Freehand drawing in axes

Dear All,

I want to draw multiply lines (freehand) in one axes (e.g., paintAxes) which is one of many axes in a GUI.

I tried the solution provided by Doug Schwarz in http://www.mathworks.in/matlabcentral/newsreader/view_thread/30168#75552

The code is:

function sketch(cmd)
    if nargin == 0
        cmd = 'init';
    end
  switch cmd
  case 'init'
      fig = figure('DoubleBuffer','on','back','off');
      info.ax = axes('XLim',[0 1],'YLim',[0 1]);
      info.drawing = [];
      info.x = [];
      info.y = [];
      set(fig,'UserData',info,...
              'WindowButtonDownFcn',[mfilename,' down'])
  case 'down'
      myname = mfilename;
      fig = gcbf;
      info = get(fig,'UserData');
      curpos = get(info.ax,'CurrentPoint');
      info.x = curpos(1,1);
      info.y = curpos(1,2);
      info.drawing = line(info.x,info.y,'Color','k');
      set(fig,'UserData',info,...
              'WindowButtonMotionFcn',[myname,' move'],...
              'WindowButtonUpFcn',[myname,' up'])
  case 'move'
      fig = gcbf;
      info = get(fig,'UserData');
      curpos = get(info.ax,'CurrentPoint');
      info.x = [info.x;curpos(1,1)];
      info.y = [info.y;curpos(1,2)];
      set(info.drawing,'XData',info.x,'YData',info.y)
      set(fig,'UserData',info)
  case 'up'
      fig = gcbf;
      set(fig,'WindowButtonMotionFcn','',...
              'WindowButtonUpFcn','')
  end

I still have few problems which I would be grateful if you can help:

- when I call it opens a new figure, how can I disable it and how I can make it to allow drawing only in my specific axes?

-How can I change the line thickness?

Thanks a lot in advance.

Answer 1

[Image Analyst]

Try commenting out this line:

fig = figure('DoubleBuffer','on','back','off');

[dan kin]

I tried the comment option and it does not work. I still get a big axes which overlaps the other axes in the GUI.

It seems that line 13-14 in the sketch is also an error:

set(fig,'UserData',info,...
            'WindowButtonDownFcn',[mfilename,' down'])

Any idea how to solve it?

Thanks

[Image Analyst]

Try this: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/ to see where the additional figure pops to life.