SFMLDebugDraw.h

// Debug draw for Box2D 2.2.1 - 2.3.0 for SFML 2.0 - SFMLDebugDraw.h
// Copyright (C) 2013  Matija Lovrekovic
//
// 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 SFMLDEBUGDRAW_H
#define SFMLDEBUGDRAW_H

#include <Box2D/Box2D.h>
#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>
#include <cmath>

namespace sfdd {
const float SCALE = 32.f;
}

class SFMLDebugDraw : public b2Draw {
private:
  sf::RenderWindow *m_window;

public:
  SFMLDebugDraw(sf::RenderWindow &window);

  /// Convert Box2D's OpenGL style color definition[0-1] to SFML's color
  /// definition[0-255], with optional alpha byte[Default - opaque]
  static sf::Color GLColorToSFML(const b2Color &color, sf::Uint8 alpha = 255) {
    return sf::Color(static_cast<sf::Uint8>(color.r * 255),
                     static_cast<sf::Uint8>(color.g * 255),
                     static_cast<sf::Uint8>(color.b * 255), alpha);
  }

  /// Convert Box2D's vector to SFML vector [Default - scales the vector up by
  /// SCALE constants amount]
  static sf::Vector2f B2VecToSFVec(const b2Vec2 &vector,
                                   bool scaleToPixels = true) {
    return sf::Vector2f(vector.x * (scaleToPixels ? sfdd::SCALE : 1.f),
                        vector.y * (scaleToPixels ? sfdd::SCALE : 1.f));
  }

  /// Draw a closed polygon provided in CCW order.
  void DrawPolygon(const b2Vec2 *vertices, int32 vertexCount,
                   const b2Color &color);

  /// Draw a solid closed polygon provided in CCW order.
  void DrawSolidPolygon(const b2Vec2 *vertices, int32 vertexCount,
                        const b2Color &color);

  /// Draw a circle.
  void DrawCircle(const b2Vec2 &center, float32 radius, const b2Color &color);

  /// Draw a solid circle.
  void DrawSolidCircle(const b2Vec2 &center, float32 radius, const b2Vec2 &axis,
                       const b2Color &color);

  /// Draw a line segment.
  void DrawSegment(const b2Vec2 &p1, const b2Vec2 &p2, const b2Color &color);

  /// Draw a transform. Choose your own length scale.
  void DrawTransform(const b2Transform &xf);
};
#endif // SFMLDEBUGDRAW_H