cocoaTouch/otherSrc/CGPointUtils.c
author koda
Thu, 17 Jun 2010 19:57:51 +0200
changeset 3513 f589230fa21b
parent 3385 361bd29293f4
permissions -rw-r--r--
now it's possible to select the scheme file in the ifrontendfix a type about loading an image (iphone file system IS case senstive) add rotation for iphone build too make the ifrontend work again with 3.0 sdk reworked openalbridge following most of an old implementation by Smaxx and making it more modular -- now sources are limited but the memory extension and cleanup is todo nil'd many variables in engine that were causing intialization problems

/*
 *  CGPointUtils.c
 *  PinchMe
 *
 *  Created by Jeff LaMarche on 8/2/08.
 *  Copyright 2008 __MyCompanyName__. All rights reserved.
 *
 */

#include "CGPointUtils.h"
#include <math.h>


CGFloat distanceBetweenPoints (CGPoint first, CGPoint second) {
	CGFloat deltaX = second.x - first.x;
	CGFloat deltaY = second.y - first.y;
	return sqrt(deltaX*deltaX + deltaY*deltaY );
}

CGFloat angleBetweenPoints(CGPoint first, CGPoint second) {
	CGFloat height = second.y - first.y;
	CGFloat width = first.x - second.x;
	CGFloat rads = atan(height/width);
	return radiansToDegrees(rads);
}

CGFloat angleBetweenLines(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPoint line2End) {
	CGFloat a = line1End.x - line1Start.x;
	CGFloat b = line1End.y - line1Start.y;
	CGFloat c = line2End.x - line2Start.x;
	CGFloat d = line2End.y - line2Start.y;
	CGFloat rads = acos(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d))));
	return radiansToDegrees(rads);
}