private void BuildGrid()
{
var gridLines = new List <Feature>();
if (CoordinateSystemFactory == null)
{
log.DebugFormat("Showing map grid is only supported when map has coordinate system defined");
return; // can only draw if coordinate system factory is available
}
for (var i = -180; i <= 180; i += 10)
{
var coordinates = new Coordinate[179];
for (var j = -89; j <= 89; j++)
{
coordinates[j + 89] = new Coordinate(i, j);
}
gridLines.Add(new Feature {
Geometry = new LineString(coordinates)
});
}
for (var i = -90; i <= 90; i += 10)
{
var coordinates = new Coordinate[361];
for (var j = -180; j <= 180; j++)
{
coordinates[j + 180] = new Coordinate(j, i);
}
gridLines.Add(new Feature {
Geometry = new LineString(coordinates)
});
}
var src = CoordinateSystemFactory.CreateFromSRID(4326 /* WGS84 */);
var dst = CoordinateSystem;
var transformation = dst == null ? null : CoordinateTransformationFactory.CreateFromCoordinateSystems(src, dst);
gridLayer = new VectorLayer
{
DataSource = new FeatureCollection {
Features = gridLines, CoordinateSystem = src
}, CoordinateTransformation = transformation,
ShowInTreeView = false,
ShowInLegend = false,
Selectable = false,
Map = this
};
gridLayer.Style.Line.Color = Color.FromArgb(50, 100, 100, 100);
}
