-
Notifications
You must be signed in to change notification settings - Fork 0
/
vec2.cpp
58 lines (48 loc) · 937 Bytes
/
vec2.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
#include "vec2.h"
// Magnitude
float mag( vec2_t v ) {
return sqrt( v.x * v.x + v.y * v.y ) ;
}
float magSqr( vec2_t v ) {
return v.x * v.x + v.y * v.y ;
}
// Angle
float getAngle( vec2_t v ) {
return atan2( v.y, v.x ) ;
}
// Add
vec2_t add( vec2_t v, vec2_t w ) {
vec2_t tmp ;
tmp.x = v.x + w.x ;
tmp.y = v.y + w.y ;
return tmp;
}
// Sub
vec2_t sub( vec2_t v, vec2_t w ) {
vec2_t tmp ;
tmp.x = v.x - w.x ;
tmp.y = v.y - w.y ;
return tmp;
}
// Multiply with a scalar value
vec2_t mul( float k, vec2_t v ) {
vec2_t tmp ;
tmp.x = k * v.x ;
tmp.y = k * v.y ;
return tmp ;
}
// unit vector, normalization
vec2_t unit( vec2_t v ) {
return mul( 1.0f / mag(v), v ) ;
}
// dot product
float dot( vec2_t v, vec2_t w ) {
return v.x * w.x + v.y * w.y ;
}
// unit vector in the direction of given angle
vec2_t direction( float angle ) {
vec2_t dir ;
dir.x = cos( angle ) ;
dir.y = sin( angle ) ;
return dir ;
}