//using the sine table, we return cosine by adding 90 degrees from the sine
float getCos(unsigned int val, TABLES *tab)
{
if(val < 270)
{
return getSin(val+90, tab);
}else
{
return getSin(val-270, tab);
}
return cos(val); //if value is out of range, we do a live (slower) cosine calculation
}
void Camera::move(int direction){// direction = 1 to front, direction = -1 to backwards
i[0] += speed * direction * getCos();
i[1] += speed * direction * d[1];
i[2] += speed * direction * getSin();
refreshDirection();
refreshLookAt();
}
void Body::applyForce(Vec2 f, Point p) {
if (length(f) == 0)
return;
if (p != getMassCenter() && !fixedAngle) {
Vec2 n = getMassCenter()-p;
force += getOrientedVec(n, length(f)*getCos(f, n));
momentium += getSin(f,n)*length(f)*distance(p, getMassCenter());
} else {
force += f;
}
}
void update() {
position[3][0] = distance * getCos();
position[3][2] = distance * getSin();
rotation = rotate(glm::mat4(), (float)(-glutGet(GLUT_ELAPSED_TIME) * 0.025f * orbitRadians * SPEED), glm::vec3(0.0f, 1.0f, 0.0f));
orientation = position * rotation;
return;
}
int getCurrentSinValue(void){
static uint8_t state = GETXSIN;
int sinval;
switch(state){
case GETXSIN:
slopepos_current = slopepos[sinindex];
sinval = (int)getSin(sinpos_current = sinpos[sinindex])+xoffs;
break;
case GETYSIN:
sinval = (int)getCos(sinpos_current)+yoffs;
default: break;
}
/*if (NOSINSTATE == ++state){
state = GETXSIN;
}*/
//only two states. toggle them
state ^= 1;
return sinval;
}
DSPFLOAT SinCos::getSin (DSPFLOAT Phase) {
if (Phase < 0)
return -getSin (- Phase);
return imag (Table [fromPhasetoIndex (Phase)]);
}
void Camera::refreshDirection(){
d[0] = getCos() + i[0];
d[2] = getSin() + i[2];
}