KLayout Manual: Main Index » Class Index » API reference - Class SaveLayoutOptionsAPI reference - Class SaveLayoutOptionsNotation used in Ruby API documentation Description: Options for saving layouts This class describes the various options for saving a layout to a stream file (GDS2, OASIS and others). There are: layers to be saved, cell or cells to be saved, scale factor, format, database unit and format specific options. Usually the default constructor provides a suitable object. Please note, that the format written is "GDS2" by default. Either explicitly set a format using format= or derive the format from the file name using set_format_from_filename. The layers are specified by either selecting all layers or by defining layer by layer using the add_layer method. select_all_layers will explicitly select all layers for saving, deselect_all_layers will explicitly clear the list of layers. Cells are selected in a similar fashion: by default, all cells are selected. Using add_cell, specific cells can be selected for saving. All these cells plus their hierarchy will then be written to the stream file. Public constructors
Public methods
Detailed descriptionvoid add_cell(unsigned int cell_index)Description: Add a cell (plus hierarchy) to be saved The index of the cell must be a valid index in the context of the layout that will be saved. This method clears the 'select all cells' flag. void add_layer(unsigned int layer_index,const LayerInfo properties)Description: Add a layer to be saved Adds the layer with the given index to the layer list that will be written. If all layers have been selected previously, all layers will be unselected first and only the new layer remains. The 'properties' argument can be used to assign different layer properties than the ones present in the layout. Pass a default LayerInfo object to this argument to use the properties from the layout object. Construct a valid LayerInfo object with explicit layer, datatype and possibly a name to override the properties stored in the layout. [const] void assign(const SaveLayoutOptions other)Description: Assign the contents of another object to self This method assigns the contents of another object to self. This is a deep copy that does not only copy the reference but the actual content. void clear_cellsDescription: Clears all cells to be saved This method can be used to ensure that no cell is selected before add_cell is called to specify a cell. This method clears the 'select all cells' flag. This method has been added in version 0.22. void createDescription: Ensures the C++ object is created Use this method to ensure the C++ object is created, for example to ensure that resources are allocated. Usually C++ objects are created on demand and not necessarily when the script object is created. [const] double dbuDescription: Get the explicit database unit if one is set See dbu= for a description of that attribute. void dbu=(double dbu)Description: Set the database unit to be used in the stream file By default, the database unit of the layout is used. This method allows to explicitly use a different database unit. A scale factor is introduced automatically which scales all layout objects accordingly so their physical dimensions remain the same. When scaling to a larger database unit or one that is not an integer fraction of the original one, rounding errors may occur and the layout may become slightly distorted. void deselect_all_layersDescription: Unselect all layers: no layer will be saved This method will clear all layers selected with add_layer so far and clear the 'select all layers' flag. Using this method is the only way to save a layout without any layers. void destroyDescription: Explicitly destroy the object Explicitly destroy the object on C++ side if it was owned by the Ruby interpreter. Subsequent access to this object will throw an exception. If the object is not owned by Ruby, this method will do nothing. [const] bool destroyed?Description: Returns a value indicating whether the object was already destroyed This method returns true, if the object was destroyed, either explicitly or by the C++ side. The latter may happen, if the object is owned by a C++ object which got destroyed itself. [const] SaveLayoutOptions dupDescription: Creates a copy of self [const] int dxf_polygon_modeDescription: Specifies how to write polygons. See dxf_polygon_mode= for a description of this property. This property has been added in version 0.21.3. void dxf_polygon_mode=(int mode)Description: Specifies how to write polygons. The mode is 0 (write POLYLINE entities), 1 (write LWPOLYLINE entities), 2 (decompose into SOLID entities) or or 3 (write HATCH entities). This property has been added in version 0.21.3. [const] string formatDescription: Gets the format name See format= for a description of that method. void format=(string format)Description: Select a format The format string can be either "GDS2", "OASIS", "CIF" or "DXF". Other formats may be available if a suitable plugin is installed. [const] string gds2_libnameDescription: Get the library name See gds2_libname= method for a description of the library name. This property has been added in version 0.18. void gds2_libname=(string arg1)Description: Set the library name The library name is the string written into the LIBNAME records of the GDS file. The library name should not be an empty string and is subject to certain limitations in the character choice. This property has been added in version 0.18. [const] unsigned int gds2_max_cellname_lengthDescription: Get the maximum length of cell names See gds2_max_cellname_length= method for a description of the maximum cell name length. This property has been added in version 0.18. void gds2_max_cellname_length=(unsigned int arg1)Description: Maximum length of cell names This property describes the maximum number of characters for cell names. Longer cell names will be shortened. This property has been added in version 0.18. [const] unsigned int gds2_max_vertex_countDescription: Get the