comparison toolboxes/graph_visualisation/graphViz4Matlab/layouts/Circlelayout.m @ 0:e9a9cd732c1e tip

first hg version after svn

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