impeller::Trig Struct Reference

A structure to store the sine and cosine of an angle. More...

#include <trig.h>

Public Member Functions
	Trig (Radians r)
	Construct a Trig object from a given angle in radians. More...
	Trig (double cos, double sin)
	Construct a Trig object from the given cosine and sine values. More...
Vector2	operator* (const Vector2 &vector) const
	Returns the vector rotated by the represented angle. More...
Trig	operator- () const
	Returns the Trig representing the negative version of this angle. More...
Vector2	operator* (double radius) const
	Returns the corresponding point on a circle of a given |radius|. More...
Vector2	operator* (const Size &ellipse_radii) const
	Returns the corresponding point on an ellipse with the given size. More...

Public Attributes
double	cos
double	sin

Detailed Description

A structure to store the sine and cosine of an angle.

Definition at line 16 of file trig.h.

Constructor & Destructor Documentation

Trig() [1/2]

impeller::Trig::Trig ( Radians  r )

inlineexplicit

Construct a Trig object from a given angle in radians.

Definition at line 18 of file trig.h.

      : cos(std::cos(r.radians)), sin(std::sin(r.radians)) {}

Referenced by operator-().

Trig() [2/2]

impeller::Trig::Trig ( double  cos, double  sin  )

inline

Construct a Trig object from the given cosine and sine values.

Definition at line 22 of file trig.h.

: cos(cos), sin(sin) {}

Member Function Documentation

operator*() [1/3]

Vector2 impeller::Trig::operator* ( const Size &  ellipse_radii ) const

inline

Returns the corresponding point on an ellipse with the given size.

Definition at line 43 of file trig.h.

                                                     {
    return Vector2(static_cast<Scalar>(cos * ellipse_radii.width),
                   static_cast<Scalar>(sin * ellipse_radii.height));
  }

References cos, impeller::TSize< T >::height, sin, and impeller::TSize< T >::width.

operator*() [2/3]

Vector2 impeller::Trig::operator* ( const Vector2 &  vector ) const

inline

Returns the vector rotated by the represented angle.

Definition at line 28 of file trig.h.

                                                 {
    return Vector2(static_cast<Scalar>(vector.x * cos - vector.y * sin),
                   static_cast<Scalar>(vector.x * sin + vector.y * cos));
  }

References cos, sin, impeller::TPoint< T >::x, and impeller::TPoint< T >::y.

operator*() [3/3]

Vector2 impeller::Trig::operator* ( double  radius ) const

inline

Returns the corresponding point on a circle of a given |radius|.

Definition at line 37 of file trig.h.

                                         {
    return Vector2(static_cast<Scalar>(cos * radius),
                   static_cast<Scalar>(sin * radius));
  }

References cos, and sin.

operator-()

Trig impeller::Trig::operator- ( ) const

inline

Returns the Trig representing the negative version of this angle.

Definition at line 34 of file trig.h.

{ return Trig(cos, -sin); }

References cos, sin, and Trig().

Member Data Documentation

cos

double impeller::Trig::cos

Definition at line 24 of file trig.h.

Referenced by operator*(), operator-(), and impeller::testing::TEST().

sin

double impeller::Trig::sin

Definition at line 25 of file trig.h.

Referenced by operator*(), operator-(), and impeller::testing::TEST().

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The documentation for this struct was generated from the following file:

• impeller/geometry/trig.h