Data tip when using two y-Axes

Hi,

I have two y-axis. How can I display both y-values when I create a data tip?

Thanks.

aMatrix = rand(20,30);
yAxis1 = 32.*(1:size(aMatrix,1));
yAxis2 = 165.*(1:size(aMatrix,1));
xAxis = 1:size(aMatrix,2);
yyaxis left
imagesc(xAxis, yAxis1, aMatrix);
ax = gca;
ax.YColor = ax.XColor;
ylabel('Left Side')
yyaxis right
imagesc(xAxis, yAxis2,aMatrix);
ax.YColor = ax.XColor;
ylabel('Right Side')  

Answer 1

[Benjamin Kraus]

You can add anything you want to the data tips by modifying the DataTipTemplate.

It is a bit tricky to do with images, because you need to specify one value for every pixel of the image, but I think this will do basically what you were asking:

aMatrix = rand(20,30);
yAxis1 = 32.*(1:size(aMatrix,1));
yAxis2 = 165.*(1:size(aMatrix,1));
xAxis = 1:size(aMatrix,2);
yyaxis left
imagesc(xAxis, yAxis1, aMatrix);
ax = gca;
ax.YColor = ax.XColor;
ylabel('Left Side')
yyaxis right
im = imagesc(xAxis, yAxis2,aMatrix);
ax.YColor = ax.XColor;
ylabel('Right Side')

% You need to create a datatip first before you can set the DataTipTemplate
% on an image. You can delete it immediately after it is created.
dt = datatip(im);
delete(dt);

% Create a matrix the same size as the image data to use in the data tip.
yAxis1DataTip = yAxis1'+zeros(size(aMatrix));
yAxis2DataTip = yAxis2'+zeros(size(aMatrix));

% Add two rows to the data tip, one that shows Y1, and the other that shows
% Y2.
im.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("Y1",yAxis1DataTip);
im.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("Y2",yAxis2DataTip);

[Konvictus177]

This works great!

How could I also display the X coordinate in the last two rows of the data tip?

X1 Y1

X2 Y2

The following does not give me x and y at the same time:

aMatrix = rand(20,30);
yAxis1 = 32.*(1:size(aMatrix,1));
yAxis2 = 165.*(1:size(aMatrix,1));
xAxis = 1:size(aMatrix,2);
yyaxis left
imagesc(xAxis, yAxis1, aMatrix);
ax = gca;
ax.YColor = ax.XColor;
ylabel('Left Side')
yyaxis right
im = imagesc(xAxis, yAxis2,aMatrix);
ax.YColor = ax.XColor;
ylabel('Right Side')
% You need to create a datatip first before you can set the DataTipTemplate
% on an image. You can delete it immediately after it is created.
dt = datatip(im);
delete(dt);
% Create a matrix the same size as the image data to use in the data tip.
yAxis1DataTip = yAxis1'+zeros(size(aMatrix));
yAxis2DataTip = yAxis2'+zeros(size(aMatrix));

xAxisDataTip = xAxis+zeros(size(aMatrix));

% Add two rows to the data tip, one that shows Y1, and the other that shows
% Y2.
im.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("X1 Y1", [xAxisDataTip, yAxis1DataTip]);
im.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("X2 Y2", [xAxisDataTip, yAxis2DataTip]);

[Benjamin Kraus]

You need one value per pixel in the image.

Your code is creating two values per pixel in the image:

[xAxisDataTip, yAxis1DataTip]

What you can do is create your own strings, then have one string per pixel:

string(xAxisDataTip) + ", " + string(yAxis1DataTip);

The full code would look like this:

aMatrix = rand(20,30);
yAxis1 = 32.*(1:size(aMatrix,1));
yAxis2 = 165.*(1:size(aMatrix,1));
xAxis = 1:size(aMatrix,2);
yyaxis left
im1 = imagesc(xAxis, yAxis1, aMatrix);
ax = gca;
ax.YColor = ax.XColor;
ylabel('Left Side')
yyaxis right
im2 = imagesc(xAxis, yAxis2, aMatrix);
ax.YColor = ax.XColor;
ylabel('Right Side')

% You need to create a datatip first before you can set the DataTipTemplate
% on an image. You can delete it immediately after it is created.
dt = datatip(im2);
delete(dt);

% Now customize the data tip.
xAxisDataTip = xAxis+zeros(size(aMatrix));
yAxis1DataTip = yAxis1'+zeros(size(aMatrix));
yAxis2DataTip = yAxis2'+zeros(size(aMatrix));

im2.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("X1 Y1",string(xAxisDataTip) + ", " + string(yAxis1DataTip));
im2.DataTipTemplate.DataTipRows(end+1) = dataTipTextRow("X2 Y2",string(xAxisDataTip) + ", " + string(yAxis2DataTip));
im2.DataTipTemplate.DataTipRows(1) = [];

[Konvictus177]

Thank you. Exactly what I was looking for!

I still have an issue with only one y axis being zoomed when I use zoom but I think this is slightly going off topic here.