DG Kernel Documentation

IView2 interface allows enabling or disabling functionality related to the viewing properties of the relevant display window. Currently it controls disabling and enabling of Viewing mouse transformations ( Pan/Rotate/Zoom) and enabling/disabling of highlighting of the current object in "Modify" mode (See IViewModal). By default all types of viewing transformations are enabled.

IView2 can be queried from IView interface

HRESULT Enable( int nFlags, VARIANT_BOOL bEnable )

Parameters

nFlags -[in] flags indicating the functionality to enable or disable. See remarks.

bEnable - [in] . The functionality will be enabled (default) if this parameter is true and disabled otherwise.

Returns

S_OK in case of success.

Remarks

nFlags parameter can be one of EEnableBit members: EEnableBit.eEnablePan ( value=1 ), EEnableBit.eEnableZoom (value = 2), EEnableBit.eEnableRotate (value=4), EEnableBit.eEnableHighLightSurface (value=512), EEnableBit.eEnableTransparency (value=1024) or OR-ed combination of them. .

Using this method with the first three values of the nFlags allows disabling of Pan/Zoom/Rotate viewing manipulations performed on mouse movements. EEnableBit.eEnableHighLightSurface flags enables or disables highlighting the current object in "Modify" mode (See IViewModal and IModel2)).

EEnableBit.eEnableTransparency (value=1024) enables rendering of objects with alpha material color component < 1 as transparent

EEnableBit.eEnablePerspectiveProjection (value=2048) changes view to prospective mode, where objects, which are further from the viewer appear smaller on the screen. Prospective mode is recommended for viewing only and is not fully supported in this release. Contact us for more information.

EEnableBEEnableBit.eEnableNormals (value=4096) turns on / off visibility on normals in the 3D view

HRESULT GetEnableFlag( int nFlag, VARIANT_BOOL *pbEnable )

Parameters

nFlag - [in] flag to retrieve.

pbEnable - [out] pointer to a Boolean variable, which will be set to true if the flag is enabled and false otherwise.

Return Values

S_OK in case of success.

Remarks

This method returns the current value of the flag. See remarks for the previous method.

HRESULT Reset(VARIANT_BOOL redraw)

Parameters

redraw - [in] if false the control's window will not be redrawn.

Return Values

S_OK in case of success.

Remarks

This method resets zoom of the view to fit the model into the window and sets point of view to default. The method can be used to programmatically restore initial zoom and orientation after extensive viewing transformations. It is also useful to fit model into the view when size of the model has been changed programmatically. redraw parameter can be used to avoid flickering before some programmatic manipulations of the view.

HRESULT ResetEx(EViewReset action)

Parameters

action - [in] Type of reset to perform

Remarks

When action is eViewResetAll the result is equivalent to call Reset(false) of the previous method.

When action is eViewResetVolume the model will be refit into the window to be fully visible as if on the start of the application, but its current orientation will be preserved.

In more technical terms it means that only Viewing Volume will be modified to center it around the model. Position and orientation of Global and Eye frames will remain unchanged.

HRESULT GetViewType(int *type)

Parameters

type - [out, retval] Current type of the view. Possible return values are enumerated in EViewType enumeration

Remarks

Returns the current type of the view. Possible types are enumerated in EViewType enumeration

HRESULT SetViewType(int type)

Parameters

type - [in] Type of view to activate. Possible types are enumerated in EViewType enumeration

Remarks

This method is not supported in this version

HRESULT AddExternalModel(IModel *model)

Parameters

model - [in] IModel implemented by an external model. See remarks.

Remarks

The method attaches model as an external model to the component which implements this interface. When there is one or more external models attached to the component where this IView2 was queried from on every UpdateSurface call all objects of all external models are replicated and the new copies are added to the main model of the component, which is the model returned by GetModel() method. The replicas added by the pervious call to UpdateSurface are removed before the operation.

The above mechanism allows incorporating model loaded / created independently of the current component or creating multiple views of the same model probably with different display type or point of view.

Note that objects of the external models are. added "By Value", which means that any modifications made to the external model appear in this component only after an UpdateSurface call, not automatically.

HRESULT ShowHideAll(VARIANT_BOOL show)

Remarks

Shows or hides all items in the model

HRESULT GoTo(IItem* iObject)

Remarks

Performs pan and zoom as necessary to focus on the object ( more precisely to fit the object in the window with default margins). Orientation of the view remains the same

HRESULT GetGraphicItem(IObject_KC* object, IGraphicItem** item)

Creates a graphic item for the object and attaches this view to it