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/*
* The Mana World Server
* Copyright 2004 The Mana World Development Team
*
* This file is part of The Mana World.
*
* The Mana World 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 2 of the License, or any later version.
*
* The Mana World 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 The Mana World; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: being.cpp 3010 2007-01-05 20:12:51Z gmelquio $
*/
#include "collisiondetection.hpp"
#include "point.h"
#include <cmath>
bool
Collision::circleWithCirclesector( const Point& circlePos, int circleRadius,
const Point& secPos, int secRadius, float secAngle, float secSize)
{
float targetAngle;
//calculate distance
int distX = circlePos.x - secPos.x;
int distY = circlePos.y - secPos.y;
float dist = sqrt(distX * distX + distY * distY);
//if out of range we can't hit it
if (dist > secRadius + circleRadius) {
return false;
}
//if we are standing in it we hit it in any case
if (dist < circleRadius) {
return true;
}
//calculate target angle
if (distX > 0)
{
targetAngle = asin(-distY / dist);
} else {
if (distY < 0)
{
targetAngle = M_PI - asin(-distY / dist);
} else {
targetAngle = -M_PI - asin(-distY / dist);
}
}
//calculate difference from segment angle
float targetDiff = fabs(targetAngle - secAngle);
if (targetDiff > M_PI)
{
targetDiff = fabs(targetDiff - M_PI * 2);
}
//Add hit circle
secSize += asin(circleRadius/dist) * 2;
return (targetDiff < secSize / 2.0f);
}
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