const Note *getPreviousNote(const Voice &voice, int position, int string,
const Voice *prevVoice)
{
const Position *prevPos = getPreviousPosition(voice, position);
if (!prevPos && prevVoice)
prevPos = getPreviousPosition(*prevVoice, std::numeric_limits<int>::max());
return prevPos ? Utils::findByString(*prevPos, string) : nullptr;
}
// the move function for the whole snake
inline void snake_head::move(float dy, float dx){
if(dx == 0 && dy == 0){
return;
}
//update the snake head position
vec3 pp = getCurrentPosition();
setPreviousPosition(pp);
vec3 cp = vec3(pp[0] + dx, pp[1] + dy, pp[2]);
setCurrentPosition(cp);
//update the first body position
pp = body[0].getCurrentPosition();
body[0].setPreviousPosition(pp);
cp = getPreviousPosition();
body[0].setCurrentPosition(cp);
//update the rest of body position if exist
for(int i = 1; i < numberOfBody; i++){
vec3 old_cp = body[i].getCurrentPosition();
body[i].setPreviousPosition(old_cp);
vec3 new_cp = body[i-1].getPreviousPosition();
body[i].setCurrentPosition(new_cp);
}
}
