使用Java,是否有任何内置的方式来渲染文本,使其仅限于graphics2D
对象上的矩形?
我知道我可以使用Graphics2D.drawString
,但它只绘制一行文字。
我也知道我可以用
FontMetrics fm= graphics.getFontMetrics(font);
Rectangle2D rect=fm.getStringBounds("Some Text",graphics);
在某些Font font
对象上使用一些Graphics2D graphics
渲染时获取有关字符串边界的信息。
所以我可以开始循环,打破我的字符串等等,迫使它适合某个矩形。
但我更不愿意写那些......
有没有现成的功能可以帮我吗?
我写了一个可以提供帮助的小功能。 447是可用宽度,您可以从所需宽度获得以呈现文本。
private void drawTextUgly(String text, FontMetrics textMetrics, Graphics2D g2)
{
// Ugly code to wrap text
int lineHeight = textMetrics.getHeight();
String textToDraw = text;
String[] arr = textToDraw.split(" ");
int nIndex = 0;
int startX = 319;
int startY = 113;
while ( nIndex < arr.length )
{
String line = arr[nIndex++];
while ( ( nIndex < arr.length ) && (textMetrics.stringWidth(line + " " + arr[nIndex]) < 447) )
{
line = line + " " + arr[nIndex];
nIndex++;
}
GraphicsUtility.drawString(g2, line, startX, startY);
startY = startY + lineHeight;
}
}
这可能是您正在寻找的:
string U替LS.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;
}
}
你把它放在自己的课堂上,然后简单地用你所拥有的:
FontMetrics fm= graphics.getFontMetrics(font);
Rectangle2D rect=fm.getStringBounds("Some Text",graphics);
调用wrap(String str, FontMetrics fm, int maxWidth)
,它将返回List
的String
,这些maxWidth
已经相应地包裹在你的Rectangle2D
中,这将是文本将放入的String text="Some Text";
FontMetrics fm= graphics.getFontMetrics(font);
Rectangle2D rect=fm.getStringBounds(text,graphics);
List<String> textList=StringUtils.wrap(text, fm, int maxWidth);
的宽度:
http://www.java2s.com/Code/Java/2D-Graphics-GUI/WrapstringaccordingtoFontMetrics.htm
参考:
LabelRenderTest
请参阅this answer中的 private List<String> wrap(String txt, FontMetrics fm, int maxWidth){
StringTokenizer st = new StringTokenizer(txt) ;
List<String> list = new ArrayList<String>();
String line = "";
String lineBeforeAppend = "";
while (st.hasMoreTokens()){
String seg = st.nextToken();
lineBeforeAppend = line;
line += seg + " ";
int width = fm.stringWidth(line);
if(width < maxWidth){
continue;
}else { //new Line.
list.add(lineBeforeAppend);
line = seg + " ";
}
}
//the remaining part.
if(line.length() > 0){
list.add(line);
}
return list;
}
来源。它使用HTML / CSS,使用CSS设置主体宽度,从而自动换行。
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