54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
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/** \file sr_triangle.h
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* A triangle in 3d space */
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# ifndef SR_TRIANGLE_H
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# define SR_TRIANGLE_H
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# include "sr_vec.h"
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/*! \class SrTriangle sr_triangle.h
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\brief A triangle in 3d space.
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*/
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class SrTriangle
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{ public :
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SrPnt a, b, c;
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public :
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/*! Initializes SrTriangle as the triangle (i,j,k). Implemented inline. */
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SrTriangle () : a(SrPnt::i), b(SrPnt::j), c(SrPnt::k) {}
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/*! Constructor from three points. */
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SrTriangle ( const SrPnt& p1, const SrPnt& p2, const SrPnt& p3 ) : a(p1), b(p2), c(p3) {}
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/*! Sets vertices coordinates. */
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void set ( const SrPnt& p1, const SrPnt& p2, const SrPnt& p3 ) { a=p1; b=p2; c=p3; }
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/*! Returns k, such that a*k.x + b*k.y + c*k.z == p. */
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SrVec barycentric ( const SrPnt &p ) const;
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/*! Update the position of triangle [a,b,c] in order to keep the baricentric
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coordinates of an interior point that moved. Let p=a*k.x + b*k.y + c*k.z.
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When p is displaced to p+v, the triangle vertices [a,b,c] are updated so
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to achieve a*k.x + b*k.y + c*k.z == p+v. */
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void translate ( const SrVec &k, const SrVec& v );
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/*! Apply the translation v to each triangle vertex. */
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void translate ( const SrVec& v );
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/*! Returns the normalized triangle normal. */
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SrVec normal () const;
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/*! Outputs in format: "a,b,c". */
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friend SrOutput& operator<< ( SrOutput& o, const SrTriangle& t );
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/*! Inputs from format: "a,b,c". */
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friend SrInput& operator>> ( SrInput& in, SrTriangle& t );
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};
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//============================== end of file ===============================
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# endif // SR_TRIANGLE_H
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