~centralelyon2010/inkscape/imagelinks2

#ifndef SEEN_SP_GRADIENT_H

#define SEEN_SP_GRADIENT_H

/** \file

 * SVG <stop> <linearGradient> and <radialGradient> implementation

 *

 * Authors:

 *   Lauris Kaplinski <lauris@kaplinski.com>

 *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>

 *   Jon A. Cruz <jon@joncruz.org>

 *

 * Copyrigt  (C) 2010 Jon A. Cruz

 * Copyright (C) 2007 Johan Engelen

 * Copyright (C) 1999-2002 Lauris Kaplinski

 * Copyright (C) 2000-2001 Ximian, Inc.

 *

 * Released under GNU GPL, read the file 'COPYING' for more information

 */

#include <gdk/gdk.h>

#include <glibmm/ustring.h>

#include <2geom/affine.h>

#include "sp-paint-server.h"

#include "sp-gradient-spread.h"

#include "sp-gradient-units.h"

#include "sp-gradient-vector.h"

#include <stddef.h>

#include <sigc++/connection.h>

struct SPGradientReference;

#define SP_TYPE_GRADIENT (SPGradient::getType())

#define SP_GRADIENT(obj) (G_TYPE_CHECK_INSTANCE_CAST((obj), SP_TYPE_GRADIENT, SPGradient))

#define SP_GRADIENT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST((klass), SP_TYPE_GRADIENT, SPGradientClass))

#define SP_IS_GRADIENT(obj) (G_TYPE_CHECK_INSTANCE_TYPE((obj), SP_TYPE_GRADIENT))

#define SP_IS_GRADIENT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE((klass), SP_TYPE_GRADIENT))

typedef enum {

    SP_GRADIENT_TYPE_UNKNOWN,

    SP_GRADIENT_TYPE_LINEAR,

    SP_GRADIENT_TYPE_RADIAL

} SPGradientType;

typedef enum {

    SP_GRADIENT_STATE_UNKNOWN,

    SP_GRADIENT_STATE_VECTOR,

    SP_GRADIENT_STATE_PRIVATE

} SPGradientState;

typedef enum {

    POINT_LG_BEGIN =0, //start enum at 0 (for indexing into gr_knot_shapes array for example)

    POINT_LG_END,

    POINT_LG_MID,

    POINT_RG_CENTER,

    POINT_RG_R1,

    POINT_RG_R2,

    POINT_RG_FOCUS,

    POINT_RG_MID1,

    POINT_RG_MID2,

    // insert new point types here.

    POINT_G_INVALID

} GrPointType;

/**

 * Gradient

 *

 * Implement spread, stops list

 * \todo fixme: Implement more here (Lauris)

 */

struct SPGradient : public SPPaintServer {

    /** Reference (href) */

    SPGradientReference *ref;

    /** State in Inkscape gradient system */

    guint state : 2;

private:

    /** gradientUnits attribute */

    SPGradientUnits units;

    guint units_set : 1;

public:

    /** gradientTransform attribute */

    Geom::Affine gradientTransform;

    guint gradientTransform_set : 1;

private:

    /** spreadMethod attribute */

    SPGradientSpread spread;

    guint spread_set : 1;

    /** Gradient stops */

    guint has_stops : 1;

public:

    /** Composed vector */

    SPGradientVector vector;

    sigc::connection modified_connection;

    bool hasStops() const;

    SPStop* getFirstStop();

    int getStopCount() const;

    bool isUnitsSet() const;

    SPGradientUnits getUnits() const;

    void setUnits(SPGradientUnits units);

    bool isSpreadSet() const;

    SPGradientSpread getSpread() const;

/**

 * Returns private vector of given gradient (the gradient at the end of the href chain which has

 * stops), optionally normalizing it.

 *

 * \pre SP_IS_GRADIENT(gradient).

 * \pre There exists a gradient in the chain that has stops.

 */

    SPGradient *getVector(bool force_private = false);

    static GType getType();

    /** Forces vector to be built, if not present (i.e. changed) */

    void ensureVector();

    /** Ensures that color array is populated */

    void ensureColors();

    /**

     * Set spread property of gradient and emit modified.

     */

    void setSpread(SPGradientSpread spread);

    SPGradientSpread fetchSpread();

    SPGradientUnits fetchUnits();

    void setSwatch(bool swatch = true);

private:

    bool invalidateVector();

    void rebuildVector();

    friend class SPGradientImpl;

    friend class SPLGPainter;

    friend class SPRGPainter;

};

/**

 * The SPGradient vtable.

 */

struct SPGradientClass {

    SPPaintServerClass parent_class;

};

#include "sp-gradient-fns.h"

#endif // SEEN_SP_GRADIENT_H

/*

  Local Variables:

  mode:c++

  c-file-style:"stroustrup"

  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))

  indent-tabs-mode:nil

  fill-column:99

  End:

*/

// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :