author | nemo |
Sun, 31 Jan 2010 16:35:18 +0000 | |
changeset 2729 | c216de4d0c93 |
parent 2725 | 89908847b155 |
child 3385 | 361bd29293f4 |
permissions | -rw-r--r-- |
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/* |
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* CGPointUtils.c |
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* PinchMe |
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* |
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* Created by Jeff LaMarche on 8/2/08. |
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* Copyright 2008 __MyCompanyName__. All rights reserved. |
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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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#define degreesToRadian(x) (M_PI * x / 180.0) |
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#define radiansToDegrees(x) (180.0 * x / M_PI) |
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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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} |