Shipping cost by kg

[Nikolas Reissis]

Hello everyone,

 

I would appreciate any response to my question. I see that there are similar posts, so other people might have the same problem

 

Unless I misunderstood, the shipping cost in Weight Range is fixed for all the range.

 

Case 1: Weight Range: 10-15 kg - Price: 2 Euro.

This means that the shipping cost will be 2 Euros for any quantity between 10kg and 15kg.

 

I suppose that the code for the calculation of the shipping cost is something like:
“Lookup for the shipping cost for this weight range”

 

Case 2: I don’t know how it works in the other countries, but our carriers in Greece would charge:

-   a fixed rate for the first weight range (eg: 0 - 2 kg - 6 Euros) and

-   per kg for the rest of the quantity (eg: 2 - 50kg,  1,5 Euro per kg).

 

So a pack weighting 10kg would have a shipping cost: 6 + (10-2)*1,5 = 18 Euro

 

In this case the code for the calculation of the shipping cost would be something like this:

1. P1 = the price from the first Weight Range
2. W = the weight of the order
3. W1 = the max weight from the first Weight Range
4. W2 = Subtract W1 from W : (W-W1)
5. P2 = the price for the W2 Weight Range
6. Shipping cost = P1+ W2*P2

 

Case 3: A simplified method would be to just multiply the weight with the price of the 1 and only Weight Range

1. P = the price from the first and only Weight Range
2. W = the weight of the order
3. Shipping cost = W*P

 

My question is:

Can I modify the code so that the shipping cost is calculated according to Case 2 or Case 3?

And if so, how and where is this code?  

 

 

Edited November 10, 2013 by Nikolas Reissis (see edit history)

[Nikolas Reissis]

Partialy solved Case 3

 

Case 3: A simplified method would be to just multiply the weight with the price of the 1 and only Weight Range

1. P = the price from the first and only Weight Range
2. W = the weight of the order
3. Shipping cost = W*P

 

 

 

In Carrier.php line 250-253 I added * $total_weight. So now the Weight Range price is considered to be the per kg cost and not a fixed price. 

 

if (!isset($result['price']))
self::$price_by_weight[$cache_key] = $this->getMaxDeliveryPriceByWeight($id_zone) * $total_weight;//added  * $total_weight;
else
self::$price_by_weight[$cache_key] = $result['price'] * $total_weight;//added  * $total_weight;

 

It seems to be working. And even better it calculates the price of the correct Weight Range, so we can have as many Weight Ranges as we wish.

 

I am new to PHP so I am not sure that everything is OK. Also I don't know how to make Case 2

 

Any help?