Creating an interactive contour plot using a slider

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Ellie 2024-6-24，19:41

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评论： Matlab Pro 2024-6-26，7:13

This is a fairly general question. I am working on a project and have been provided GPR data. I have successfully generated contour plots, but was wondering if there was a way to utilize a slider to create an interactive contour map. Ideally, the end result would be the ability to slide and select the layer (out of 512) and view that respective contour plot. So far, looking into it, I have not been able to find any guidance on how to utilize the slider with contour plots specifically.

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Matlab Pro 2024-6-24，20:50

Hi @Ellie

I am less familiar with GPR data

Do you mean "Ground Penetrarting Radar" data?

anyhow - is what you mean is that the GPR data consists of 512 layres of heatmaps (each, lets say is 1000x1000 pixels) and using the slide: slider value = which layer contour to view?

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Answer 1

Matlab Pro 2024-6-24，22:10

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Hi @Ellie

well, I have created some dummy example with 40 levels depth

The uifigure 1st is loaded with the whole contour.

Changing the slider values - displays 4 differnt contour types - based on the DropDown

I am sure that one of the 4 options - is what you were looking for,,,

function contour_test()
NLevels = 40;
x = -2:0.01:2;
y = -2:0.01:3;
[X,Y] = meshgrid(x,y);
Z = X.*exp(-X.^2-Y.^2);
z0 = min(Z(:));
z1 = max(Z(:));
levels = linspace(z0,z1,NLevels);
fig = uifigure;
g = uigridlayout(fig);
g.RowHeight = {30, '1x'};
g.ColumnWidth = {'1x',60};
% Range drop-down
dd2 = uidropdown(g);
dd2.Items = {'all','1st level till..','from both sides','single countour'};
dd2.Layout.Row = 1;
dd2.Layout.Column = 1;
dd2.ValueChangedFcn = @sliderCallback;
ax = uiaxes(g);
ax.Layout.Row = 2;
ax.Layout.Column = 1;
ax.UserData = levels;
contour(X,Y,Z,levels,'Parent',ax)
sl = uislider(g);
sl.Orientation = 'vertical';
sl.Layout.Row = [1, 2];
sl.Layout.Column = 2;
sl.Limits = [1, NLevels];
sl.ValueChangedFcn = @sliderCallback;
end
 %=============================================
function sliderCallback(hObject,eventData)
fig = ancestor(hObject,'figure','toplevel');
ax = findall(fig,'type','axes');
sl = findall(fig,'type','uislider');
val = sl.Value;
X = ax.Children.XData;
Y = ax.Children.YData;
Z = ax.Children.ZData;
levels = ax.UserData;
dd = findall(fig,'Type','uidropdown');
items = dd.Items;
switch dd.Value
    case items{1}
        contour(X,Y,Z,levels,'Parent',ax)
    case items{2}
        contour(X,Y,Z,levels(1:floor(val)),'parent',ax);
    case items{3}
        contour(X,Y,Z,val,'parent',ax);
    case items{4}
        v = levels(floor(val));
        contour(X,Y,Z,[v v],'parent',ax);
end
end

Have fun!

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Ellie 2024-6-25，15:41

I will be sure to try this out!! I thank you for the earnest and in depth answer, this is a long term project and I am fairly new to matlab. I appeciate it.