Price = quantity x length x price per meter?

-- url of the page with the problem -- : localhost
-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.5
-- PHP version -- : 5.3.28
-- Browser(s) name and version -- : Chrome Версия 55.0.2883.87 m

We need to sell a certain length profiles. Specify a price per meter, and the choice of the length that the price remained the same (per square meter), and the factor has changed and applied to the final price.
For example, on the product page: the price per square meter € 1, option: The length of 2.5 meters.
In order: 1 Profile of length 2.5 meters of 2.5 €.
price = quantity x length x price per meter
Is that possible?

Thank You

Can't find price override plugin. It is not the same as HikaShop Custom Quantity plugin, right?
The problem is that the price does not change depending on the length value.

Hi, Jerome!

custom_quantity_width_length.php :

<?php
jimport('joomla.plugin.plugin');
class plgSystemCustom_quantity_width_length extends JPlugin{
}

if(!function_exists('hikashop_product_price_for_quantity_in_cart') && !function_exists('hikashop_product_price_for_quantity_in_order')) {
function hikashop_product_price_for_quantity_in_cart(&$product){
$currencyClass = hikashop_get('class.currency');
$quantity = @$product->cart_product_quantity;
if(!empty($product->length)){
$quantity = $quantity*$product->length;
}
$currencyClass->quantityPrices($product->prices,$quantity,$product->cart_product_total_quantity);
}

function hikashop_product_price_for_quantity_in_order(&$product){
$quantity = $product->order_product_quantity;
if(!empty($product->length)){
$quantity = $quantity*$product->length;
}
$product->order_product_total_price_no_vat = $product->order_product_price*$quantity;
$product->order_product_total_price = ($product->order_product_price+$product->order_product_tax)*$quantity;
}

Thank you very much for your time, and I went to learn English

Is it possible to output full lenght in checkout cart?

I tried to change the code in checkout / cart.php, but nothing good came of it.
I have successfully created a new column but still could not change value to quantity*length.
Do I need to create new class "hikashop_cart_product_full_length"?
I take the length from custom_quantity_width_length.php (HikaShopCustom Quantity plugin).

Hi again.
I'm sorry that wasting your time, but I did not reach any success with this problem.
I can't find $this->row->cart_product_quantity and $this->row->length In checkout/cart.php (txt in the attachment).
Still need to output length*quantity value before CART_PRODUCT_UNIT_PRICE.
I not quite understand the code, but understand that I need copy-paste and customize these fragments:

<td data-title="<?php echo JText::_('CART_PRODUCT_UNIT_PRICE'); ?>" class="hikashop_cart_product_price_value">
								<?php
									$this->row =& $row;
									$this->unit = true;
									echo $this->loadTemplate();
								?>
								<?php if(HIKASHOP_RESPONSIVE){ ?><span class="visible-phone"><?php echo JText::_('PER_UNIT'); ?></span><?php } ?>
							</td>

<th id="hikashop_cart_product_price_title" class="hikashop_cart_product_price_title hikashop_cart_title">
						<?php echo JText::_('CART_PRODUCT_UNIT_PRICE'); ?>

Thank you very much!
I used this modification:

<th id="hikashop_cart_product_price_title" class="hikashop_cart_product_price_title hikashop_cart_title">
						<?php echo JText::_('CART_PRODUCT_FULL_LENGTH'); ?>
                    </th>

<td data-title="<?php echo JText::_('CART_PRODUCT_UNIT_PRICE'); ?>" class="hikashop_cart_product_price_value">
								<?php
									$this->row =& $row;
									$this->unit = true;
if(empty($this->row->length))
if(empty($this->row->length100))
if(empty($this->row->length25))
echo "<div style='text-align:right'>".'';
else
echo "<div style='text-align:right'>" .$this->row->cart_product_quantity * $this->row->length25,'m';
else 
echo "<div style='text-align:right'>" .$this->row->cart_product_quantity * $this->row->length100,'m';
else
echo "<div style='text-align:right'>" .$this->row->cart_product_quantity * $this->row->length,'m';
								?>
								<?php if(HIKASHOP_RESPONSIVE){ ?><span class="visible-phone"><?php echo JText::_('PER_UNIT'); ?></span><?php } ?>
							</td>