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SKMathVector.m
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SKMathVector.m
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//
// SKMathVector.m
// Skirmish
//
// Created by Daryl on 31/01/2008.
// Copyright 2008 Daryl Dudey. All rights reserved.
//
#import "SKMathVector.h"
@implementation SKMathVector
- (vector)addVector:(vector)a plus:(vector)b
{
vector r;
r.x = a.x + b.x;
r.y = a.y + b.y;
r.z = a.z + b.z;
return r;
}
- (vector)subVector:(vector)a plus:(vector)b
{
vector r;
r.x = a.x - b.x;
r.y = a.y - b.y;
r.z = a.z - b.z;
return r;
}
- (CGFloat)dot:(vector)a plus:(vector)b
{
return (a.x * b.x) + (a.y * b.y) + (a.z * b.z);
}
- (vector)getNormal:(vector)a plus:(vector)b
{
vector result;
CGFloat distance;
result.x = a.y * b.z - a.z * b.y;
result.y = a.z * b.x - a.x * b.z;
result.z = a.x * b.y - a.y * b.x;
distance = sqrt(result.x*result.x + result.y*result.y + result.z*result.z);
result.x = -result.x/distance;
result.y = -result.y/distance;
result.z = -result.z/distance;
return result;
}
- (vector)normalize:(vector)a
{
vector result;
CGFloat distance;
result.x = a.x;
result.y = a.y;
result.z = a.z;
distance = sqrt(result.x*result.x + result.y*result.y + result.z*result.z);
result.x = result.x/distance;
result.y = result.y/distance;
result.z = result.z/distance;
return result;
}
@end