/// <summary>
/// Transforms from world coordinate system (WCS) to image coordinates
/// NOTE: This method DOES NOT take the MapTransform property into account (use <see cref="Map.WorldToImage(GeoAPI.Geometries.Coordinate,bool)"/> instead)
/// </summary>
/// <param name="p">Point in WCS</param>
/// <param name="map">Map reference</param>
/// <returns>Point in image coordinates</returns>
public static ScreenPointF WorldtoMap(Coordinate p, Map map)
{
//if (map.MapTransform != null && !map.MapTransform.IsIdentity)
// map.MapTransform.TransformPoints(new System.Drawing.PointF[] { p });
if (GeoAPIEx.IsEmpty(p))
return ScreenPointF.Empty;
var result = new ScreenPointF();
var height = (map.Zoom * map.Size.Height) / map.Size.Width;
var left = map.Center.X - map.Zoom * 0.5;
var top = map.Center.Y + height * 0.5 * map.PixelAspectRatio;
result.X = (float)((p.X - left) / map.PixelWidth);
result.Y = (float)((top - p.Y) / map.PixelHeight);
if (double.IsNaN(result.X) || double.IsNaN(result.Y))
result = ScreenPointF.Empty;
return result;
}
/// <summary>
/// Transforms an array of <see cref="Coordinate"/>s to an array of <see cref="PointF"/>s.
/// </summary>
/// <param name="vertices">The array of coordinates</param>
/// <param name="map">The map that defines the affine coordinate transformation</param>
/// <returns>The array of <see cref="PointF"/>s</returns>
private static ScreenPointF[] TransformToImage(Coordinate[] vertices, Map map)
{
var v = new ScreenPointF[vertices.Length];
for (var i = 0; i < vertices.Length; i++)
v[i] = Transform.WorldtoMap(vertices[i], map);
return v;
}
