dnac::Triangle Class Reference

#include <Triangle.h>

Collaboration diagram for dnac::Triangle:

Public Member Functions
	Triangle (const fvec2 &a, const fvec2 &b, const fvec2 &c)
	Triangle (const std::array< fvec2, 3 > &vertices)
	Triangle (const Triangle &triangle)=default
Triangle &	operator= (const Triangle &triangle)=default
	Triangle (Triangle &&)=default
Triangle &	operator= (Triangle &&triangle)=default
fvec3	getBarycentricCoords (const fvec2 &point) const
fvec2	A () const
fvec2	B () const
fvec2	C () const

Private Attributes
fvec2	a
fvec2	v0
fvec2	v1
float	d00
float	d01
float	d11
float	denom

Constructor & Destructor Documentation

Triangle() [1/4]

dnac::Triangle::Triangle	(	const fvec2 &	a,
		const fvec2 &	b,
		const fvec2 &	c
	)

                                                                  :
    a{a_},
    v0{b - a},
    v1{c - a},
    d00{tdm::dot(v0, v0)},
    d01{tdm::dot(v0, v1)},
    d11{tdm::dot(v1, v1)},
    denom{d00 * d11 - d01 * d01} {
}

Triangle() [2/4]

dnac::Triangle::Triangle ( const std::array< fvec2, 3 > &  vertices )

explicit

                                                     :
    Triangle(vertices[0], vertices[1], vertices[2]) {
}

Triangle() [3/4]

dnac::Triangle::Triangle ( const Triangle &  triangle )

default

Triangle() [4/4]

dnac::Triangle::Triangle ( Triangle &&  )

default

Member Function Documentation

A()

fvec2 dnac::Triangle::A

(

)

const

                        {
    return a;
}

References a.

B()

fvec2 dnac::Triangle::B

(

)

const

                        {
    return v0 + a;
}

References a, and v0.

C()

fvec2 dnac::Triangle::C

(

)

const

                        {
    return v1 + a;
}

References a, and v1.

getBarycentricCoords()

fvec3 dnac::Triangle::getBarycentricCoords

(

const fvec2 &

point

)

const

                                                             {
    // Real-Time Collision Detection The Morgan Kaufmann Series, chapter 3.4 Barycentric Coordinates
    const fvec2 v2 = point - a;
 
    const float d20 = tdm::dot(v2, v0);
    const float d21 = tdm::dot(v2, v1);
 
    const float v = (d11 * d20 - d01 * d21) / denom;
    const float w = (d00 * d21 - d01 * d20) / denom;
    const float u = 1.0f - v - w;
    return {u, v, w};
}

References a, d00, d01, d11, denom, tdm::dot(), v0, and v1.

operator=() [1/2]

Triangle & dnac::Triangle::operator= ( const Triangle &  triangle )

default

operator=() [2/2]

Triangle & dnac::Triangle::operator= ( Triangle &&  triangle )

default

Member Data Documentation

a

fvec2 dnac::Triangle::a

private

Referenced by A(), B(), C(), and getBarycentricCoords().

d00

float dnac::Triangle::d00

private

Referenced by getBarycentricCoords().

d01

float dnac::Triangle::d01

private

Referenced by getBarycentricCoords().

d11

float dnac::Triangle::d11

private

Referenced by getBarycentricCoords().

denom

float dnac::Triangle::denom

private

Referenced by getBarycentricCoords().

v0

fvec2 dnac::Triangle::v0

private

Referenced by B(), and getBarycentricCoords().

v1

fvec2 dnac::Triangle::v1

private

Referenced by C(), and getBarycentricCoords().

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The documentation for this class was generated from the following files:

• Triangle.h
• Triangle.cpp