SPoint.h

/*
 * Copyright 2006 The Android Open Source Project
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef _SPoint_DEFINED_
#define _SPoint_DEFINED_
 
#include <interface/SRender-i.h>
#include <matrix/SFloat.h>
 
SNSBEGIN
 
struct SOUI_EXP SPoint : public fPoint
{
    static SPoint Make(float x, float y)
    {
        SPoint pt;
        pt.set(x, y);
        return pt;
    }
 
    static SPoint IMake(int32_t x, int32_t y)
    {
        SPoint pt;
        pt.iset(x, y);
        return pt;
    }
 
    static SPoint IMake(const POINT &src)
    {
        SPoint pt;
        pt.iset(src.x, src.y);
        return pt;
    }
 
    float x() const
    {
        return fX;
    }
    float y() const
    {
        return fY;
    }
 
    /**
     *  Returns true iff fX and fY are both zero.
     */
    bool isZero() const
    {
        return (0 == fX) & (0 == fY);
    }
 
    /** Set the point's X and Y coordinates */
    void set(float x, float y)
    {
        fX = x;
        fY = y;
    }
 
    /** Set the point's X and Y coordinates by automatically promoting (x,y) to
        float values.
    */
    void iset(int32_t x, int32_t y);
 
    /** Set the point's X and Y coordinates by automatically promoting p's
        coordinates to float values.
    */
    void iset(const POINT &p);
 
    /** Return the euclidian distance from (0,0) to the point
     */
    float length() const
    {
        return SPoint::Length(fX, fY);
    }
    /** Returns a new point whose coordinates are the negative of the point's
     */
    SPoint operator-() const
    {
        SPoint neg;
        neg.fX = -fX;
        neg.fY = -fY;
        return neg;
    }
 
    /** Add v's coordinates to the point's
     */
    void operator+=(const SPoint &v)
    {
        fX += v.fX;
        fY += v.fY;
    }
 
    /** Subtract v's coordinates from the point's
     */
    void operator-=(const SPoint &v)
    {
        fX -= v.fX;
        fY -= v.fY;
    }
 
    friend bool operator==(const SPoint &a, const SPoint &b)
    {
        return a.fX == b.fX && a.fY == b.fY;
    }
 
    friend bool operator!=(const SPoint &a, const SPoint &b)
    {
        return a.fX != b.fX || a.fY != b.fY;
    }
 
    /** Returns a new point whose coordinates are the difference between
        a's and b's (a - b)
    */
    friend SPoint operator-(const SPoint &a, const SPoint &b)
    {
        SPoint v;
        v.set(a.fX - b.fX, a.fY - b.fY);
        return v;
    }
 
    /** Returns a new point whose coordinates are the sum of a's and b's (a + b)
     */
    friend SPoint operator+(const SPoint &a, const SPoint &b)
    {
        SPoint v;
        v.set(a.fX + b.fX, a.fY + b.fY);
        return v;
    }
    /** Returns the euclidian distance from (0,0) to (x,y)
     */
    static float Length(float x, float y);
 
    /** Returns the dot product of a and b, treating them as 2D vectors
     */
    static float DotProduct(const SPoint &a, const SPoint &b);
 
    float dot(const SPoint &vec) const;
 
    POINT toPoint() const;
};
 
typedef SPoint SVector2D;
SNSEND
#endif