style.html

JSP中文介绍,对于菜鸟有用

You can create a <CODE>Font</CODE> object from a transform
object that provides information on how to
rotate, scale, move, or shear the font. This next example
uses a shear transformation to draw slanted text.  First, the
string is drawn without the transform, and then it is drawn
in a different location with it. Here is the complete
<A HREF="./Code/StillLife.java">StillLife.java</A> source code. 
<P>
<BLOCKQUOTE>
<IMG SRC="./Art/StillLife.gif">
</BLOCKQUOTE>
<P>

<PRE>
  int w = getSize().width;
  int h = getSize().height;

//Create transforms
  AffineTransform at = new AffineTransform();
  at.setToTranslation(30, 50);
  AffineTransform fontAT = new AffineTransform();
  fontAT.shear(0.2, 0.0);

//Create fonts and text layouts
  FontRenderContext frc = g2.getFontRenderContext();
  Font theFont = new Font(&quot;Times&quot;, Font.BOLD, w/25);
  String s = new String(&quot;Still Life with Text&quot;);
  TextLayout tstring = new TextLayout(s, theFont, frc);

  Font theDerivedFont = theFont.deriveFont(fontAT);
  String str = new String(&quot;Still Life with Slanted Text&quot;);
  TextLayout tstring2 = new TextLayout(str, 
			theDerivedFont, frc);

//Draw regular string
  g2.setColor(Color.blue);
  g2.transform(at);
  tstring.draw(g2, (float)0, (float)0);

//Draw string with shear transformation on the font
  g2.setColor(Color.green);
  g2.transform(at);
  tstring2.draw(g2, (float)0, (float)0);
</PRE>


<A NAME="image"></A>
<H3>Filling a Clipping Area with an Image</H3>

This next example creates a clipping area from the text string 
<I>The Starry Night</I>, and uses Vincent van Gogh's painting,  
<I>The Starry Night</I>, to fill the clipping area. Here is the
complete <A HREF="./Code/Starry.java">Starry.java</A> source code.
<P>
<IMG SRC="./Art/starry.gif" ALIGN=LEFT ALT="The Starry Night by Vincent van Gogh">
The example code creates a text layout with 
the string <I>The Starry Night</I> in Times Bold. Next, it 
gets the width of the <CODE>TextLayout</CODE> bounds.  
The <A HREF="other.html#bounds">bounds</A> 
contains all the pixels the layout can draw. 
<P>
Then, it gets the outline of
the text layout and uses the width of the bounds to calculate the 
X and Y positions for the origins of the layout. The outline is  
used to create a <CODE>Shape</CODE> object, and a <CODE>Rectangle</CODE>
object is created from the bounds of the <CODE>Shape</CODE> object.
<P>
At this point, the graphics context color is set to blue
and the <CODE>Shape</CODE> object is drawn into the graphics context.
The image and code segment below show what has happened
so far.
<BR CLEAR=ALL>
<P>
<BLOCKQUOTE>
<IMG SRC="./Art/StarryShape.gif">
</BLOCKQUOTE>

<PRE>
FontRenderContext frc = g2.getFontRenderContext();
Font f = new Font(&quot;Times&quot;,Font.BOLD,w/10);
String s = new String(&quot;The Starry Night&quot;);
TextLayout tl = new TextLayout(s, f, frc);
float sw = (float) tl.getBounds().getWidth();
Shape shape = tl.getOutline(null,w/2-sw/2,h/4);
Rectangle r = shape.getBounds();
g2.setColor(Color.blue);
g2.draw(shape);
</PRE>

<P>
Lastly, a clipping area is set on the graphics context using
the <CODE>Shape</CODE> object, and the <CODE>starry.gif</CODE> 
image is drawn into the clipping area starting at the lower-left 
corner of the <CODE>Rectangle</CODE> object (<CODE>r.x</CODE> and 
<CODE>r.y</CODE>) and filling the full height and width of the 
Rectangle object.
<P>
<BLOCKQUOTE>
<IMG SRC="./Art/Starry.gif">
</BLOCKQUOTE>

<PRE>
g2.setClip(shape);
g2.drawImage(img, r.x, r.y, r.width, r.height, this);
</PRE>


<A NAME="lines"></A>
<H3>Filling a Clipping Area with Lines</H3>

For a slightly different effect, this next example creates a clipping 
area from the text layout <I>By</I>, fills the clipping area with blue, 
and draws yellow lines across the clipping area over the blue fill.  
Information returned by the <CODE>TextLayout</CODE>
<A HREF="other.html#ascent"><CODE>getAscent</CODE></A> method 
is used to position the line on the display.
<P>
Here is the  complete
<A HREF="./Code/Clipping.java">Clipping.java</A> source code.
<P>
<BLOCKQUOTE>
<IMG SRC="./Art/Clipping.gif">
</BLOCKQUOTE>

