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