我希望在JLabel中垂直显示文本，在底部显示第一个字母，在顶部显示最后一个字母。这可能吗？
答案 0 :(得分：7)
我找到了这个页面：http://www.java2s.com/Tutorial/Java/0240__Swing/VerticalLabelUI.htm当我需要这样做时。
我不知道你是否希望这些字母彼此“站立”或全部旋转。
/*
* The contents of this file are subject to the Sapient Public License
* Version 1.0 (the "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
* http://carbon.sf.net/License.html.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The Original Code is The Carbon Component Framework.
*
* The Initial Developer of the Original Code is Sapient Corporation
*
* Copyright (C) 2003 Sapient Corporation. All Rights Reserved.
*/
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import javax.swing.Icon;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.plaf.basic.BasicLabelUI;
/**
* This is the template for Classes.
*
*
* @since carbon 1.0
* @author Greg Hinkle, January 2002
* @version $Revision: 1.4 $($Author: dvoet $ / $Date: 2003/05/05 21:21:27 $)
* @copyright 2002 Sapient
*/
public class VerticalLabelUI extends BasicLabelUI {
static {
labelUI = new VerticalLabelUI(false);
}
protected boolean clockwise;
public VerticalLabelUI(boolean clockwise) {
super();
this.clockwise = clockwise;
}
public Dimension getPreferredSize(JComponent c) {
Dimension dim = super.getPreferredSize(c);
return new Dimension( dim.height, dim.width );
}
private static Rectangle paintIconR = new Rectangle();
private static Rectangle paintTextR = new Rectangle();
private static Rectangle paintViewR = new Rectangle();
private static Insets paintViewInsets = new Insets(0, 0, 0, 0);
public void paint(Graphics g, JComponent c) {
JLabel label = (JLabel)c;
String text = label.getText();
Icon icon = (label.isEnabled()) ? label.getIcon() : label.getDisabledIcon();
if ((icon == null) && (text == null)) {
return;
}
FontMetrics fm = g.getFontMetrics();
paintViewInsets = c.getInsets(paintViewInsets);
paintViewR.x = paintViewInsets.left;
paintViewR.y = paintViewInsets.top;
// Use inverted height & width
paintViewR.height = c.getWidth() - (paintViewInsets.left + paintViewInsets.right);
paintViewR.width = c.getHeight() - (paintViewInsets.top + paintViewInsets.bottom);
paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;
String clippedText =
layoutCL(label, fm, text, icon, paintViewR, paintIconR, paintTextR);
Graphics2D g2 = (Graphics2D) g;
AffineTransform tr = g2.getTransform();
if (clockwise) {
g2.rotate( Math.PI / 2 );
g2.translate( 0, - c.getWidth() );
} else {
g2.rotate( - Math.PI / 2 );
g2.translate( - c.getHeight(), 0 );
}
if (icon != null) {
icon.paintIcon(c, g, paintIconR.x, paintIconR.y);
}
if (text != null) {
int textX = paintTextR.x;
int textY = paintTextR.y + fm.getAscent();
if (label.isEnabled()) {
paintEnabledText(label, g, clippedText, textX, textY);
} else {
paintDisabledText(label, g, clippedText, textX, textY);
}
}
g2.setTransform( tr );
}
}
答案 1 :(得分：5)
你可以通过搞乱paint命令来做到这一点，如下所示：
public class JVertLabel extends JComponent{
private String text;
public JVertLabel(String s){
text = s;
}
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.rotate(Math.toRadians(270.0));
g2d.drawString(text, 0, 0);
}
}
答案 2 :(得分：5)
在JLabel中垂直显示文本的另一种方法是在JLabel的文本中使用HTML标记。例如，setText("<HTML>H<br>E<br>L<br>L<br>O</HTML>");会将文本设置为
^ h
Ë
大号
大号
Ò
答案 3 :(得分：2)
您也可以使用SwingX API
自下而上：
JXLabel label = new JXLabel("MY TEXT");
label.setTextRotation(3 * Math.PI / 2);
从上到下：
JXLabel label = new JXLabel("MY TEXT");
label.setTextRotation(Math.PI / 2);
答案 4 :(得分：1)
以下是另一种解决方案：
http://www.macdevcenter.com/pub/a/mac/2002/03/22/vertical_text.html
突出显示Javadoc中的注释：
中文/日文/韩文脚本有特殊规则 垂直绘制，永远不应旋转
有关可视化示例，请参阅文章。
这是主要的课程JTextIcon.java，以防文章从网站上删除：
mywebsite.com/register免费提供用于任何目的。
还有一个/**
VTextIcon is an Icon implementation which draws a short string vertically.
