p_line.cpp

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/*
 * p_line.cpp
 *
 * Copyright (C) 2007  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 line 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"



namespace vgfx {

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

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

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

        // vgfx::Primitive class interface methods -----------------------------
        virtual const char * getType(void) const throw() { return "line"; }
        virtual void persist(OUT std::ostream& stream) const;
        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:
        point_t         m_p0;   // starting point
        point_t         m_p1;   // ending point
};



////////////////////////////////////////////////////////////////////////////////
//
//      Line -- public class methods
//
////////////////////////////////////////////////////////////////////////////////

void
Line::initialize
(
IN const init_line_t& init
)
{
        this->setID(init.id.c_str());
        m_p0.set(init.x0, init.y0);
        m_p1.set(init.x1, init.y1);
}



bool
Line::getBoundingRect
(
OUT rect_t& r
)
const throw()
{
        r.left = (m_p0.x < m_p1.x) ? m_p0.x : m_p1.x;
        r.right =(m_p0.x > m_p1.x) ? m_p0.x : m_p1.x;

        r.top = (m_p0.y < m_p1.y) ? m_p0.y : m_p1.y;
        r.bottom = (m_p0.y > m_p1.y) ? m_p0.y : m_p1.y;

        r.expand(0.05); // pen width etc
        return true;
}



#define WRITE_L_FIELD(tag, q) { if (q) { stream << " " << #tag << " " << q; } }

void
Line::persist
(
OUT std::ostream& stream
)
const
{
        stream << "line id " << this->getID();
        WRITE_L_FIELD(x0, m_p0.x)
        WRITE_L_FIELD(y0, m_p0.y)
        WRITE_L_FIELD(x1, m_p1.x)
        WRITE_L_FIELD(y1, m_p1.y)
}



void
Line::draw
(
IN Drawer * drawer,
IN const rect_t& r_cm,
IN const xform_2d_t& T
)
{
        ASSERT(drawer, "null");

        drawer->setTransform(T);
        drawer->drawLine(m_p0, m_p1);
}



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

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

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

        SET_L_FIELD(x0)
        SET_L_FIELD(y0)
        SET_L_FIELD(x1)
        SET_L_FIELD(y1)
}



smart_ptr<Primitive>
create_line
(
IN const init_line_t& init
)
{
        smart_ptr<Line> local = new Line;
        ASSERT(local, "out of memory");

        local->initialize(init);

        return local;
}


};      // vgfx namespace