Daniel@0: classdef Circlelayout < Abstractlayout
Daniel@0: % A simple layout which places node onto a scaled unit circle. 
Daniel@0: %
Daniel@0: % Matthew Dunham
Daniel@0: % University of British Columbia 
Daniel@0:      properties
Daniel@0:         xmin;               % The left most point on the graph axis in data units           
Daniel@0:         xmax;               % The right most point on the graph axis in data units
Daniel@0:         ymin;               % The bottom most point on the graph axis in data units
Daniel@0:         ymax;               % The top most point on the graph axis in data units
Daniel@0:         adjMatrix;          % The adjacency matrix
Daniel@0:         maxNodeSize;        % The maximum diameter of a node in data units
Daniel@0:         image;              % An image for the button that will lanuch this layout
Daniel@0:         name;               % A unique name for instances of this class
Daniel@0:         shortDescription;   % A description for use in the tooltips
Daniel@0:         nodeSize;           % The calculated node size, call dolayout() before accessing
Daniel@0:         centers;            % The calculated node centers in an n-by-2 matrix
Daniel@0:      end
Daniel@0:     
Daniel@0:      methods     
Daniel@0:          function obj = Circlelayout(name)
Daniel@0:          % constructor
Daniel@0:             if(nargin < 1)
Daniel@0:                 obj.name = 'circlelayout';
Daniel@0:             else
Daniel@0:                 obj.name = name;
Daniel@0:             end
Daniel@0:             load glicons;
Daniel@0:             obj.image = icons.circle;
Daniel@0:             obj.shortDescription = 'Simple Circle Layout'; 
Daniel@0:          end
Daniel@0:      end
Daniel@0:      
Daniel@0:      methods(Access = 'protected')
Daniel@0:        
Daniel@0:         function calcLayout(obj)
Daniel@0:             nnodes = size(obj.adjMatrix,1);
Daniel@0:             step = 2*pi/(nnodes);
Daniel@0:             t = 0:step:2*pi;
Daniel@0:             x = 0.4*sin(t)+0.5;
Daniel@0:             y = 0.4*cos(t)+0.5;
Daniel@0:            
Daniel@0:             x = obj.xmin + x ./ (obj.xmax - obj.xmin);
Daniel@0:             y = obj.ymin + y ./ (obj.ymax - obj.ymin);
Daniel@0:             obj.centers = [x',y'];
Daniel@0:             d = sqrt((x(2)- x(1))^2 + (y(2) - y(1))^2);
Daniel@0:             obj.nodeSize = min(2*d/3,obj.maxNodeSize);
Daniel@0:         end
Daniel@0:     
Daniel@0:      end
Daniel@0:     
Daniel@0:     
Daniel@0:     
Daniel@0: end