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TGIS_LayerVector.cursorFindFirst method

DK11 for Java | tatukgis.jdk.TGIS_LayerVector.cursorFindFirst | Constructors | Fields | Methods | Properties | Events

Find first occurrence of an item which meets extent and query. Will use RTree if available.

Available also on: Delphi | .NET.


// Java
protected TGIS_Shape cursorFindFirst(
  int _cursor,
  bool _viewerCS,
  TGIS_Extent _extent,
  java.lang.String _query,
  TGIS_Shape _shape,
  java.lang.String _de9im,
  bool _skipDeleted
// Oxygene
  function cursorFindFirst(
    _cursor : Integer;
    _viewerCS : Boolean;
    _extent : TGIS_Extent;
    _query : String;
    _shape : TGIS_Shape;
    _de9im : String;
    _skipDeleted : Boolean
  ) : TGIS_Shape; virtual;


Name Type Description
_cursor int
cursor identifier (see TGIS_LayerVector.cursorOpen)
_viewerCS bool
if True an the layer has been attached to the Viewer then expected _extent units are in a Viewer coordinate space; otherwise expected _extent units are in a Layer coordinate space
_extent TGIS_Extent extent of item to be found
_query java.lang.String
query which must be matched by item; closely mimics SQL WHERE clause; for examples you can use 'AGE >= 18'; empty (default) means that no all items will match.
_shape TGIS_Shape if not nil, then only shapes matched _de9im matrix with _shape will be found
_de9im java.lang.String
DE-9IM matrix of comparison
_skipDeleted bool
set a skip deleted treatment; by default deleted items will be ignored


Type Description
TGIS_Shape Shape itself or nil.


Use this method to find to the first shape in the layer matching given criteria. Using _query param we can narrow the result of the shape searching down to the minimum. This should speed up our process of locating a desirable shape.

2020/05/07 01:13

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