project_files/HedgewarsMobile/Classes/CGPointUtils.c
author koda
Tue, 23 Aug 2011 03:46:17 +0200
changeset 5662 99083392cd4f
parent 4976 088d40d8aba2
child 6832 fae8fd118da9
permissions -rw-r--r--
FREE AT LAST!!! SDL came around a (mostly) sane way for implementing rotation events, so we can scrap all the workaround code that has been added to workaround it!! Also this allows us to use proper (internal) multitasking handling and can simplify optional settings and other yet unexplored features. Yay!
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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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 * File created on 03/10/2010.
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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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}