Thread: OpenGL rotation of merry-go-round

I have rendered a merry-go-round in the following code. However, when I set rotation, it just gives me rotation of the whole thing around the y-axis but not a self-rotation. My question is how can I change the following code to give self-rotation (either clockwise or counter-clockwise) but not rotation of the whole thing around the y-axis.
The code that gives rotation is in the third paragraph in the line glRotatef(angle,0.0f, 1.0f, 0.0f); The idle function is just let the angle +1 degree. If the angle exceeds 360 degrees, then minus 360 degrees.
Than You.

Code:

        glPushMatrix();	
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(0.0f, -100.0f, 70.0f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 5.0f,5.0f, 10, 20, 20);
	glPopMatrix();

	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(0.0f, -85.0f, 70.0f);
	glutSolidSphere(5.0f, 20, 20);
	glPopMatrix();
	double xx =0.003f;

	glPushMatrix();
	glRotatef(angle,0.0f, 1.0f, 0.0f);
	for(double i=-85.0; i>-88.0; i-=0.1f){
	
	glPushMatrix();
	glColor3f(0.25f+xx, 0.206f+xx, 0.747f+xx);
	glTranslatef(0.0f, i, 70.0f);
		
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluDisk(quadric, 0, 50.0f, 60, 10);
	glPopMatrix();
	xx+=0.005f;
	}

	

	//right long
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(40.0f, -85.0f, 70.0f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	
	gluCylinder(quadric, 1.0f,1.0f, 20, 20, 20);
	glPopMatrix();

	//right short
	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.77f);
	glTranslatef(10.0f, -85.0f, 70.0f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 10, 20, 20);
	glPopMatrix();


	 glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.07f);
	glTranslatef(40.0f, -65.0f, 70.0f);
	glRotatef(-90.0f, 0.0f, 1.0f, 0.0f);
	glRotatef(18.43f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 31.62f, 20, 20);
	glPopMatrix();
			 
	//left long
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(-40.0f, -85.0f, 70.0f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 20, 20, 20);
	glPopMatrix();

	//left short
	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.77f);
	glTranslatef(-10.0f, -85.0f, 70.0f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 10, 20, 20);
	glPopMatrix();

	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.07f);
	glTranslatef(-10.0f, -75.0f, 70.0f);
	glRotatef(-90.0f, 0.0f, 1.0f, 0.0f);
	glRotatef(-18.43f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 31.62f, 20, 20);
	glPopMatrix();

	//inner left right
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(-20.0f, -85.0f, 35.4f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 20, 20, 20);
	glPopMatrix();

	//inner left short
	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.77f);
	glTranslatef(-5.0f, -85.0f, 61.3f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 10, 20, 20);
	glPopMatrix();

	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.07f);
	glTranslatef(-5.0f, -75.0f, 61.30f);
	glRotatef(210.0f, 0.0f, 1.0f, 0.0f);
	glRotatef(-18.43f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 31.62f, 20, 20);
	glPopMatrix();
	//inner right long
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(20.0f, -85.0f, 35.4f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 20, 20, 20);
	glPopMatrix();

	//inner right short
	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.77f);
	glTranslatef(5.0f, -85.0f, 61.3f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 10, 20, 20);
	glPopMatrix();

	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.07f);
	glTranslatef(5.0f, -75.0f, 61.30f);
	glRotatef(150.0f, 0.0f, 1.0f, 0.0f);
	glRotatef(-18.43f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 31.62f, 20, 20);
	glPopMatrix();

	//outer left long
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(-20.0f, -85.0f, 105.4f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 20, 20, 20);
	glPopMatrix();

	//outer left short
	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.77f);
	glTranslatef(-5.0f, -85.0f, 78.7f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 10, 20, 20);
	glPopMatrix();

	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.07f);
	glTranslatef(-5.0f, -75.0f, 78.7f);
	glRotatef(-30.0f, 0.0f, 1.0f, 0.0f);
	glRotatef(-18.43f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 31.62f, 20, 20);
	glPopMatrix();

	//outer right long
	glPushMatrix();
	glColor3f(0.05f, 0.09f, 0.77f);
	glTranslatef(20.0f, -85.0f, 105.4f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 20, 20, 20);
	glPopMatrix();

	//outer right short
	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.77f);
	glTranslatef(5.0f, -85.0f, 78.7f);
	glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 10, 20, 20);
	glPopMatrix();

	glPushMatrix();
	glColor3f(0.95f, 0.09f, 0.07f);
	glTranslatef(5.0f, -75.0f, 78.7f);
	glRotatef(30.0f, 0.0f, 1.0f, 0.0f);
	glRotatef(-18.43f, 1.0f, 0.0f, 0.0f);
	gluCylinder(quadric, 1.0f,1.0f, 31.62f, 20, 20);
	glPopMatrix();
	glPopMatrix();
	glPopMatrix();

Originally Posted by tabstop

I'm not sure what you mean by "self-rotation". Do you want some of the individual cylinders to rotate too? Then you'll have to make those rotation angles variable as well, just as you have the main rotation use the variable "angle".

Self rotation means the whole thing does not move(no relative movement to the ground) and only the cylinders and the circular disk rotates,the desired rotation just like the real merry go round in the park.

First rotate, then translate.