referencedgraphic2d.html

Geotools是一个开源的Java GIS工具包,可利用它来开发符合标准的地理信息系统。Geotools提供了OGC(Open Geospatial Consortium)规范的一个实现来作为他们的

<DT><B>Parameters:</B><DD><CODE>crs</CODE> - The new objective CRS.
<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE> - If this method do not accept the new CRS. In such case,
         this method should keep the old CRS and leaves this graphic in a consistent state.</DL>
</DD>
</DL>
<HR>

<A NAME="setEnvelope(org.opengis.spatialschema.geometry.Envelope)"><!-- --></A><H3>
setEnvelope</H3>
<PRE>
protected void <B>setEnvelope</B>(Envelope&nbsp;envelope)
                    throws TransformException</PRE>
<DL>
<DD>Set the envelope for this graphic. Subclasses should invokes this method as soon as they
 known their envelope.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html#setEnvelope(org.opengis.spatialschema.geometry.Envelope)">setEnvelope</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html" title="class in org.geotools.display.canvas">ReferencedGraphic</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE>TransformException</CODE> - if the specified envelope can't be transformed to the
         <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html#getObjectiveCRS()">objective CRS</A>.</DL>
</DD>
</DL>
<HR>

<A NAME="refresh()"><!-- --></A><H3>
refresh</H3>
<PRE>
public void <B>refresh</B>()</PRE>
<DL>
<DD>Advises that this graphic need to be repainted. The graphic will not be repainted
 immediately, but at some later time depending on the widget implementation (e.g.
 <cite>Swing</cite>). This  method can be invoked from any thread;
 it doesn't need to be the <cite>Swing</cite> thread.
 <p>
 Note that this method repaint only the area painted during the last <A HREF="../../../../org/geotools/display/canvas/GraphicPrimitive2D.html#paint(org.geotools.display.canvas.RenderingContext)">rendering</A>. If this graphic now cover a wider area, then the
 area to repaint must be specified with a call to <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic2D.html#refresh(java.awt.geom.Rectangle2D)"><CODE>refresh(Rectangle2D)</CODE></A> instead.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>refresh</CODE> in interface <CODE>Graphic</CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html#refresh()">refresh</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html" title="class in org.geotools.display.canvas">AbstractGraphic</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="refresh(java.awt.geom.Rectangle2D)"><!-- --></A><H3>
refresh</H3>
<PRE>
public void <B>refresh</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/Rectangle2D.html" title="class or interface in java.awt.geom">Rectangle2D</A>&nbsp;bounds)</PRE>
<DL>
<DD>Advises that some region need to be repainted. This graphic will not be repainted
 immediately, but at some later time depending on the widget implementation (e.g.
 <cite>Swing</cite>). This  method can be invoked from any thread;
 it doesn't need to be the <cite>Swing</cite> thread.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>bounds</CODE> - The dirty region to refreshed, in the "real world" <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html#getObjectiveCRS()">objective coordinate reference system</A>. A  value refresh everything.</DL>
</DD>
</DL>
<HR>

<A NAME="zoomChanged(java.awt.geom.AffineTransform)"><!-- --></A><H3>
zoomChanged</H3>
<PRE>
protected void <B>zoomChanged</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/geom/AffineTransform.html" title="class or interface in java.awt.geom">AffineTransform</A>&nbsp;change)</PRE>
<DL>
<DD>Invoked every time the <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getScale()">canvas scale</A> changed.
 The default implementation updates the display bounds
 as below:

 <ul>
   <li><p>Since the display bounds is express in terms of
       <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayCRS()">display CRS</A> and since the display CRS
       is scale-dependent, a scale change implies a display
       bounds change as well.</p></li>
   <li><p>Since the display bounds may be clipped to the
       <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#getDisplayBounds()">canvas bounds</A>, a scale change may
       bring some new area inside the canvas bounds. This new area may need to be rendered,
       so we need to conservatively add it to this graphic display bounds.</p></li>
 </ul>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>change</CODE> - The zoom <strong>change</strong> in <strong>Java2D</strong> coordinate
        reference system (<A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayCRS()">display CRS</A>),
        or  if unknow. If , then this graphic will be fully redrawn
        during the next rendering.</DL>
</DD>
</DL>
<HR>

<A NAME="clearCache()"><!-- --></A><H3>
clearCache</H3>
<PRE>
protected void <B>clearCache</B>()</PRE>
<DL>
<DD>Clears all cached data.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#clearCache()">clearCache</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/DisplayObject.html" title="class in org.geotools.display.canvas">DisplayObject</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/display/canvas/DisplayObject.html#dispose()"><CODE>DisplayObject.dispose()</CODE></A></DL>
</DD>
</DL>
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