placing figure in current GUI in a particular location

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Raady 2016-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/265098-placing-figure-in-current-gui-in-a-particular-location

评论： Raady 2016-1-25

I created an gui and named it as maingui i have a pushbutton, and in the call back function using uigetfile I browse the location of a video. Then in the same callbackfunction I call a function which reads the video and extract a frame from video, but I want to display the extracted frame on that GUI , how can I do that ?

function fntest_final()
     MW.f        = figure('Name','Project','Position', [1 1 700 1000]);
     setappdata(0,'maingui',gcf);
     MW.pb2      = uicontrol('Style', 'Pushbutton'.....
     ....
     set(MW.pb2,  'Callback', {@loadbutton,MW});
end
 function loadbutton(varargin)
      MW = varargin{3};
      reqfilename  = uigetfile(....)
      readvideofn  %%i get error in navigating to this function
 end
 function readvideofn(reqfilename)
    videoObject = VideoReader(reqfilename);
    rgbImage = read(videoObject, 3200);
   %%now I want to display this on the GUI in a particular fixed position
   %%how ?
 end

when I call the function it says Error while evaluating UIControl Callback

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Answer 1

Walter Roberson 2016-1-25

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image() accepts x and y coordinates to display at. But I suspect that what you want is to generate an axes ahead of time, retrieve the axes handle in the routine, and pass the axes handle to image() as the first parameter.

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Walter Roberson 2016-1-25

在 MATLAB Online 中打开

At the top when you are creating MW, create MW.video_axes as the axes configured with the Position where you want the frame to be displayed.

 function loadbutton(varargin)
      MW = varargin{3};
      [reqfilename, reqpath]  = uigetfile(....);
      thisfile = fullfile(reqpath, reqfilename);
      readvideofn(thisfile, MW);
 end
 function readvideofn(reqfilename, MW)
    videoObject = VideoReader(reqfilename);
    rgbImage = [];
    for K = 1 : 3200
      if hasFrame(videoObject)
        rgbImage = readFrame(videoObject);
      else
        break;
      end
    end
    delete(videoObject);
    dest_axes = MW.video_axes;
    image(dest_axes, rgbImage);
    axes(dest_axes, 'image');
 end

You might notice that I replaced the read() with a loop. The read() method is deprecated and the replacement readFrame does not allow frames to be requested by number. I do not know why that is, but I suspect it might have to do with variable frame-rate videos.

Raady 2016-1-25