supertux/src/object/pulsing_light.hpp

//  SuperTux - Pulsing Light
//  Copyright (C) 2006 Christoph Sommer <christoph.sommer@2006.expires.deltadevelopment.de>
//
//  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 HEADER_SUPERTUX_OBJECT_PULSING_LIGHT_HPP
#define HEADER_SUPERTUX_OBJECT_PULSING_LIGHT_HPP

#include "object/light.hpp"

/**
 * Light source that changes alpha value to give the impression of a pulsating light
 */
class PulsingLight final : public Light
{
public:
  PulsingLight(const Vector& center, float cycle_len = 5.0, float min_alpha = 0.0, float max_alpha = 1.0, const Color& color = Color(1.0, 1.0, 1.0, 1.0));
  ~PulsingLight() override;

  virtual void update(float dt_sec) override;
  virtual void draw(DrawingContext& context) override;

protected:
  float min_alpha; /**< minimum alpha */
  float max_alpha; /**< maximum alpha */
  float cycle_len; /**< length in seconds of one cycle */

  float t; /**< local time in seconds */
};

#endif

/* EOF */