5.1.1 Data Types

There are 6 data value types available in MCharts. The first 4 are the most frequently used:

• KEY - the key data column, which usually corresponds to X value

• VALUE - the value data column, which usually corresponds to Y value

• EXTENT - the extent data column, which usually corresponds to Z (elevation) value

• EXTRA - extra data column, which usually corresponds to asymmetric error value

• EXTRA2 - the second extra data column, which usually is used in financial charts

• EXTRA3 - the third extra data column, which is left for user usage

Using DataColumnTypes:

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// Creating data list
ArrayList<Object[]> data = new ArrayList<Object[]>();
 
data.add(new Object[] { "January", new Double(19.5), new Double(8.9) });
data.add(new Object[] { "February", new Double(26.6), new Double(13.3) });
 
// ChartDataModel creation using ColumnTypes
ChartDataModel dataModel = new ChartDataModel(new DataColumnType[] {
   DataColumnType.KEY, DataColumnType.VALUE, DataColumnType.EXTENT },
   list);