C++ Asteroids

Hello,

I have been programming an Asteroids-like game in C++ in Xcode on Mac OSX. The only problem I have run into is that for some reason, Xcode is saying that I have an out-of-line definition, my drawAsteroid declaration, which I believe I have actually declared correctly. Here is the code where this all happens. This is not the full source code of the game, it is just where I believe the error is occurring.

cpp file:

#include "colors.h"
#include <GLUT/glut.h>
#define _USE_MATH_DEFINES
#include <cmath>

void Color::drawAsteroid(float x, float y, float size, float angle, Jet state)
{
    glPushMatrix();
    glTranslatef(x, y, 0);
    glScalef(0, 0, 1);
    glColor3f(0.5, 0.5, 0.5);
    glBegin(GL_POLYGON);
    for (int i = 0; i < 5; ++i)
        glVertex2f(sin(2 * M_PI / 5 * i), cos(2 * M_PI / 5 * i));
    glEnd();
    glPopMatrix();
        
}

And here is the .h file where the code from the .h file where I declare the drawAsteroid declaration

#pragma once
#include "jet.h"
class Color
{
public:
    void drawAsteroid(float x, float y, float size, float angle);
    void drawShip(float x, float y, float angle, Jet );
    void drawBullet(float x, float y);
};

Any help would be much appreciated!!