Rect.h

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/*
 Copyright (c) 2010, The Barbarian Group
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that
 the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this list of conditions and
    the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
    the following disclaimer in the documentation and/or other materials provided with the distribution.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
*/

#pragma once

#include "cinder/Vector.h"
#include "cinder/Area.h"

#include <vector>

namespace cinder {

template<typename T> class MatrixAffine2;

template<typename T>
class RectT {
 public:
    RectT() {}
    RectT( const std::vector<Vec2<T> > &points );
    RectT( T aX1, T aY1, T aX2, T aY2 ) {
        set( aX1, aY1, aX2, aY2 );
    }
    RectT( const Vec2<T> &v1, const Vec2<T> &v2 ) {
        set( v1.x, v1.y, v2.x, v2.y );
    }
    RectT( const Area &area );

    void        set( T aX1, T aY1, T aX2, T aY2 );

    T       getWidth() const { return x2 - x1; }
    T       getHeight() const { return y2 - y1; }
    T       getAspectRatio() const { return getWidth() / getHeight(); }
    T       calcArea() const { return getWidth() * getHeight(); }

    void        canonicalize(); // return rect w/ properly ordered coordinates
    RectT       canonicalized() const; // return rect w/ properly ordered coordinates
    
    void        clipBy( const RectT &clip );
    RectT       getClipBy( const RectT &clip ) const;
    Area        getInteriorArea() const;
    void        offset( const Vec2<T> &offset );
    RectT       getOffset( const Vec2<T> &off ) const { RectT result( *this ); result.offset( off ); return result; }
    void        inflate( const Vec2<T> &amount );
    RectT       inflated( const Vec2<T> &amount ) const;
    void        offsetCenterTo( const Vec2<T> &center ) { offset( center - getCenter() ); }
    void        scaleCentered( const Vec2<T> &scale );
    void        scaleCentered( T scale );
    RectT       scaledCentered( T scale ) const;
    void        scale( T scale );
    void        scale( const Vec2<T> &scale );
    RectT       scaled( T scale ) const;
    RectT       scaled( const Vec2<T> &scale ) const;

    RectT       transformCopy( const class MatrixAffine2<T> &matrix ) const;

    template<typename Y>
    bool        contains( const Vec2<Y> &pt ) const { return ( pt.x >= x1 ) && ( pt.x <= x2 ) && ( pt.y >= y1 ) && ( pt.y <= y2 ); }
    bool        intersects( const RectT &rect ) const;

    T       distance( const Vec2<T> &pt ) const;
    T       distanceSquared( const Vec2<T> &pt ) const;

    Vec2<T>     closestPoint( const Vec2<T> &pt ) const;

    T       getX1() const { return x1; }
    T       getY1() const { return y1; }
    T       getX2() const { return x2; }
    T       getY2() const { return y2; }

    Vec2<T>     getUpperLeft() const { return Vec2<T>( x1, y1 ); };
    Vec2<T>     getUpperRight() const { return Vec2<T>( x2, y1 ); };
    Vec2<T>     getLowerRight() const { return Vec2<T>( x2, y2 ); };    
    Vec2<T>     getLowerLeft() const { return Vec2<T>( x1, y2 ); }; 
    Vec2<T>     getCenter() const { return Vec2<T>( ( x1 + x2 ) / 2, ( y1 + y2 ) / 2 ); }
    Vec2<T>     getSize() const { return Vec2<T>( x2 - x1, y2 - y1 ); }

    RectT       getCenteredFit( const RectT &other, bool expand ) const;

    void        include( const Vec2<T> &point );
    void        include( const std::vector<Vec2<T> > &points );
    void        include( const RectT &rect );

    const RectT<T>      operator+( const Vec2<T> &o ) const { return this->getOffset( o ); }
    const RectT<T>      operator-( const Vec2<T> &o ) const { return this->getOffset( -o ); }
    const RectT<T>      operator*( T s ) const { return this->scaled( s ); }
    const RectT<T>      operator/( T s ) const { return this->scaled( ((T)1) / s ); }

    const RectT<T>      operator+( const RectT<T>& rhs ) const { return RectT<T>( x1 + rhs.x1, y1 + rhs.y1, x2 + rhs.x2, y2 + rhs.y2 ); }
    const RectT<T>      operator-( const RectT<T>& rhs ) const { return RectT<T>( x1 - rhs.x1, y1 - rhs.y1, x2 - rhs.x2, y2 - rhs.y2 ); }

    RectT<T>&       operator+=( const Vec2<T> &o ) { offset( o ); return *this; }
    RectT<T>&       operator-=( const Vec2<T> &o ) { offset( -o ); return *this; }
    RectT<T>&       operator*=( T s ) { scale( s ); return *this; }
    RectT<T>&       operator/=( T s ) { scale( ((T)1) / s ); return *this; }    

    T           x1, y1, x2, y2;
    
    friend std::ostream& operator<<( std::ostream &o, const RectT &rect )
    {
        return o << "(" << rect.x1 << ", " << rect.y1 << ")-(" << rect.x2 << ", " << rect.y2 << ")";
    }   

};

typedef RectT<float>    Rectf;
typedef RectT<double>   Rectd;


// This class maps a rectangle into another rectangle
class RectMapping {
 public:
    RectMapping()
        : mSrcRect( 0, 0, 0, 0 ), mDstRect( 0, 0, 0, 0 ) {}
    RectMapping( const Rectf &aSrcRect, const Rectf &aDstRect )
        : mSrcRect( aSrcRect ), mDstRect( aDstRect ) {}
    RectMapping( const Rectf &aSrcRect, const Rectf &aDstRect, bool preserveSrcAspect );
        
    Vec2f   map( const Vec2f &srcPoint ) const;
    Rectf   map( const Rectf &srcRect ) const;
    
 private:
    Rectf   mSrcRect, mDstRect;
};

extern void getClippedScaledRects( const Area &srcSurfaceBounds, const Rectf &srcRect, const Area &dstSurfaceBounds, const Area &dstArea, Rectf *resultSrcRect, Area *resultDstRect );

} // namespace cinder