1. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 Software Evolution Visualization Lucian Voinea

2. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 Why Software Evolution Visualization ? Software understanding - what is the structure of the project ? - what is important ? - what is difficult ? - who work on it ? - what parts are connected to a given part ? - what parts refer to a given aspect ? Product and process assessment - what is the process ? - what is the core team ? - where is the activity concentrated ? - what is stable ?

3. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 Challenges Data acquisition - data source  SW Configuration Management - long acquisition times - large storage space, large bandwidth - data parsing & maintenance Data analysis - Enrich recorded evolution data E.g. evolution similarity metrics Data visualization - multivariate : 10s attributes (Demo 6 attributes) - large data amount : 100s files,10s versions, 1000s lines VTK – 2700 files x 100 versions ArgoUML – 4452 files x 80 versions SW Configuration Management ≠ SW evolution mining

4. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 version control management system data extraction CVS Project evolution visualization File evolution visualization CVSscan CVSgrab SW Evolution Visualization Toolset

5. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 CVSgrab V1V1 V2V2 V3V3 F2F2 F3F3 F4F4 Time F1F1 Files Color - encodes a file metric computed on a given version E.g. File type, Version author, Size increase, Release ID, Specific text, Activity Vertical layout – given by a sort criteria E.g. Creation time, Folder, Activity, Similarity Metric views System evolution at time t i Evolution of file F i

6. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 Time Files CVSgrab Example Color encodes version author Horizontal metric : Release ID Vertical metric : similarity Different Similar

7. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 CVSscan if self.bShowClusterColor: glBlendFunc(GL_ONE_MINUS_... glEnable(GL_BLEND) yPos = 0 bSwitch = True for i in lCushionMap: if bSwitch: cushions.drawColorCl.. else: cushions.drawColorClus… bSwitch = not bSwitch yPos = yPos + i glDisable(GL_BLEND) #cushion clusters glBlendFunc(GL_ZERO,GL_... glEnable(GL_BLEND) yPos = 0 bSwitch = True Time v1v1 v2v2 v3v3 v4v4 v5v5 Color - encodes a line metric

8. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 Line layout CVSscan

9. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 CVSscan Example Color encodes content Color encodes authors

10. www.win.tue.nl/~lvoinea/VCN.htmlEindhoven, 03.02.2006 Conclusions www.win.tue.nl/~lvoinea/VCN.html Toolset for visualization of software evolution : CVSgrab & CVSscan Exploit source code history from CVS as main source for getting insight in the structure and development process Complements existing reverse engineering and code navigation tools Outlook: Improve the data analysis step, find mechanisms for annotation management, improve selection mechanisms, enhance the visualization with new features, extend the data acquisition sources and types…