Flex Examples
The following example shows how you can adjust the interval of horizontal grid lines in a LineChart by setting the horizontalChangeCount style.
Full code after the jump.
<?xml version="1.0"?>
<!-- http://blog.flexexamples.com/2007/11/15/changing-the-horizontal-grid-line-frequency-in-a-flex-linechart-control-using-the-horizontalchangecount-style/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<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:ApplicationControlBar dock="true">
<mx:Label text="horizontalChangeCount:" />
<mx:HSlider id="slider"
minimum="1"
maximum="5"
liveDragging="true"
snapInterval="1" />
<mx:Spacer width="100%" />
<mx:Legend dataProvider="{lineChart}"
direction="horizontal" />
</mx:ApplicationControlBar>
<mx:LineChart id="lineChart"
showDataTips="true"
dataProvider="{dp}"
width="100%"
height="100%">
<mx:backgroundElements>
<mx:GridLines direction="horizontal"
horizontalChangeCount="{slider.value}">
<mx:horizontalStroke>
<mx:Stroke color="black" weight="0" alpha="0.2" />
</mx:horizontalStroke>
</mx:GridLines>
</mx:backgroundElements>
<!-- 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="@open" displayName="Open" />
</mx:series>
</mx:LineChart>
</mx:Application>
View source is enabled in the following example.
You can also change the horizontalChangeCount style using CSS, similar to the following snippet:
<mx:Style>
GridLines {
horizontalChangeCount: 2;
}
</mx:Style>
Or you can change the horizontalChangeCount style using ActionScript, using the setStyle() method, similar to the following snippet:
myGridLines.setStyle("horizontalChangeCount", 2);
If you want to alternate background row colors in the LineChart, simply set the horizontalAlternateFill style, as seen in the following example:
<?xml version="1.0"?>
<!-- http://blog.flexexamples.com/2007/11/15/changing-the-horizontal-grid-line-frequency-in-a-flex-linechart-control-using-the-horizontalchangecount-style/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="middle"
backgroundColor="white">
<mx:Style>
GridLines {
horizontalChangeCount: 3;
horizontalAlternateFill: white;
}
</mx:Style>
<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:ApplicationControlBar dock="true">
<mx:Label text="horizontalChangeCount:" />
<mx:HSlider id="slider"
minimum="1"
maximum="5"
liveDragging="true"
snapInterval="1" />
<mx:Spacer width="100%" />
<mx:Legend dataProvider="{lineChart}"
direction="horizontal" />
</mx:ApplicationControlBar>
<mx:LineChart id="lineChart"
showDataTips="true"
dataProvider="{dp}"
width="100%"
height="100%">
<mx:backgroundElements>
<mx:GridLines direction="horizontal"
horizontalChangeCount="{slider.value}">
<mx:horizontalStroke>
<mx:Stroke color="black" weight="0" alpha="0.2" />
</mx:horizontalStroke>
</mx:GridLines>
</mx:backgroundElements>
<!-- 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="@open" displayName="Open" />
</mx:series>
</mx:LineChart>
</mx:Application>
View source is enabled in the following example.
Peter deHaan
Peter deHaan currently works for Adobe on the Flex SDK QA team. While not working on Flex, Flash, and ColdFusion applications, Peter enjoys making up bios and writing in 3rd person. Peter's rarely updated blog can be found at blogs.adobe.com/pdehaan/, actionscriptexamples.com, airexamples.com, and coldfusionexamples.com.
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