blob: 8e1a2521c8850d53abd22af2cb9755efe63a7347 (
plain) (
blame)
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
|
class CGeneral
{
public:
static float GetATanOfXY(float x, float y){
// why exactly doesn't this work?
// if(y >= 0.0f) return atan2(x, y);
// return atan2(x, y) + 2*M_PI;
if(x == 0.0f && y == 0.0f)
return 0.0f;
float xabs = fabs(x);
float yabs = fabs(y);
if(xabs < yabs){
if(y > 0.0f){
if(x > 0.0f)
return 0.5f*PI - atan2(x / y, 1.0f);
else
return 0.5f*PI + atan2(-x / y, 1.0f);
}else{
if(x > 0.0f)
return 1.5f*PI + atan2(x / -y, 1.0f);
else
return 1.5f*PI - atan2(-x / -y, 1.0f);
}
}else{
if(y > 0.0f){
if(x > 0.0f)
return atan2(y / x, 1.0f);
else
return PI - atan2(y / -x, 1.0f);
}else{
if(x > 0.0f)
return 2.0f*PI - atan2(-y / x, 1.0f);
else
return PI + atan2(-y / -x, 1.0f);
}
}
}
// not too sure about all these...
static uint16 GetRandomNumber(void)
{ return myrand() & 0xFFFF; }
// Probably don't want to ever reach high
static float GetRandomNumberInRange(float low, float high)
{ return low + (high - low)*(GetRandomNumber()/65536.0f); }
};
|
