by using functions like ZoomByVariableValue.

This zoom feature has an hard-coded default offset of 1.0 so that it won't zoom in too far. This offset can be changed by the function setAutoZoomExtra. You can set the offset higher or lower. The offset will be valid for the functions:

- updateShapeAndAutoZoom

- zoomByVariableValue

- zoomByWildCard

Example

The function will zoom by using the function ZoomByVariableValue and then set setAutoZoomExtra to 5. If you zoom after setting the

setAutoToomExtra to 5, you will notice that the offset will be bigger. Now there are 5 units ( degrees or meters depending whether you use

degrees or meters in your map) on all sides.

Assign the variable "Cit" to the two capitals Rome and Vienna and zoom to the them:

main()
{
  GisViewer_ewo1.assignVariableToShape( "COUNTRY", "CAPITAL", "Roma", "Cit", 1) ;
  GisViewer_ewo1.assignVariableToShape( "COUNTRY", "CAPITAL", "Vienna", "Cit", 1) ; 
  GisViewer_ewo1.zoomByWildcard("COUNTRY","Cit", "1",0,0);
}

Sets setAutoZoomExtra to 5:

main()
{
  GisViewer_ewo1.setAutoZoomExtra("COUNTRY",5.0);
}

Now use the first code to zoom to the capital again. You will notice a bigger offset.

Assignment

GIS Viewer