Writing text in opengl window c++

[Anonymous2]

I am trying to write text where ever the cursor is located in the opengl window. But my code will not display the text when I type. it only displays when i click first. and the it disappears when i open the menu and reappears when I click again. How do I fix this?

Code is in C++ below:

#include <iostream>// include iostream library
#include <cmath>// include cmath library
#include <GL/glut.h> // include GLUT library


using namespace std;
int ch = 0;

//***********************************************************************************
void drawAxis()
{
	glPointSize(1); // change point size back to 1
	glBegin(GL_POINTS); // use points to form X-/Y-axes
	glColor3f(0, 0, 0); // change drawing color to black
	for (int x = -150; x <= 150; x++) // draw X-axis
		glVertex2i(x, 0);
	for (int y = -150; y <= 150; y++) // draw Y-axis
		glVertex2i(0, y);
	glEnd();

	glRasterPos2i(150, 5);
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, 'X');
	glRasterPos2i(5, 150);
	glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, 'Y');
}

//***********************************************************************************
void myInit()
{
	glClearColor(1, 1, 1, 0); // specify a background clor: white
	gluOrtho2D(-200, 200, -200, 200); // specify a viewing area
}

//***********************************************************************************
void myDisplayCallback()
{
	glClear(GL_COLOR_BUFFER_BIT); // draw the background
	drawAxis();
	glFlush(); // flush out the buffer contents
}

bool started = false;
int x, y = -1000;
int r, g, b = 0;
float offset = 0;
std::string message = "";
void myKeyboardCallback(unsigned char key, int cursorX, int cursorY) {
	message += key;
	myDisplayCallback();
	if (started == false) {
		x = cursorX - 200;
		y = 200 - cursorY;
	}
	glColor3f(r, g, b);
	glRasterPos2i(x, y);
	for (int i = 0; i < message.length(); i++) {
		glutBitmapCharacter(GLUT_BITMAP_9_BY_15, message[i]);
	}

	started = true;
	glFlush();
}

void myMenuCallback(int value)
{
	switch (value)
	{
	case 1: {
		r = 1;
		g = 0;
		b = 0;
		glColor3f(r, g, b);
		glRasterPos2i(x, y);

		ch = 1;
		break; }

	case 2: {
		r = 0;
		g = 0;
		b = 1;
		glColor3f(r, g, b);
		glRasterPos2i(x, y);

		ch = 2;
		break;
	}
	case 3: {
		r = 0;
		g = 1;
		b = 0;
		glColor3f(r, g, b);
		glRasterPos2i(x, y);

		ch = 3;
		break; }
	case 4: {
		exit(0);
		break;
	}
	case 5: {

		ch = 5;
		break;
	}

	case 6: {

		ch = 6;
		break;
	}
	case 7: {

		ch = 7;
		break;
	}
	case 8: {

		ch = 8;
		break;
	}
	case 9: {

		ch = 9;
		break;
	}
	}

	myDisplayCallback();
}


void myMotionCallback(int cursorX, int cursorY) {
	myDisplayCallback();
	glColor3f(r, g, b);
	x = cursorX - 200;
	y = 200 - cursorY;
	glRasterPos2i(x, y);
	for (int i = 0; i < message.length(); i++) {
		if (ch == 5) { glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, message[i]); }
		if (ch == 6) { glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, message[i]); }
		if (ch == 7) { glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, message[i]); }
		if (ch == 8) { glutBitmapCharacter(GLUT_BITMAP_HELVETICA_12, message[i]); }
		if (ch == 9) { glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, message[i]); }
		if (ch == 1 || ch == 2 || ch == 3) {
			glutBitmapCharacter(GLUT_BITMAP_9_BY_15, message[i]);
		}
	}
	glFlush();
}

//***********************************************************************************
int main(int argc, char** argv)
{
	glutInit(&argc, argv); // optional in our environment
						//getUserInput();
	glutInitWindowSize(400, 400); // specify a window size
	glutInitWindowPosition(100, 0); // specify a window position
	glutCreateWindow("Simple Text Drawing"); // create a titled window
	myInit(); // setting up
	glutDisplayFunc(myDisplayCallback); // register a callback
	glutKeyboardFunc(myKeyboardCallback);



	int sub1 = glutCreateMenu(myMenuCallback);

	glutAddMenuEntry("Red", 1);
	glutAddMenuEntry("Blue", 2);
	glutAddMenuEntry("Green", 3);
	glutCreateMenu(myMenuCallback);
	int sub2 = glutCreateMenu(myMenuCallback);

	glutAddMenuEntry("TIMES_ROMAN_10", 5);
	glutAddMenuEntry("TIMES_ROMAN_24", 6);
	glutAddMenuEntry("HELVETICA_10", 7);
	glutAddMenuEntry("HELVETICA_12", 8);
	glutAddMenuEntry("HELVETICA_18", 9);

	glutCreateMenu(myMenuCallback);
	glutAddSubMenu("Colors", sub1);
	glutAddSubMenu("Fonts", sub2);




	glutAddMenuEntry("Exit", 4);
	glutAttachMenu(GLUT_RIGHT_BUTTON);

	glutMotionFunc(myMotionCallback);
	glutMainLoop(); // get into an infinite loop
	return 0;
}