I want to put a slider in GUI to zoom into my image with certain center

Question

Jahandar Jahanipour 2016-5-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/284272-i-want-to-put-a-slider-in-gui-to-zoom-into-my-image-with-certain-center

评论： Jahandar Jahanipour 2016-5-16

Hi. I have written a GUI without using GUIDE. I have an image (in Image matrix) with 2 pushbuttons in it. I have several points (in point matrix) that I want to ask the user to choose the proper type of that point. I have two questions.

1. specifying the point by a marker in the image, I want a slider so that the user can zoom into the picture with that point in the center of the picture.

2. after pushing the pushbutton, I want the marker to go to the next point and ask the user about the new point. Obviously, I need a for loop to change the points, but I am not sure where to use it, in my main script or in the gui script.

I read the image from my workspace, and I have the coordinates of the point that I want to zoom into.

function myGui
 % create the figure
  Fig = figure('Position',[0 0 1200 800],'Visible','off');
  movegui(Fig,'center');
  set(Fig,'Tag','screen','HandleVisibility','on','Visible','on');
 %read image and point from workspace:
 trueImage= axes('Units','Pixel','Position', [20 70 900 750]);
 Image=evalin('base','trueImage');
 point=evalin('base',point); 
 imshow(Image);
 hold on;
 plot(point(1,1),point(1,2),'c.','MarkerSize',10);    %specifying the marker to the point I want
 % create the buttons
 falsePositive_handle = uicontrol(Fig,'Style','pushbutton','String','False Positive',...
    'Position',[950 700 200 60], 'Callback', @falsePositive_Callback);
 falseNegative_handle = uicontrol(Fig,'Style','pushbutton','String','False Negative',...
    'Position',[950 600 200 60], 'Callback', @falseNegative_Callback);
 zoomingSlider = uicontrol(Fig,'Style','slider','Min', 0, 'Max', 400,...
    'Value', 0, 'Units', 'Pixel', 'Position', [20 75 200 20],...
    'Callback', zoomingSlider_Callback);
 end
 function falsePositive_Callback(hObject, eventdata)
 label=1;
 assignin('base','label',label);
 end