It's useful for JTabbedPanes with LEFT or RIGHT tabs but can be used in any
component which supports Icons, such as JLabel or JButton
You can provide a hint to indicate whether to rotate the string
to the left or right, or not at all, and it checks to make sure
that the rotation is legal for the given string
(for example, Chinese/Japanese/Korean scripts have special rules when
drawn vertically and should never be rotated)
*/
public class VTextIcon implements Icon, PropertyChangeListener {
String fLabel;
String[] fCharStrings; // for efficiency, break the fLabel into one-char strings to be passed to drawString
int[] fCharWidths; // Roman characters should be centered when not rotated (Japanese fonts are monospaced)
int[] fPosition; // Japanese half-height characters need to be shifted when drawn vertically
int fWidth, fHeight, fCharHeight, fDescent; // Cached for speed
int fRotation;
Component fComponent;
static final int POSITION_NORMAL = 0;
static final int POSITION_TOP_RIGHT = 1;
static final int POSITION_FAR_TOP_RIGHT = 2;
public static final int ROTATE_DEFAULT = 0x00;
public static final int ROTATE_NONE = 0x01;
public static final int ROTATE_LEFT = 0x02;
public static final int ROTATE_RIGHT = 0x04;
/**
* Creates a <code>VTextIcon</code> for the specified <code>component</code>
* with the specified <code>label</code>.
* It sets the orientation to the default for the string
* @see #verifyRotation
*/
public VTextIcon(Component component, String label) {
this(component, label, ROTATE_DEFAULT);
}
/**
* Creates a <code>VTextIcon</code> for the specified <code>component</code>
* with the specified <code>label</code>.
* It sets the orientation to the provided value if it's legal for the string
* @see #verifyRotation
*/
public VTextIcon(Component component, String label, int rotateHint) {
fComponent = component;
fLabel = label;
fRotation = verifyRotation(label, rotateHint);
calcDimensions();
fComponent.addPropertyChangeListener(this);
}
/**
* sets the label to the given string, updating the orientation as needed
* and invalidating the layout if the size changes
* @see #verifyRotation
*/
public void setLabel(String label) {
fLabel = label;
fRotation = verifyRotation(label, fRotation); // Make sure the current rotation is still legal
recalcDimensions();
}
/**
* Checks for changes to the font on the fComponent
* so that it can invalidate the layout if the size changes
*/
public void propertyChange(PropertyChangeEvent e) {
String prop = e.getPropertyName();
if("font".equals(prop)) {
recalcDimensions();
}
}
/**
* Calculates the dimensions. If they've changed,
* invalidates the component
*/
void recalcDimensions() {
int wOld = getIconWidth();
int hOld = getIconHeight();
calcDimensions();
if (wOld != getIconWidth() || hOld != getIconHeight())
fComponent.invalidate();
}
void calcDimensions() {
FontMetrics fm = fComponent.getFontMetrics(fComponent.getFont());
fCharHeight = fm.getAscent() + fm.getDescent();
fDescent = fm.getDescent();
if (fRotation == ROTATE_NONE) {
int len = fLabel.length();
char data[] = new char[len];
fLabel.getChars(0, len, data, 0);
// if not rotated, width is that of the widest char in the string
fWidth = 0;
// we need an array of one-char strings for drawString
fCharStrings = new String[len];
fCharWidths = new int[len];
