frontlib: Add/change comments to correspond to recent changes in QtFrontend and server
/*
* Hedgewars-iOS, a Hedgewars port for iOS devices
* Copyright (c) 2009-2011 Vittorio Giovara <vittorio.giovara@gmail.com>
*
* 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; version 2 of the License
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "CGPointUtils.h"
#include "math.h"
CGFloat distanceBetweenPoints (CGPoint first, CGPoint second) {
CGFloat deltaX = second.x - first.x;
CGFloat deltaY = second.y - first.y;
return sqrt(deltaX*deltaX + deltaY*deltaY );
}
CGFloat angleBetweenPoints(CGPoint first, CGPoint second) {
CGFloat height = second.y - first.y;
CGFloat width = first.x - second.x;
CGFloat rads = atan(height/width);
return radiansToDegrees(rads);
}
CGFloat angleBetweenLines(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPoint line2End) {
CGFloat a = line1End.x - line1Start.x;
CGFloat b = line1End.y - line1Start.y;
CGFloat c = line2End.x - line2Start.x;
CGFloat d = line2End.y - line2Start.y;
CGFloat rads = acos(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d))));
return radiansToDegrees(rads);
}
CGFloat CGPointDot(CGPoint a,CGPoint b) {
return a.x*b.x+a.y*b.y;
}
CGFloat CGPointLen(CGPoint a) {
return sqrtf(a.x*a.x+a.y*a.y);
}
CGPoint CGPointSub(CGPoint a,CGPoint b) {
CGPoint c = {a.x-b.x,a.y-b.y};
return c;
}
CGFloat CGPointDist(CGPoint a,CGPoint b) {
CGPoint c = CGPointSub(a,b);
return CGPointLen(c);
}
CGPoint CGPointNorm(CGPoint a) {
CGFloat m = sqrtf(a.x*a.x+a.y*a.y);
CGPoint c;
c.x = a.x/m;
c.y = a.y/m;
return c;
}