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/***********************************************************************
    filename:   CEGUICoordConverter.h
    created:    Sun Sep 18 2005
    author:     Paul D Turner <paul@cegui.org.uk>
*************************************************************************/
/***************************************************************************
 *   Copyright (C) 2004 - 2006 Paul D Turner & The CEGUI Development Team
 *
 *   Permission is hereby granted, free of charge, to any person obtaining
 *   a copy of this software and associated documentation files (the
 *   "Software"), to deal in the Software without restriction, including
 *   without limitation the rights to use, copy, modify, merge, publish,
 *   distribute, sublicense, and/or sell copies of the Software, and to
 *   permit persons to whom the Software is furnished to do so, subject to
 *   the following conditions:
 *
 *   The above copyright notice and this permission notice shall be
 *   included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *   IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 *   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 *   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 ***************************************************************************/
#ifndef _CEGUICoordConverter_h_
#define _CEGUICoordConverter_h_

#include "CEGUIUDim.h"

// Start of CEGUI namespace section
namespace CEGUI
{
/*!
\brief
    Utility class that helps in converting various types of co-ordinate between
    absolute screen positions and positions offset from the top-left corner of
    a given Window object.
*/
class CEGUIEXPORT CoordConverter
{
public:
    /*!
    \brief
        Convert a window co-ordinate value, specified as a UDim, to a screen
        relative pixel co-ordinate.

    \param window
        Window object to use as a base for the conversion.

    \param x
        UDim x co-ordinate value to be converted

    \return
        float value describing a pixel screen co-ordinate that is equivalent to
        window UDim co-ordinate \a x.
    */
    static float windowToScreenX(const Window& window, const UDim& x);

    /*!
    \brief
        Convert a window pixel co-ordinate value, specified as a float, to a
        screen pixel co-ordinate.

    \param window
        Window object to use as a base for the conversion.

    \param x
        float x co-ordinate value to be converted.

    \return
        float value describing a pixel screen co-ordinate that is equivalent to
        window co-ordinate \a x.
    */
    static float windowToScreenX(const Window& window, const float x);

    /*!
    \brief
        Convert a window co-ordinate value, specified as a UDim, to a screen
        relative pixel co-ordinate.

    \param window
        Window object to use as a base for the conversion.

    \param y
        UDim y co-ordinate value to be converted

    \return
        float value describing a screen co-ordinate that is equivalent to
        window UDim co-ordinate \a y.
    */
    static float windowToScreenY(const Window& window, const UDim& y);

    /*!
    \brief
        Convert a window pixel co-ordinate value, specified as a float, to a
        screen pixel co-ordinate.

    \param window
        Window object to use as a base for the conversion.

    \param y
        float y co-ordinate value to be converted.

    \return
        float value describing a screen co-ordinate that is equivalent to
        window co-ordinate \a y.
    */
    static float windowToScreenY(const Window& window, const float y);

    /*!
    \brief
        Convert a window co-ordinate point, specified as a UVector2, to a
        screen relative pixel co-ordinate point.

    \param window
        Window object to use as a base for the conversion.

    \param vec
        UVector2 object describing the point to be converted

    \return
        Vector2 object describing a screen co-ordinate position that is
        equivalent to window based UVector2 \a vec.
    */
    static Vector2 windowToScreen(const Window& window, const UVector2& vec);

    /*!
    \brief
        Convert a window pixel co-ordinate point, specified as a Vector2, to a
        screen pixel co-ordinate point.

    \param window
        Window object to use as a base for the conversion.

    \param vec
        Vector2 object describing the point to be converted.

    \return
        Vector2 object describing a screen co-ordinate position that is
        equivalent to window based Vector2 \a vec.
    */
    static Vector2 windowToScreen(const Window& window, const Vector2& vec);

    /*!
    \brief
        Convert a window area, specified as a URect, to a screen area.

    \param rect
        URect object describing the area to be converted

    \return
        Rect object describing a screen area that is equivalent to window
        area \a rect.
    */
    static Rect windowToScreen(const Window& window, const URect& rect);

    /*!
    \brief
        Convert a pixel window area, specified as a Rect, to a screen area.

