80 lines
2.8 KiB
C++

/*
** Command & Conquer Generals(tm)
** Copyright 2025 Electronic Arts Inc.
**
** 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/>.
*/
////////////////////////////////////////////////////////////////////////////////
// //
// (c) 2001-2003 Electronic Arts Inc. //
// //
////////////////////////////////////////////////////////////////////////////////
// DiscreteCircle.h ///////////////////////////////////////////////////////////////////////////////
// John K McDonald, Jr.
// September 2002
// DO NOT DISTRIBUTE
#pragma once
#ifndef __DISCRETECIRCLE_H__
#define __DISCRETECIRCLE_H__
//-------------------------------------------------------------------------------------------------
/**
One horizontal line of the circle we are going to generate, the points drawn should be from
(xStart, yPos)-(xEnd, yPos), inclusive.
*/
struct HorzLine
{
Int yPos;
Int xStart;
Int xEnd;
};
// Vector and Iterators for the HorzLine struct.
typedef std::vector<HorzLine> VecHorzLine;
typedef VecHorzLine::iterator VecHorzLineIt;
//-------------------------------------------------------------------------------------------------
// Useful if you'd like to not have to deal with the logic of drawing the circle.
typedef void (*ScanlineDrawFunc)(Int xStart, Int xEnd, Int yPos, void *otherParms);
/**
DiscreteCircle generates a circle centered at xCenter, yCenter, including radius. It generates
horizontal segments for the top half of the circle only, so they need to be duplicated for the
bottom half.
*/
class DiscreteCircle
{
VecHorzLine m_edges; // Should be HorzLines
Int m_yPos; // Used to know when to draw the bottom scanline
Int m_yPosDoubled; // Used to draw the bottom half of the circle.
public:
DiscreteCircle(Int xCenter, Int yCenter, Int radius);
__inline const VecHorzLine &getEdges(void) const { return m_edges; }
__inline Int getEdgeCount(void) const { return m_edges.size(); }
void drawCircle(ScanlineDrawFunc functionToDrawWith, void *parmToPass);
protected:
void generateEdgePairs(Int xCenter, Int yCenter, Int radius);
void removeDuplicates();
};
#endif /* __DISCRETECIRCLE_H__ */