/*
 * maprenderer.cpp
 * Copyright 2011, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
 *
 * This file is part of Tiled.
 *
 * This program 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.
 *
 * This program 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
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "maprenderer.h"

#include <QVector2D>

using namespace Tiled;

/**
 * Converts a line running from \a start to \a end to a polygon which
 * extends 5 pixels from the line in all directions.
 */
QPolygonF MapRenderer::lineToPolygon(const QPointF &start, const QPointF &end)
{
    QPointF direction = QVector2D(end - start).normalized().toPointF();
    QPointF perpendicular(-direction.y(), direction.x());

    const qreal thickness = 5.0f; // 5 pixels on each side
    direction *= thickness;
    perpendicular *= thickness;

    QPolygonF polygon(4);
    polygon[0] = start + perpendicular - direction;
    polygon[1] = start - perpendicular - direction;
    polygon[2] = end - perpendicular + direction;
    polygon[3] = end + perpendicular + direction;
    return polygon;
}