/*

 * Copyright 2015 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SkPoint3_DEFINED

#define SkPoint3_DEFINED

#include "include/core/SkScalar.h"

#include "include/private/base/SkAPI.h"

#include "include/private/base/SkFloatingPoint.h"

struct SK_API SkPoint3 {

    SkScalar fX, fY, fZ;

    static SkPoint3 Make(SkScalar x, SkScalar y, SkScalar z) {

        SkPoint3 pt;

        pt.set(x, y, z);

        return pt;

    }

    SkScalar x() const { return fX; }

    SkScalar y() const { return fY; }

    SkScalar z() const { return fZ; }

    void set(SkScalar x, SkScalar y, SkScalar z) { fX = x; fY = y; fZ = z; }

    friend bool operator==(const SkPoint3& a, const SkPoint3& b) {

        return a.fX == b.fX && a.fY == b.fY && a.fZ == b.fZ;

    }

    friend bool operator!=(const SkPoint3& a, const SkPoint3& b) {

        return !(a == b);

    }

    /** Returns the Euclidian distance from (0,0,0) to (x,y,z)

    */

    static SkScalar Length(SkScalar x, SkScalar y, SkScalar z);

    /** Return the Euclidian distance from (0,0,0) to the point

    */

    SkScalar length() const { return SkPoint3::Length(fX, fY, fZ); }

    /** Set the point (vector) to be unit-length in the same direction as it

        already points.  If the point has a degenerate length (i.e., nearly 0)

        then set it to (0,0,0) and return false; otherwise return true.

    */

    bool normalize();

    /** Return a new point whose X, Y and Z coordinates are scaled.

    */

    SkPoint3 makeScale(SkScalar scale) const {

        SkPoint3 p;

        p.set(scale * fX, scale * fY, scale * fZ);

        return p;

    }

    /** Scale the point's coordinates by scale.

    */

    void scale(SkScalar value) {

        fX *= value;

        fY *= value;

        fZ *= value;

    }

    /** Return a new point whose X, Y and Z coordinates are the negative of the

        original point's

    */

    SkPoint3 operator-() const {

        SkPoint3 neg;

        neg.fX = -fX;

        neg.fY = -fY;

        neg.fZ = -fZ;

        return neg;

    }

    /** Returns a new point whose coordinates are the difference between

        a and b (i.e., a - b)

    */

    friend SkPoint3 operator-(const SkPoint3& a, const SkPoint3& b) {

        return { a.fX - b.fX, a.fY - b.fY, a.fZ - b.fZ };

    }

    /** Returns a new point whose coordinates are the sum of a and b (a + b)

    */

    friend SkPoint3 operator+(const SkPoint3& a, const SkPoint3& b) {

        return { a.fX + b.fX, a.fY + b.fY, a.fZ + b.fZ };

    }

    /** Add v's coordinates to the point's

    */

    void operator+=(const SkPoint3& v) {

        fX += v.fX;

        fY += v.fY;

        fZ += v.fZ;

    }

    /** Subtract v's coordinates from the point's

    */

    void operator-=(const SkPoint3& v) {

        fX -= v.fX;

        fY -= v.fY;

        fZ -= v.fZ;

    }

    friend SkPoint3 operator*(SkScalar t, SkPoint3 p) {

        return { t * p.fX, t * p.fY, t * p.fZ };

    }

    /** Returns true if fX, fY, and fZ are measurable values.

     @return  true for values other than infinities and NaN

     */

    bool isFinite() const {

        return SkIsFinite(fX, fY, fZ);

    }

    /** Returns the dot product of a and b, treating them as 3D vectors

    */

    static SkScalar DotProduct(const SkPoint3& a, const SkPoint3& b) {

        return a.fX * b.fX + a.fY * b.fY + a.fZ * b.fZ;

    }

    SkScalar dot(const SkPoint3& vec) const {

        return DotProduct(*this, vec);

    }

    /** Returns the cross product of a and b, treating them as 3D vectors

    */

    static SkPoint3 CrossProduct(const SkPoint3& a, const SkPoint3& b) {

        SkPoint3 result;

        result.fX = a.fY*b.fZ - a.fZ*b.fY;

        result.fY = a.fZ*b.fX - a.fX*b.fZ;

        result.fZ = a.fX*b.fY - a.fY*b.fX;

        return result;

    }

    SkPoint3 cross(const SkPoint3& vec) const {

        return CrossProduct(*this, vec);

    }

};

typedef SkPoint3 SkVector3;

typedef SkPoint3 SkColor3f;

#endif