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Home GeoPack GeoMap Class TGeoMap Methods CreateAndLoadEmptyMap
See also: CalibDataFile 

CreateAndLoadEmptyMap

Unit:SDL_geomap
Class: TGeoMap
Declaration: procedure CreateAndLoadEmptyMap (FName: string; LatLow, LongLow, LatHigh, LongHigh, dLat, dLong: double; Wid, Hgt: integer);

The method CreateAndLoadEmptyMap creates a blank map showing an area which is defined by the parameters LatLow, LongLow, LatHigh, LongHigh. The parameters dLat and dLong control the distance of displayed graticule lines. The parameters Wid and Hgt specify the width and the height of the map image (in pixels). The blank map is written as a Windows BMP file to the disk using the file specification contained in FName.

Hint 1: Map image files can become rather large if both the Wid and the Hgt parameter are large. In order to reduce the required disk space, the bitmap is always stored as a 16-color bitmap.

Hint 2: You are responsible yourself to specify the range parameters and/or the width and height in a way that they correspond well to each other.


Last Update: 2007-Mai-19