OpenGL draw spiral

Question

The following code will create a new circle on openGL but how can I make it draw spiral instead of the circle?

    glBegin(GL_POINTS);
    for (float angle = 0; angle < 360; angle += 1)
    {
        x = 50 * cos(angle);
        y = 50 * sin(angle);
        glVertex2f(x, y);
    }
    glEnd();

Answer 1

You need to increase the radius in the loop. e.g.:

float radius = 0.0f;

glBegin(GL_POINTS);
for (float angle = 0; angle < 1440; angle += 1)
{
    x = cos(angle * M_PI / 180) * radius;
    y = sin(angle * M_PI / 180) * radius;
    radius += 0.1f;
    glVertex2f(x, y);
}
glEnd();

Note the unit of the angle of sin and cos is Radians.