I just want to draw a cylinder in opengl. I found lots of samples but all of them draws cylinders in z axis. I want them be in x or y axis. How can i do this. The code below
You can use glRotate(angle, x, y, z)
to rotate your coordinate system:
GLUquadricObj *quadratic;
quadratic = gluNewQuadric();
glRotatef(90.0f, 0.0f, 1.0f, 0.0f);
gluCylinder(quadratic,0.1f,0.1f,3.0f,32,32);
http://www.opengl.org/sdk/docs/man/xhtml/glRotate.xml
On every render use glPushMatrix
glRotatef
draw the cylinder and finish your drawing with glPopMatrix
.
Ex.: glRotatef(yRotationAngle, 0.0f, 1.0f, 0.0f); // Rotate your object around the y axis on yRotationAngle radians
Ex.: OnRender()
function example
void OnRender() {
glClearColor(1.0f, 0.0f, 0.0f, 1.0f); // Clear the background
glClear(GL_COLOR_BUFFER_BIT); //Clear the colour buffer
glLoadIdentity(); // Load the Identity Matrix to reset our drawing locations
glRotatef(yRotationAngle, 0.0f, 1.0f, 0.0f); // Rotate our object around the y axis on yRotationAngle radians
// here *render* your cylinder (create and delete it in the other place. Not while rendering)
gluCylinder(quadratic,0.1f,0.1f,3.0f,32,32);
glFlush(); // Flush the OpenGL buffers to the window
}