UserManual:Introduction/fr

Introduction
Actuellement, les projets open source sont utilisé avec succès dans différents domaines technologique. Ils ont prouvé leurs capacité à et efficacité à solutionner des problèmes complexes.Certains projets open sources sont clairement des leaders dans leur domaine. D'autres projets completé avec des solution propriétaire et, a travers la compétition, ont amélioré la qualité des solutions logicielles disponibles dans leur domaine. Des exemples de projets open source réussis incluent les navigateurs, les systèmes d'exploitation, les suites bureautiques, les éditeurs graphiques et les serveurs Web.

Si vous connaissez l'historique du système d'exploitation GNU / Linux, vous pouvez comprendre ce qui a incité ses auteurs à créer un nouveau système d'exploitation. La prolifération de logiciels propriétaires a créé un nouveau problème pour les utilisateurs. Dans la poursuite du profit et pour protéger leur propriété intellectuelle, les entreprises de logiciels ont commencé à imposer des restrictions toujours plus importantes aux droits des utilisateurs. Beaucoup de gens n'ont pas approuvé cette situation et ont décidé de contester ces impositions. Leur solution était d'offrir un logiciel gratuit et extensible par tout le monde.

Des histoires similaires peuvent être trouvées dans presque tous les domaines de la technologie. Au fil du temps, la situation s'est améliorée pour les systèmes d'exploitation et maintenant, nous pouvons choisir parmi plusieurs offres gratuites. Pas tellement dans l'industrie du vêtement. Il existe de nombreuses solutions, de bonnes solutions, mais elles ne sont pas disponibles pour la personne commune. Même les petites entreprises ne peuvent pas se permettre les solutions existantes. Pour nous, cela ressemble au moyen âge. Le manque de solutions abordables nous a incité à créer ce projet.

The goal of our project is to develop a program for creating sewing patterns that is available for free to all who wish to use it. We believe that a small group of people with a common interest can achieve this goal.

What is Valentina?
Valentina is a cross-platform patternmaking program which allows designers to create and model patterns of clothing. This software allows pattern creation using either standard sizing tables or an individual’s set of measurements. It blends new technologies with traditional methods to create a unique pattern making tool.

Currently, there is a lack of affordable software tools designed for creating patterns. Some people faced with this problem resort to using CAD tools or graphical editors designed for other purposes. However, these tools are inadequate when performing certain pattern making tasks (e.g. adding seam allowance, truing a dart, walking a seam). Moreover, these programs are good enough to create a pattern in a single size, but when you want to make changes for another person, you can't do it quickly. You need to create the pattern from scratch. This is where traditional methods of pattern drafting can be very useful. Why can't you tell a program how to change the pattern so you don't need to do it ever again?

Why use the traditional method?
Pattern drafting is a system of pattern making where the lengths and positions of the pattern lines are calculated using mathematical formulas. These formulas depend on a set of body measurements either from a standard figure or from an individual's measurements. The better the formula, the better the fit of the resulting garment. Unfortunately, devising formulas to make 2D cloth fit a 3D figure is not easy. Therefore, formulas are typically used to create only the most basic patterns, known as "slopers".

Contemporary pattern makers rarely use drafting methods because they find it inefficient to start patterns from scratch. Instead, they use existing patterns, called "blocks", as a starting point to create new styles. They modify the blocks using flat pattern making techniques. These techniques consist of cutting the pattern and manipulating the pieces to relocate darts, add fullness or shape the pattern to fit the hollows of the human body (i.e. contouring). A pattern created with these techniques still fits the standard figure or the individual's body for which the original block was created. However, compared to a pattern created with formulas, this pattern does not adjust as easily to a different set of measurements.

The advantage of recreating pattern drafting techniques in software is that the resulting formula-based patterns can be automatically custom-fitted to an individual's measurements. However, in order to create patterns that are more complex than the traditional sloper, it is necessary to translate the flat pattern manipulations into formulas as well. We believe that, using a bit of ingenuity and computing power, we can accomplish this task.

Why is it important to make the pattern fit an individual's measurements? Because the standard sizes used in industrial production and home sewing patterns are inadequate for a large part of the population. Women, in particular, deviate greatly from the standard figure. In America, for example, only 8 percent of women posses the hourglass figure that has long determined the proportions of clothing. It is no wonder that so many clothes go unsold each year, even after multiple discounts, ending up in landfills.

Recently there has been an increase in demand for made-to-measure clothing and re-defined standard measurements within the 'slow fashion' and 'eco fashion' movements. Tools optimized for made-to-measure clothing and special sizes are needed to meet this demand. These tools can be used in the effort to promote local and regionally based garment manufacturing, small batch textile manufacturing, 'slow fashion', and 'eco fashion'. We hope Valentina helps people all over the world promote local and slow manufacturing of clothing.

How about new technologies?
When people hear about Valentina some of them think it is a program like Blender or a 3D pattern making application. They ask questions like the following: And so on. See more FAQ.
 * Why not use 3D?
 * Why not create a plugin for Blender?

The answer to all these questions is quite simple: pattern making in 2D is easy to implement. On the other hand, creating a 3D pattern making program can be very difficult and expensive. Before you begin to develop software you need to know the limits of your development team. We think that starting development of Valentina in 2D is the best choice for the size and skill level of our team at this moment.

One of the bad things about using the traditional methods is that you must have a good imagination. Especially when you have a complex pattern. This is where 3D can help. This is why we plan to use a 3D mannequin in the future. A good 3D model could save us time and money.