How can I use imellipse on a GUI?

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Rossy Drucker Shaooli
评论： Rossy Drucker Shaooli 2019-6-4
I want to draw a circle using imellipse on an image in a gui and then using a button get the position of that circle. However when I try to run the code, it gives an error saying there are not enough input arguments, eventhough the syntax is imellipse(hparent).
function SAMPLE(hObject,eventdata, handles)
vid = VideoReader('filename.avi');
frames = read(vid);
conv = rgb2gray(frames);
fig = uifigure;
[yax, xax] = size(conv);
ax = uiaxes('Parent',fig,'XLim',[0,xax],'YLim',[0,yax]);
imagesc(ax, conv)
btn = uibutton(fig,'push','Text','Ready','Position',[420,218,100,22],'ButtonPushedFcn', @expCirc);
circ = imellipse(handles.axes);
function expCirc(btn,event)
pos = getPosition(circ);
x = pos(1,1);
y = pos(1,2);
w = pos(1,3);
h = pos(1,4);
center = [x+(w/2),y+(h/2)];
radius = w/2*1.5;
ncirc = viscircles(center, radius);
end
end
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Geoff Hayes
Geoff Hayes 2019-6-3
Are you using GUIDE? Did you create the axes already (in the GUI editor)? What is the value for handles.axes?
Rossy Drucker Shaooli
Rossy Drucker Shaooli 2019-6-4
I solved it, my problem was that I was triying to use a GUI but I didn't really need it. Thanks for your help anyways!

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回答（1 个）

Dennis
Dennis 2019-6-4
When asking a question you should always include the complete error message.
My guess is that your error message tells you that you do not have enough input arguments, because your SAMPLE function is not a callback.
Beyond that i think you might run into a few problems using the uifigure/uiaxes instead of figure/axes.
function SAMPLE
vid = VideoReader('filename.avi');
frames = read(vid);
conv = rgb2gray(frames);
fig = figure;
[yax, xax] = size(conv);
ax = axes('Parent',fig,'XLim',[0,xax],'YLim',[0,yax]);
imagesc(ax, conv)
btn = uicontrol('style','pushbutton','string','Ready','Position',[420,218,100,22],'callback', @expCirc);
circ = imellipse(ax);
function expCirc(btn,event)
pos = getPosition(circ);
x = pos(1,1);
y = pos(1,2);
w = pos(1,3);
h = pos(1,4);
center = [x+(w/2),y+(h/2)];
radius = w/2*1.5;
ncirc = viscircles(center, radius);
end
end

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