referencedcanvas2d.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

<A NAME="format(org.geotools.display.event.ReferencedEvent, java.lang.StringBuffer)"><!-- --></A><H3>
format</H3>
<PRE>
public boolean <B>format</B>(<A HREF="../../../../org/geotools/display/event/ReferencedEvent.html" title="interface in org.geotools.display.event">ReferencedEvent</A>&nbsp;event,
                      <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/StringBuffer.html" title="class or interface in java.lang">StringBuffer</A>&nbsp;toAppendTo)</PRE>
<DL>
<DD>Formats a value for a given event. The meaning of "value" depends on the underlying
 graphics. For example in the particular case of a Digital Elevation Model (DEM), it
 could be the altitude at the event location. This value is typically to be appended
 to some other informations, like the event geographic coordinates.
 <p>
 This method queries registered <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html" title="class in org.geotools.display.canvas">graphics</A> in decreasing
 <A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html#getZOrderHint()">z-order</A> until one is found to formats a
 value.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#format(org.geotools.display.event.ReferencedEvent, java.lang.StringBuffer)">format</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>
<DT><B>Parameters:</B><DD><CODE>event</CODE> - The event.<DD><CODE>toAppendTo</CODE> - The destination buffer for formatting a value. The <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/StringBuffer.html" title="class or interface in java.lang"><CODE>StringBuffer</CODE></A>
         argument type allows efficient use of <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/text/Format.html" title="class or interface in java.text"><CODE>Format</CODE></A> for example.
<DT><B>Returns:</B><DD> if this method has formatted a value, or  otherwise.</DL>
</DD>
</DL>
<HR>

<A NAME="getToolTipText(org.geotools.display.event.ReferencedEvent)"><!-- --></A><H3>
getToolTipText</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A> <B>getToolTipText</B>(<A HREF="../../../../org/geotools/display/event/ReferencedEvent.html" title="interface in org.geotools.display.event">ReferencedEvent</A>&nbsp;event)</PRE>
<DL>
<DD>Returns the string to be used as the tooltip for a given event.
 This method queries registered <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html" title="class in org.geotools.display.canvas">graphics</A> in decreasing
 <A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html#getZOrderHint()">z-order</A> until one is found to returns a
 non-null string.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getToolTipText(org.geotools.display.event.ReferencedEvent)">getToolTipText</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>
<DT><B>Parameters:</B><DD><CODE>event</CODE> - The event.
<DT><B>Returns:</B><DD>The tool tip text, or  if there is no tool tip for the given location.</DL>
</DD>
</DL>
<HR>

<A NAME="getAction(org.geotools.display.event.ReferencedEvent)"><!-- --></A><H3>
getAction</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/swing/Action.html" title="class or interface in javax.swing">Action</A> <B>getAction</B>(<A HREF="../../../../org/geotools/display/event/ReferencedEvent.html" title="interface in org.geotools.display.event">ReferencedEvent</A>&nbsp;event)</PRE>
<DL>
<DD>Returns the action to be used for a given event.
 This method queries registered <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html" title="class in org.geotools.display.canvas">graphics</A> in decreasing
 <A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html#getZOrderHint()">z-order</A> until one is found to returns a
 non-null action.
<P>
<DD><DL>
<DT><B>Overrides:</B><DD><CODE><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getAction(org.geotools.display.event.ReferencedEvent)">getAction</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>
<DT><B>Parameters:</B><DD><CODE>event</CODE> - The event.
<DT><B>Returns:</B><DD>The action, or  if there is no action for the given location.</DL>
</DD>
</DL>
<HR>

<A NAME="updateNormalizationFactor(org.opengis.referencing.crs.CoordinateReferenceSystem)"><!-- --></A><H3>
updateNormalizationFactor</H3>
<PRE>
protected void <B>updateNormalizationFactor</B>(CoordinateReferenceSystem&nbsp;crs)</PRE>
<DL>
<DD>Updates <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#normalizeToDots"><CODE>normalizeToDots</CODE></A> affine transform for the specified
 <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getObjectiveCRS()">objective coordinate reference system</A>.
 This method is invoked automatically by <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#setObjectiveCRS(org.opengis.referencing.crs.CoordinateReferenceSystem)"><CODE>setObjectiveCRS(org.opengis.referencing.crs.CoordinateReferenceSystem)</CODE></A>.
 Users don't need to invoke this method directly, but subclasses may
 override it.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>crs</CODE> - The new objective CRS.<DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#updateNormalizationFactor(org.opengis.referencing.crs.CoordinateReferenceSystem)"><CODE>updateNormalizationFactor(org.opengis.referencing.crs.CoordinateReferenceSystem)</CODE></A></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>Notifies all listeners that the <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas2D.html#objectiveToDisplay"><CODE>objectiveToDisplay</CODE></A> transform changed. This change
 is more often the consequence of some zoom action. The  argument can be
 computed as below:

 <blockquote><pre>
 AffineTransform change = <var>oldObjectiveToDisplay</var>.createInverse();
 change.preConcatenate(<var>newObjectiveToTransform</var>);
 </pre></blockquote>

 The default implementation invokes <code><A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic2D.html#zoomChanged(java.awt.geom.AffineTransform)">zoomChanged</A>(change)</code> for all registered <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic2D.html" title="class in org.geotools.display.canvas"><CODE>ReferencedGraphic2D</CODE></A>.
<P>
<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.<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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