layout_2d.cpp

Go to the documentation of this file.

/*
 * layout_2d.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.
 *
 *
 * 2D layout implementation.  See layout.h
 */

// includes --------------------------------------------------------------------
#include "layout_2d.h"          // always include our own header first!


namespace layout {

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

static void
horizontalLayout
(
IN const layout_info_t& info,
IO vec_obj_t& objects
)
{
        ASSERT(eLayout_Horizontal == info.type,
            "Layout type mismatch");
        ASSERT(objects.size() > 0, "empty array?");

        // loop through and get the max height
        float max = 0.0;
        for (vec_obj_t::iterator i = objects.begin(); i != objects.end(); ++i) {
                object_t& obj = *i;

                if (obj.height > max) {
                        max = obj.height;
                }
        }

        // now have a y-center
        float ycenter = 0.5 * max;      // all objects should center here

        // run through all objects, and set x-coordinate and y-coordinate
        float x = 0;
        for (vec_obj_t::iterator i = objects.begin(); i != objects.end(); ++i) {
                object_t& obj = *i;

                // xvalue is easy
                obj.x = x;
                x += obj.width + info.spacing;

                // center yvalue
                obj.y = ycenter - 0.5 * obj.height;
        }
}



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

void
performLayout
(
IN const layout_info_t& info,
IO vec_obj_t& objects
)
{
        ASSERT(objects.size() > 0, "empty array?");

        if (eLayout_Horizontal == info.type) {
                horizontalLayout(info, objects);
        } else {
                ASSERT(false, "Only support horizontal layout for now");
        }
}



};      // layout namespace