<PRE>
FontRenderContext frc = g2.getFontRenderContext();
Font f = new Font(&quot;Helvetica&quot;,Font.BOLD,w/8);
String s = new String(&quot;By&quot;);
TextLayout tl = new TextLayout(s, f, frc);
float sw = (float) tl.getBounds().getWidth();
Shape shape = tl.getOutline(null,w/2-sw/2,h/2);
g2.setClip(shape);
g2.setColor(Color.blue);
g2.fill(shape.getBounds());
g2.setColor(Color.yellow);
for (int j = shape.getBounds().y; 
    j &lt; shape.getBounds().y + 
    shape.getBounds ().height; j=j+3) {
  Line2D line = new Line2D.Float( 0.0f, (float) j, 
			(float) w, (float) j);
  g2.draw(line);
}
</PRE>


<A NAME="characters"></A>
<H3>Filling a Clipping Area with Characters</H3>

This next example creates a clipping area from the text
layout <I>Vincent van Gogh</I>, fills it with blue, and
draws white asterisks (*) into the clipping area over the
blue fill to give the effect of white stars in a blue sky.
Here is the complete
<A HREF="./Code/TextClipping.java">TextClipping.java</A> source code.
<P>
<BLOCKQUOTE>
<IMG SRC="./Art/Vincent.gif">
</BLOCKQUOTE>

<PRE>
FontRenderContext frc = g2.getFontRenderContext();
Font f = 
  new Font(&quot;Times New Roman Bold&quot;,Font.PLAIN,w/8);
String s = new String(&quot;Vincent van Gogh&quot;);
TextLayout tl = new TextLayout(s, f, frc);
float sw = (float) tl.getBounds().getWidth();
Shape shape = tl.getOutline(null,w/2-sw/2,h-h/6);
g2.setClip(shape);
g2.setColor(Color.blue);
g2.fill(shape.getBounds());
g2.setColor(Color.white);
f = new Font(&quot;Helvetica&quot;,Font.BOLD,10);
tl = new TextLayout(&quot;+&quot;, f, frc);
sw = (float) tl.getBounds().getWidth();

Rectangle r = shape.getBounds();
int x = r.x;
int y = r.y;
while ( y &lt; (r.y + r.height+(int) tl.getAscent()) ) {
      tl.draw(g2, x, y);
      if ((x += (int) sw) &gt; (r.x+r.width)) {
      x = r.x;
      y += (int) tl.getAscent();
      }
}
</PRE>

	
<A NAME="replace"></A>
<H3>Text Attributes and Replacement Graphics</H3>

The <CODE>TextAttribute</CODE> class defines text attributes so
you can define an <CODE>Attributed</CODE> string with text
attributes. This next example uses text attributes to define
the font and a character replacement image for the
<CODE>java.awt.text.AttributedString</CODE> that contains the
text <I>The Starry Night</I>. An <CODE>ImageGraphicAttribute</CODE> 
is created from an image to do this. 
Here is the complete 
<A HREF="./Code/MakeImage.java">MakeImage.java</A> source code.

<BLOCKQUOTE>
<IMG SRC="./Art/CharReplace.gif">
</BLOCKQUOTE>

<PRE>
public void paint(Graphics g) {
  Graphics2D g2;
  g2 = (Graphics2D) g;
  g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
  g2.setRenderingHint(RenderingHints.KEY_RENDERING,
                RenderingHints.VALUE_RENDER_QUALITY);

  Font f = new Font(&quot;Times&quot;,Font.BOLD, 24);
  AttributedString ats = 
    new AttributedString(&quot;The  Starry  Night&quot;);
  ImageGraphicAttribute iga = 
    new ImageGraphicAttribute(img, 
    (int) BOTTOM_ALIGNMENT);
  ats.addAttribute(
    TextAttribute.CHAR_REPLACEMENT, iga, 4, 5);
  ats.addAttribute(
    TextAttribute.CHAR_REPLACEMENT, iga, 11, 12);
  ats.addAttribute(TextAttribute.FONT, f, 0, 18);
  AttributedCharacterIterator iter = ats.getIterator();

  FontRenderContext frc = g2.getFontRenderContext();
  tl = new TextLayout(iter, frc);
  g2.setColor(Color.red);
  tl.draw(g2, (float)20, (float)30);
}
</PRE>


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