यहाँ यह हो सकता है आप के लिए क्या देख रहे:
StringUtils.java:
import java.awt.FontMetrics;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* Globally available utility classes, mostly for string manipulation.
*
* @author Jim Menard, <a href="mailto:[email protected]">[email protected]</a>
*/
public class StringUtils {
/**
* Returns an array of strings, one for each line in the string after it has
* been wrapped to fit lines of <var>maxWidth</var>. Lines end with any of
* cr, lf, or cr lf. A line ending at the end of the string will not output a
* further, empty string.
* <p>
* This code assumes <var>str</var> is not <code>null</code>.
*
* @param str
* the string to split
* @param fm
* needed for string width calculations
* @param maxWidth
* the max line width, in points
* @return a non-empty list of strings
*/
public static List wrap(String str, FontMetrics fm, int maxWidth) {
List lines = splitIntoLines(str);
if (lines.size() == 0)
return lines;
ArrayList strings = new ArrayList();
for (Iterator iter = lines.iterator(); iter.hasNext();)
wrapLineInto((String) iter.next(), strings, fm, maxWidth);
return strings;
}
/**
* Given a line of text and font metrics information, wrap the line and add
* the new line(s) to <var>list</var>.
*
* @param line
* a line of text
* @param list
* an output list of strings
* @param fm
* font metrics
* @param maxWidth
* maximum width of the line(s)
*/
public static void wrapLineInto(String line, List list, FontMetrics fm, int maxWidth) {
int len = line.length();
int width;
while (len > 0 && (width = fm.stringWidth(line)) > maxWidth) {
// Guess where to split the line. Look for the next space before
// or after the guess.
int guess = len * maxWidth/width;
String before = line.substring(0, guess).trim();
width = fm.stringWidth(before);
int pos;
if (width > maxWidth) // Too long
pos = findBreakBefore(line, guess);
else { // Too short or possibly just right
pos = findBreakAfter(line, guess);
if (pos != -1) { // Make sure this doesn't make us too long
before = line.substring(0, pos).trim();
if (fm.stringWidth(before) > maxWidth)
pos = findBreakBefore(line, guess);
}
}
if (pos == -1)
pos = guess; // Split in the middle of the word
list.add(line.substring(0, pos).trim());
line = line.substring(pos).trim();
len = line.length();
}
if (len > 0)
list.add(line);
}
/**
* Returns the index of the first whitespace character or '-' in <var>line</var>
* that is at or before <var>start</var>. Returns -1 if no such character is
* found.
*
* @param line
* a string
* @param start
* where to star looking
*/
public static int findBreakBefore(String line, int start) {
for (int i = start; i >= 0; --i) {
char c = line.charAt(i);
if (Character.isWhitespace(c) || c == '-')
return i;
}
return -1;
}
/**
* Returns the index of the first whitespace character or '-' in <var>line</var>
* that is at or after <var>start</var>. Returns -1 if no such character is
* found.
*
* @param line
* a string
* @param start
* where to star looking
*/
public static int findBreakAfter(String line, int start) {
int len = line.length();
for (int i = start; i < len; ++i) {
char c = line.charAt(i);
if (Character.isWhitespace(c) || c == '-')
return i;
}
return -1;
}
/**
* Returns an array of strings, one for each line in the string. Lines end
* with any of cr, lf, or cr lf. A line ending at the end of the string will
* not output a further, empty string.
* <p>
* This code assumes <var>str</var> is not <code>null</code>.
*
* @param str
* the string to split
* @return a non-empty list of strings
*/
public static List splitIntoLines(String str) {
ArrayList strings = new ArrayList();
int len = str.length();
if (len == 0) {
strings.add("");
return strings;
}
int lineStart = 0;
for (int i = 0; i < len; ++i) {
char c = str.charAt(i);
if (c == '\r') {
int newlineLength = 1;
if ((i + 1) < len && str.charAt(i + 1) == '\n')
newlineLength = 2;
strings.add(str.substring(lineStart, i));
lineStart = i + newlineLength;
if (newlineLength == 2) // skip \n next time through loop
++i;
} else if (c == '\n') {
strings.add(str.substring(lineStart, i));
lineStart = i + 1;
}
}
if (lineStart < len)
strings.add(str.substring(lineStart));
return strings;
}
}
आप अपने ही वर्ग में रखते हैं, तो बस का उपयोग कर आप क्या था:
FontMetrics fm= graphics.getFontMetrics(font);
Rectangle2D rect=fm.getStringBounds("Some Text",graphics);
कॉल wrap(String str, FontMetrics fm, int maxWidth) जो ListString एस को वापस ले जाएगा जो acco लपेटा गया है
String text="Some Text";
FontMetrics fm= graphics.getFontMetrics(font);
Rectangle2D rect=fm.getStringBounds(text,graphics);
List<String> textList=StringUtils.wrap(text, fm, int maxWidth);
संदर्भ::
मैं व्यक्तिगत रूप से उदाहरण के रूप में यह अपेक्षाकृत प्राप्त करने के लिए जल्दी हो जाता है एंड्रयू ने साबित कर दिया की तरह। हालांकि, मैंने पिछले दृष्टिकोण में इस दृष्टिकोण का उपयोग किया था http://java.sun.com/developer/onlineTraining/Media/2DText/style.html#multiple – MadProgrammer
दो विकल्पों पर कोई पेशेवर और विपक्ष? – epeleg
मैं कहूंगा कि एंड्रयू का समाधान आसान है, IMHO – MadProgrammer