libreoffice/canvas/source/tools/surfacerect.hxx

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 * Copyright 2008 by Sun Microsystems, Inc.
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 * OpenOffice.org - a multi-platform office productivity suite
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 * $RCSfile: surfacerect.hxx,v $
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#ifndef INCLUDED_CANVAS_SURFACERECT_HXX
#define INCLUDED_CANVAS_SURFACERECT_HXX

#include <basegfx/point/b2ipoint.hxx>
#include <basegfx/vector/b2isize.hxx>

namespace canvas
{
    //////////////////////////////////////////////////////////////////////////////////
    // SurfaceRect
    //////////////////////////////////////////////////////////////////////////////////

    struct SurfaceRect
    {
        ::basegfx::B2IPoint maPos;
        ::basegfx::B2ISize  maSize;
        ::basegfx::B2IPoint maBackup;
        bool                bEnabled;

        explicit SurfaceRect( const ::basegfx::B2ISize &rSize ) :
            maPos(),
            maSize(rSize),
            maBackup(),
            bEnabled(true)
        {
        }

        // coordinates contained in this rectangle are
        // constrained to the following rules:
        // 1) p.x >= pos.x
        // 2) p.x <= pos.x+size.x
        // 3) p.y >= pos.y
        // 4) p.y <= pos.y+size.y
        // in other words, 'size' means the number of pixels
        // this rectangle encloses plus one. for example with pos[0,0]
        // and size[512,512], p[512,512] would return inside.
        // a size of [0,0] therefore denotes a one-by-one rectangle.
        bool pointInside( sal_Int32 px, sal_Int32 py ) const
        {
            const sal_Int32 x1(maPos.getX());
            const sal_Int32 y1(maPos.getY());
            const sal_Int32 x2(maPos.getX()+maSize.getX());
            const sal_Int32 y2(maPos.getY()+maSize.getY());
            if(px  < x1) return false;
            if(px >= x2) return false;
            if(py  < y1) return false;
            if(py >= y2) return false;
            return true;
        }

        // returns true if the horizontal line intersects the rect.
        bool hLineIntersect( sal_Int32 lx1, sal_Int32 lx2, sal_Int32 ly ) const
        {
            const sal_Int32 x1(maPos.getX());
            const sal_Int32 y1(maPos.getY());
            const sal_Int32 x2(maPos.getX()+maSize.getX());
            const sal_Int32 y2(maPos.getY()+maSize.getY());
            if(ly < y1) return false;
            if(ly >= y2) return false;
            if((lx1 < x1) && (lx2 < x1)) return false;
            if((lx1 >= x2) && (lx2 >= x2)) return false;
            return true;
        }

        //! Returns true if the vertical line intersects the rect.
        bool vLineIntersect( sal_Int32 lx, sal_Int32 ly1, sal_Int32 ly2 ) const
        {
            const sal_Int32 x1(maPos.getX());
            const sal_Int32 y1(maPos.getY());
            const sal_Int32 x2(maPos.getX()+maSize.getX());
            const sal_Int32 y2(maPos.getY()+maSize.getY());
            if(lx < x1) return false;
            if(lx >= x2) return false;
            if((ly1 < y1) && (ly2 < y1)) return false;
            if((ly1 >= y2) && (ly2 >= y2)) return false;
            return true;
        }

        // returns true if the passed rect intersects this one.
        bool intersection( const SurfaceRect& r ) const
        {
            const sal_Int32 x1(maPos.getX());
            const sal_Int32 y1(maPos.getY());
            const sal_Int32 x2(maPos.getX()+maSize.getX());
            const sal_Int32 y2(maPos.getY()+maSize.getY());
            if(r.hLineIntersect(x1,x2,y1)) return true;
            if(r.hLineIntersect(x1,x2,y2)) return true;
            if(r.vLineIntersect(x1,y1,y2)) return true;
            if(r.vLineIntersect(x2,y1,y2)) return true;
            return false;
        }

        bool inside( const SurfaceRect& r ) const
        {
            const sal_Int32 x1(maPos.getX());
            const sal_Int32 y1(maPos.getY());
            const sal_Int32 x2(maPos.getX()+maSize.getX());
            const sal_Int32 y2(maPos.getY()+maSize.getY());
            if(!(r.pointInside(x1,y1))) return false;
            if(!(r.pointInside(x2,y1))) return false;
            if(!(r.pointInside(x2,y2))) return false;
            if(!(r.pointInside(x1,y2))) return false;
            return true;
        }
    };
}

#endif