added agent position trail to plot

@miSim/plotTrails.m

@@ -0,0 +1,31 @@
+function obj = plotTrails(obj)
+    arguments (Input)
+        obj (1, 1) {mustBeA(obj, 'miSim')}
+    end
+    arguments (Output)
+        obj (1, 1) {mustBeA(obj, 'miSim')}
+    end
+    
+    % fast exit when plotting is disabled
+    if ~obj.makePlots
+        return;
+    end
+
+    % Plot full range of position history on each spatial plot axes
+    o = [];
+    for ii = 1:(size(obj.posHist, 1))
+        hold(obj.f.Children(1).Children(obj.spatialPlotIndices(1)), 'on');
+        o = [o; plot3(obj.f.Children(1).Children(obj.spatialPlotIndices(1)), obj.posHist(ii, 1:obj.maxIter, 1), obj.posHist(ii, 1:obj.maxIter, 2), obj.posHist(ii, 1:obj.maxIter, 3), 'Color', 'k', 'LineWidth', 1)];
+        hold(obj.f.Children(1).Children(obj.spatialPlotIndices(1)), 'off');
+    end
+
+    % Copy trails to other figures?
+    obj.trailPlot = o;
+
+    % Add legend?
+    % TODO legend?
+    % TODO unique colors for agent trails (same as performance plot?)
+    % Could be agent-specific colors (stored as agent property)
+    keyboard
+
+end