laRect2.h

/*

Jump'n'Run Engine
http://www.atanaslaskov.com/jnr/

BSD LICENSE
Copyright (c) 2007-2013, Atanas Laskov
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. 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 ATANAS LASKOV 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.

*/
#ifndef M_RECT_H
#define M_RECT_H



//

class laRect2
{
public:
    laPoint2 pt[2];         
    M_BOOL bInitialized;    



    laRect2(void) {
        reset();
    }

    laRect2( const laPoint2 &pos, const laPoint2 &size){
        reset();
        add( pos ); add( pos + size );
    }

    //laRect2(laPoint2 pt) { GridRect(pt); bInitialized = M_TRUE; }

    inline void reset() { bInitialized = M_FALSE; };    


    // \name Adding 2D geometry to the bounding rectangle
    inline void add( const laPoint2 &p ){
        PROFILE_COL(laRect2_add);

        if(bInitialized)
        {
            if( p.x() < pt[0].x() ) pt[0].x( p.x() );
            if( p.y() < pt[0].y() ) pt[0].y( p.y() );
            if( p.x() > pt[1].x() ) pt[1].x( p.x() );
            if( p.y() > pt[1].y() ) pt[1].y( p.y() );
        }
        else
        {
            pt[0] = pt[1] = p;
            bInitialized = M_TRUE;
        }
    }

    inline void add( const laLine2 &ln ){
        add( ln.origin );
        add( ln.end() );
    }

    inline void add( const laRect2 &r ){
        add(r.pt[0]);
        add(r.pt[1]);
    }

    inline void inflate(const laPoint2 &inf){
        add(pt[0] + inf);
        add(pt[1] + inf);
    }

    // ! Test if two rectangles are intersecting
    //
    inline M_BOOL intersecting(const laRect2 &r) const{
        PROFILE_COL(laRect2_intersecting);
        ASSERT(bInitialized, "Bounding box not initialzied");

        if(r.pt[0].x() > pt[1].x()) return M_FALSE;
        if(pt[0].x() > r.pt[1].x()) return M_FALSE;

        if(r.pt[0].y() > pt[1].y()) return M_FALSE;
        if(pt[0].y() > r.pt[1].y()) return M_FALSE;

        return M_TRUE;
    }

    // ! Offset rectangle
    //
    inline void offset(const laPoint2 &ofs) {
        pt[0] += ofs;
        pt[1] += ofs;
    }

    //Construct a standard M_UNIT rect around the point (x,y)
    void GridRect(laPoint2 &pt);

    //Construct a bounding box
    //void BoundingBox(laPoint2 a, laPoint2 b);

    //Check if the point (x,y) is outwith the rect
    /*void isSafelyOutside(laPoint2 &pt, double delta);

    //Check if the point (x,y) is within the rect
    void isSafelyInside(laPoint2 &pt, double delta);*/

    void draw(laRenderer *r, laPoint2 &pt = laPoint2());
};
#endif //#ifndef M_RECT_H