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/*
This file is part of Kig, a KDE program for Interactive Geometry...
Copyright (C) 2002 Dominique Devriese <devriese@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
USA
*/
#ifndef KIG_MISC_COORDINATE_SYSTEM_H
#define KIG_MISC_COORDINATE_SYSTEM_H
#include <qnamespace.h>
class KigPainter;
class KigDocument;
class KigWidget;
class CoordinateSystem;
class QValidator;
class Coordinate;
class QString;
class QStringList;
class QWidget;
/**
* a factory to build a CoordinateSystem and a small handle to the
* existant CoordinateSystem's...
*/
class CoordinateSystemFactory
{
public:
enum { Euclidean = 0, Polar = 1 };
static QStringList names();
static QString setCoordinateSystemStatement( int id );
static CoordinateSystem* build( int which );
static CoordinateSystem* build( const char* type );
};
/**
* a CoordinateSystem is what the user sees: it is kept by KigPart to
* show the user a grid, and to show the coordinates of points... it
* allows for weird CoordinateSystem's like homogeneous or
* projective...
* internally, it does nothing, it could almost have been an ordinary
* Object..., mapping coordinates from and to the screen to and from
* the internal coordinates is done elsewhere ( KigPainter and
* KigWidget... )
*/
class CoordinateSystem
: public Qt
{
public:
CoordinateSystem();
virtual ~CoordinateSystem();
virtual QString fromScreen ( const Coordinate& pt, const KigDocument& w ) const = 0;
/**
* This returns a notice to say in which format coordinates should
* be entered. This should be something like:
* i18n( "Enter coordinates in the following form: \"(x,y)\", where
* x is the x coordinate, and y is the y coordinate." );
*/
virtual QString coordinateFormatNotice() const = 0;
/**
* Like \ref coordinateFormatNotice(), but with HTML tags useful to
* have a rich text...
*/
virtual QString coordinateFormatNoticeMarkup() const = 0;
virtual Coordinate toScreen (const QString& pt, bool& ok) const = 0;
virtual void drawGrid ( KigPainter& p, bool showgrid = true,
bool showaxes = true ) const = 0;
virtual QValidator* coordinateValidator() const = 0;
virtual Coordinate snapToGrid( const Coordinate& c,
const KigWidget& w ) const = 0;
virtual const char* type() const = 0;
virtual int id() const = 0;
};
class EuclideanCoords
: public CoordinateSystem
{
public:
EuclideanCoords();
~EuclideanCoords();
QString fromScreen( const Coordinate& pt, const KigDocument& w ) const;
QString coordinateFormatNotice() const;
QString coordinateFormatNoticeMarkup() const;
Coordinate toScreen (const QString& pt, bool& ok) const;
void drawGrid ( KigPainter& p, bool showgrid = true,
bool showaxes = true ) const;
QValidator* coordinateValidator() const;
Coordinate snapToGrid( const Coordinate& c,
const KigWidget& w ) const;
const char* type() const;
int id() const;
};
class PolarCoords
: public CoordinateSystem
{
void drawGridLine( KigPainter& p, const Coordinate& center,
double radius ) const;
public:
PolarCoords();
~PolarCoords();
QString fromScreen( const Coordinate& pt, const KigDocument& w ) const;
QString coordinateFormatNotice() const;
QString coordinateFormatNoticeMarkup() const;
Coordinate toScreen (const QString& pt, bool& ok) const;
void drawGrid ( KigPainter& p, bool showgrid = true,
bool showaxes = true ) const;
QValidator* coordinateValidator() const;
Coordinate snapToGrid( const Coordinate& c,
const KigWidget& w ) const;
const char* type() const;
int id() const;
};
#endif
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