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**NAME**

SbLineProjector - TheSbLineProjectorclass projects 2D points to 3D points along a line. The 3D projection of the 2D coordinates is for this projector class constrained to lie along a pre-defined line.

**SYNOPSIS**

#include <Inventor/projectors/SbLineProjector.h> InheritsSbProjector.PublicMemberFunctionsSbLineProjector(void) virtualSbProjector*copy(void) const virtualSbVec3fproject(constSbVec2f&point) virtual SbBooltryProject(constSbVec2f&point, const float epsilon,SbVec3f&result) voidsetLine(constSbLine&line) constSbLine&getLine(void) const virtualSbVec3fgetVector(constSbVec2f&viewpos1, constSbVec2f&viewpos2) virtualSbVec3fgetVector(constSbVec2f&viewpos) voidsetStartPosition(constSbVec2f&viewpos) voidsetStartPosition(constSbVec3f&point)ProtectedAttributesSbLinelineSbVec3flastPointAdditionalInheritedMembers

**Detailed** **Description**

TheSbLineProjectorclass projects 2D points to 3D points along a line. The 3D projection of the 2D coordinates is for this projector class constrained to lie along a pre-defined line. Among other places, this is useful within the translation draggers, like for instanceSoTranslate1Dragger, where we want to move 'pieces' along one or more axes.

**Constructor** **&** **Destructor** **Documentation**

SbLineProjector::SbLineProjector(void)Constructor. Intializes the projector instance to use a line from <0, 0, 0> to <0, 1, 0>.

**Member** **Function** **Documentation**

SbProjector*SbLineProjector::copy(void)const[virtual]Construct and return a copy of this projector. The caller is responsible for destructing the new instance.NotethatiftheCoinlibraryhasbeenbuiltasaDLLunderMicrosoftWindowsandyouusethismethodfromapplicationcode,youmustmakesurethatboththeCoinDLLandtheapplicationexecutableisusingthesameinstanceofaCRun-Time(CRT)library.Otherwise,youwillgetmemoryheapcorruptionupondeallocatingthereturnedinstances,eventuallyleadingtomysteriouscrashes.ImplementsSbProjector.SbVec3fSbLineProjector::project(constSbVec2f&point)[virtual]Project the 2Dpointfrom normalized viewport coordinates to a 3D point. The mapping will be done in accordance with the type of the projector. ImplementsSbProjector.SbBoolSbLineProjector::tryProject(constSbVec2f&point,constfloatepsilon,SbVec3f&result)[virtual]Try projecting the 2Dpointfrom normalized viewport coordinates to a 3D point. The mapping will be done in accordance with the type of the projector. If the projection can't be done safely (for instance when the projection plane or line is parallel to the view volume projection), this function should return FALSE. Default implementation will callproject()and always return TRUE, but subclasses can override this behavior to support safe projections.Since:Coin 3.0 Reimplemented fromSbProjector.voidSbLineProjector::setLine(constSbLine&lineref)Set a new projection line. 3D points will be mapped to be on this line.constSbLine&SbLineProjector::getLine(void)constReturns the currently set projection line.SbVec3fSbLineProjector::getVector(constSbVec2f&viewpos1,constSbVec2f&viewpos2)[virtual]Calculates and returns a vector between the projected 3D position ofviewpos1andviewpos2.SbVec3fSbLineProjector::getVector(constSbVec2f&viewpos)[virtual]Returns the 3D vector between the last projection and the one calculated forviewpos.voidSbLineProjector::setStartPosition(constSbVec2f&viewpos)Explicitly set position of initial projection, so we get correct values for later calls togetVector()etc.voidSbLineProjector::setStartPosition(constSbVec3f&point)Explicitly set position of initial projection, so we get correct values for later calls togetVector()etc.

**Member** **Data** **Documentation**

SbLineProjector::line[protected]The projection line. Projected 3D points will be constrained to be on this line.SbLineProjector::lastPoint[protected]The last projected point.

**Author**

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