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Peter Moulder


Publications by Peter Moulder (bibliography)

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Braganza, Cameron, Marriott, Kim, Moulder, Peter, Wybrow, Michael and Dwyer, Tim (2009): Scrolling behaviour with single- and multi-column layout. In: Proceedings of the 2009 International Conference on the World Wide Web 2009. pp. 831-840. http://doi.acm.org/10.1145/1526709.1526821

The standard layout model used by web browsers is to lay text out in a vertical scroll using a single column. The horizontal-scroll layout model -- in which text is laid out in columns whose height is set to that of the browser window and the viewer scrolls horizontally -- seems well-suited to multi-column layout on electronic devices. We describe a study that examines how people read and, in particular, the strategies they use for scrolling with these two models when reading large textual documents on a standard computer monitor. We compare usability of the models and evaluate both user preferences and the effect of the model on performance. Also interesting is the description of the browser and its user interface which we used for the study.

© All rights reserved Braganza et al. and/or ACM Press

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Hurst, Nathan, Marriott, Kim and Moulder, Peter (2002): Dynamic approximation of complex graphical constraints by linear constraints. In: Beaudouin-Lafon, Michel (ed.) Proceedings of the 15th annual ACM symposium on User interface software and technology October 27-30, 2002, Paris, France. pp. 191-200. http://doi.acm.org/10.1145/571985.572012

Current constraint solving techniques for interactive graphical applications cannot satisfactorily handle constraints such as non-overlap, or containment within non-convex shapes or shapes with smooth edges. We present a generic new technique for efficiently handling such kinds of constraints based on trust regions and linear arithmetic constraint solving. Our approach is to model these more complex constraints by a dynamically changing conjunction of linear constraints. At each stage, these give a local approximation to the complex constraints. During direct manipulation, linear constraints in the current local approximation can become active indicating that the current solution is on the boundary of the trust region for the approximation. The associated complex constraint is notified and it may choose to modify the current linear approximation. Empirical evaluation demonstrates that it is possible to (re-)solve systems of linear constraints that are dynamically approximating complex constraints such as non-overlap sufficiently quickly to support direct manipulation in interactive graphical applications.

© All rights reserved Hurst et al. and/or ACM Press

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