transform_tools.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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/>.
 *
 */

#ifndef GRAPHICS_TRANSFORM_TOOLS_H
#define GRAPHICS_TRANSFORM_TOOLS_H

#include "common/rect.h"
#include "graphics/transform_struct.h"

namespace Graphics {

    static const float kEpsilon = 0.00001f;  // arbitrarily taken number

    struct FloatPoint {
        float x;
        float y;
        FloatPoint() : x(0), y(0) {}
        FloatPoint(float x1, float y1) : x(x1), y(y1) {}
        FloatPoint(const Common::Point p) : x(p.x), y(p.y) {}
        bool operator==(const FloatPoint &p) const { return fabs(x - p.x) < kEpsilon && fabs(y - p.y) < kEpsilon; }
        bool operator!=(const FloatPoint  &p) const { return fabs(x - p.x) > kEpsilon || fabs(y - p.y) > kEpsilon; }
        FloatPoint operator+(const FloatPoint &delta) const { return FloatPoint (x + delta.x, y + delta.y);     }
        FloatPoint operator-(const FloatPoint &delta) const { return FloatPoint (x - delta.x, y - delta.y);     }

        FloatPoint& operator+=(const FloatPoint &delta) {
            x += delta.x;
            y += delta.y;
            return *this;
        }
        FloatPoint& operator-=(const FloatPoint &delta) {
            x -= delta.x;
            y -= delta.y;
            return *this;
        }
    };

class TransformTools {
public:
    static FloatPoint transformPoint(FloatPoint point, const float rotate, const Common::Point &zoom, const bool mirrorX = false, const bool mirrorY = false);

    static Common::Rect newRect(const Common::Rect &oldRect, const TransformStruct &transform, Common::Point *newHotspot);
};

} // End of namespace Wintermute
#endif