$fn = 64;

// --- Parameters ---
tube_diameter = 26; // Diameter for standard paint tubes (acrylic/oil)
tube_depth = 40;    // Depth of the slots
hole_angle = 30;    // Angle of tubes leaning back
cols = 5;           // Number of columns
rows = 2;           // Number of rows (10 tubes total)
spacing_x = 34;     // Horizontal spacing between holes
spacing_y = 35;     // Depth spacing between rows

depth = 95;         // Overall depth of the rack body
height_front = 35;  // Height at the front
height_back = 75;   // Height at the back
width = cols * spacing_x + 10; // Overall width

module rack() {
    union() {
        // Main Body with Angled Slots
        difference() {
            // Solid wedge body
            hull() {
                cube([width, depth, 0.1]); // Base
                translate([0, depth - 0.1, 0]) cube([width, 0.1, height_back]); // Back face
                translate([0, 0, 0]) cube([width, 0.1, height_front]); // Front face
            }

            // Subtracted Tube Holes
            for (c = [0 : cols - 1]) {
                for (r = [0 : rows - 1]) {
                    // Calculate positions
                    x_pos = 5 + (spacing_x / 2) + c * spacing_x;
                    y_pos = 30 + r * spacing_y;
                    z_pos = height_front + (y_pos / depth) * (height_back - height_front);

                    // Main cylindrical hole
                    translate([x_pos, y_pos, z_pos + 5])
                    rotate([-hole_angle, 0, 0])
                    translate([0, 0, -tube_depth - 5])
                    cylinder(d=tube_diameter, h=tube_depth + 15);

                    // Chamfered rim for easy tube insertion
                    translate([x_pos, y_pos, z_pos + 2])
                    rotate([-hole_angle, 0, 0])
                    translate([0, 0, -4])
                    cylinder(d1=tube_diameter, d2=tube_diameter + 4, h=6);
                }
            }
        }

        // --- ArtArsenal / Universal Wall Rail Mount ---
        // Upper Standoff
        translate([0, depth, height_back - 15])
        cube([width, 10, 15]);

        // Downward Hook (Cleat)
        translate([0, depth + 10, height_back - 15])
        hull() {
            translate([0, -4, 0]) cube([width, 4, 15]); // Base attached to standoff
            translate([0, -8, -10]) cube([width, 2, 2]); // Angled tip hooking downward
        }

        // Lower Spacer (keeps the rack parallel to the wall)
        translate([0, depth, 5])
        cube([width, 10, 10]);
    }
}

// Render the final object
rack();