datasetutilities.html

JFreeChart 9.20的文档 需要用JAVA在网页上做统计图的东东

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<A NAME="createCategoryDataset(java.lang.String, java.lang.String, double[][])"><!-- --></A><H3>
createCategoryDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data">CategoryDataset</A> <B>createCategoryDataset</B>(java.lang.String&nbsp;rowKeyPrefix,
                                                    java.lang.String&nbsp;columnKeyPrefix,
                                                    double[][]&nbsp;data)</PRE>
<DL>
<DD>Creates a <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data"><CODE>CategoryDataset</CODE></A> that contains a copy of the data in an array
 (instances of <code>Double</code> are created to represent the data items).
 <p>
 Row and column keys are created by appending 0, 1, 2, ... to the supplied prefixes.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rowKeyPrefix</CODE> - the row key prefix.<DD><CODE>columnKeyPrefix</CODE> - the column key prefix.<DD><CODE>data</CODE> - the data.
<DT><B>Returns:</B><DD>the dataset.</DL>
</DD>
</DL>
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<A NAME="createCategoryDataset(java.lang.String, java.lang.String, java.lang.Number[][])"><!-- --></A><H3>
createCategoryDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data">CategoryDataset</A> <B>createCategoryDataset</B>(java.lang.String&nbsp;rowKeyPrefix,
                                                    java.lang.String&nbsp;columnKeyPrefix,
                                                    java.lang.Number[][]&nbsp;data)</PRE>
<DL>
<DD>Creates a <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data"><CODE>CategoryDataset</CODE></A> that contains a copy of the data in an array.
 <p>
 Row and column keys are created by appending 0, 1, 2, ... to the supplied prefixes.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rowKeyPrefix</CODE> - the row key prefix.<DD><CODE>columnKeyPrefix</CODE> - the column key prefix.<DD><CODE>data</CODE> - the data.
<DT><B>Returns:</B><DD>the dataset.</DL>
</DD>
</DL>
<HR>

<A NAME="createCategoryDataset(java.lang.String[], java.lang.String[], double[][])"><!-- --></A><H3>
createCategoryDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data">CategoryDataset</A> <B>createCategoryDataset</B>(java.lang.String[]&nbsp;rowKeys,
                                                    java.lang.String[]&nbsp;columnKeys,
                                                    double[][]&nbsp;data)</PRE>
<DL>
<DD>Creates a <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data"><CODE>CategoryDataset</CODE></A> that contains a copy of the data in an array
 (instances of <code>Double</code> are created to represent the data items).
 <p>
 Row and column keys are taken from the supplied arrays.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rowKeys</CODE> - the row keys.<DD><CODE>columnKeys</CODE> - the column keys.<DD><CODE>data</CODE> - the data.
<DT><B>Returns:</B><DD>The dataset.</DL>
</DD>
</DL>
<HR>

<A NAME="createCategoryDataset(java.lang.String, org.jfree.data.KeyedValues)"><!-- --></A><H3>
createCategoryDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data">CategoryDataset</A> <B>createCategoryDataset</B>(java.lang.String&nbsp;rowKey,
                                                    <A HREF="../../../org/jfree/data/KeyedValues.html" title="interface in org.jfree.data">KeyedValues</A>&nbsp;rowData)</PRE>
<DL>
<DD>Creates a <A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data"><CODE>CategoryDataset</CODE></A> by copying the data from the supplied <A HREF="../../../org/jfree/data/KeyedValues.html" title="interface in org.jfree.data"><CODE>KeyedValues</CODE></A>
 instance.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>rowKey</CODE> - the row key.<DD><CODE>rowData</CODE> - the row data.
<DT><B>Returns:</B><DD>A dataset.</DL>
</DD>
</DL>
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<A NAME="isEmptyOrNull(org.jfree.data.XYDataset)"><!-- --></A><H3>
isEmptyOrNull</H3>
<PRE>
public static boolean <B>isEmptyOrNull</B>(<A HREF="../../../org/jfree/data/XYDataset.html" title="interface in org.jfree.data">XYDataset</A>&nbsp;data)</PRE>
<DL>
<DD>Returns <code>true</code> if the dataset is empty (or <code>null</code>), and
 <code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the dataset (<code>null</code> permitted).
<DT><B>Returns:</B><DD>A boolean.</DL>
</DD>
</DL>
<HR>

<A NAME="isEmptyOrNull(org.jfree.data.PieDataset)"><!-- --></A><H3>
isEmptyOrNull</H3>
<PRE>
public static boolean <B>isEmptyOrNull</B>(<A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A>&nbsp;dataset)</PRE>
<DL>
<DD>Returns <code>true</code> if the dataset is empty (or <code>null</code>), and
 <code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataset</CODE> - the dataset (<code>null</code> permitted).
<DT><B>Returns:</B><DD>a boolean.</DL>
</DD>
</DL>
<HR>

