DK11 for ActiveX | TatukGIS_XDK11.ITGIS_LayerPixel.Loop | Methods | Properties
Prepares enumerator to iterate the layer through the linear shape. Lines are interpreted as-line-flow for terrain profile like analysis. Pixels are treated as points.
// C# public ITGIS_LayerPixelEnumeratorFactory Loop( double _pixelsize, ITGIS_Shape _shape, WordBool _writable );
' VisualBasic Public Function Loop( ByVal _pixelsize As Double, ByVal _shape As ITGIS_Shape, ByVal _writable As WordBool ) As ITGIS_LayerPixelEnumeratorFactory
// Oxygene public function Loop( _pixelsize : Double; _shape : ITGIS_Shape; _writable : WordBool ) : ITGIS_LayerPixelEnumeratorFactory;
Name | Type | Description |
---|---|---|
_pixelsize | double Double | minimum requested size of image pixel; by providing 0 a maximum possible resolution will be used, which is also a fastest method if a layer is full in-memory because in such situation a pointer to existing memory will be used |
_shape | ITGIS_Shape | if not nil, then only pixels within the shape will be found |
_writable | WordBool | if true than layer will post back any changes in locked area; if write is not possible then TGIS_PixelItem.Writable will be set accordingly |
Type | Description |
---|---|
ITGIS_LayerPixelEnumeratorFactory | Pixel item returned row by row, column by column with the except:<list type=“bullet”><item>if _shape is liner then pixel are returned as-line-flow order.</item><item>if _shape is point or multi-point then pixels are returned in a point-by-point order</item></list> |
_pixelsize
By providing _pixelsize=0, a native layer resolution is requested. This is also the fastest method if a layer is fully in-memory because, in such situation, a pointer to existing memory is used
General way to query for terrain profile:
foreach (TatukGIS.NDK.TGIS_PixelItem px in lp.Loop(0, line, false)) { Memo.AppendText( String.Format("Distance: {0}, Height:{1}\r\n", px.Distance, px.Value) ); }
General way to query for pixels within polygon and modifying value:
foreach (TGIS_PixelItem px in lp.Loop(polygon.Extent, 0, polygon, "T", true)) { px.Color = TGIS_Color.Red; }