bufferedcanvas2d.html

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             This transform is usually provided by <A HREF="../../../../org/geotools/gui/swing/ZoomPane.html#zoom"><CODE>ZoomPane.zoom</CODE></A>.</DL>
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<A NAME="repaint(org.opengis.go.display.primitive.Graphic, java.awt.geom.Rectangle2D, java.awt.Rectangle)"><!-- --></A><H3>
repaint</H3>
<PRE>
public void <B>repaint</B>(Graphic&nbsp;graphic,
                    <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;objectiveArea,
                    <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Rectangle.html" title="class or interface in java.awt">Rectangle</A>&nbsp;displayArea)</PRE>
<DL>
<DD>Advises that at least a portion of this canvas need to be repainted. This canvas will not be
 repainted immediately, but at some later time depending on the widget implementation. This
  method can be invoked from any thread; it doesn't need to be the
 <cite>Swing</cite> thread.
 <p>
 Usually only one of  and  arguments is provided. If
 both arguments are non-null, then this method repaint the <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Rectangle.html#add(int, int)" title="class or interface in java.awt">union</A>
 of those rectangles in display coordinates.
 <p>
 This method is invoked by <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic2D.html#refresh()"><CODE>ReferencedGraphic2D.refresh()</CODE></A> and usually don't need to be
 invoked directly.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#repaint(org.opengis.go.display.primitive.Graphic, java.awt.geom.Rectangle2D, java.awt.Rectangle)">repaint</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html" title="class in org.geotools.display.canvas">ReferencedCanvas2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>graphic</CODE> - The graphic to repaint, or  if unknown.<DD><CODE>objectiveArea</CODE> - The dirty region to repaint in terms of
        <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getObjectiveCRS()">objective CRS</A>, or .<DD><CODE>displayArea</CODE> - The dirty region to repaint in terms of
        <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayCRS()">display CRS</A>, or .</DL>
</DD>
</DL>
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<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 when the <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#objectiveToDisplay">objective to display transform</A> changed.
 This method updates cached informations like the envelope in every graphics.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#zoomChanged(java.awt.geom.AffineTransform)">zoomChanged</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html" title="class in org.geotools.display.canvas">ReferencedCanvas2D</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>change</CODE> - The zoom <strong>change</strong> in terms of <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayCRS()">display CRS</A>, or  if unknown. If , then all graphics will
        be fully redrawn during the next rendering (i.e. all offscreen buffers are flushed).<DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic2D.html#zoomChanged(java.awt.geom.AffineTransform)"><CODE>ReferencedGraphic2D.zoomChanged(java.awt.geom.AffineTransform)</CODE></A></DL>
</DD>
</DL>
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<A NAME="getOffscreenBuffered(double)"><!-- --></A><H3>
getOffscreenBuffered</H3>
<PRE>
public <A HREF="../../../../org/geotools/display/canvas/ImageType.html" title="class in org.geotools.display.canvas">ImageType</A> <B>getOffscreenBuffered</B>(double&nbsp;zOrder)</PRE>
<DL>
<DD>Returns the offscreen buffer type for the given z-order.
 This is the value of the  argument given to the last call to
 <A HREF="../../../../org/geotools/display/canvas/BufferedCanvas2D.html#setOffscreenBuffered(double, double, org.geotools.display.canvas.ImageType)"><CODE>setOffscreenBuffered(...)</CODE></A> for a range that contains
 the supplied  value.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>zOrder</CODE> - The z-order to query.
<DT><B>Returns:</B><DD>One of <A HREF="../../../../org/geotools/display/canvas/ImageType.html#NONE"><CODE>ImageType.NONE</CODE></A>, <A HREF="../../../../org/geotools/display/canvas/ImageType.html#VOLATILE"><CODE>ImageType.VOLATILE</CODE></A> or
         <A HREF="../../../../org/geotools/display/canvas/ImageType.html#BUFFERED"><CODE>ImageType.BUFFERED</CODE></A> enumeration.</DL>
</DD>
</DL>
<HR>

<A NAME="setOffscreenBuffered(double, double, org.geotools.display.canvas.ImageType)"><!-- --></A><H3>
setOffscreenBuffered</H3>
<PRE>
public void <B>setOffscreenBuffered</B>(double&nbsp;lower,
                                 double&nbsp;upper,
                                 <A HREF="../../../../org/geotools/display/canvas/ImageType.html" title="class in org.geotools.display.canvas">ImageType</A>&nbsp;type)</PRE>
<DL>
<DD>Enables or disables the use of offscreen buffer for all graphics
 in the given range of z-orders. When enabled, all
 graphics in the given range will be rendered once in an offscreen buffer (for example an
 <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/image/VolatileImage.html" title="class or interface in java.awt.image"><CODE>VolatileImage</CODE></A>); the image will then been reused as much as possible. The offscreen
 buffer may be invalidate at any time by some external event (including a call to any of
 <CODE>Graphic.refresh()</CODE> methods) and will be recreated as needed. Using offscreen
 buffer for background graphics that do not change often (e.g. a background map) help to make
 the GUI more responsive to frequent changes in foreground graphics (e.g. a glass pane with
 highlighted selections).
 <p>
 An arbitrary amount of ranges can be specified. Each <strong>distinct</strong> range will
 use its own offscreen buffer. This means that if this method is invoked twice for enabling
 buffering in overlapping range of z-values, then the union of the two ranges will shares
 the same offscreen image.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>lower</CODE> - The lower z-order, inclusive.<DD><CODE>upper</CODE> - The upper z-order, inclusive.<DD><CODE>type</CODE> - <A HREF="../../../../org/geotools/display/canvas/ImageType.html#VOLATILE"><CODE>ImageType.VOLATILE</CODE></A> or <A HREF="../../../../org/geotools/display/canvas/ImageType.html#BUFFERED"><CODE>ImageType.BUFFERED</CODE></A> for enabling offscreen
              buffering for the specified range, or <A HREF="../../../../org/geotools/display/canvas/ImageType.html#NONE"><CODE>ImageType.NONE</CODE></A> for disabling it.</DL>
</DD>
</DL>
<HR>

<A NAME="clearCache()"><!-- --></A><H3>
clearCache</H3>
<PRE>
protected void <B>clearCache</B>()</PRE>
<DL>
<DD>Clears all cached data. Invoking this method may help to release some resources for other
 applications. It should be invoked when we know that the map is not going to be rendered
 for a while. Note that this method doesn't changes the renderer setting; it will just slow
 down the first rendering after this method call.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#clearCache()">clearCache</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html" title="class in org.geotools.display.canvas">ReferencedCanvas</A></CODE></DL>
</DD>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="dispose()"><!-- --></A><H3>
dispose</H3>
<PRE>
public void <B>dispose</B>()</PRE>
<DL>
<DD>Method that may be called when a  is no longer needed. The results
 of referencing a canvas or any of its graphics after a call to 
 are undefined.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE>dispose</CODE> in interface <CODE>Canvas</CODE><DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html#dispose()">dispose</A></CODE> in class <CODE><A HREF="../../../../org/geotools/display/canvas/AbstractCanvas.html" title="class in org.geotools.display.canvas">AbstractCanvas</A></CODE></DL>
</DD>
<DD><DL>
<DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html#dispose()"><CODE>AbstractGraphic.dispose()</CODE></A>, 
<A HREF="http://java.sun.com/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/PlanarImage.html#dispose()" title="class or interface in javax.media.jai"><CODE>PlanarImage.dispose()</CODE></A></DL>
</DD>
</DL>
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