transformlib.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant 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.

 GtkRadiant 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 GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined (INCLUDED_TRANSFORMLIB_H)
#define INCLUDED_TRANSFORMLIB_H

#include "generic/constant.h"
#include "math/matrix.h"
#include "math/quaternion.h"

class TransformNode
{
    public:
        STRING_CONSTANT(Name, "TransformNode");
        virtual ~TransformNode ()
        {
        }
        virtual const Matrix4& localToParent () const = 0;
};

class IdentityTransform: public TransformNode
{
    public:
        const Matrix4& localToParent () const
        {
            return g_matrix4_identity;
        }
};

class MatrixTransform: public TransformNode
{
        Matrix4 m_localToParent;
    public:
        MatrixTransform () :
            m_localToParent(g_matrix4_identity)
        {
        }

        Matrix4& localToParent ()
        {
            return m_localToParent;
        }
        const Matrix4& localToParent () const
        {
            return m_localToParent;
        }
};

#include "generic/callback.h"

typedef Vector3 Translation;
typedef Quaternion Rotation;
typedef Vector3 Scale;

inline Matrix4 matrix4_transform_for_components (const Translation& translation, const Rotation& rotation,
        const Scale& scale)
{
    Matrix4 result(matrix4_rotation_for_quaternion_quantised(rotation));
    result.x().getVector3() *= scale.x();
    result.y().getVector3() *= scale.y();
    result.z().getVector3() *= scale.z();
    result.tx() = translation.x();
    result.ty() = translation.y();
    result.tz() = translation.z();
    return result;
}

typedef bool TransformModifierType;
const TransformModifierType TRANSFORM_PRIMITIVE = false;
const TransformModifierType TRANSFORM_COMPONENT = true;

class Transformable
{
    public:
        STRING_CONSTANT(Name, "Transformable");

        virtual ~Transformable ()
        {
        }

        virtual void setType (TransformModifierType type) = 0;
        virtual void setTranslation (const Translation& value) = 0;
        virtual void setRotation (const Rotation& value) = 0;
        virtual void setScale (const Scale& value) = 0;
        virtual void freezeTransform () = 0;
};

const Translation c_translation_identity = Translation(0, 0, 0);
const Rotation c_rotation_identity = c_quaternion_identity;
const Scale c_scale_identity = Scale(1, 1, 1);

class TransformModifier: public Transformable
{
        Translation m_translation;
        Rotation m_rotation;
        Scale m_scale;
        Callback m_changed;
        Callback m_apply;
        TransformModifierType m_type;
    public:

        TransformModifier (const Callback& changed, const Callback& apply) :
            m_translation(c_translation_identity), m_rotation(c_quaternion_identity), m_scale(c_scale_identity),
                    m_changed(changed), m_apply(apply), m_type(TRANSFORM_PRIMITIVE)
        {
        }
        void setType (TransformModifierType type)
        {
            m_type = type;
        }
        TransformModifierType getType () const
        {
            return m_type;
        }
        void setTranslation (const Translation& value)
        {
            m_translation = value;
            m_changed();
        }
        void setRotation (const Rotation& value)
        {
            m_rotation = value;
            m_changed();
        }
        void setScale (const Scale& value)
        {
            m_scale = value;
            m_changed();
        }
        void freezeTransform ()
        {
            if (m_translation != c_translation_identity || m_rotation != c_rotation_identity || m_scale
                    != c_scale_identity) {
                m_apply();
                m_translation = c_translation_identity;
                m_rotation = c_rotation_identity;
                m_scale = c_scale_identity;
                m_changed();
            }
        }
        const Translation& getTranslation () const
        {
            return m_translation;
        }
        const Rotation& getRotation () const
        {
            return m_rotation;
        }
        const Scale& getScale () const
        {
            return m_scale;
        }
        Matrix4 calculateTransform () const
        {
            return matrix4_transform_for_components(getTranslation(), getRotation(), getScale());
        }
};

#endif