DG Kernel (ActiveX) Documentation

Upgrading Native Apps

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Model Properties

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Persistent Measurements

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Operations and Algorithms

Boolean Operations

Euclidean Shortest Path

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Kinematic Entities

Collision Detection

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Import/Export Overview

Data Flow Sample

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DG Kernel Controls

DG Kernel Control

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Properies, Methods, Events

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Interactive Functionality

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Modes of DG Kernel

Current Entities

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View of DGK Control

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Selection Overview

Selection Event

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Auxiliary Views

Full Screen window

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Programmatic Functionality

Object Construction

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General Geometry

IPointMatrix_DG

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IBSplineCurve_DG

IBSplineCurveInterpolator_DG

ICurveFreeForm_DG

IArcSpline3DCurve_DG

IBSplineCurve2d_DG

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IPartialSplineProps_DG

IBSplineSurface_DG

IBezierSurface_DG

IPartialBezierProps_DG

ISurfaceOfRevolution_DG

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Oriented Objects

IObjectOriented_DG

IGeometricObject_DG

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IEntityArray_DG

IStdShapeRef_DG

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IPointSetGeometry_DG

ISegmentStripGeometry_DG

ICurveGeometry_DG

ISurfacePoint_DG

ISurfacePointArray_DG

ILabelGeometry_DG

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BSpline BRep Geometry

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Advanced Algorithms

IBRepChamfer_DG

IBRepDraftAngle_DG

IFeaturePrism_DG

IBRepCompositeSolid_DG

IBRepCompound_DG

IBRepBuilderEx_DG

IWireArrayToSurfaceBuilder_DG

IBRepGeometry_DG

IBRepBuilder_DG

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IMeshGeometry_DG

IVertexSegment_DG

IDiffSurface_DG

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Collision Detection

IPathCollisionDetector_DG

IKinematicEntity_DG

IKinematicSet_DG

IDynamicScreenItem_DG

IDynamicScreenItemManager_DG

ISmartLabelManager_DG

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Import / Export

IDataContext_DG

ISTLDataContext_DG

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Operations and Agorithms

IBooleanEntity_DG

IEuclideanShortestPath_DG

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ILightSource_DG

IViewPointArray_DG

IMeasurement_DG

IRectangleColor_DG

IVirtualView_DG

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General Computing

IObjectGenerator_DG

IControlInitialisationContext_DG

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Samples and Tutorials

Delphi and C++ Samples

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Perspective View

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Mathematical Objects

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Curve Technologies

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Zoom Sample

C# Implementation details

All implementation is contained in the main form class named ZoomForm.

OnZoom() handler converts screen coordinates of the zoom center to global 3D coordinates using IView_DG.ScreenTo3DEx. The point has to be converted to local to the Eye frame to use the ILook.ZoomEx method. This is accomplished via IFrameEx.ToLocal.for the IFrame of the Eye Frame.

See also All C# samples