Custom FEFCO Types

While PackCPQ supports standard FEFCO styles (like 0201 shippers or 0427 mailers) out-of-the-box, you can easily register custom parametric boxes, carton folders, or custom creasing layouts directly in the self-hosted engine.

1. The Template Interface

To register a custom design, create a struct implementing the CalculateFlatArea and GetScoringLines interfaces:

// fefco_custom_mailer.go
package templates

import "github.com/alanvihan/packcpq/engine/types"

type CustomMailer struct {
    Length float64 `json:"length"`
    Width  float64 `json:"width"`
    Depth  float64 `json:"depth"`
    Flute  float64 `json:"flute_caliper"`
}

func (c *CustomMailer) CalculateFlatArea() float64 {
    // Length-way flat layout sizing sheet
    flatLength := (2.0 * c.Length) + (4.0 * c.Depth) + (6.0 * c.Flute)
    // Width-way flat layout sizing sheet
    flatWidth := c.Width + (2.0 * c.Depth) + (4.0 * c.Flute)
    
    return flatLength * flatWidth
}

func (c *CustomMailer) GetScoringLines() []types.ScoreLine {
    return []types.ScoreLine{
        {Position: c.Depth + (2.0 * c.Flute), Type: "Crease"},
        {Position: c.Depth + c.Length + (4.0 * c.Flute), Type: "Crease"},
    }
}

2. Compiling the Engine Core

Place your custom stubs inside the /custom/templates/ directory of your local repository and run compilation diagnostics:

$ make compile-custom-templates