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DATAKIT API
V2025.3
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DATAKIT API
V2025.3
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Writing FDT as Symbols (Full Graphics or Polylines). Writing of Semantics applies with AP203E2 and later.
To switch on/off this mode, Settings : before starting the STEP writer, call (after stepw_InitFile and before any other writing action) :
stepw_SetModeFdt(inMode,inPolyline) .
inMode in an integer value to drive writing of FDT globally, it can have one of these values
When this mode is active, the STEP schema used for writing the file is defaulted to AP242.
inPolyline is an integer value to drive writing of graphics of FDT, it can have one of these values
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_Component:Dtk_Info:Dtk_PMIGlobalStandard | product (id=FDT standard) + document_product_equivalence + product_definition_context_association .. | Fdt Standard : ISO / ASME |
| (Dtk_Text) length/angle value | measure_representation_item | |
| Dtk_Text:Dtk_Info: DtkPrecision | value_format_type_qualifier | nb of significant digits |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_Fdt (as a symbol) | leader_directed_callout | converted to Dtk_Symbol (graphic mode) |
| Each graphical item of the 2dEntity | annotation_occurrence or sub-type | Items are : texts, leaders, other geometries |
| Transformation of the Dtk_Fdt : Dtk_transfo | - Text : position of the text : axis2_placement_3d - others : integrated in 3D coordinates | |
| Writing mode : FDT graphics as polyline | geometric_curve_set + list of polyline | all texts, symbols, leaders, geometries |
| Writing mode : FDT graphics as tessellation | tessellated_geometric_set + list of tessellated_curve_set & complex_triangulated_surface_set | AP242 - all texts, symbols, leaders, geometries |
| Writing mode : FDT graphics as placeholder (from AP242E2) | annotation_placeholder_occurrence with : position, character height, attachment points (leader ends) | AP242E2 - minimal presentation; full presentation to be recomputed by the reader |
| Writing mode : FDT graphics as placeholder (from AP242E3) | annotation_placeholder_occurrence_with_leader_line with : position, character height, points of leader lines | AP242E3 - enhanced placeholder introduced in AP242E3 |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_NodeConnector (only within a Part) | shape_aspect + geometric_item_specific_usage (to the 3D)
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| Dtk_NodeConnector with Path | component_path_shape_aspect + multi_level_reference_designator | AP242 - monolithic mode only |
| Dtk_Fdt (Tolerance) with no Geometrical Link | attached to the whole Product |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Leader Curve : general | - Geometry : a dedicated annotation_curve_occurrence - Terminator : annotation_symbol_occurrence / terminator_symbol | |
| Leader Curve : definition of the terminator | defined_symbol (gathers the definition) designated by the terminator_symbol : - pre_defined_terminator_symbol : type of the terminator - symbol_target : size of the terminator - symbol_style , symbol_colour : style of the terminator (color) | |
| Leader Curve : Geometry | an individual item designated by the annotation_curve_occurrence | see below |
(only in mode Polyline)
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Geometrical Items not Leader Curves | one annotation_curve_occurrence to gather them | designates the item or list of items |
| style of curve(s) (color, thickness, font) | curve_style , draughting_pre_defined_curve_font | common to the whole annotation |
| style of point(s) (color, marker) | point_style , pre_defined_marker | common to the whole annotation |
| case of several Geometrical Items | geometric_curve_set | lists the individual items |
| each Geometrical Item : Line or Polyline | polyline | |
| each Geometrical Item : Circle or Arc of Circle | circle if complete, or trimmed_curve(circle) if arc |
(only in mode Character Based)
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_CompositeText : general | annotation_text_occurrence | one per common definition of characters (size ..) |
| Definition of characters | text_style_with_box_characteristics | (height, width, slant, rotate angle) |
| Style of the text | test_style_for_defined_font | (color) |
| case of several Dtk_Text | composite_text | lists the individual texts |
