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/*
** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Harry Storbacka
** Magnus Norddahl
** (if your name is missing here, please add it)
*/
//! clanDisplay="Collision"
//! header=display.h
#ifndef header_outline_circle
#define header_outline_circle
#if _MSC_VER > 1000
#pragma once
#endif
#include "../../Core/Math/point.h"
#include <cmath>
//: Collision detection outline segmentation circle.
//- !group=Display/Collision !
//- !header=display.h!
//- <p>Outline circles split the line segments into groups for faster collision detection.
//- If two circles encapsulating the lines don't collide, none of the lines inside them can
//- collide either. </p>
class CL_OutlineCircle
{
//! Construction:
public:
//: Construct a outline circle
CL_OutlineCircle() :
position(-1.0f,-1.0f),
radius(0),
start(0),
end(0)
{
return;
}
//! Operations:
public:
//: Construct a outline circle
//param CL_OutlineCircle &other : Other circle to test.
bool collide(const CL_OutlineCircle &other) const
{
if( &other == this )
return false;
CL_Pointf pos = position - other.position;
float dist = (float) sqrt( pos.x*pos.x+pos.y*pos.y );
if( dist > (radius + other.radius) )
return false;
return true;
}
//! Attributes:
public:
CL_Pointf position;
float radius;
unsigned int start;
unsigned int end;
};
#endif
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