在指定的矩形区域中显示字符信息

[z_j]

在指定的矩形区域中显示字符信息，要求：
1 不能超出指定的区域，即超出区域的部分需要被裁剪调
2 能够水平居中，居右，居左对齐，垂直居中，顶边对齐，底边对齐
3 字符串太长能够自动换行
这些要求在MFC中是小菜一碟，DrawText 函数就完全搞定，但在Java中，Graphics.drawString 太简陋了，需要实现这样的函数


MyDrawString(Graphics g, Rectangle rc , String s , int hFlag , int vFlag , boolean ln)


rc是指定的矩形区域
s 是要显示的字符串
hFlag ： 水平对齐标记： 0左对齐 1右对齐 2 水平居中
vFlag: 垂直方向对齐标记： 0 顶部对齐， 1底边对齐 2 垂直居中
ln: 太长是否自动换行

请大家给点提示：

[wafd]

Java 的Swing包中有专门处理你所说的那些功能的组件，根本不需要用Graphics

[z_j]

求人不如求己，我已经搞定：
public void DrawString(
Graphics2D g,
Rectangle rc,
String s,
Color bkcolor,
Color textcolor,
String FontName,
int FontSize,
boolean FontBold,
boolean FontItalic,
boolean FontUnderline,
int hAlign,
int vAlign,
boolean MultiLine)
{
if (s.trim().equals(""))
return;

if ( rc.width<=0 || rc.height<=0 ) return ;

//背景颜色
g.setColor(bkcolor);
g.fillRect(rc.x, rc.y, rc.width, rc.height);
g.setColor(textcolor); //文字颜色

LineBreakMeasurer lineMeasurer; //The LineBreakMeasurer used to line-break the paragraph.
int paragraphStart; // The index in the LineBreakMeasurer of the first character in the paragraph.
int paragraphEnd; // The index in the LineBreakMeasurer of the first character after the end of the paragraph.

Dimension size = rc.getSize();

//保存旧的剪裁区
Rectangle oc = g.getClipBounds();
//设置新得剪裁区
g.setClip(rc.x, rc.y, rc.width, rc.height);


Hashtable map = new Hashtable();
map.put(TextAttribute.FAMILY, FontName);
map.put(TextAttribute.SIZE, new Float(FontSize));
if (FontUnderline)
map.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
if (FontBold)
map.put(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD);
if (FontItalic)
map.put(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE);

AttributedString ss = new AttributedString(s, map);
AttributedCharacterIterator text = ss.getIterator();
FontRenderContext frc = new FontRenderContext(g.getTransform(), false, false);

paragraphStart = text.getBeginIndex();
paragraphEnd = text.getEndIndex();

// Create a new LineBreakMeasurer from the paragraph.
lineMeasurer = new LineBreakMeasurer(text, frc);
// Set formatting width to width of Component.

float formatWidth = (float) size.width;
float drawPosY = rc.y;

// 多行时，计算文本总高度
if (MultiLine && vAlign != Alignment.Top)
{
double gg = 0;
lineMeasurer.setPosition(paragraphStart);
while (lineMeasurer.getPosition() < paragraphEnd)
{
TextLayout layout = lineMeasurer.nextLayout(formatWidth);
gg += layout.getDescent() + layout.getLeading() + layout.getAscent();
}

if (gg < rc.height)
{
if (vAlign == Alignment.Center)
drawPosY += (rc.height - gg) / 2;
if (vAlign == Alignment.Bottom)
drawPosY += (rc.height - gg);
}

}
// Get lines from lineMeasurer until the entire
// paragraph has been displayed.
lineMeasurer.setPosition(paragraphStart);
while (lineMeasurer.getPosition() < paragraphEnd)
{
// Retrieve next layout.
TextLayout layout = lineMeasurer.nextLayout(formatWidth);
// Move y-coordinate by the ascent of the layout.
switch (vAlign)
{
case Alignment.Bottom : //底边
if (!MultiLine)
{
drawPosY += (rc.height - layout.getDescent() - layout.getLeading());
break;
}
case Alignment.Center : //居中
if (!MultiLine)
{
drawPosY += layout.getAscent() + (rc.height - layout.getAscent() - layout.getDescent() - layout.getLeading()) / 2;
break;
}
default :
drawPosY += layout.getAscent();
break;
}

float drawPosX = rc.x;
switch (hAlign)
{
case Alignment.Right : //右对齐
drawPosX = rc.x + formatWidth - layout.getAdvance();
break;
case Alignment.Center : // 居中对齐
drawPosX = rc.x + (formatWidth - layout.getAdvance()) / 2;
break;
default :
drawPosX = rc.x;
break;
}

layout.draw(g, drawPosX, drawPosY);
// Move y-coordinate in preparation for next layout.
drawPosY += layout.getDescent() + layout.getLeading();
//如果多行文本超出了显示区域，那么退出
if (drawPosY >= rc.y + rc.height)
break;

if (!MultiLine) //如果不是多行，那么退出
break;
}
//恢复旧的裁减区域
g.setClip(oc.x, oc.y, oc.width, oc.height);

}

[z_j]

其中 Alignment.Bottom =1 Alignment.Center=2 Alignment.Right=1