Freehand drawing in axes

4 次查看（过去 30 天）
dan kin
dan kin 2013-5-12
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.

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回答（1 个）

Image Analyst
Image Analyst 2013-5-12
Try commenting out this line:
fig = figure('DoubleBuffer','on','back','off');
  2 个评论
dan kin
dan kin 2013-5-13
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
Image Analyst 2013-5-13
编辑：Image Analyst 2013-5-13
Try this: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/ to see where the additional figure pops to life.

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