GUI: Added simple function for efficiently collect point coordinates by clicking in the image

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

zUtil_GUI/gtGuiCollectPointsFromImage.m

+function points = gtGuiCollectPointsFromImage(map)
+    f = figure();
+    ax = axes('parent', f);
+    map = (map - min(map(:))) ./ (max(map(:)) - min(map(:)));
+    im = imagesc(map, 'parent', ax);
+
+    cm = uicontextmenu('Parent', f, 'Callback', @(src, evt)save_clicked_point());
+    set(im, 'UIContextMenu', cm);
+    uimenu(cm, 'Label', 'Add point..', 'Callback', @(src, evt)add_current_point());
+    uimenu(cm, 'Label', 'Exit', 'Callback', @(src, evt)get_finally_out());
+
+    point = zeros(1, 2);
+
+    points = zeros(0, 2);
+
+    get_out = false;
+
+    while(~get_out)
+        pause(0.001);
+    end
+
+    close(f);
+
+    function save_clicked_point()
+        point = get(ax, 'CurrentPoint');
+        point = round(point(1, 1:2));
+    end
+
+    function add_current_point()
+        points(end+1, :) = point;
+    end
+
+    function get_finally_out()
+        get_out = true;
+    end
+end