Simple question about dynamic attributes

Support
#1

Hello.

I’m starting the use of Cuba and I’m a little bit lost to get a “how to” for solving my problem.

I need to manage rendering a chart the number of graphs may change. I’ve seen how add dynamically new graphs for a chart. However the chart is bound to a non persistent entity and I need to add a new attribute that will hold the value for a new chart’s graph.

That’s here where I’m stuck. I tried to use something like
pt.setDynamicAttributes(new HashMap<>());
pt.setValue(“newSerie”,value );
but it doesn’t work.

yes, because of course I want to do it dynamically, by code…

Is someone able to provide me with a working example or a link to existing sources dealing with that issue?
Would be highly appreciated.

Thanks a lot - at least for reading me.

#3

Hi,

If I got your requirements right, I would recommend using DataProvider with MapDataItems.

MapDataItem is based on a map, so that you can easily add value fields dynamically, e.g.:

/**
 * Add data for existing categories for the given graph's valueField.
 *
 * @param valueField the name of graph's valueField
 */
private void addGraphData(String valueField) {
    DataProvider dataProvider = serialChart.getDataProvider();
    for (DataItem dataItem : dataProvider.getItems()) {
        Date date = (Date) dataItem.getValue(CATEGORY_FIELD_NAME);
        Integer value = getItemValue(date, valueField);
        if (dataItem instanceof MapDataItem) {
            ((MapDataItem) dataItem).add(valueField, value);
        } else {
            throw new IllegalStateException("'dataItem' isn't MapDataItem, but " + dataItem.getClass());
        }
    }
}

@Subscribe("addGraphBtn")
public void onAddGraphBtnClick(Button.ClickEvent event) {
    String valueField = "...";

    Graph graph = new Graph()
            .setValueField(valueField);

    addGraphData(valueField);

    serialChart.addGraphs(graph);
    serialChart.repaint();
}

In order to illustrate the above, I’ve attached a demo project: dynamic-chart-demo.zip (79.3 KB)

Regards,
Gleb

2 Likes
#5

Hi Gleb

Thanks it makes the job!
I’ll dive in the example’s code and adapt it to my context.
Thanks again.

#6

One more question, in the example you kindly provided, how would I do to add a legend displaying the name of the series (value, value1, etc) ?
<chart:legend autoMargins=“false”
marginRight=“20”
markerType=“CIRCLE”
position=“RIGHT”
valueText="[[???]]"/>
I can’t find what to replace the question marks with.

Thanks in advance

#7

Hi hi.
I’m answering to myself

1/ when creating the new Graph add .setTilte(your_serial_name_variable)
2/ the code for the legend is something like:
<chart:legend autoMargins=“false”
marginRight=“20”
markerType=“CIRCLE”
position=“RIGHT”
valueText="[[title]]"
/>

Easy.

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