fPosition = new int[len];
char ch;
for (int i = 0; i < len; i++) {
ch = data[i];
fCharWidths[i] = fm.charWidth(ch);
if (fCharWidths[i] > fWidth)
fWidth = fCharWidths[i];
fCharStrings[i] = new String(data, i, 1);
// small kana and punctuation
if (sDrawsInTopRight.indexOf(ch) >= 0) // if ch is in sDrawsInTopRight
fPosition[i] = POSITION_TOP_RIGHT;
else if (sDrawsInFarTopRight.indexOf(ch) >= 0)
fPosition[i] = POSITION_FAR_TOP_RIGHT;
else
fPosition[i] = POSITION_NORMAL;
}
// and height is the font height * the char count, + one extra leading at the bottom
fHeight = fCharHeight * len + fDescent;
}
else {
// if rotated, width is the height of the string
fWidth = fCharHeight;
// and height is the width, plus some buffer space
fHeight = fm.stringWidth(fLabel) + 2*kBufferSpace;
}
}
/**
* Draw the icon at the specified location. Icon implementations
* may use the Component argument to get properties useful for
* painting, e.g. the foreground or background color.
*/
public void paintIcon(Component c, Graphics g, int x, int y) {
// We don't insist that it be on the same Component
g.setColor(c.getForeground());
g.setFont(c.getFont());
if (fRotation == ROTATE_NONE) {
int yPos = y + fCharHeight;
for (int i = 0; i < fCharStrings.length; i++) {
// Special rules for Japanese - "half-height" characters (like ya, yu, yo in combinations)
// should draw in the top-right quadrant when drawn vertically
// - they draw in the bottom-left normally
int tweak;
switch (fPosition[i]) {
case POSITION_NORMAL:
// Roman fonts should be centered. Japanese fonts are always monospaced.
g.drawString(fCharStrings[i], x+((fWidth-fCharWidths[i])/2), yPos);
break;
case POSITION_TOP_RIGHT:
tweak = fCharHeight/3; // Should be 2, but they aren't actually half-height
g.drawString(fCharStrings[i], x+(tweak/2), yPos-tweak);
break;
case POSITION_FAR_TOP_RIGHT:
tweak = fCharHeight - fCharHeight/3;
g.drawString(fCharStrings[i], x+(tweak/2), yPos-tweak);
break;
}
yPos += fCharHeight;
}
}
else if (fRotation == ROTATE_LEFT) {
g.translate(x+fWidth,y+fHeight);
((Graphics2D)g).rotate(-NINETY_DEGREES);
g.drawString(fLabel, kBufferSpace, -fDescent);
((Graphics2D)g).rotate(NINETY_DEGREES);
g.translate(-(x+fWidth),-(y+fHeight));
}
else if (fRotation == ROTATE_RIGHT) {
g.translate(x,y);
((Graphics2D)g).rotate(NINETY_DEGREES);
g.drawString(fLabel, kBufferSpace, -fDescent);
((Graphics2D)g).rotate(-NINETY_DEGREES);
g.translate(-x,-y);
}
}
/**
* Returns the icon's width.
*
* @return an int specifying the fixed width of the icon.
*/
public int getIconWidth() {
return fWidth;
}
/**
* Returns the icon's height.
*
* @return an int specifying the fixed height of the icon.
*/
public int getIconHeight() {
return fHeight;
}
/**
verifyRotation
returns the best rotation for the string (ROTATE_NONE, ROTATE_LEFT, ROTATE_RIGHT)
This is public static so you can use it to test a string without creating a VTextIcon
from http://www.unicode.org/unicode/reports/tr9/tr9-3.html
When setting text using the Arabic script in vertical lines,
it is more common to employ a horizontal baseline that
is rotated by 90� counterclockwise so that the characters
are ordered from top to bottom. Latin text and numbers
may be rotated 90� clockwise so that the characters
are also ordered from top to bottom.
