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Does anyone know how to Colour Cycle in C++?
I’ve made a program that rotates, translates and expands 2 letters

Now I need to make either my background colour or the Initials P or O change colours either by a mouse/key press or automatically timed

does anyone know how I can incorporate this into my code?

#include "stdafx.h"
#include "glut.h"

#define KEY_UP 101
#define KEY_DOWN 103
#define KEY_LEFT 100
#define KEY_RIGHT 102

int tx=0, ty=0;// translate distances should make global if to be controlled interactivly.
float sx=1.0, sy=1.0; // scaling factors should be 1 by default.
float theta=0.0;

void letter_P()// drawing object P
{

glColor3f (1.0, 0.0, 0.0); // set line colour red

glLineWidth(5.0);// set line width

glBegin(GL_LINES);// beginning of drawing
glVertex2i(75, 150);
glVertex2i(75, 600);
glVertex2i(75, 600);
glVertex2i(200, 600);
glVertex2i(200, 600);// left side line
glVertex2i(200, 300);
glVertex2i(200,300);
glVertex2i(75, 300);
// right hand side line
glEnd();// finishing drawing.
}

void letter_O()//drawing object O
{

glColor3f (0.0, 1.0, 0.0); // set line colour red

glLineWidth(5.0);// set line width or add more line styles

glBegin(GL_LINE_STRIP);
glVertex2i(400, 150);// link most lines together
glVertex2i(400, 600);
glVertex2i(400, 600);
glVertex2i(500, 600);
glVertex2i(500, 600);
glVertex2i(500, 150);
glVertex2i(500, 150);
glVertex2i(400, 150);
glEnd();

}

void init (void)
{
/* select clearing color */
glClearColor (0.0, 0.0, 1.0, 0.0);

/* initialize viewing values */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, 700.0, 0.0, 800.0);

}

void display()// display letters PO.
{
glClear (GL_COLOR_BUFFER_BIT); // clear screen

letter_P();
letter_O();
glFlush();
}
void myKeyboardFunc (unsigned char key, int x, int y)
{
switch (key) {

case ‘t’:
tx= tx + 1.0;
ty= ty + 1.0;
glutPostRedisplay();
break;
case ’s’:
sx=sx * 0.99;
sy=sy * 0.99;
glutPostRedisplay();
break;
case ‘S’:
sx=sx * 1.01;
sy=sy * 1.01;
glutPostRedisplay();
break;

case 27:// Escape key
exit(0);
break;
}
}

GLvoid window_special_key(int key, int x, int y)
{
switch (key) {

case KEY_RIGHT:
theta=theta-1.57; // rotation right-hand (clockwise) side
glutPostRedisplay();
break;

case KEY_LEFT:
theta=theta+1.57;// rotation left-hand (anti-colckwise) side
glutPostRedisplay();
break;

default:
printf ("Pressing %d doesn’t do anything.\n", key);
break;
}
}
void displayscreen(void)
{
/* clear all pixels */
glClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

// Translate

glPushMatrix();
glTranslatef(tx,ty,0.0);// OpenGL translate function.
letter_P();
glPopMatrix();

// Scale

glPushMatrix();
glTranslatef(75*(1-sx),75*(1-sy),0);
glScalef(sx,sy,0.0);// OpenGL scaling function.
letter_O();
glPopMatrix();

glPushMatrix();
glRotatef(theta, 0.0, 0.0, 1.0);// Rotation around origin.
letter_O();
glPopMatrix();

glFlush ();
}

int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize (700, 500);
glutInitWindowPosition (100, 100);
glutCreateWindow ("Drawing Letters PO");
init ();
glutDisplayFunc(displayscreen);
glutKeyboardFunc(myKeyboardFunc);
glutSpecialFunc(&window_special_key);

printf("Press \n’s’ to scale to shrink around (0,0), \n’S’ to scale to expand, \n’t’ to translate.\n’->’ rotate right\n’<-’ rotate left\n\n");

glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}