p_bezier.cpp

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/*
 * p_bezier.cpp
 *
 * Copyright (C) 2007,2009  Thomas A. Vaughan
 * All rights reserved.
 *
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the <organization> nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THOMAS A. VAUGHAN ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THOMAS A. VAUGHAN BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 * Implementation of a bezier primitive.
 * (p_ stands for Primitive)
 */

// includes --------------------------------------------------------------------
#include "vgfx.h"             // all primitives should include this header first
#include "drawer.h"

#include "common/wave_ex.h"
#include "perf/perf.h"
#include "util/parsing.h"

#include "bezier/bezier.h"


namespace vgfx {

////////////////////////////////////////////////////////////////////////////////
//
//      static helper methods
//
////////////////////////////////////////////////////////////////////////////////

class Bezier : public Primitive {
public:
        ~Bezier(void) throw() { }

        // public class methods ------------------------------------------------
        void initialize(IN const init_bezier_t& init);

        // vgfx::Primitive class interface methods -----------------------------
        virtual const char * getType(void) const throw() { return "bezier"; }
        virtual void persist(OUT std::ostream& stream) const;
        virtual bool doesContainerExist(IN const VecString& path) const;
        virtual bool canCreateContainer(IN const VecString& path) const;
        virtual void removeContainer(IN const VecString& path);
        virtual void getContainerDictionary(IN const VecString& path,
                                OUT dictionary_t& data) const;
        virtual void setContainerDictionary(IN const VecString& path,
                                IN const dictionary_t& data);
        virtual void recalcBoundingRect(IN const char * tag_path,
                                IN Drawer * drawer,
                                IN const xform_2d_t& T);
        virtual bool getBoundingRect(OUT rect_t& r) const throw();
        virtual void draw(IN Drawer * drawer,
                                IN const rect_t& r_cm,
                                IN const xform_2d_t& T);

private:
        bezier::curve_t m_curve;
        rect_t          m_bounding;
};



////////////////////////////////////////////////////////////////////////////////
//
//      Bezier -- public class methods
//
////////////////////////////////////////////////////////////////////////////////

void
Bezier::initialize
(
IN const init_bezier_t& init
)
{
        this->setID(init.id.c_str());
        m_curve = init.curve;
}



void
Bezier::recalcBoundingRect
(
IN const char * path,
IN Drawer * drawer,
IN const xform_2d_t& T
)
{
        perf::Timer timer("Bezier::recalcBoundingRect");
        //ASSERT(drawer, "null");
        bezier::getRect(m_curve, m_bounding);
        m_bounding.expand(0.05);        // pen width etc
}



bool
Bezier::getBoundingRect
(
OUT rect_t& r
)
const throw()
{
        r = m_bounding;
        return true;
}



#define WRITE_B_FIELD(q) { if (m_curve.q) { stream << " " << #q << " " << m_curve.q; } }

void
Bezier::persist
(
OUT std::ostream& stream
)
const
{
        stream << "bezier id " << this->getID();
        WRITE_B_FIELD(x0)
        WRITE_B_FIELD(ax)
        WRITE_B_FIELD(bx)
        WRITE_B_FIELD(cx)
        WRITE_B_FIELD(y0)
        WRITE_B_FIELD(ay)
        WRITE_B_FIELD(by)
        WRITE_B_FIELD(cy)
}



bool
Bezier::doesContainerExist
(
IN const VecString& path
)
const
{
        if (path.size() > 0) {
                return false;
        }
        return true;
}


bool
Bezier::canCreateContainer
(
IN const VecString& path
)
const
{
        return false;
}


void
Bezier::removeContainer
(
IN const VecString& path
)
{
        WAVE_EX(wex);
        wex << "bezier curves have no removable containers";
}



#define ADD_B_VALUE(q) { data[ #q ] = getStringValue( m_curve.q ); }

void
Bezier::getContainerDictionary
(
IN const VecString& path,
OUT dictionary_t& data
)
const
{
        if (path.size() > 0) {
                WAVE_EX(wex);
                wex << "Bezier curves do not support subcontainers";
        }

        data.clear();
        ADD_B_VALUE(x0)
        ADD_B_VALUE(ax)
        ADD_B_VALUE(bx)
        ADD_B_VALUE(cx)
        ADD_B_VALUE(y0)
        ADD_B_VALUE(ay)
        ADD_B_VALUE(by)
        ADD_B_VALUE(cy)
}



#define CHECK_B_VALUE(q) { if (!strcmp(name, #q )) { m_curve.q = atof(value); continue; } }

void
Bezier::setContainerDictionary
(
IN const VecString& path,
IN const dictionary_t& data
)
{
        if (path.size() > 0) {
                WAVE_EX(wex);
                wex << "Bezier curves do not support subcontainers";
        }

        for (dictionary_t::const_iterator i = data.begin(); i != data.end();
             ++i) {
                const char * name = i->first.c_str();
                const char * value = i->second.c_str();

                CHECK_B_VALUE(x0)
                CHECK_B_VALUE(ax)
                CHECK_B_VALUE(bx)
                CHECK_B_VALUE(cx)
                CHECK_B_VALUE(y0)
                CHECK_B_VALUE(ay)
                CHECK_B_VALUE(by)
                CHECK_B_VALUE(cy)

                {
                        WAVE_EX(wex);
                        wex << "Invalid property for bezier curve: '";
                        wex << name << "'";
                }
        }
}



void
Bezier::draw
(
IN Drawer * drawer,
IN const rect_t& r_cm,
IN const xform_2d_t& T
)
{
        ASSERT(drawer, "null drawer");
        drawer->setTransform(T);
        drawer->drawBezier(m_curve);
}



////////////////////////////////////////////////////////////////////////////////
//
//      public API
//
////////////////////////////////////////////////////////////////////////////////

#define SET_B_FIELD(x)   init.curve.x = atof(getOptionalValue(data, #x , "0.0"));

void
init_bezier_from_data
(
IN const dictionary_t& data,
OUT init_bezier_t& init
)
{
        init.id = getRequiredValue(data, "id");

        SET_B_FIELD(x0)
        SET_B_FIELD(ax)
        SET_B_FIELD(bx)
        SET_B_FIELD(cx)
        SET_B_FIELD(y0)
        SET_B_FIELD(ay)
        SET_B_FIELD(by)
        SET_B_FIELD(cy)
}



smart_ptr<Primitive>
create_bezier
(
IN const init_bezier_t& init
)
{
        smart_ptr<Bezier> local = new Bezier;
        ASSERT(local, "out of memory");

        local->initialize(init);

        return local;
}


};      // vgfx namespace