Vol.56 No (Mar. 2015) Canvas SVG HTML Web Viewport Library UML Canvas SVG 1,000 HTML SVG Viewport Library Viewport Library HTML HTML Web H

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1 Vol.56 No (Mar. 2015) Web 1,a) 1,b) , HTML5 Web HTML5 HTML Canvas SVG HTML Canvas SVG Web Viewport Library Viewport Library HTML SVG Viewport Library Viewport Library AssureNote AssureNote Viewport Library PC Web 10,000 HTML5 SVG Fast Rendering Method for Visual Model on Web Browser Tetsuro Matsumura 1,a) Kimio Kuramitsu 1,b) Received: June 30, 2014, Accepted: October 8, 2014 Abstract: The emergence of HTML5 enabled to develop rich internet application. The Canvas element and the SVG element are parts of HTML5 and allow us for rendering dynamic 2D shapes. However, both elements cannot render HTML document in the shapes. Therefore Canvas elements and SVG elements cannot be directly used to render the visual models such as diagrams including text and shapes. In this paper, we introduce Viewport Library: a framework that enables fast rendering of large visual model on Web browsers. Rendering of out-of-screen parts of the visual model is optimized. Viewport Library also enables to scale and scroll visual models. We developed a visual model editor AssureNote with the framework and demonstrated that a visual model contains 10,000 nodes is smoothly processed on a typical PC. Keywords: Web Application, Visual modeling, HTML5, SVG 1. HTML5.0 [1] Flash Java Applet Web 1 Yokohama National Uniersity, Yokohama, Kanagawa , Japan a) matsumura-tetsuro-jk@ynu.jp b) kkuramitsu@gmail.com Google Document *1 Office 365 *2 Gmail *3 HTML5 HTML Canvas [2] SVG Scalable Vector Graphics [3] Canvas SVG XML *1 *2 *3 c 2015 Information Processing Society of Japan 1039

2 Vol.56 No (Mar. 2015) Canvas SVG HTML Web Viewport Library UML Canvas SVG 1,000 HTML SVG Viewport Library Viewport Library HTML HTML Web HTML HTML SVG Viewport Library Viewport Library HTML SVG Viewport Library AssureNote AssureNote GSN Goal Structuring Notation AssureNote 10,000 1, Web 5 6 Viewport Library 7 AssureNote 8 2. Web Cacoo [4] Web Web Flash Flash Viewport Library Web Viewport Library SVG Graphviz [5] dot Web JavaScript [6] SVG D3.js [7] Web SVG Viewport Library HTML Visual model UML Unified Modeling Language [8] 1 2 (a) wrapping (b) 1 Fig. 1 An example of the visual model. c 2015 Information Processing Society of Japan 1040

3 Vol.56 No (Mar. 2015) Fig. 2 2 The difference between with and without text wrapping Web (1) (2) (3) (4) (5) Firefox Chrome HTML5 Internet Explorer Viewport Library SVG 4.1 HTML HTML img HTML JavaScript HTML Web Flash Java Applet HTML Web Web HTML HTML5 JavaScript HTML Canvas SVG 4.2 Canvas Canvas 2 HTML Canvas DOM Document Object Model HTML Canvas API JavaScript Canvas c 2015 Information Processing Society of Japan 1041

4 Vol.56 No (Mar. 2015) 1 Web Table 1 Drawing techniques available in Web application. var canvas = document.createelement("canvas"); document.body.appendchild(canvas); var ctx = canvas.getcontext("2d"); ctx.strokestyle = "black"; ctx.fillstyle = "white"; ctx.beginpath(); ctx.moveto(10, 10); ctx.lineto(90, 10); ctx.lineto(90, 90); ctx.lineto(10, 90); ctx.closepath(); ctx.stroke(); Canvas Canvas 4.3 SVG SVG SVG 2 SVG XML HTML DOM SVG Canvas var ns = " var svg = document.createelementns(ns, "svg"); document.body.appendchild(svg); var rect = document.createelementns(ns, "rect"); rect.setattribute("x", "10"); rect.setattribute("y", "10"); rect.setattribute("width", "80"); rect.setattribute("height", "80"); rect.setattribute("stroke", "black"); rect.setattribute("fill", "white"); svg.appendchild(rect); SVG Illustrator Inkscape Illsutrator SVG SVG Web DOM Web DOM DOM DOM Web (1) SVG 1 Canvas HTML c 2015 Information Processing Society of Japan 1042

5 Vol.56 No (Mar. 2015) (2) Cascading Style Sheets, CSS [9] SVG HTML Canvas (3) HTML transform SVG transform 1 Canvas (4) HTML Canvas SVG 1 (5) HTML SVG Canvas HTML 1 DOM Canvas (6) SVG Canvas HTML Canvas SVG 1 3 Canvas API Transform Canvas HTML 5 HTML 5. Viewport Library Viewport Library SVG HTML 5.1 Viewport Library SVG HTML 3 Viewport Library Fig. 3 The visual model drawn with Viewport Library. HTML DOM CSS HTML SVG Viewport Library SVG HTML 2 2 Viewport Library Viewport Library CSS 3 Viewport Library HTML SVG Viewport Library 2 SVG HTML DOM 4 2 HTML SVG Viewport Library DOM Viewport 1 DOM NodeView NodeView UML c 2015 Information Processing Society of Japan 1043