| each Dtk_Text, general case | text_literal | |
| each Dtk_Text, with a frame | text_literal_with_delineation |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| in Dtk_Component:GetInfos, parameter "Dtk_PMIGlobalStandard" | product + application_context "geometrical dimensioning and tolerancing rpresentation"
| defines the FDT Standard (ISO 1101 or ASME Y14) |
| parameter "Dtk_PMIGlobalStandard" = "ISO" | FDT Standard : ISO | |
| parameter "Dtk_PMIGlobalStandard" = "ASME" | FDT Standard : ASME |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_Fdt + Dtk_Symbol typed TypeDatum (Simple Datum) | datum + datum_feature | a datum embeds the geometrical link (acts as a shape aspect) |
| Dtk_Fdt + Dtk_DatumTarget | placed_datum_target_feature | |
| Dtk_Fdt + Dtk_Region | geometry (Dtk_Face) as construction geometry |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_Dimension as a size | dimensional_size , angular_size | on one set of 3d items |
| Dtk_Dimension as a distance | dimensional_location , angular_location | between 2 sets of 3d items |
| DimensionType of the Dtk_Dimension | field "name" of the dimensional_size or dimensional_location | Chamfer out of scope of the standard |
| for each value (nominal, mini, maxi, plus, minus) | length_measure_with_unit , plane_angle_measure_with_unit | role : see below |
| for each value , number of significant digits (when known) | value_format_type_qualifier | determined from Dtk_Info:DtkPrecision |
| nominal value | one value in the dimension, named "nominal value" | |
| nominal value in a rectangular frame | one value in the dimension + modifier "theoretical" | |
| nominal value between parentheses | one value in the dimension + modifier "auxiliary" | |
| tolerance as plus value and minus value | plus_minus_tolerance + tolerance_value | |
| tolerance as tabulated (standardized text) | plus_minus_tolerance + limits_and_fits | |
| 2 values mini-maxi | one value in the dimension, named "lower limit" and "upper limit" | |
| one value "MINI" | one value in the dimension + type_qualifier "minimum" | |
| one value "MAXI" | one value in the dimension + type_qualifier "maximum" | |
| additional : suffix ( Ⓔ Ⓘ ) | name of the shape_dimension_representation | resp. "envelope requirement" or "independency" |
| additional : prefix (CR square), suffix (others) | descriptive_representation_item (text) for modifier |
From AP242 - previously ignored (considered as just graphics)
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_Symbol with a list of Dtk_Text | property_definition_representation + property_definition, name = "semantic text" | AP242 |
| list of Dtk_Text | representation + list of descriptive_representation_item | AP242 |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_AxisSystem | axis2_placement_3d + constructive_geometry_representation + constructive_geometry_representation_relationship | |
| Construction Geometry in the Dtk_FdtAnnotationSet | (this geometry) + constructive_geometry_representation + constructive_geometry_representation_relationship | infinite geometry : only the curve/surface is written |
| Dtk_Body in a Dtk_Node of sub-type DTK_NODE_FDT | (this geometry) + constructive_geometry_representation + constructive_geometry_representation_relationship | infinite geometry : only the curve/surface is written |
| Dtk_Body : Infinite Geometry | (this geometry) + constructive_geometry_representation + constructive_geometry_representation_relationship |
| DATAKIT Class | STEP Entity | Remarks |
|---|---|---|
| Dtk_ModelDisplay | camera_model_d3 + draughting_model | lists the annotations in the view + the 3D main model |
| Dtk_ModelDisplay with a Clipping Plane | camera_model_d3_multi_clipping + plane + draughting_model | Section View - limited to one clipping plane |
| parameters of the view | view_volume , planar_box | |
| status "active" of the ModelDisplay | default_model_geometric_view | From AP242E2 - only one per component |
| in the Dtk_Node : NodeConnector "forceHidden" with instance path | context_dependent_over_riding_styled_item + invisibility listed in the draughting_model | |
| in the root Dtk_Component : Dtk_Override/Dtk_OverrideSet with Dtk_Info (color) and NodeConnector (instance path) | context_dependent_over_riding_styled_item + styled_item(color) listed in the draughting_model | syntax stepw_AddOverrideInstanceInfo
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