$fn=64;

// --- Parameters ---
panel_width = 120;
panel_height = 90;
panel_thickness = 2;

tab_width = 80;
tab_height = 6;
tab_thickness = 2.6; // Slightly thinner than 3mm for clearance

emboss_thickness = 1.5;
border_width = 3;

// --- Modules ---

// Generates a classic layered pine tree
module pine_tree(h, w) {
    // Trunk
    translate([-w/10, 0]) square([w/5, h/4]); 
    // Needles/Branches
    translate([0, h*0.15]) polygon([[-w/2, 0], [w/2, 0], [0, h*0.4]]);
    translate([0, h*0.35]) polygon([[-w/2.2, 0], [w/2.2, 0], [0, h*0.4]]);
    translate([0, h*0.55]) polygon([[-w/2.5, 0], [w/2.5, 0], [0, h*0.45]]);
}

// Generates a fluffy deciduous tree
module round_tree(h, r) {
    // Trunk
    translate([-r/4, 0]) square([r/2, h/2]); 
    // Leaves
    translate([0, h*0.5]) circle(r);
    translate([-r*0.75, h*0.45]) circle(r*0.7);
    translate([r*0.75, h*0.45]) circle(r*0.7);
    translate([0, h*0.75]) circle(r*0.9);
}

// Generates the 2D forest layout
module forest_scene() {
    intersection() {
        // Bounding box to keep everything on the panel
        square([panel_width, panel_height]);
        
        union() {
            // Sun / Moon
            translate([panel_width * 0.85, panel_height * 0.75]) circle(r=10);

            // Rolling Hills
            translate([panel_width * 0.2, 0]) scale([2.5, 1]) circle(r=20);
            translate([panel_width * 0.8, 0]) scale([3, 1.2]) circle(r=22);
            translate([panel_width * 0.5, 0]) scale([3.5, 0.8]) circle(r=25);
            square([panel_width, 15]); // Fill bottom gap

            // Trees
            translate([15, 10]) pine_tree(45, 25);
            translate([35, 12]) round_tree(40, 14);
            translate([60, 15]) pine_tree(55, 30);
            translate([85, 10]) round_tree(35, 12);
            translate([105, 12]) pine_tree(50, 28);

            // Outer Frame
            difference() {
                square([panel_width, panel_height]);
                translate([border_width, border_width]) 
                    square([panel_width - border_width*2, panel_height - border_width*2]);
            }
        }
    }
}

// --- Assembly ---

union() {
    // Main Backdrop Panel
    cube([panel_width, panel_height, panel_thickness]);

    // Mounting Tab (Tapered for easy slotting, extends into baseplate)
    // Adding 0.1 to height to ensure manifold overlap with the main panel
    translate([(panel_width - tab_width)/2, -tab_height, (panel_thickness - tab_thickness)/2])
        linear_extrude(tab_thickness)
            polygon([
                [2, 0], 
                [tab_width - 2, 0], 
                [tab_width, tab_height + 0.1], 
                [0, tab_height + 0.1]
            ]);

    // Embossed Forest Details
    translate([0, 0, panel_thickness])
        linear_extrude(emboss_thickness)
            forest_scene();
}