6 Vol.56 No (Mar. 2015) r p = c p + s(r m c m ) (1) r m = c m + 1 s (r p c p ) (2) 4 Fig. 4 Markup for the layer structure. 5.4 DOM 4.3 SVG HTML DOM DOM DOM DOM 1 DOM DOM DOM HTML SVG DOM Viewport Library DOM NodeView DOM 6. 5 Viewport Library Fig. 5 Structure of Viewport Library. 5.3 Viewport Library Web Web Viewport Library c m =(c mx,c my ) c p =(c px,c py ) s r m =(x m,y m ) r p =(x p,y p ) Viewport Library 6.1 (1) (2) HTML SVG (3) DOM (4) HTML SVG (5) 6.2 NodeView HTML SVG HTML CSS position absolute left top SVG transform translate HTML SVG c 2015 Information Processing Society of Japan 1044

7 Vol.56 No (Mar. 2015) <div class="htmlelement" style=" position: absolute; left: -116px; top: 316px; "> <g class="svgelement" transform="translate( )"> Viewport transform 6.3 Viewport 2 Viewport DOM CSS transform SVG transform 5.3 (1) transform translate(c px c py) scale(s) translate( c mx c my) transform transform 6.4 Web SVG HTML JavaScript API 1 HTML getboundingclientrect var div = document.createelement("div"); div.textcontent = "Hello, world"; // 1 document.body.appendchild(div); // var rect = div.getboundingclientrect(); 1 HTML SVG DOM NodeView HTML SVG 6.7 NodeView NodeView 6 Not Rendered 6.5 Not Rendered 6.1 Visible (a) 6.6 Not Rendered HTML SVG Invisible (b) 5.4 c 2015 Information Processing Society of Japan 1045

8 Vol.56 No (Mar. 2015) Fig. 6 6 NodeView State transition diagram of the NodeView. Fig. 7 7 Rendering time between with and without the folding. Invisible Visible (c d) 6.8 Viewport Library SVG HTML NodeView HTML SVG Viewport Library ,276 5,705 11, GHz Intel Core i7 8GB RAM Intel HD Graphics 5000 PC OS X Google Chrome AssureNote ms Fig. 8 Rendering time between with and without background node-size calculation Viewport Library Web GSN Goal Structuring Notation [10] AssureNote 9 *4 GSN AssureNote 10 GSN Not Rendered 6.7 Visible AssureNote GSN Viewport Library *4 c 2015 Information Processing Society of Japan 1046

9 Vol.56 No (Mar. 2015) 11 Fig. 11 Drawing time for the visual model. 9 Fig. 9 AssureNote AssureNote ,415 GSN AssureNote D-Case Weaver 1, AssureNote Fig. 10 Subtree folding on AssureNote. GSN Viewport Library AssureNote Web GSN D-Case Weaver [11] D-Case Weaver GSN Canvas GSN D-Case Weaver 4.4 AssureNote Viewport Library HTML 7.1 AssureNote Web Viewport Library Viewport Library SVG HTML Web DOM JST/CREST SecurityWeaver P-SCRIPT [1] W3C: HTML5, W3C (online), available from (accessed ). [2] W3C: HTML Canvas 2D Context, W3C (online), available from 2dcontext / (accessed ). [3] W3C: Scalable Vector Graphics (SVG) 1.1 (Second Edition), W3C (online), available from w3.org/tr/svg11/ (accessed ). [4] Nulab: Cacoo: Online Diagram Software for Flow Chart and UML and More, Nulab (online), available from (accessed ). [5] Graphviz: Graphviz - Graph Visualization Software, Graphviz project (online), available from graphviz.org/ (accessed ). [6] Daines, M.: viz.js, viz.js (online), available from (accessed ). c 2015 Information Processing Society of Japan 1047

10 Vol.56 No (Mar. 2015) [7] Bostock, M.: Data-Driven Documents, Data-Driven Documents (online), available from (accessed ). [8] Gil, J., Howse, J. and Kent, S.: Advanced Visual Modeling (Tutorial Session): Beyond UML, Proc. 22nd International Conference on Software Engineering, p.833 (online), DOI: / (2000). [9] W3C: Cascading Style Sheets (CSS) Snapshot 2010, W3C (online), available from CSS/ (accessed ). [10] Kelly, T. and Weaver, R.: The goal structuring notation A safety argument notation, Proc. Dependable Systems and Networks 2004 Workshop on Assurance Cases (2004). [11] DEOS: D-Case Weaver, DEOS (online), available from DCaseWeaver/index.html (accessed ) Konoha 20 ACM c 2015 Information Processing Society of Japan 1048

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