    \param window
        Window object to use as a base for the conversion.

    \param rect
        Rect object describing the area to be converted.

    \return
        Rect object describing a screen area that is equivalent to window
        area \a rect.
    */
    static Rect windowToScreen(const Window& window, const Rect& rect);

    /*!
    \brief
        Convert a screen relative UDim co-ordinate value to a window co-ordinate
        value, specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param x
        UDim x co-ordinate value to be converted

    \return
        float value describing a window co-ordinate value that is equivalent to
        screen UDim co-ordinate \a x.
    */
    static float screenToWindowX(const Window& window, const UDim& x);

    /*!
    \brief
        Convert a screen pixel co-ordinate value to a window co-ordinate
        value, specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param x
        float x co-ordinate value to be converted.

    \return
        float value describing a window co-ordinate value that is equivalent to
        screen co-ordinate \a x.
    */
    static float screenToWindowX(const Window& window, const float x);

    /*!
    \brief
        Convert a screen relative UDim co-ordinate value to a window co-ordinate
        value, specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param y
        UDim y co-ordinate value to be converted

    \return
        float value describing a window co-ordinate value that is equivalent to
        screen UDim co-ordinate \a y.
    */
    static float screenToWindowY(const Window& window, const UDim& y);

    /*!
    \brief
        Convert a screen pixel co-ordinate value to a window co-ordinate
        value, specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param y
        UDim y co-ordinate value to be converted.

    \return
        float value describing a window co-ordinate value that is equivalent to
        screen co-ordinate \a y.
    */
    static float screenToWindowY(const Window& window, const float y);

    /*!
    \brief
        Convert a screen relative UVector2 point to a window co-ordinate point,
        specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param vec
        UVector2 object describing the point to be converted

    \return
        Vector2 object describing a window co-ordinate point that is equivalent
        to screen based UVector2 point \a vec.
    */
    static Vector2 screenToWindow(const Window& window, const UVector2& vec);

    /*!
    \brief
        Convert a screen Vector2 pixel point to a window co-ordinate point,
        specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param vec
        Vector2 object describing the point to be converted.

    \return
        Vector2 object describing a window co-ordinate point that is equivalent
        to screen based Vector2 point \a vec.
    */
    static Vector2 screenToWindow(const Window& window, const Vector2& vec);

    /*!
    \brief
        Convert a URect screen area to a window area, specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param rect
        URect object describing the area to be converted

    \return
        Rect object describing a window area that is equivalent to URect screen
        area \a rect.
    */
    static Rect screenToWindow(const Window& window, const URect& rect);

    /*!
    \brief
        Convert a Rect screen pixel area to a window area, specified in pixels.

    \param window
        Window object to use as a target for the conversion.

    \param rect
        Rect object describing the area to be converted.

    \return
        Rect object describing a window area that is equivalent to Rect screen
        area \a rect.
    */
    static Rect screenToWindow(const Window& window, const Rect& rect);

private:
    /*!
    \brief
        Return the base X co-ordinate of the given Window object.

    \param window
        Window object to return base position for.

    \return
        float value indicating the base on-screen pixel location of the window
        on the x axis (i.e. The screen co-ord of the window's left edge).
    */
    static float getBaseXValue(const Window& window);

    /*!
    \brief
        Return the base Y co-ordinate of the given Window object.

    \param window
        Window object to return base position for.

    \return
        float value indicating the base on-screen pixel location of the window
        on the y axis (i.e. The screen co-ord of the window's top edge).
    */
    static float getBaseYValue(const Window& window);

    /*!
    \brief
        Return the base position of the given Window object.

    \param window
        Window object to return base position for.

    \return
        Vector2 value indicating the base on-screen pixel location of the window
        object. (i.e. The screen co-ord of the window's top-left corner).
    */
    static Vector2 getBaseValue(const Window& window);
};

} // End of  CEGUI namespace section


#endif  // end of guard _CEGUICoordConverter_h_
CEGUICoordConverter.h
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