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📄 creating and deriving fonts.htm

📁 一个关于java字体设计的程序!
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<BODY bgColor=#ffffff link=#000099><B><FONT size=-1>The Java</FONT><SUP><FONT 
size=-2>TM</FONT></SUP> <FONT size=-1>Tutorial</FONT></B> <BR>
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NATURALSIZEFLAG="3"> <BR><FONT size=-1><B>Trail</B>: 2D Graphics 
<BR><B>Lesson</B>: Working with Text and Fonts </FONT>
<H2>Creating and Deriving Fonts </H2>
<BLOCKQUOTE>You can display a text string with any font available on your 
  system in any size and style that you choose. To determine what fonts are 
  available on your system, you can call the 
  <CODE>GraphicsEnvironment.getAvailableFontFamilyNames</CODE> method. This 
  method returns an array of strings that contains the family names of the 
  available fonts. Any of the strings, along with a size and style argument, can 
  be used to create a new <CODE>Font</CODE> object. After creating a 
  <CODE>Font</CODE> object, you can reset its font family name, size or style to 
  create a custom font. </BLOCKQUOTE>
<H3>Example: FontSelection</H3>
<BLOCKQUOTE>The following applet allows you to change the font, size, and 
  style of the displayed text. 
  <P>
  <P>
  <CENTER><A 
  href="http://java.sun.com/docs/books/tutorial/2d/textandfonts/FontSelectionDemo.html" 
  target=_blank><IMG align=bottom alt="Click this figure to run the applet." 
  height=257 src="Creating and Deriving Fonts.files/fontselection.gif" width=480 
  NATURALSIZEFLAG="3"></A><BR><EM>This is a picture of the applet's GUI. To run 
  the applet, click the picture. The applet will appear in a new browser 
  window.</EM></CENTER>
  <P></P>The complete code for this applet is in <A 
  href="http://java.sun.com/docs/books/tutorial/2d/textandfonts/example-1dot2/FontSelection.java" 
  target=_blank><FONT color=#bb000f><CODE>FontSelection.java</CODE></FONT></A><A 
  href="http://java.sun.com/docs/books/tutorial/2d/textandfonts/example-1dot2/FontSelection.java" 
  target=_blank><IMG align=absMiddle alt=" (in a .java source file)" border=0 
  height=11 src="Creating and Deriving Fonts.files/sourceIcon.gif" 
  width=11></A>. 
  <P>The <CODE>getAvailableFontFamilyNames</CODE> method of 
  <CODE>GraphicsEnvironment</CODE> returns the font family names of the fonts 
  available on your system. 
  <BLOCKQUOTE><PRE>GraphicsEnvironment gEnv =
    GraphicsEnvironment.getLocalGraphicsEnvironment();
String envfonts[] = gEnv.getAvailableFontFamilyNames();
Vector vector = new Vector();
for ( int i = 1; i &lt; envfonts.length; i++ ) {
   vector.addElement(envfonts[i]);
}
</PRE></BLOCKQUOTE>The initial <CODE>Font</CODE> object is created with style 
  <CODE>Font.PLAIN</CODE> and size 10. The other available styles are ITALIC, 
  BOLD and BOLD+ITALIC. 
  <BLOCKQUOTE><PRE>Font thisFont;
...

thisFont = new Font("Arial", Font.PLAIN, 10);
</PRE></BLOCKQUOTE>A new <CODE>Font</CODE> is created from the specified font 
  name, style and size. 
  <BLOCKQUOTE><PRE>public void changeFont(String f, int st, String si){
  Integer newSize = new Integer(si);
  int size = newSize.intValue();
  thisFont = new Font(f, st, size);
  repaint();
}
</PRE></BLOCKQUOTE>To use the same font family but change one or both of the 
  style and size attributes, you can call one of the <CODE>deriveFont</CODE> 
  methods. 
  <P>To control the font used to render text, you set the font attribute in the 
  <CODE>Graphics2D</CODE> context before rendering. The font attribute is set by 
  passing a <CODE>Font</CODE> object to the <CODE>setFont</CODE> method. In this 
  example, the font attribute is set to the newly constructed <CODE>Font</CODE> 
  object and then the string is drawn in the center of the Component using the 
  specified font. In the <CODE>paint</CODE> method, the font attribute of the 
  <CODE>Graphics2D</CODE> context is set to the new <CODE>Font</CODE>. The 
  string is drawn in the middle of the component with the new font. 
  <BLOCKQUOTE><PRE>g2.setFont(thisFont);
String change = "Pick a font, size, and style to change me";
FontMetrics metrics = g2.getFontMetrics();
int width = metrics.stringWidth( change );
int height = metrics.getHeight();
g2.drawString( change, w/2-width/2, h/2-height/2 );
</PRE></BLOCKQUOTE>
  <BLOCKQUOTE>
    <HR>
    <STRONG>Note:</STRONG>&nbsp; Due to bug # <A 
    href="http://developer.java.sun.com/developer/bugParade/bugs/4155852.html" 
    target=_blank><FONT color=#009bbb>4155852</FONT></A><A 
    href="http://developer.java.sun.com/developer/bugParade/bugs/4155852.html" 
    target=_blank><IMG align=absMiddle alt=" (outside of the tutorial)" border=0 
    height=11 src="Creating and Deriving Fonts.files/otherIcon.gif" 
    width=11></A>, FontSelection might not work properly for all font names 
    returned from the call to getFontFamilyNames. The sample might not respond 
    to changes in size or style and the text might not show up at all when some 
    fontnames are chosen. In general, Courier and Helvetica work fine. In the 
    meantime, check back periodically to see if these problems have been fixed. 
    <HR>
  </BLOCKQUOTE>
  <P></P></BLOCKQUOTE><IMG align=bottom alt="" height=8 
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