Find Data Value with Mouse on a QtChart

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Hey everyone,

Hope all is well. Currently, I have been working on an app that uses QtCharts and QChartView. No issues thus far with most of the features I am trying to implement, as I have been able to find documentation or have been helped by this wonderful community. However, I do have one question, as I've hit a roadblock.

Currently, I am trying to implement a feature in which the mouse can hover (and possibly even click) on individual data points to get data readings. Something akin to how the Google Stock Price Charts work:

Graph Example.gif
Source: (https://www.google.com/finance/quote/NVDA:NASDAQ?sa=X&sqi=2&ved=2ahUKEwj1rOX__dP0AhWNVN8KHYbDDlkQ3ecFegQIIxAe)

As the gif above shows, I'd like to have some sort of feature where it displays the data point in relation to the x-location of the mouse.

What would I need to do to start this? I tried using a mouseMoveEvent function but the app crashed; that is the only thing I've tried so far. Thank you, in advance, for your time and consideration!

MrShawn

Hi @WesLow

Simply use the hovered signal. It will give you the point x y data as well.

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@MrShawn said in Find Data Value with Mouse on a QtChart:

hovered

So would I need to do something like this?

connect(seriesName, QXYSeries::hovered, chartName, displayPlotValueFunction);

Or would I need to try something else? Confused about the last parameter. Or, am I overcomplicating things? Thank you for your response!

jsulm

@WesLow said in Find Data Value with Mouse on a QtChart:

Confused about the last parameter

Last parameter is the pointer to slot:

connect(seriesName, &QXYSeries::hovered, yourClassInstancePointer, &YourClassName::displayPlotValueFunction);