VSphere Struct Reference

Classes
struct	RotateInfo

Public Member Functions
	VSphere (SkV2 center, SkScalar radius)
bool	contains (SkV2 v) const
SkV2	pinLoc (SkV2 p) const
SkV3	computeUnitV3 (SkV2 v) const
RotateInfo	computeRotationInfo (SkV2 a, SkV2 b) const
SkM44	computeRotation (SkV2 a, SkV2 b) const

Public Attributes
SkV2	fCenter
SkScalar	fRadius

Detailed Description

Definition at line 19 of file 3DSlide.cpp.

Constructor & Destructor Documentation

VSphere()

VSphere::VSphere ( SkV2  center, SkScalar  radius  )

inline

Definition at line 23 of file 3DSlide.cpp.

: fCenter(center), fRadius(radius) {}

Member Function Documentation

computeRotation()

SkM44 VSphere::computeRotation ( SkV2  a, SkV2  b  ) const

inline

Definition at line 65 of file 3DSlide.cpp.

                                                {
        auto [axis, angle] = this->computeRotationInfo(a, b);
        return SkM44::Rotate(axis, angle);
    }

computeRotationInfo()

RotateInfo VSphere::computeRotationInfo ( SkV2  a, SkV2  b  ) const

inline

Definition at line 53 of file 3DSlide.cpp.

                                                         {
        SkV3 u = this->computeUnitV3(a);
        SkV3 v = this->computeUnitV3(b);
        SkV3 axis = u.cross(v);
        SkScalar length = axis.length();
 
        if (!SkScalarNearlyZero(length)) {
            return {axis * (1.0f / length), std::acos(u.dot(v))};
        }
        return {{0, 0, 0}, 0};
    }

computeUnitV3()

SkV3 VSphere::computeUnitV3 ( SkV2  v ) const

inline

Definition at line 37 of file 3DSlide.cpp.

                                     {
        v = (v - fCenter) * (1 / fRadius);
        SkScalar len2 = v.lengthSquared();
        if (len2 > 1) {
            v = v.normalize();
            len2 = 1;
        }
        SkScalar z = SkScalarSqrt(1 - len2);
        return {v.x, v.y, z};
    }

contains()

bool VSphere::contains ( SkV2  v ) const

inline

Definition at line 25 of file 3DSlide.cpp.

                                {
        return (v - fCenter).length() <= fRadius;
    }

pinLoc()

SkV2 VSphere::pinLoc ( SkV2  p ) const

inline

Definition at line 29 of file 3DSlide.cpp.

                              {
        auto v = p - fCenter;
        if (v.length() > fRadius) {
            v *= (fRadius / v.length());
        }
        return fCenter + v;
    }

Member Data Documentation

fCenter

SkV2 VSphere::fCenter

Definition at line 20 of file 3DSlide.cpp.

fRadius

SkScalar VSphere::fRadius

Definition at line 21 of file 3DSlide.cpp.

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

• third_party/skia/tools/viewer/3DSlide.cpp