Hi!

I'm playing around with rotations and would like to know how this could be solve in a good way.

I would like to rotate something from a starting angle to a and angle.

Let's say from 120 degrees to 360 degrees. So when I reach 360 it should stop rotating.

Probably simple but I can't get it right.

void update(float elapsedTime)
{
  //my rotation goes here

}

Wrote this at work, no idea if it compiles or if my logic is even close to correct (spent like 5minutes on it lol)

#ifndef ROTATE_H
#define ROTATE_H

class PerformRotate
{
public:
	PerformRotate(float start, float goal);
	bool Update(float dt);
	

	float GetCurrent(){return m_current;}
private:
	float m_start;
	float m_goal;
	float m_current;
};
#endif

#include "Rotate.h"

PerformRotate::PerformRotate(float start, float goal)
{
	m_start = start;
	m_goal = goal;
	m_current = start;
}
bool PerformRotate::Update(float dt)
{
	float difference = m_goal - start;
	float other = 360 - abs(difference);
	
	if(abs(other) > abs(difference))
	{
		m_current += difference * dt;
		
		if((m_current >= m_goal) && (difference * dt > 0))
			return true;
		else if((m_current <= m_goal) && (difference * dt < 0))
			return true;
	}
	else
	{
		m_current += other * dt;
		
		if((m_current >= m_goal) && (other * dt > 0))
			return true;
		else if((m_current <= m_goal) && (other * dt < 0))
			return true;
	}
	return false;
}

can you explain more clearly? I could help you but I don't really understand what you need to do

what does your code look like now?

in most cases you can use glRotatef( [your rotation value], [x coordinate], [y coordinate], [z coordinate] ) before you draw

> where xyz are the coordinates of the point to rotate around & rotation value is in degrees