Browsing by Subject "Layout (Printing)"
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Item Open Access Chisio : a visual framework for compound graph editing and layout(Bilkent University, 2007) Küçükkeçeci, CihanGraphs are data models, widely used in many areas from networking to biology to computer science. Visualization, interactive editing ability and layout of graphs are critical issues when analyzing the underlying relational information. There are many commercial and non-commercial graph visualization tools. However, overall support for compound or hierarchically organized graph representations is very limited. We introduce a new open-source editing and layout framework named Chisio for compound graphs. Chisio is developed as a free, easy-to-use and powerful academic graph visualization tool, supporting various automatic layout algorithms. It is written in Java and based on Eclipse’s Graphical Editing Framework (GEF). Chisio can be used as a finished generic compound graph editor with standard graph editing facilities such as zoom, scroll, add or remove graph objects, move, and resize. Object property and layout options dialogs are provided to modify existing graph object properties and layout options, respectively. In addition, printing or saving the current drawing as a static image and persistent storage facilities are supported. Saved graphs or GraphML formatted files created by other tools can be loaded into Chisio. Furthermore, a highlight mechanism is provided to emphasize subgraphs of users interest. The framework has an architecture suitable for easy customization of the tool for end-users’ specific needs as well. Also Chisio offers several layout styles from the basic spring embedder to hierarchical layout to compound spring embedder to circular layout. Furthermore, new algorithms are straightforward to add, making Chisio an ideal test environment for layout algorithm developers.Item Open Access Chisio Web : a web-based framework for customizable visualization of relational information(Bilkent University, 2012) Sümer, Selçuk OnurGraphs are widely used to represent complex relational information. Graph visualization is crucial for effective analysis of information. In simple graphs, nodes are generally considered as uniform-sized components and they cannot be nested. This is often not sufficient to visualize complex relationships, because relational information is often clustered or hierarchically organized into groups or nested structures. There exist many free, open source software in the field of web-based graph visualization. However, none fully supports compound or clustered graphs. Moreover, customization provided by such software is often limited to the basic visual properties of nodes and edges. It requires a lot of effort to build an advanced customization of visual properties and interactive functionality with these software. In this thesis, we introduce a free, open source, general-purpose, web-based graph visualization framework, named Chisio Web (ChiWeb). ChiWeb supports visualization, interactive editing and layout of both simple and compound graphs. ChiWeb is implemented in ActionScript language and based on Flare, which is an open source ActionScript library designed for data visualization. ChiWeb is specifically designed for easy customization with respect to visualization and functionality. ChiWeb can be used as a library to create a custom graph visualization with an advanced application behavior for particular needs of a specific domain. The elements and functionality that can be easily customized with ChiWeb are: visual styles, controls for interactive events such as node creation, key and mouse functionality, context menus, toolbars, and inspector windows. Furthermore, ChiWeb’s architecture allows easy integration of new graph layout algorithms.Item Open Access A circular layout algorithm for clustered graphs(Bilkent University, 2009) Belviranlı, Mehmet EsatVisualization of information is essential for comprehension and analysis of the acquired data in any field of study. Graph layout is an important problem in information visualization and plays a crucial role in the drawing of graph-based data. There are many styles and ways to draw a graph depending on the type of the data. Clustered graph visualization is one popular aspect of the graph layout problem and there have been many studies on it. However, only a few of them focus on using circular layout to represent clusters. We present a new, elegant algorithm for layout of clustered graphs using a circular style. The algorithm is based on traditional force-directed layout scheme and uses circles to draw each cluster in the graph. In addition it can handle non-uniform node dimensions. It is the first algorithm to properly address layout of the quotient graph while considering inter-cluster relations as well as intra-cluster edge crossings. Experimental results show that the execution time and quality of the produced drawings with respect to commonly accepted layout criteria are quite satisfactory. The algorithm has been successfully implemented as part of Chisio, version 1.1. Chisio is an open source general purpose graph editor developed by i-Vis (information visualization) Research Group of Bilkent University.