Hi guys Iam new to OpenGL. Iam trying to create a small circle and would like to position it in the bottom-left corner of the screen. The code below draws a massive circle. Could you please tell me how to change the size of the circle and the position of it to a specific place on the window.

Thanks


Code :
 
#define PI 3.1415926535898
GLint circle_points =100;
 
void Circle()
{
 
    glClear(GL_COLOR_BUFFER_BIT);
    double angle = 2*  PI/circle_points ;
 
    glBegin(GL_LINE_LOOP);
        double angle1=0.0;
        glVertex2d( cos(0.0) , sin(0.0));
        int i;
        for ( i=0 ; i< circle_points ;i++)
        {
            printf( "angle = %f \n" , angle1);
            glVertex2d(cos(angle1),sin(angle1));
            angle1 += angle ;
        }
    glEnd();
    glFlush();
}