Why is my OpenGL not rotating when I placed it at tab bar?
private void simpleOpenGlControl1_Paint_1(object sender, PaintEventArgs e)
{
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT);
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Gl.glTranslated(0, 0, -5);
Gl.glRotated(yrot += 1, 1, 1, 0);
Gl.glPointSize(3);
Gl.glPolygonMode(Gl.GL_FRONT, Gl.GL_LINES);
Gl.glPolygonMode(Gl.GL_BACK, Gl.GL_LINES);
Gl.glBegin(Gl.GL_QUADS);
{
////Vista posterior
Gl.glColor3ub(255, 0, 255);
Gl.glVertex3d(0, 1, -1);
Gl.glVertex3d(1, -1, -1);
Gl.glVertex3d(-1, -1, -1);
Gl.glVertex3d(0, 1, -1);
////DEBAJO
Gl.glColor3ub(0, 255, 255);
Gl.glVertex3d(-1, -1, -1);
Gl.glVertex3d(1, -1, -1);
Gl.glVertex3d(1, -1, 1);
Gl.glVertex3d(-1, -1, 1);
////POR LA IZQUIERDA
Gl.glColor3ub(255, 255, 0);
Gl.glVertex3d(0, 1, -1);
Gl.glVertex3d(-1, -1, -1);
Gl.glVertex3d(-1, -1, 1);
Gl.glVertex3d(0, 1, 1);
////POR LA DERECHA
Gl.glColor3ub(0, 0, 255);
Gl.glVertex3d(0, 1, 1);
Gl.glVertex3d(1, -1, 1);
Gl.glVertex3d(1, -1, -1);
Gl.glVertex3d(0, 1, -1);
Gl.glColor3ub(255, 0, 0);
Gl.glVertex3d(0, 1, 1);
Gl.glVertex3d(-1, -1, 1);
Gl.glVertex3d(1, -1, 1);
Gl.glVertex3d(0, 1, 1);
Gl.glEnd();
}
I put on tab, but when I click another tab and back to OpenGL tab the 3D object changes but it does not rotate.
Unless you use a timer to force repaint any N times per second, the paint event only occurs when needed.
When you switch between tabs, a redraw is needed and a paint event occurs. That why you see a little change at this time.
You possibly will see the same thing by reducing/maximizing your window, etc...
You should:
yrot on paint event. Because you didn't know when it's called you have no control on the rotation speed. Use the timer, or a time-based interpolation of the value.