$fn = 72;

pcb_width  = 257.175;
pcb_height =  95.250;
 
module keyboard_base_plate(pcb_width, pcb_height) {
    pcb_clearance_edge   = 1.0;
    pcb_clearance_bottom = 2.0;
    
    thickness     = 2.0;
    height        = 14.0;
    corner_radius = thickness / 2.0;

    module round_corner(translation, rotation) {
        translate(translation)
        rotate(rotation)
        rotate_extrude(angle=90) {
            intersection() {
                circle(r=corner_radius);
                square(corner_radius*2);
            }
        }
    }

    module round_edge(length, translation, rotation) {
        translate(translation)
        rotate(rotation)
        linear_extrude(length)
        intersection() {
            circle(r=corner_radius);
            square(corner_radius*2);
        }
    }

    /* Lower left corner */
    round_corner([0 - pcb_clearance_edge,
                  0 - pcb_clearance_edge, 0], [-90, 90, 90]);

    /* Upper left orner */
    round_corner([0 - pcb_clearance_edge,
                      pcb_clearance_edge + pcb_height, 0], [0, 90, 90]);

    /* Upper right corner */
    round_corner([pcb_clearance_edge + pcb_width,
                  pcb_clearance_edge + pcb_height, 0], [90, 90, 90]);

    /* Lower right corner */
    round_corner([    pcb_clearance_edge + pcb_width,
                  0 - pcb_clearance_edge, 0], [180, 90, 90]);

    /* Top edge */
    round_edge( 2 * pcb_clearance_edge + pcb_width,
               [0 - pcb_clearance_edge,
                    pcb_clearance_edge + pcb_height, 0], [0, 90, 0]);
         
    /* Right edge */
    round_edge( 2 * pcb_clearance_edge + pcb_height,
               [    pcb_clearance_edge + pcb_width,
                0 - pcb_clearance_edge, 0], [270, 0, 0]);
         
    /* Bottom edge */
    round_edge(2 * pcb_clearance_edge + pcb_width,
               [0 - pcb_clearance_edge,
                0 - pcb_clearance_edge, 0], [90, 180, 90]);
         
    /* Left edge */
    round_edge( 2 * pcb_clearance_edge + pcb_height,
               [0 - pcb_clearance_edge,
                0 - pcb_clearance_edge, 0], [270, 90, 0]);

    linear_extrude(thickness)
        translate([0 - pcb_clearance_edge,
                   0 - pcb_clearance_edge, 0])
            square([2 * pcb_clearance_edge + pcb_width,
                    2 * pcb_clearance_edge + pcb_height],
                   false);
}

keyboard_base_plate(pcb_width, pcb_height);