Portuguese Meeting on Computer Graphics 2002

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https://diglib.eg.org/handle/10.2312/2633273

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Browsing Portuguese Meeting on Computer Graphics 2002 by Subject "Calligraphic Interfaces"

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    Direct Modelíng: from Sketches to 3D Models
    (The Eurographics Association, 2022) Naya, Fernando; Jorge, Joaquim A.; Conesa, Julián; Contera, Manuel; Gomis, José Maria; Xavier Pueyo; Manuel Próspero dos Santos; Luiz Velho
    ln spite of recent advances in Computer Aided Design, Graphical User Interfaces (GUJ) are, by and large, still at the stage of the so-called WIMP (Window, Icon, Menu, Pointing device) approach. ln recent years, our research team has developed different algorithms in Geometric Reconstruction. The aim of this effort is to obtain an automatic (or, at least, easy-to-use) means to generate 3D models from freehand 2D drawings. This approach serves as the basis to a calligraphic interface, based onfreehand sketches and gestures, described as a prototype application capable of modeling special kinds of objects such as normalon and quasi-normalon polyhedra. Using our system users can directly draw the axonometric view of an object to yield a 3D model. White much work remains to be done, the current application already shows gains with respect to more traditional forms ofmodeling in that it embodies a drawing approachfamiliar to most draflspeople, who can start modeling relatively complex shapes without much training. Preliminary studies show that our modeling system compares favorably to commercial grade CAD systems both in number of operations required to creating objects and time to accomplish simple modeling tasks.
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    Sketching User Interfaces with Visual Patterns
    (The Eurographics Association, 2022) Caetano, Anabela; Goulart, Neri; Fonseca, Manuel; Jorge, Joaquim; Xavier Pueyo; Manuel Próspero dos Santos; Luiz Velho
    This paper presents an approach to layout static components of user interfaces as hand-drawn compositions of simple geometric shapes, using sketch recognition and visual languages. The system uses a visual grammar built from drawings collectedfrom users. We tried to understand how people sketch interfaces and what combinations of shapes they are more likely to used when sketching widgets. From there we implemented a prototype system, for creating user interfaces through hand-drawn geometric shapes, identified by a gesture recognizer. This prototype generates a Java interface, whose layout can be beautified using an a posteriori set of grammar rufes ( e.g. to align and group objects, etc.). We have conducted usability assessments with ten users to compare our approach with a commercial system (JBuilder). Besides a measurable speed advantage in drawing interfaces, users found our system more comfortable, satisfactory and efficient to use than the commercial product, as demonstrated by post-experiment questionnaires.