/// <summary>
/// Set up the map texture. The texture will be projected orthographically onto
/// the geometry and tile plane so we need to work out the correct orthographic
/// size to use. We need the size (in Unity coords of the tile floor plane) and also the
/// map image and associated metadata. The metadata will tell us which sub rect of the
/// supplied image we want to project onto the Tile Floor plane.
/// </summary>
/// <param name="TilePlaneWidth"></param>
/// <param name="TilePlaneHeight"></param>
/// <param name="TileMetadata"></param>
private void CreateTexture(int TilePlaneWidth, int TilePlaneHeight, MetadataRootobject TileMetadata)
{
var bbox = _tileMetadata.resourceSets[0].resources[0].bbox;
var bMinLat = bbox[0];
var bMinLon = bbox[1];
var bMaxLat = bbox[2];
var bMaxLon = bbox[3];
float propLon = (bMaxLon - bMinLon) / (maxLon - minLon);
float propLat = (bMaxLat - bMinLat) / (maxLat - minLat);
var prop = propLat < propLon ? propLat : propLon;
int orthoSize = 0;
if (propLat < propLon)
{
orthoSize = (int)(prop * TilePlaneHeight / 2.0f);
}
else
{
orthoSize = (int)(prop * TilePlaneWidth / 2.0f);
}
if (_useProjector == true)
{
// Don't want to call this until all of the data is loaded..
CreateProjector(_satelliteTexture, orthoSize, _tilePlane);
}
}
/// <summary>
/// Take a 2D map coordinate (in lat/lon) and convert to a UV coordinate which will
/// index into the map image tile
/// </summary>
/// <param name="coord"></param>
/// <returns></returns>
Vector2 MapCoordToUV(Vector2 coord, MetadataRootobject tiledata)
{
// bbox of the tile image in lat/lon
var bbox = _tileMetadata.resourceSets[0].resources[0].bbox;
var bMinLat = bbox[0];
var bMinLon = bbox[1];
var bMaxLat = bbox[2];
var bMaxLon = bbox[3];
var min = GM.LatLonToMeters(bMinLat, bMinLon);
var max = GM.LatLonToMeters(bMaxLat, bMaxLon);
double lon = coord.x + min.x + 0.5 * (max.x - min.x);
double lat = coord.y + min.y + 0.5 * (max.y - min.y);
double u = (lon - min.x) / (max.x - min.x);
double v = (lat - min.y) / (max.y - min.y);
return(new Vector2((float)u, (float)v));
}