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Bug 48408: Improved documentation for Sheet.setColumnWidth

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1137656 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2011-06-20 15:16:46 +00:00
parent 2761d5a900
commit 02c3df2e5f
4 changed files with 110 additions and 5 deletions
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1
src/documentation/content/xdocs/status.xml
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@ -34,6 +34,7 @@
<changes>
<release version="3.8-beta4" date="2011-??-??">
<action dev="poi-developers" type="fix">48408 - Improved documentation for Sheet.setColumnWidth </action>
<action dev="poi-developers" type="add">51390 - Added handling of additional properties to HWPF ParagraphSprmCompressor</action>
<action dev="poi-developers" type="add">51389 - Support for sprmPJc paragraph SPRM in HWPF</action>
<action dev="poi-developers" type="fix">48469 - New Case Study for PI web site </action>

36
src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java
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@ -429,15 +429,47 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
/**
* Set the width (in units of 1/256th of a character width)
*
* <p>
* The maximum column width for an individual cell is 255 characters.
* This value represents the number of characters that can be displayed
* in a cell that is formatted with the standard font.
* in a cell that is formatted with the standard font (first font in the workbook).
* </p>
*
* <p>
* Character width is defined as the maximum digit width
* of the numbers <code>0, 1, 2, … 9</code> as rendered
* using the default font (first font in the workbook).
* <br/>
* Unless you are using a very special font, the default character is '0' (zero),
* this is true for Arial (default font font in HSSF) and Calibri (default font in XSSF)
* </p>
*
* <p>
* Please note, that the width set by this method includes 4 pixels of margin padding (two on each side),
* plus 1 pixel padding for the gridlines (Section 3.3.1.12 of the OOXML spec).
* This results is a slightly less value of visible characters than passed to this method (approx. 1/2 of a character).
* </p>
* <p>
* To compute the actual number of visible characters,
* Excel uses the following formula (Section 3.3.1.12 of the OOXML spec):
* </p>
* <code>
* width = Truncate([{Number of Visible Characters} *
* {Maximum Digit Width} + {5 pixel padding}]/{Maximum Digit Width}*256)/256
* </code>
* <p>Using the Calibri font as an example, the maximum digit width of 11 point font size is 7 pixels (at 96 dpi).
* If you set a column width to be eight characters wide, e.g. <code>setColumnWidth(columnIndex, 8*256)</code>,
* then the actual value of visible characters (the value shown in Excel) is derived from the following equation:
* <code>
Truncate([numChars*7+5]/7*256)/256 = 8;
* </code>
*
* which gives <code>7.29</code>.
*
* @param columnIndex - the column to set (0-based)
* @param width - the width in units of 1/256th of a character width
* @throws IllegalArgumentException if width > 65280 (the maximum column width in Excel)
* @throws IllegalArgumentException if width > 255*256 (the maximum column width in Excel is 255 characters)
*/
public void setColumnWidth(int columnIndex, int width) {
_sheet.setColumnWidth(columnIndex, width);

