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# YUI Library Examples: Charts Control (experimental): Styling Lines, Borders and Fills

# Charts Control (experimental): Styling Lines, Borders and Fills

The YUI Charts Control offers customization through its style and series style objects. This example demonstrates one way to customize a Line Chart.

Please note: The YUI Charts Control requires Flash Player 9.0.45 or higher. The latest version of Flash Player is available at the Adobe Flash Player Download Center.

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January Daily Profits
Unable to load Flash content. The YUI Charts Control requires Flash Player 9.0.45 or higher. You can download the latest version of Flash Player from the Adobe Flash Player Download Center.

## Data

Our data will include an array of objects, containing values for the date, expenses and revenue. We will create a function that calculates and adds a profits field to each of these items in the array, and will pass this to our datasource.

//revenue and expenses per day var dailyFinancials = [ {date:"1/1/2009", revenue:14002, expenses:15000}, {date:"1/2/2009", revenue:14027, expenses:16527}, {date:"1/3/2009", revenue:15083, expenses:17283}, {date:"1/4/2009", revenue:15006, expenses:18694}, {date:"1/5/2009", revenue:15035, expenses:18235}, {date:"1/6/2009", revenue:17871, expenses:18371}, {date:"1/7/2009", revenue:25887, expenses:17787}, {date:"1/8/2009", revenue:16149, expenses:16149}, {date:"1/9/2009", revenue:17366, expenses:15666}, {date:"1/10/2009", revenue:16424, expenses:15776}, {date:"1/11/2009", revenue:15817, expenses:18717}, {date:"1/12/2009", revenue:13554, expenses:18154}, {date:"1/13/2009", revenue:19782, expenses:18182}, {date:"1/14/2009", revenue:24400, expenses:18600}, {date:"1/15/2009", revenue:21780, expenses:18480}, {date:"1/16/2009", revenue:16681, expenses:21581}, {date:"1/17/2009", revenue:24645, expenses:21745}, {date:"1/18/2009", revenue:22212, expenses:20388}, {date:"1/19/2009", revenue:24026, expenses:24726}, {date:"1/20/2009", revenue:29264, expenses:24864}, {date:"1/21/2009", revenue:19922, expenses:23622}, {date:"1/22/2009", revenue:12373, expenses:18773}, {date:"1/23/2009", revenue:11944, expenses:18444}, {date:"1/24/2009", revenue:23741, expenses:18641}, {date:"1/25/2009", revenue:24758, expenses:19758}, {date:"1/26/2009", revenue:31611, expenses:19611}, {date:"1/27/2009", revenue:25612, expenses:18212}, {date:"1/28/2009", revenue:26830, expenses:18330}, {date:"1/29/2009", revenue:27929, expenses:19029}, {date:"1/30/2009", revenue:28153, expenses:19953}, {date:"1/31/2009", revenue:28018, expenses:18118} ]; //calculate profits from revenue and expenses function calculateProfits(dataArray) { var dataLength = dataArray.length; for(var i = 0; i < dataLength; i++) { var dataObj = dataArray[i]; dataObj.profits = dataObj.revenue - dataObj.expenses; } return dataArray; } var myDataSource = new YAHOO.util.DataSource(calculateProfits(dailyFinancials)); myDataSource.responseType = YAHOO.util.DataSource.TYPE_JSARRAY; myDataSource.responseSchema = { fields: [ "date", "expenses", "revenue", "profits" ] };

## Series and Styles

Our series definition will include a series for expenses, revenue and profits. Each series will have a style block in which we will style the line, border and fill.

//series definition var seriesDef = [ { displayName:"Expenses", yField:"expenses", style: { lineColor:0xB5BAC8, lineAlpha:.5, borderColor:0xB5BAC8, fillColor:0xB5BAC8 } }, { displayName:"Revenue", yField:"revenue", style: { lineColor:0xB5BAC8, lineAlpha:.5, borderColor:0xB5BAC8, fillColor:0xffffff } }, { displayName:"Profits", yField:"profits", style: { lineColor:0x79839B, borderColor:0x79839B, fillColor:0x79839B } } ];

Since we are dealing with negative values, we want to have the ability to highlight them. The Cartesian Charts include a style called `zeroGridline`. If an axis contains positive and negative values, the `zeroGridline` style can be used to highlight the gridline that corresponds to zero on the axis. These properties will only take affect if the zero appears beyond the origin of an axis.

//Style object var styleDef = { xAxis: { majorTicks: { display:"inside", length:3, size:1 }, minorTicks: { display:"inside", length:2 }, labelRotation: -90 }, yAxis: { zeroGridLine: { size:2, color:0xff0000 }, minorTicks:{display:"none"} } }

## Chart

Next, we'll add methods for formatting our axis labels and datatip.

//format date labels YAHOO.example.formatTimeData = function(value, major) { var formattedData = YAHOO.util.Date.format(new Date(value), {format:"%b %e"}); return formattedData.toString(); } //format currency labels YAHOO.example.formatCurrencyAxisLabel = function( value ) { return YAHOO.util.Number.format( value, { prefix: "$", thousandsSeparator: ",", decimalPlaces: 2 }); } //DataTip function for the chart YAHOO.example.formatDataTipText = function(item, index, series) { var str = series.displayName + " for " + item.date; str += "\n" + YAHOO.example.formatCurrencyAxisLabel(item[(series.displayName).toLowerCase()]); return str; }

Create axes and set their label functions.

//Create a TimeAxis for displaying dates var myTimeAxis = new YAHOO.widget.TimeAxis(); myTimeAxis.labelFunction = YAHOO.example.formatTimeData; myTimeAxis.majorTimeUnit = "day"; //create a Numeric Axis for displaying dollars myCurrencyAxis = new YAHOO.widget.NumericAxis(); myCurrencyAxis.labelFunction = YAHOO.example.formatCurrencyAxisLabel;

Finally, we'll add our chart, setting its series definition, styles, axes and datatip function.

//create a Chart var mychart = new YAHOO.widget.LineChart("chart", myDataSource, { series: seriesDef, style: styleDef, xField: "date", xAxis: myTimeAxis, yAxis: myCurrencyAxis, dataTipFunction:YAHOO.example.formatDataTipText, //only needed for flash player express install expressInstall: "assets/expressinstall.swf" });

For full details about styles and series styles, read the Charts Control User's Guide.

## Configuration for This Example

You can load the necessary JavaScript and CSS for this example from Yahoo's servers. Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured.

### YUI Logger Output:

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### Charts Control (experimental) Examples:

- Charts Quickstart Example
- Chart with Legend Example
- Skinning a Chart Example
- Chart and DataTable Example
- Chart with DataSource Polling
- Stacked Bar Chart
- Charts in a TabView
- Column Chart with Rotated Title and Labels
- Styling Lines, Borders and Fills

### More Charts Control (experimental) Resources:

- User's Guide (external)
- API Documentation
- Cheat Sheet PDF (external)

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