We are looking for somebody who can make a (custom field) plugin for Virtuemart 2.0.x. The plugin must make a calculation based on the values of one or two fields and using a matrix. No hacking of core code!
The webshop sells all kinds of sunshade products. Some have fixed sizes, but some products are custommade and therefore a visitor must fill in a width in centimeters and sometimes also a height. The values they fill in will be rounded up and a price is determined by using a matrix . The plugin will be used as a cart attribute so the totalprice in the cart will be modified immediately. It is also necessary that a minimum and maximum width or height can be set, so if a value is not correct a warning must popup and nothing is added to the cart. Please see the attachment for examples.