42
src/java/org/apache/poi/ss/usermodel/Sheet.java
View File

@ -118,19 +118,59 @@ public interface Sheet extends Iterable<Row> {
/**
* Set the width (in units of 1/256th of a character width)
*
* <p>
* The maximum column width for an individual cell is 255 characters.
* This value represents the number of characters that can be displayed
* in a cell that is formatted with the standard font.
* in a cell that is formatted with the standard font (first font in the workbook).
* </p>
*
* <p>
* Character width is defined as the maximum digit width
* of the numbers <code>0, 1, 2, … 9</code> as rendered
* using the default font (first font in the workbook).
* <br/>
* Unless you are using a very special font, the default character is '0' (zero),
* this is true for Arial (default font font in HSSF) and Calibri (default font in XSSF)
* </p>
*
* <p>
* Please note, that the width set by this method includes 4 pixels of margin padding (two on each side),
* plus 1 pixel padding for the gridlines (Section 3.3.1.12 of the OOXML spec).
* This results is a slightly less value of visible characters than passed to this method (approx. 1/2 of a character).
* </p>
* <p>
* To compute the actual number of visible characters,
* Excel uses the following formula (Section 3.3.1.12 of the OOXML spec):
* </p>
* <code>
* width = Truncate([{Number of Visible Characters} *
* {Maximum Digit Width} + {5 pixel padding}]/{Maximum Digit Width}*256)/256
* </code>
* <p>Using the Calibri font as an example, the maximum digit width of 11 point font size is 7 pixels (at 96 dpi).
* If you set a column width to be eight characters wide, e.g. <code>setColumnWidth(columnIndex, 8*256)</code>,
* then the actual value of visible characters (the value shown in Excel) is derived from the following equation:
* <code>
Truncate([numChars*7+5]/7*256)/256 = 8;
* </code>
*
* which gives <code>7.29</code>.
*
* @param columnIndex - the column to set (0-based)
* @param width - the width in units of 1/256th of a character width
* @throws IllegalArgumentException if width > 255*256 (the maximum column width in Excel is 255 characters)
*/
void setColumnWidth(int columnIndex, int width);
/**
* get the width (in units of 1/256th of a character width )
*
* <p>
* Character width is defined as the maximum digit width
* of the numbers <code>0, 1, 2, … 9</code> as rendered
* using the default font (first font in the workbook)
* </p>
*
* @param columnIndex - the column to set (0-based)
* @return width - the width in units of 1/256th of a character width
*/

36
src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFSheet.java
View File

@ -1899,15 +1899,47 @@ public class XSSFSheet extends POIXMLDocumentPart implements Sheet {
/**
* Set the width (in units of 1/256th of a character width)
*
* <p>
* The maximum column width for an individual cell is 255 characters.
* This value represents the number of characters that can be displayed
* in a cell that is formatted with the standard font.
* in a cell that is formatted with the standard font (first font in the workbook).
* </p>
*
* <p>
* Character width is defined as the maximum digit width
* of the numbers <code>0, 1, 2, … 9</code> as rendered
* using the default font (first font in the workbook).
* <br/>
* Unless you are using a very special font, the default character is '0' (zero),
* this is true for Arial (default font font in HSSF) and Calibri (default font in XSSF)
* </p>
*
* <p>
* Please note, that the width set by this method includes 4 pixels of margin padding (two on each side),
* plus 1 pixel padding for the gridlines (Section 3.3.1.12 of the OOXML spec).
* This results is a slightly less value of visible characters than passed to this method (approx. 1/2 of a character).
* </p>
* <p>
* To compute the actual number of visible characters,
* Excel uses the following formula (Section 3.3.1.12 of the OOXML spec):
* </p>
* <code>
* width = Truncate([{Number of Visible Characters} *
* {Maximum Digit Width} + {5 pixel padding}]/{Maximum Digit Width}*256)/256
* </code>
* <p>Using the Calibri font as an example, the maximum digit width of 11 point font size is 7 pixels (at 96 dpi).
* If you set a column width to be eight characters wide, e.g. <code>setColumnWidth(columnIndex, 8*256)</code>,
* then the actual value of visible characters (the value shown in Excel) is derived from the following equation:
* <code>
Truncate([numChars*7+5]/7*256)/256 = 8;
* </code>
*
* which gives <code>7.29</code>.
*
* @param columnIndex - the column to set (0-based)
* @param width - the width in units of 1/256th of a character width
* @throws IllegalArgumentException if width > 65280 (the maximum column width in Excel)
* @throws IllegalArgumentException if width > 255*256 (the maximum column width in Excel is 255 characters)
*/
public void setColumnWidth(int columnIndex, int width) {
if(width > 255*256) throw new IllegalArgumentException("The maximum column width for an individual cell is 255 characters.");