How to have a GL_QUADS move sidewards?

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hello, i am new to opengl and im confused on how to use gltranslate/glrotate to let the gl_quads move sidewards, any help? following is my vertices for the gl_quads:

void display(){
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glPushMatrix();
    glTranslatef(0.3,0,0);
    //glTranslatef(0.7,0,0);
    //glRotatef(45.0,0.0,1.0,0.0);

    glBegin(GL_QUADS);
        glColor3f(1.0f, 0.5f, 0.0f);     // Orange
        glVertex2f(0,0);

        glColor3f(1.0f, 0.0f, 0.0f);     // Red
        glVertex2f(0.4,0);

        glColor3f(1.0f, 1.0f, 0.0f);     // Yellow
        glVertex2f(0.4,0.4);

        glColor3f(0.0f, 0.0f, 1.0f);     // Blue
        glVertex2f(0,0.4);


    glEnd();
    glPopMatrix();
    glutSwapBuffers();

}

What I have tried:

i have tried moving the position and the angle but i should see the "live" mode of it moving sidewards

Posted 19-Mar-18 5:28am

Member 13184387

Updated 19-Mar-18 10:02am

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Rick York · Answer 1 · 2018-03-19T10:03:00

The standard way of doing this is to have some parameter change over time. Since you want to have it move sideways then adjust the translation in the x direction. For animating it, usually people set a timer and increment the translation on each tick. In the windows world this means handling the WM_TIMER message. Here is a sample timer handling routine for an MFC window :

C++

void MyWindow::OnTimer( UINT_PTR eventId )
{
    if( eventId == MyTimerId )
    {
        m_TranslationX += increment;
        Invalidate();     // cause the window to be redrawn
    }
    __super::OnTimer( eventId );
}

// the translation call in your display function will become :

glTranslatef( m_Translation, 0, 0 );

If you want to, you can increment m_Translation until it reaches a certain value and then decrement it for a while and this will cause the quads to move to the right and then to the left.