igds_type: igds_shared_cell
Shared cells correspond to IGDS element type 34 and 35. They consist of two parts: the definition (Type 34) and the element (Type 35). The definitions list the component elements of the cells. The elements are made up of an insertion point as well as rotation and scaling parameters. The IGDS reader skips all elements that define the cell and only processes the element features as point features that have only a single coordinate.
If the Expand Named Cells parameter is set to Yes, then the shared cells are expanded into its pieces; otherwise only the cell insertion point is output for each shared cell instance. Expansion of shared cells is supported by both V7 and V8.
The DGNV8 writer can write shared cells, while the IDGS V7 write creates unshared cells from shared cell features.
Shared cell instances have the following attributes:
|
Attribute Name |
Contents |
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igds_cell_name |
The name of the cell. Corresponds to the name of the cell in a cell library. Range: Character String Default: No default |
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igds_cell_x_scale igds_cell_y_scale igds_cell_z_scale |
The scaling factors to apply to the cell. This value may be overridden by the igds_cell_size attribute. Similarly, these factors will not be used to calculate the cell header scale if the igds_cell2DTMat* or igds_cell3DTMat* attributes are present. Range: Any real number > 0 Default: 1 |
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igds_cell_size |
The size in ground units of the maximum span of the cell. If this is specified, the settings for igds_cell_x_scale, igds_cell_y_scale, and igds_cell_z_scale are ignored. If it is not specified, then the scaling factors described above are used. This attribute is not assigned any value by the reader. Range: Any real numbers > 0 Default: No default |
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igds_rotation |
The rotation of the entire cell. The rotation is measured in degrees counterclockwise up from horizontal. Range: -360.0..360.0 Default: 0 Reprojectable: Yes |
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igds_sharedcell_description (applicable only to Shared Cells) |
The description of the cell. (Supported for version 8 DGN files only.) Range: Character String Default: No default |
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igds_cell_num_members |
Stores a cell’s total number of members. Range: Any real numbers > 0 Default: No default |
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igds_text_string{#} |
When reading only, this contains the text string of the #th text element in the cell. Range: Any string |
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igds_cell_sequence_number |
When reading only with the Expand Named Cells parameter set to Yes, this contains a unique number that can be used to regroup a cell with its component elements. |
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igds_cell_size_x |
This is the difference of minX and maxX stored in ground units. Note: If igds_cell_size_x and igds_cell_size_y are both specified, then igds_cell_size_x_scale, igds_cell_size_y_scale and igds_cell_size_z_scale values are ignored. Reprojectable: Yes |
|
igds_cell_size_y |
This is the difference of minY and maxY stored in ground units. Reprojectable: Yes |
|
igds_cell_num_members |
Stores a cell’s total number of members. Range: Any real numbers > 0 Default: No default |
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igds_unnamedcell_num_of_elements |
Stores number of elements of an unnamed cell (group) Range: Any real numbers > 0 Default: No default |
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igds_cell_insertion_x igds_cell_insertion_y igds_cell_insertion_z |
Stores cell insertion point Range: Any real number Default: No default |
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igds_cell_element_class igds_cell_element_style igds_cell_element_color igds_cell_element_weight igds_cell_element_level igds_cell_element_level_name |
Stores some standard properties of the first element of a graphic cell, when reading. These are only set if the cell is not set to be expanded into component elements, since equivalent properties can be found as standard properties of each of those elements in that case. Default: No default |
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igds_cell2DTMat11 igds_cell2DTMat12 igds_cell2DTMat21 igds_cell2DTMat22 |
Cell’s 2D matrix containing rotation and scale information.
If this is specified, the settings for igds_cell_x_scale, igds_cell_y_scale, and igds_cell_z_scale are ignored for the purpose of setting the cell header scale.
Default: No default |
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igds_cell3DTMat11 igds_cell3DTMat12 igds_cell3DTMat13 igds_cell3DTMat21 igds_cell3DTMat22 igds_cell3DTMat23 igds_cell3DTMat31 igds_cell3DTMat32 igds_cell3DTMat33 |
Cell’s 3D matrix containing rotation and scale information.
If this is specified, the settings for igds_cell_x_scale, igds_cell_y_scale, and igds_cell_z_scale are ignored.
Default: No default
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