author | koda |
Thu, 22 Sep 2011 01:02:57 +0200 | |
changeset 5984 | 6fd40d866342 |
parent 4976 | 088d40d8aba2 |
child 6832 | fae8fd118da9 |
permissions | -rw-r--r-- |
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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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} |