<A NAME="isEmptyOrNull(org.jfree.data.CategoryDataset)"><!-- --></A><H3>
isEmptyOrNull</H3>
<PRE>
public static boolean <B>isEmptyOrNull</B>(<A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data">CategoryDataset</A>&nbsp;data)</PRE>
<DL>
<DD>Returns <code>true</code> if the dataset is empty (or <code>null</code>), and
 <code>false</code> otherwise.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the dataset (<code>null</code> permitted).
<DT><B>Returns:</B><DD>A boolean.</DL>
</DD>
</DL>
<HR>

<A NAME="limitPieDataset(org.jfree.data.PieDataset, double)"><!-- --></A><H3>
limitPieDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A> <B>limitPieDataset</B>(<A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A>&nbsp;dataset,
                                         double&nbsp;percentThreshold)</PRE>
<DL>
<DD>Creates an "Other" slice for percentages below the percent threshold.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataset</CODE> - the PieDataset.<DD><CODE>percentThreshold</CODE> - the percent threshold.
<DT><B>Returns:</B><DD>A PieDataset.</DL>
</DD>
</DL>
<HR>

<A NAME="limitPieDataset(org.jfree.data.PieDataset, double, int)"><!-- --></A><H3>
limitPieDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A> <B>limitPieDataset</B>(<A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A>&nbsp;dataset,
                                         double&nbsp;percentThreshold,
                                         int&nbsp;minItems)</PRE>
<DL>
<DD>Create an "Other" slice for percentages below the percent threshold providing there
 are more slices below the percent threshold than specified in the slice threshold.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataset</CODE> - the source dataset.<DD><CODE>percentThreshold</CODE> - the percent threshold (ten percent is 0.10).<DD><CODE>minItems</CODE> - only aggregate low values if there are at least this many.
<DT><B>Returns:</B><DD>A PieDataset.</DL>
</DD>
</DL>
<HR>

<A NAME="limitPieDataset(org.jfree.data.PieDataset, double, int, java.lang.Comparable)"><!-- --></A><H3>
limitPieDataset</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A> <B>limitPieDataset</B>(<A HREF="../../../org/jfree/data/PieDataset.html" title="interface in org.jfree.data">PieDataset</A>&nbsp;dataset,
                                         double&nbsp;percentThreshold,
                                         int&nbsp;minItems,
                                         java.lang.Comparable&nbsp;key)</PRE>
<DL>
<DD>Creates a new pie dataset based on the supplied dataset, but modified by aggregating all 
 the low value items (those whose value is lower than the percentThreshold) into a single 
 item.  The aggregated items are assigned the specified key.  Aggregation only occurs if
 there are at least minItems items to aggregate.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataset</CODE> - the source dataset.<DD><CODE>percentThreshold</CODE> - the percent threshold (ten percent is 0.10).<DD><CODE>minItems</CODE> - only aggregate low values if there are at least this many.<DD><CODE>key</CODE> - the key to represent the aggregated items.
<DT><B>Returns:</B><DD>The pie dataset with (possibly) aggregated items.</DL>
</DD>
</DL>
<HR>

<A NAME="getStackedRangeExtent(org.jfree.data.TableXYDataset)"><!-- --></A><H3>
getStackedRangeExtent</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/Range.html" title="class in org.jfree.data">Range</A> <B>getStackedRangeExtent</B>(<A HREF="../../../org/jfree/data/TableXYDataset.html" title="interface in org.jfree.data">TableXYDataset</A>&nbsp;data)</PRE>
<DL>
<DD>Returns the minimum and maximum values for the dataset's range,
 assuming that the series are stacked.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>data</CODE> - the dataset.
<DT><B>Returns:</B><DD>the value range.</DL>
</DD>
</DL>
<HR>

<A NAME="getCumulativeRangeExtent(org.jfree.data.CategoryDataset)"><!-- --></A><H3>
getCumulativeRangeExtent</H3>
<PRE>
public static <A HREF="../../../org/jfree/data/Range.html" title="class in org.jfree.data">Range</A> <B>getCumulativeRangeExtent</B>(<A HREF="../../../org/jfree/data/CategoryDataset.html" title="interface in org.jfree.data">CategoryDataset</A>&nbsp;dataset)</PRE>
<DL>
<DD>Calculates the range of values for a dataset where each item is the running total of 
 the items for the current series.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>dataset</CODE> - the dataset.
<DT><B>Returns:</B><DD>The range.</DL>
</DD>
</DL>
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