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#pragma once
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);
}
}
}
static float LimitRadianAngle(float angle)
{
float result;
if (angle < -25.0f)
result = -25.0f;
else if (angle > 25.0f)
result = 25.0f;
else
result = angle;
while (result >= PI) {
result -= 2 * PI;
}
while (result < -PI) {
result += 2 * PI;
}
return result;
}
static float GetRadianAngleBetweenPoints(float x1, float y1, float x2, float y2)
{
float x = x2 - x1;
float y = y2 - y1;
if (y == 0.0f)
y = 0.0001f;
if (x > 0.0f) {
if (y > 0.0f)
return PI - atan2(x / y, 1.0f);
else
return -atan2(x / y, 1.0f);
} else {
if (y > 0.0f)
return -(PI + atan2(x / y, 1.0f));
else
return -atan2(x / y, 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()/float(MYRAND_MAX + 1)); }
static int32 GetRandomNumberInRange(int32 low, int32 high)
{ return low + (high - low)*(GetRandomNumber()/float(MYRAND_MAX + 1)); }
};
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