Wizt::Brush Struct Reference

A data-driven description of a Brush to select points from a set of points, providing an list of indices. More...

#include <ocean/Anemonia/Brush.hpp>

Classes
struct	Metric
	For analytical shapes of a brush, allows to model spheres, ellipsoids, ellipses, cylinders... More...

Public Member Functions
RefPtr< Eagle::BoundingBox >	computeBoundingBoxInScreenOverlaySpace () const
	The shape of the brush extruded in depth, given in overlay coordinates on the screen.
RefPtr< Eagle::BoundingBox >	computeBoundingBoxInWorldSpace () const
	The bounding box of the brush as it appears in world coordinates which will naturally have larger volume than in screen space to encompass perspective effects.
PointDataChunk	getBrushInWorldSpace (double screen_depth) const
	Get the selection polygon in world space using the current view with screen depth between 0.0 (front cutoff of the view volume) and 1.0 (back cutoff of the view volume).
RefPtr< Chunk< size_t > >	getSelection (const RefPtr< Chunk< Eagle::PhysicalSpace::point > > &WorldCoordinates, const std::function< bool(Eagle::PhysicalSpace::point)> &RegionOfInterest) const
	The core function: Given a chunk of world coordinates, determine the indices of the points that are selected by this brush (the polygon coordinates and the projection in ScreenView ).
	operator bool () const
	Check whether this Brush is valid.
bool	operator! () const
	Check whether this Brush is invalid.

Static Public Member Functions
static void	connectBrushAsInput (VObject *Owner, TypedSlot< Brush > &inBrush, const string &BrushCreatorName="Brush")
	To automatically connect a Brush instance to a VObject that uses a brush, call this function in the constructor of the respective VObject.

Public Attributes
PointDataChunk	PolygonOnScreen
	Points of the brush outline in OverlayCoordinate.

Detailed Description

A data-driven description of a Brush to select points from a set of points, providing an list of indices.

Call Brush::connectBrushAsInput() in a VObject using a Brush as input to automatically have it connect to an existing Brush instance or to create one if none exists yet.

Member Function Documentation

computeBoundingBoxInScreenOverlaySpace()

RefPtr< BoundingBox > Wizt::Brush::computeBoundingBoxInScreenOverlaySpace

(

)

const

The shape of the brush extruded in depth, given in overlay coordinates on the screen.

Don't confuse with pointer coordinates on the screen, use OverlayToPointer() to convert into pointer coordinates.

References Wizt::View::CameraSettings, Eagle::norm(), Eagle::P0(), Eagle::P1(), PolygonOnScreen, and Wizt::VCamera::viewdir().

Referenced by computeBoundingBoxInWorldSpace().

connectBrushAsInput()

void Wizt::Brush::connectBrushAsInput ( VObject *  Owner, TypedSlot< Brush > &  inBrush, const string &  BrushCreatorName = "Brush"  )

static

To automatically connect a Brush instance to a VObject that uses a brush, call this function in the constructor of the respective VObject.

If no Brush exists yet, it will be created.

This function utilites the VObject::addSetup() function to find a unique object that provides a Brush, and if found, attaches it as input, otherwise it creates a new object fitting the Brush, equivalent to the following code segment:

        Owner->addSetup( [Owner, BrushCreatorName, &inBrush](const VObject::CreationSlots_t&)
{
        if (RefPtr<VParameter> haveBrush = Owner->findUniqueOutputObject( typeid(Brush) ) )
                Owner->attach( inBrush->getParameter() , haveBrush);
        else
                Owner->attachNewObject(inBrush, BrushCreatorName );
}
);

References Wizt::VConnectable::attach(), Wizt::VObject::attachNewObject(), and Wizt::VObject::findUniqueOutputObject().

getSelection()

RefPtr< Chunk< size_t > > Wizt::Brush::getSelection	(	const RefPtr< Chunk< Eagle::PhysicalSpace::point > > &	WorldCoordinates,
		const std::function< bool(Eagle::PhysicalSpace::point)> &	RegionOfInterest
	)		const

The core function: Given a chunk of world coordinates, determine the indices of the points that are selected by this brush (the polygon coordinates and the projection in ScreenView ).

An optional arbitrary function to constrain the region of interest may be specified additionally.

References PolygonOnScreen.