maximum number of vertices for polygons to write See gds2_max_vertex_count= method for a description of the maximum vertex count. This property has been added in version 0.18. void gds2_max_vertex_count=(unsigned int arg1)Description: Set the maximum number of vertices for polygons to write This property describes the maximum number of point for polygons in GDS2 files. Polygons with more points will be split. The minimum value for this property is 4. The maximum allowed value is about 4000 or 8000, depending on the GDS2 interpretation. If gds2_multi_xy_records is true, this property is not used. Instead, the number of points is unlimited. This property has been added in version 0.18. [const] bool gds2_multi_xy_recordsDescription: Get the property enabling multiple XY records for BOUNDARY elements See gds2_multi_xy_records= method for a description of this property. This property has been added in version 0.18. void gds2_multi_xy_records=(bool arg1)Description: Use multiple XY records in BOUNDARY elements for unlimited large polygons Setting this property to true allows to produce unlimited polygons at the cost of incompatible formats. Setting it to true disables the gds2_max_vertex_count setting. This property has been added in version 0.18. [const] double gds2_user_unitsDescription: Get the user units See gds2_user_units= method for a description of the user units. This property has been added in version 0.18. void gds2_user_units=(double arg1)Description: Set the users units to write into the GDS file The user units of a GDS file are rarely used and usually are set to 1 (micron). The intention of the user units is to specify the display units. KLayout ignores the user unit and uses microns as the display unit. The user unit must be larger than zero. This property has been added in version 0.18. [const] bool gds2_write_timestampsDescription: Gets a value indicating whether the current time is written into the GDS2 timestamp fields This property has been added in version 0.21.16. void gds2_write_timestamps=(bool arg1)Description: Write the current time into the GDS2 timestamps if set to true If this property is set to false, the time fields will all be zero. This somewhat simplifies compare and diff applications. This property has been added in version 0.21.16. [const] bool is_const_object?Description: Returns a value indicating whether the reference is a const reference This method returns true, if self is a const reference. In that case, only const methods may be called on self. [static] new SaveLayoutOptions newDescription: Default constructor This will initialize the scale factor to 1.0, the database unit is set to "same as original" and all layers are selected as well as all cells. The default format is GDS2. [const] bool no_empty_cellsDescription: Returns a flag indicating whether empty cells are not written. void no_empty_cells=(bool flag)Description: Don't write empty cells if this flag is set By default, all cells are written (no_empty_cells is false). This applies to empty cells which do not contain shapes for the specified layers as well as cells which are empty because they reference empty cells only. [const] int oasis_compression_levelDescription: Get the OASIS compression level See oasis_compression_level= method for a description of the OASIS compression level. void oasis_compression_level=(int arg1)Description: Set the OASIS compression level The OASIS compression level is an integer number between 0 and 10. 0 basically is no compression, 1 produces shape arrays in a simple fashion. 2 and higher compression levels will use a more elaborate algorithm to find shape arrays which uses 2nd and futher neighbor distances. The higher the level, the higher the memory requirements and run times. Setting this property clears all format specific options for other formats such as GDS. [const] bool oasis_strict_modeDescription: Gets a value indicating whether to write strict-mode OASIS files void oasis_strict_mode=(bool arg1)Description: Sets a value indicating whether to write strict-mode OASIS files Setting this property clears all format specific options for other formats such as GDS. [const] bool oasis_write_cblocksDescription: Gets a value indicating whether to write compressed CBLOCKS per cell void oasis_write_cblocks=(bool arg1)Description: Sets a value indicating whether to write compressed CBLOCKS per cell Setting this property clears all format specific options for other formats such as GDS. [const] double scale_factorDescription: Gets the scaling factor currently set void scale_factor=(double scale_factor)Description: Set the scaling factor for the saving Using a scaling factor will scale all objects accordingly. This scale factor adds to a potential scaling implied by using an explicit database unit. Be aware that rounding effects may occur if fractional scaling factors are used. By default, no scaling is applied. void select_all_cellsDescription: Select all cells to save This method will clear all cells specified with add_cells so far and set the 'select all cells' flag. This is the default. void select_all_layersDescription: Select all layers to be saved This method will clear all layers selected with add_layer so far and set the 'select all layers' flag. This is the default. void select_cell(unsigned int cell_index)Description: Selects a cell to be saved (plus hierarchy below) This method is basically a convenience method that combines clear_cells and add_cell. This method clears the 'select all cells' flag. This method has been added in version 0.22. bool set_format_from_filename(string filename)Description: Select a format from the given file name
This method will set the format according to the file's extension. It returns a value that can be used for the gzip option in Layout::write, if the file name indicates a compressed format. For example, "file.gds" will set the format to "GDS2" and return false. "file.oas.gz" will set the format to "OASIS" and return true. This method has been introduced in version 0.22. |