Changing a chart legend’s direction

The following example shows how you can change the direction of a Flex chart’s legend by setting the direction property, as seen in the following snippet:

<mx:Legend dataProvider="{lineChart}" direction="horizontal" />

Full code after the jump.

View MXML

<?xml version="1.0"?>
<!-- http://blog.flexexamples.com/2007/11/17/changing-a-chart-legends-direction/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.events.ItemClickEvent;

            private function toggleButtonBar_itemClick(evt:ItemClickEvent):void {
                var idx:uint = ToggleButtonBar(evt.currentTarget).selectedIndex;
                legend.direction = arr[idx];
            }
        ]]>
    </mx:Script>

    <mx:XMLListCollection id="dp">
        <mx:source>
            <mx:XMLList>
                <quote date="8/27/2007" open="40.38" close="40.81" />
                <quote date="8/24/2007" open="40.5" close="40.41" />
                <quote date="8/23/2007" open="40.82" close="40.6" />
                <quote date="8/22/2007" open="40.4" close="40.77" />
                <quote date="8/21/2007" open="40.41" close="40.13" />
                <quote date="8/20/2007" open="40.55" close="40.74" />
                <quote date="8/17/2007" open="40.18" close="40.32" />
                <quote date="8/16/2007" open="39.83" close="39.96" />
                <quote date="8/15/2007" open="40.22" close="40.18" />
                <quote date="8/14/2007" open="41.01" close="40.41" />
                <quote date="8/13/2007" open="41" close="40.83" />
                <quote date="8/10/2007" open="41.3" close="41.06" />
                <quote date="8/9/2007" open="39.9" close="40.75" />
                <quote date="8/8/2007" open="39.61" close="40.23" />
                <quote date="8/7/2007" open="39.08" close="39.42" />
                <quote date="8/6/2007" open="38.71" close="39.38" />
                <quote date="8/3/2007" open="39.47" close="38.75" />
                <quote date="8/2/2007" open="39.4" close="39.52" />
                <quote date="8/1/2007" open="40.29" close="39.58" />
            </mx:XMLList>
        </mx:source>
    </mx:XMLListCollection>


    <mx:Array id="arr">
        <mx:String>horizontal</mx:String>
        <mx:String>vertical</mx:String>
    </mx:Array>

    <mx:ApplicationControlBar dock="true">
        <mx:ToggleButtonBar id="toggleButtonBar"
                dataProvider="{arr}"
                selectedIndex="0"
                itemClick="toggleButtonBar_itemClick(event);" />
    </mx:ApplicationControlBar>

    <mx:LineChart id="lineChart"
            showDataTips="true"
            dataProvider="{dp}"
            width="100%"
            height="100%">

        <!-- series filters -->
        <mx:seriesFilters>
            <mx:Array />
        </mx:seriesFilters>

        <!-- vertical axis -->
        <mx:verticalAxis>
            <mx:LinearAxis baseAtZero="false"
                    title="Price" />
        </mx:verticalAxis>

        <!-- horizontal axis -->
        <mx:horizontalAxis>
            <mx:CategoryAxis id="ca"
                    categoryField="@date"
                    title="Date" />
        </mx:horizontalAxis>

        <!-- horizontal axis renderer -->
        <mx:horizontalAxisRenderers>
            <mx:AxisRenderer axis="{ca}"
                    canDropLabels="true" />
        </mx:horizontalAxisRenderers>

        <!-- series -->
        <mx:series>
            <mx:LineSeries yField="@close"
                    form="curve"
                    displayName="Close" />
            <mx:LineSeries yField="@open"
                    form="curve"
                    displayName="Open" />
        </mx:series>
    </mx:LineChart>

    <mx:ControlBar>
        <mx:Legend id="legend"
                dataProvider="{lineChart}"
                direction="horizontal" />
    </mx:ControlBar>

</mx:Application>

View source is enabled in the following example.

0 thoughts on “Changing a chart legend’s direction

  1. Bill Jones,

    It appears you can use an <mx:Style /> block and set the fontWeight style on the LegendItem selector:

    <mx:Style>
        LegendItem {
            fontWeight: normal;
        }
    </mx:Style>
    

    I’ll file a Flex bug for this as it seems you *should* be able able to set that style on the <mx:Legend /> tag or on the Legend CSS selector.

    Peter

    Bug filed: http://bugs.adobe.com/jira/browse/FLEXDMV-1902

    New entry posted: “Setting the font weight on a charting Legend control in Flex”

  2. Hi,

    I am using AxisRenderer’s canDropLabels property to drop overlapping labels,
    is there a way that I can specify to drop every third label ?

    please help,

    thanks,

    Nitin.

  3. Hi,
    I used the direction tag to display my legend vertically but because it contains lots of items it is rendered on 2 columns.
    Do you know how to force the legend to be rendered on one column (the legend is in a Canvas and I would like the Canvas to show a vertical scrollbar)?

    thanks

    Seb