// 2020 Extrusion Insert
// Configurable 3D printable insert for 2020 aluminum extrusion

// Import PCIe holder functionality
include <holder.scad>;

// Trapezium module - creates a centralized trapezoid shape
// Parameters:
//   base_width: width of the bottom edge
//   top_width: width of the top edge  
//   height: height of the trapezium
//   depth: depth/thickness of the shape (default 1)
module trapezium(base_width, top_width, height, depth = 1) {
    // Calculate the difference in width
    width_diff = base_width - top_width;
    
    // Create the trapezoid points (centered)
    points = [
        [-base_width/2, -height/2],  // bottom left
        [base_width/2, -height/2],   // bottom right
        [top_width/2, height/2],     // top right
        [-top_width/2, height/2]     // top left
    ];
    
    // Extrude the 2D trapezoid to create 3D shape
    linear_extrude(height = depth, center = true) {
        polygon(points);
    }
}

// Example usage (uncomment to test):
trapezium(base_width = 20, top_width = 10, height = 15, depth = 3);