qt openGL - sphere gets disformed - c++

Question

I am trying to draw a sphere and a rotating cube around it. I am able to draw both of them perfectly seperately. Nevertheless once I draw both together I get strange results.
my sphere gets disformed.
when I change the angle of my cubeon purpose (by pressing on a button) it just dissapears from my screen.
when I only draw the cube and theng change the angle everything works fine.
Why please?
image: http://imgur.com/dIngayh (the cube looks ok, but the sphere is too stretched)
My code:
void MyGLWidget::paintGL()
{
glScalef(1,1,1);
setLight();
drawSun();
drawCube();
}
void MyGLWidget::initializeGL()
{
glClearColor(0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_SMOOTH);
glEnable(GL_TEXTURE_2D);
}
void MyGLWidget::drawSun()
{
glPushMatrix();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glScalef(1,1,1);
glLoadIdentity();
GLUquadricObj *quadric=gluNewQuadric();
gluQuadricNormals(quadric, GLU_SMOOTH);
glColor3f(1,1,0);
gluSphere(quadric, 0.25, 360,360);
gluDeleteQuadric(quadric);
glPopMatrix();
}
void MyGLWidget::drawCube()
{
glTranslatef(0, 0, 0);
glRotatef(getCubeAngle(), 1.0f, 0.0f, 0.0f);
glRotatef(0, 0.0f, 1.0f, 0.0f);
glRotatef(0, 0.0f, 0.0f, 1.0f);
glTranslatef( 0.5, 0, 0);
glBegin(GL_QUADS);
//back side of cube
glColor3f(255,0,0);
glVertex3f(-0.1, 0.1,-0.1 );//upper left corner
glVertex3f(0.1, 0.1,-0.1); //uper right
glVertex3f(0.1,-0.1,-0.1 ); // down left
glVertex3f(-0.1,-0.1,-0.1); // down right
/*draws other parts of the cube in the same way*/
glEnd();
glFlush();
}
/**/
void MyGLWidget::setLight()
{
// Prepare light parameters.
float SHINE_ALL_DIRECTIONS = 1;
float lightPos[4] = {-30, 0, 0, SHINE_ALL_DIRECTIONS};
float lightColorAmbient[4] = {50, 50, 0.1, 1};
float lightColorSpecular[4] = {150, 150, 0.5, 1};
// Set light parameters.
glLightfv(GL_LIGHT1, GL_POSITION, lightPos);
glLightfv(GL_LIGHT1, GL_AMBIENT, lightColorAmbient);
glLightfv(GL_LIGHT1, GL_SPECULAR, lightColorSpecular);
// Enable lighting in GL.
glEnable(GL_LIGHT1);
glEnable(GL_LIGHTING);
// Set material properties.
float rgba[3] = {0.3, 0.5, 1};
glMaterialfv(GL_FRONT, GL_AMBIENT, rgba);
glMaterialfv(GL_FRONT, GL_SPECULAR, rgba);
glMaterialf(GL_FRONT, GL_SHININESS, 0.5f);
}

Answer 1

try to add this one:
void MyGLWidget::resizeGL(int width, int height);
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glScalef(height *1./width, 1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
}
and more read here (rus)