project_files/HedgewarsMobile/Classes/CGPointUtils.c
author koda
Fri, 05 Apr 2013 22:40:44 +0200
changeset 8868 6f79a69a41f1
parent 6832 fae8fd118da9
child 10108 c68cf030eded
permissions -rw-r--r--
little feedback rewording
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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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#include "CGPointUtils.h"
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#include "math.h"
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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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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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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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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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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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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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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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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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}