92 lines
3.4 KiB
C++
92 lines
3.4 KiB
C++
//
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// SuperTuxKart - a fun racing game with go-kart
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// Copyright (C) 2009-2015 Joerg Henrichs
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 3
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#ifndef HEADER_CHECK_LINE_HPP
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#define HEADER_CHECK_LINE_HPP
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#include <IMeshSceneNode.h>
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#include <line2d.h>
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#include <vector2d.h>
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using namespace irr;
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#include "tracks/check_structure.hpp"
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class XMLNode;
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class CheckManager;
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/**
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* \brief Implements a simple checkline.
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* It's a finite line with 2 endpoints in 2d
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* and a minimum height (i.e. the minimum Y coordinate of the two points).
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* If a kart crosses the line (in the projection on the 2d plane) and has an
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* appropriate height, the checkline will be triggered. This allows for very
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* easy checking of checklines, and should be sufficient for most check
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* structure.
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*
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* \ingroup tracks
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*/
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class CheckLine : public CheckStructure
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{
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private:
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/** The line that is tested for being crossed. */
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core::line2df m_line;
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core::vector2df m_cross_point;
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/** The minimum height of the checkline. */
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float m_min_height;
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/** The actual (or estimated) left and right end points in 3d. This is
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* used by the cannon. If the xml file stores only the min_height, those
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* points are set from the 2d points and the min height. */
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Vec3 m_left_point, m_right_point;
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/** Stores the sign (i.e. side) of the previous line to save some
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* computations. True if the value is >=0, i.e. the point is on
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* or to the right of the line. */
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std::vector<bool> m_previous_sign;
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/** Used to display debug information about checklines. */
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scene::IMeshSceneNode *m_debug_node;
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/** How much a kart is allowed to be under the minimum height of a
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* quad and still considered to be able to cross it. */
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static const int m_under_min_height = 1;
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/** How much a kart is allowed to be over the minimum height of a
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* quad and still considered to be able to cross it. */
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static const int m_over_min_height = 4;
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public:
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CheckLine(const XMLNode &node, unsigned int index);
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virtual ~CheckLine();
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virtual bool isTriggered(const Vec3 &old_pos, const Vec3 &new_pos,
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unsigned int indx);
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virtual void reset(const Track &track);
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virtual void changeDebugColor(bool is_active);
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/** Returns the actual line data for this checkpoint. */
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const core::line2df &getLine2D() const {return m_line;}
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// ------------------------------------------------------------------------
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/** Returns the 2d point at which the line was crossed. Note that this
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* value is ONLY valid after isTriggered is called and inside of
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* trigger(). */
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const core::vector2df &getCrossPoint() const { return m_cross_point; }
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}; // CheckLine
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#endif
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