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Thread: How to use QwtLegend?

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    Default How to use QwtLegend?

    The documentation around Qwt widgets isn't great, and can't find any simple examples on how to get started with QwtLegend. I'd like a simple legend on the right or bottom of a my bar chart representing that red bars are 'negative change' and blue bars are 'positive'. Could anyone provide an example? Any help or direction would be much appreciated.

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    Default Re: How to use QwtLegend?

    Qwt has it's own examples in subdir of your source code:
    .\examples
    .\playground

    In subdir examples you will find the example "legends".

    If you want to have a legend inside your canvas use QwtPlotLegendItem

  3. #3
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    Default Re: How to use QwtLegend?

    Quote Originally Posted by HappyCoder View Post
    Qwt has it's own examples in subdir of your source code:
    .\examples
    .\playground

    In subdir examples you will find the example "legends".

    If you want to have a legend inside your canvas use QwtPlotLegendItem
    The examples don't do anything I want - they all demonstrate how to plot legends for each curve. I'd like to just create a custom legend from scratch

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    Default Re: How to use QwtLegend?

    Quote Originally Posted by ashley1 View Post
    The examples don't do anything I want - they all demonstrate how to plot legends for each curve. I'd like to just create a custom legend from scratch
    When your legend is completely unrelated to the plot items you can simply use QLabels and arrange plot and labels in some QLayout.

    Otherwise you would need to provide more details: how many bar items do you have and which attributes of them do you want to display how on your legend.

    Uwe

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    Default Re: How to use QwtLegend?

    Quote Originally Posted by ashley1 View Post
    [...] that red bars are 'negative change' and blue bars are 'positive'
    add to ONE red bar the QwtPlotItem::ItemAttribute that it should be shown in legend, all other false
    add to ONE blue bar the QwtPlotItem::ItemAttribute that it should be shown in legend, all other false

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