Rotation rules
- Roman can rotate left, right, or none - default right (counterclockwise)
- CJK can't rotate
- Arabic must rotate - default left (clockwise)
from the online edition of _The Unicode Standard, Version 3.0_, file ch10.pdf page 4
Ideographs are found in three blocks of the Unicode Standard...
U+4E00-U+9FFF, U+3400-U+4DFF, U+F900-U+FAFF
Hiragana is U+3040-U+309F, katakana is U+30A0-U+30FF
from http://www.unicode.org/unicode/faq/writingdirections.html
East Asian scripts are frequently written in vertical lines
which run from top-to-bottom and are arrange columns either
from left-to-right (Mongolian) or right-to-left (other scripts).
Most characters use the same shape and orientation when displayed
horizontally or vertically, but many punctuation characters
will change their shape when displayed vertically.
Letters and words from other scripts are generally rotated through
ninety degree angles so that they, too, will read from top to bottom.
That is, letters from left-to-right scripts will be rotated clockwise
and letters from right-to-left scripts counterclockwise, both
through ninety degree angles.
Unlike the bidirectional case, the choice of vertical layout
is usually treated as a formatting style; therefore,
the Unicode Standard does not define default rendering behavior
for vertical text nor provide directionality controls designed to override such behavior
*/
public static int verifyRotation(String label, int rotateHint) {
boolean hasCJK = false;
boolean hasMustRotate = false; // Arabic, etc
int len = label.length();
char data[] = new char[len];
char ch;
label.getChars(0, len, data, 0);
for (int i = 0; i < len; i++) {
ch = data[i];
if ((ch >= '\u4E00' && ch <= '\u9FFF') ||
(ch >= '\u3400' && ch <= '\u4DFF') ||
(ch >= '\uF900' && ch <= '\uFAFF') ||
(ch >= '\u3040' && ch <= '\u309F') ||
(ch >= '\u30A0' && ch <= '\u30FF') )
hasCJK = true;
if ((ch >= '\u0590' && ch <= '\u05FF') || // Hebrew
(ch >= '\u0600' && ch <= '\u06FF') || // Arabic
(ch >= '\u0700' && ch <= '\u074F') ) // Syriac
hasMustRotate = true;
}
// If you mix Arabic with Chinese, you're on your own
if (hasCJK)
return DEFAULT_CJK;
int legal = hasMustRotate ? LEGAL_MUST_ROTATE : LEGAL_ROMAN;
if ((rotateHint & legal) > 0)
return rotateHint;
// The hint wasn't legal, or it was zero
return hasMustRotate ? DEFAULT_MUST_ROTATE : DEFAULT_ROMAN;
}
// The small kana characters and Japanese punctuation that draw in the top right quadrant:
// small a, i, u, e, o, tsu, ya, yu, yo, wa (katakana only) ka ke
static final String sDrawsInTopRight =
"\u3041\u3043\u3045\u3047\u3049\u3063\u3083\u3085\u3087\u308E" + // hiragana
"\u30A1\u30A3\u30A5\u30A7\u30A9\u30C3\u30E3\u30E5\u30E7\u30EE\u30F5\u30F6"; // katakana
static final String sDrawsInFarTopRight = "\u3001\u3002"; // comma, full stop
static final int DEFAULT_CJK = ROTATE_NONE;
static final int LEGAL_ROMAN = ROTATE_NONE | ROTATE_LEFT | ROTATE_RIGHT;
static final int DEFAULT_ROMAN = ROTATE_RIGHT;
static final int LEGAL_MUST_ROTATE = ROTATE_LEFT | ROTATE_RIGHT;
static final int DEFAULT_MUST_ROTATE = ROTATE_LEFT;
static final double NINETY_DEGREES = Math.toRadians(90.0);
static final int kBufferSpace = 5;
}
课程，可让您使用另一个图标（此处未给出）撰写垂直文本
根据文章中的评论，在CompositeIcon方法中添加抗锯齿：
paintIcon