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−/*
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− * Hedgewars-iOS, a Hedgewars port for iOS devices
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− * Copyright (c) 2009-2011 Vittorio Giovara <vittorio.giovara@gmail.com>
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− *
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− * This program is free software; you can redistribute it and/or modify
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− * it under the terms of the GNU General Public License as published by
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− * the Free Software Foundation; version 2 of the License
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− *
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− * This program is distributed in the hope that it will be useful,
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− * but WITHOUT ANY WARRANTY; without even the implied warranty of
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− * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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− * GNU General Public License for more details.
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− *
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− * You should have received a copy of the GNU General Public License
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− * along with this program; if not, write to the Free Software
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− * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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− */
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−
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−
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−#include "CGPointUtils.h"
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−#include "math.h"
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−
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−
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−CGFloat distanceBetweenPoints (CGPoint first, CGPoint second) {
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−    CGFloat deltaX = second.x - first.x;
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−    CGFloat deltaY = second.y - first.y;
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−    return sqrt(deltaX*deltaX + deltaY*deltaY );
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−}
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−
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−CGFloat angleBetweenPoints(CGPoint first, CGPoint second) {
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−    CGFloat height = second.y - first.y;
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−    CGFloat width = first.x - second.x;
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−    CGFloat rads = atan(height/width);
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−    return radiansToDegrees(rads);
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−}
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−
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−CGFloat angleBetweenLines(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPoint line2End) {
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−    CGFloat a = line1End.x - line1Start.x;
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−    CGFloat b = line1End.y - line1Start.y;
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−    CGFloat c = line2End.x - line2Start.x;
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−    CGFloat d = line2End.y - line2Start.y;
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−    CGFloat rads = acos(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d))));
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−    return radiansToDegrees(rads);
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−}
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−
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−CGFloat CGPointDot(CGPoint a,CGPoint b) {
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−    return a.x*b.x+a.y*b.y;
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−}
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−
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−CGFloat CGPointLen(CGPoint a) {
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−    return sqrtf(a.x*a.x+a.y*a.y);
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−}
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−
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−CGPoint CGPointSub(CGPoint a,CGPoint b) {
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−    CGPoint c = {a.x-b.x,a.y-b.y};
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−    return c;
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−}
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−
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−CGFloat CGPointDist(CGPoint a,CGPoint b) {
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−    CGPoint c = CGPointSub(a,b);
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−    return CGPointLen(c);
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−}
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−
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−CGPoint CGPointNorm(CGPoint a) {
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−    CGFloat m = sqrtf(a.x*a.x+a.y*a.y);
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−    CGPoint c;
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−    c.x = a.x/m;
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−    c.y = a.y/m;
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−    return c;
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−}