$fs = 0.01;
$fa = 0.01;


// A5 = 148
page_size_width = 210; // [105, 148, 210]
page_size_height = sqrt(2)*page_size_width;

notebook_thickness = 3;
hinge_radius = 10;
number_of_hinge_segments = 5;
hinge_gap = 2;

echo(str("page size = ", page_size_height, "x", page_size_width, "mm"));






union(){
    color([0/255, 20/255, 0/255]) 
    cube(size=[page_size_width, page_size_height, notebook_thickness], center=true);

    color([128/255, 128/255, 10/255])
    translate([-page_size_width/2 - hinge_radius/2 , 0, 0])        
    cube(size=[hinge_radius, page_size_height, notebook_thickness], center=true);
}


translate([0, 0, hinge_radius*2 - notebook_thickness])     
union(){
    color([0/255, 20/255, 0/255]) 
    cube(size=[page_size_width, page_size_height, notebook_thickness], center=true);

    color([128/255, 128/255, 10/255])
    translate([-page_size_width/2 - hinge_radius/2 , 0, 0])        
    cube(size=[hinge_radius, page_size_height, notebook_thickness], center=true);
}


translate([-page_size_width/2-hinge_radius, 0, hinge_radius - notebook_thickness/2])
rotate([90, 0, 0])
cylinder(r=hinge_radius, h=10, center=true);