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/*
* The Mana Server
* Copyright (C) 2004-2010 The Mana World Development Team
*
* This file is part of The Mana Server.
*
* The Mana Server 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 Server 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 Server. If not, see <http://www.gnu.org/licenses/>.
*/
#include "game-server/collisiondetection.h"
#include <cmath>
#include "utils/mathutils.h"
#include "utils/point.h"
#define D_TO_R 0.0174532925 // PI / 180
#define R_TO_D 57.2957795 // 180 / PI
// Tests to see if pos is between s1 degree and s2
#define test_degrees(pos,s1,s2) (pos > s1 && pos < s2) || (s1 > s2 && !(pos < s1 && pos > s2))
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 invDist = utils::math::fastInvSqrt(distX * distX + distY * distY);
float dist = 1.0f / invDist;
// 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 * invDist);
} else {
if (distY < 0)
{
targetAngle = M_PI - asin(-distY * invDist);
} else {
targetAngle = -M_PI - asin(-distY * invDist);
}
}
// 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 * invDist) * 2;
return (targetDiff < secSize * 0.5f);
}
bool Collision::diskWithCircleSector(const Point &diskCenter, int diskRadius,
const Point §orCenter, int sectorRadius,
int halfTopAngle, int placeAngle)
{
float r1 = sectorRadius,
r2 = diskRadius;
float dx = sectorCenter.x - diskCenter.x,
dy = sectorCenter.y - diskCenter.y;
// d^2 = dx^2 + dy^2
float d = ((dx * dx) + (dy * dy));
// d^2 < r2^2
if (d < r2 * r2)
return true; // We are right on top of each other
// d^2 > r1^2 + r2^2
if (d > ((r1+r2) * (r1+r2)))
return false; // The two circles do not touch
float s1 = placeAngle - halfTopAngle,
s2 = placeAngle + halfTopAngle;
if (s1 >= 360)
s1 -= 360;
if (s1 < 0)
s1 += 360;
if (s2 >= 360)
s2 -= 360;
if (s2 < 0)
s2 += 360;
// Is the center point of circle 2 within circle 1?
if (d < r1 * r1)
{
// Circle 2 degrees in respect to circle 1
float c2dc1 = atan2(dy,dx) * R_TO_D;
if (c2dc1 < 0)
c2dc1 += 360;
if (test_degrees(c2dc1, s1, s2))
return true;
// Since we are well within range, we might be
// Too close, so we need to make sure two circles intersect
d = sqrt(d);
r1 = d;
} else {
d = sqrt(d);
}
float a = ((r1*r1) - (r2*r2) + (d*d)) / (2.0 * d);
float axd = (a * dx) / d,
ayd = (a * dy) / d,
h = sqrt((r1*r1) - (a*a));
float ix1 = axd + ((h * dx) / d),
iy1 = ayd - ((h * dy) / d),
ix2 = axd - ((h * dx) / d),
iy2 = ayd + ((h * dy) / d);
float idc1 = atan2(iy1,ix1) * R_TO_D;
if (idc1 < 0)
idc1 += 360;
if (test_degrees(idc1, s1, s2))
return true;
idc1 = atan2(iy2,ix2) * R_TO_D;
if (idc1 < 0)
idc1 += 360;
if (test_degrees(idc1, s1, s2))
return true;
// If we got to this point, it must be false
return false;
}
bool Collision::circleWithCircle(const Point ¢er1, int radius1,
const Point ¢er2, int radius2)
{
const int touchDistance = radius1 + radius2;
const int distX = center1.x - center2.x;
const int distY = center1.y - center2.y;
const int distSquared = distX * distX + distY * distY;
return distSquared < touchDistance * touchDistance;
}
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