Class: OGR::Layer

Inherits:
Object
  • Object
show all
Defined in:
lib/ffi-ogr/layer.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ptr) ⇒ Layer

Returns a new instance of Layer.



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# File 'lib/ffi-ogr/layer.rb', line 5

def initialize(ptr)
  @ptr = FFI::AutoPointer.new(ptr, self.class.method(:release))
  #@ptr = FFI::AutoPointer.new(ptr)
  @ptr.autorelease = false
end

Instance Attribute Details

#geometry_type=(value) ⇒ Object

Sets the attribute geometry_type

Parameters:

  • value —

    the value to set the attribute geometry_type to.



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# File 'lib/ffi-ogr/layer.rb', line 3

def geometry_type=(value)
  @geometry_type = value
end

#name=(value) ⇒ Object

Sets the attribute name

Parameters:

  • value —

    the value to set the attribute name to.



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# File 'lib/ffi-ogr/layer.rb', line 3

def name=(value)
  @name = value
end

#ptr ⇒ Object

Returns the value of attribute ptr.



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# File 'lib/ffi-ogr/layer.rb', line 3

def ptr
  @ptr
end

Class Method Details

.release(ptr) ⇒ Object 



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# File 'lib/ffi-ogr/layer.rb', line 11

def self.release(ptr);end

Instance Method Details

#add_feature(feature) ⇒ Object 



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# File 'lib/ffi-ogr/layer.rb', line 65

def add_feature(feature)
  FFIOGR.OGR_L_CreateFeature(@ptr, feature.ptr)
end

#add_field(name, field_type, options = {}) ⇒ Object 



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# File 'lib/ffi-ogr/layer.rb', line 43

def add_field(name, field_type, options={})
  type = field_type.to_sym
  precision = options[:precision] || 1
  width = options[:width] || 32

  field = FFIOGR.OGR_Fld_Create(name, field_type.to_sym)

  if type == :real
    FFIOGR.OGR_Fld_SetPrecision(field, precision)
  else
    FFIOGR.OGR_Fld_SetWidth(field, width)
  end

  FFIOGR.OGR_L_CreateField(@ptr, field, 1)
  FFIOGR.OGR_Fld_Destroy(field)
end

#create_feature ⇒ Object 



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# File 'lib/ffi-ogr/layer.rb', line 60

def create_feature
  feature = FFIOGR.OGR_F_Create(FFIOGR.OGR_L_GetLayerDefn(@ptr))
  OGR::Tools.cast_feature(feature)
end

#free ⇒ Object 



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# File 'lib/ffi-ogr/layer.rb', line 13

def free
  @ptr.free
end

#get_envelope ⇒ Object Also known as: envelope 



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# File 'lib/ffi-ogr/layer.rb', line 21

def get_envelope
  envelope = FFI::MemoryPointer.new :pointer, 4
  FFIOGR.OGR_L_GetExtent(@ptr, envelope, 0)
  OGR::Envelope.new(envelope.read_array_of_double(4))
end

#get_features ⇒ Object Also known as: features 



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# File 'lib/ffi-ogr/layer.rb', line 69

def get_features
  features = []

  FFIOGR.OGR_L_ResetReading(@ptr)
  num_features = FFIOGR.OGR_L_GetFeatureCount(@ptr, 0)

  for i in (0...num_features) do
    features << OGR::Tools.cast_feature(FFIOGR.OGR_L_GetNextFeature(@ptr))
  end

  features
end

#get_geometry_type ⇒ Object Also known as: geometry_type 



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# File 'lib/ffi-ogr/layer.rb', line 33

def get_geometry_type
  FFIOGR.OGR_L_GetGeomType(@ptr)
end

#get_name ⇒ Object Also known as: name 



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# File 'lib/ffi-ogr/layer.rb', line 28

def get_name
  FFIOGR.OGR_L_GetName(@ptr)
end

#get_spatial_ref ⇒ Object Also known as: spatial_ref 



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# File 'lib/ffi-ogr/layer.rb', line 38

def get_spatial_ref
  OGR::Tools.cast_spatial_reference(FFIOGR.OGR_L_GetSpatialRef(@ptr))
end

#sync ⇒ Object 



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# File 'lib/ffi-ogr/layer.rb', line 17

def sync
  FFIOGR.OGR_L_SyncToDisk(@ptr)
end