protected int InsertExtent(string layername, MG_MapExtent mapExt)
{// INSERT INTO ext(layername, minx, miny, maxx, maxy) VALUES('links', 1.1, 1.1, 2.2, 2.2);
string strSQL = "INSERT INTO ext(layername, minx, miny, maxx, maxy) VALUES('{0}', {1}, {2}, {3}, {4});";
strSQL = String.Format(strSQL, layername.ToLower(), mapExt.MinX, mapExt.MinY, mapExt.MaxX, mapExt.MaxY);
return(this.Run(strSQL));
}
protected MG_MapExtent GetExtent(string layername)
{// SELECT minx, miny, maxx, maxy FROM ext WHERE layername = 'links';
string strSQL = "SELECT minx, miny, maxx, maxy FROM ext WHERE layername = '{0}';";
strSQL = String.Format(strSQL, layername.ToLower());
NpgsqlDataReader reader = this.Select(strSQL);
if (reader != null)
{
if (reader.HasRows)
{
MG_MapExtent mapExt = new MG_MapExtent();
int fc = reader.FieldCount; // 4
while (reader.Read())
{ // xmin ymin xmax ymax
double xmin = Double.Parse(reader["minx"].ToString());
double ymin = Double.Parse(reader["miny"].ToString());
double xmax = Double.Parse(reader["maxx"].ToString());
double ymax = Double.Parse(reader["maxy"].ToString());
mapExt.SetExtent(xmin, ymin, xmax, ymax);
}
reader.Close();
reader.Dispose();
return(mapExt);
}
}
return(null);
}
public MG_MapView(Rectangle rect, MG_MapExtent me)
{
this.Scale = 1.0;
this.CurrentWindow = rect;
this.CurrentExtent = me;
this.Calculate();
}
private string LayerPath; // null or not
#endregion Fields
#region Constructors
public MG_Layer()
{
layerCount++;
this.LayerName = "Layer_" + layerCount.ToString();
this.LayerPath = null;
this.IsVisible = true;
this.FeatureSet = new MG_FeatureSet();
this.FieldSet = new MG_FieldSet(this.LayerName);
this.Extent = new MG_MapExtent();
this.Type = MG_GeometryType.NONE;
}
public MG_Map()
{
mapCount++;
this.MapName = "Map_" + mapCount.ToString();
this.MapPath = null;
this.MapExtent = new MG_MapExtent();
this.LayerSet = new MG_LayerSet();
this.ZoomHistory = new MG_ZoomHistory();
this.CurrentZoomIndex = -1;
this.MapView = null;
}
public void AddLayer(MG_Layer layer)
{
this.LayerSet.Add(layer);
// calculate extent dynamic
if (this.MapExtent.Empty())
{
this.MapExtent = layer.Extent;
}
else
{
this.MapExtent = calculateExtent(this.MapExtent, layer.Extent);
}
}
private MG_MapExtent calculateExtent(MG_MapExtent e1, MG_MapExtent e2)
{
MG_MapExtent ext = new MG_MapExtent();
ext.MinX = min(e1.MinX, e2.MinX);
ext.MinY = min(e1.MinY, e2.MinY);
ext.MaxX = max(e1.MaxX, e2.MaxX);
ext.MaxY = max(e1.MaxY, e2.MaxY);
return ext;
}
public void SetMapExtent(MG_MapExtent mapExtent)
{
// zoom to layer : mapextent = layerextent
this.MapExtent = mapExtent;
}
public void RemoveLayer(int i)
{
if (i < 0 || i >= this.GetLayerCount())
return;
this.LayerSet.RemoveAt(i);
// calculate extent dynamic(except i layer)
this.MapExtent = new MG_MapExtent();// Empty extent
for (int j = 0; j < this.GetLayerCount(); j++)
{
if (j != i)
{
if (this.MapExtent.Empty())
{
this.MapExtent = this.LayerSet.GetAt(j).Extent;
}
else
{
this.MapExtent = calculateExtent(this.MapExtent, this.LayerSet.GetAt(j).Extent);
}
}
}
}
public void InitMapView(Rectangle rect, MG_MapExtent me)
{
// layerCount>0 => MapExtent!=Empty => MapView!=null
if (!this.MapExtent.Empty())
{
this.MapView = new MG_MapView(rect, me);
}
}
protected MG_MapExtent GetExtent(string layername)
{
// SELECT minx, miny, maxx, maxy FROM ext WHERE layername = 'links';
string strSQL = "SELECT minx, miny, maxx, maxy FROM ext WHERE layername = '{0}';";
strSQL = String.Format(strSQL, layername.ToLower());
NpgsqlDataReader reader = this.Select(strSQL);
if (reader != null)
{
if (reader.HasRows)
{
MG_MapExtent mapExt = new MG_MapExtent();
int fc = reader.FieldCount; // 4
while (reader.Read())
{// xmin ymin xmax ymax
double xmin = Double.Parse(reader["minx"].ToString());
double ymin = Double.Parse(reader["miny"].ToString());
double xmax = Double.Parse(reader["maxx"].ToString());
double ymax = Double.Parse(reader["maxy"].ToString());
mapExt.SetExtent(xmin, ymin, xmax, ymax);
}
reader.Close();
reader.Dispose();
return mapExt;
}
}
return null;
}
protected int InsertExtent(string layername, MG_MapExtent mapExt)
{
// INSERT INTO ext(layername, minx, miny, maxx, maxy) VALUES('links', 1.1, 1.1, 2.2, 2.2);
string strSQL = "INSERT INTO ext(layername, minx, miny, maxx, maxy) VALUES('{0}', {1}, {2}, {3}, {4});";
strSQL = String.Format(strSQL, layername.ToLower(), mapExt.MinX, mapExt.MinY, mapExt.MaxX, mapExt.MaxY);
return this.Run(strSQL);
}
public void Update(Rectangle rect, MG_MapExtent me)
{
// FullExtent ZoomToLayer
this.CurrentWindow = rect;
this.CurrentExtent = me;
this.Calculate();
}
