referencedcanvas.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

<CODE>protected </CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#ReferencedCanvas(org.opengis.go.display.DisplayFactory, int)">ReferencedCanvas</A></B>(DisplayFactory&nbsp;factory,
                 int&nbsp;dimension)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates an initially empty canvas with a default CRS of the specified number of dimensions.</TD>
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<B>Method Summary</B></FONT></TD>
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<CODE>&nbsp;Graphic</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#add(org.opengis.go.display.primitive.Graphic)">add</A></B>(Graphic&nbsp;graphic)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Adds the given  to this . </TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#clearCache()">clearCache</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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. For example it may be invoked from <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/applet/Applet.html#stop" title="class or interface in java.applet"><CODE>Applet</CODE></A>. Note
 that this method doesn't changes the renderer setting; it will just slow down the first
 rendering after this method call.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#format(org.geotools.display.event.ReferencedEvent, java.lang.StringBuffer)">format</A></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)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Formats a value for a given event. </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.4/docs/api/javax/swing/Action.html" title="class or interface in javax.swing">Action</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getAction(org.geotools.display.event.ReferencedEvent)">getAction</A></B>(<A HREF="../../../../org/geotools/display/event/ReferencedEvent.html" title="interface in org.geotools.display.event">ReferencedEvent</A>&nbsp;event)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the action to be used for a given event.
 </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;DerivedCRS</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDeviceCRS()">getDeviceCRS</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the Coordinate Reference System associated with the device of this .</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;DerivedCRS</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayCRS()">getDisplayCRS</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the Coordinate Reference System associated with the display of this .
 </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;MathTransform</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayToObjectiveTransform()">getDisplayToObjectiveTransform</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the coordinate transformation object for this . </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;Envelope</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getEnvelope()">getEnvelope</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an envelope that completly encloses all <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic.html#getEnvelope()">graphic envelopes</A> managed by this canvas. </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;Graphic[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getGraphicsAt(org.opengis.spatialschema.geometry.DirectPosition)">getGraphicsAt</A></B>(DirectPosition&nbsp;directPosition)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the s that occupy the given direct position.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;Graphic[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getGraphicsIn(org.opengis.spatialschema.geometry.Envelope)">getGraphicsIn</A></B>(Envelope&nbsp;bounds)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the s that occupy the given envelope.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;CoordinateReferenceSystem</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getObjectiveCRS()">getObjectiveCRS</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the objective Coordinate Reference System (the projection of a georeferenced CRS)
 for this . This is the "real world" CRS used for displaying all graphics.
 Note that underlying data in graphic primitives don't need to be in terms of this CRS.
 Transformations will be applied on the fly as needed at rendering time.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;MathTransform</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getObjectiveToDisplayTransform()">getObjectiveToDisplayTransform</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the coordinate transformation object for this . </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;double</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getScale()">getScale</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the scale factor, or <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Double.html#NaN" title="class or interface in java.lang"><CODE>NaN</CODE></A> if the scale is unknow. </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;CanvasState</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getState()">getState</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns a copy of the current state of this . </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getToolTipText(org.geotools.display.event.ReferencedEvent)">getToolTipText</A></B>(<A HREF="../../../../org/geotools/display/event/ReferencedEvent.html" title="interface in org.geotools.display.event">ReferencedEvent</A>&nbsp;event)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the string to be used as the tooltip for a given event.
 </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;Graphic</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getTopGraphicAt(org.opengis.spatialschema.geometry.DirectPosition)">getTopGraphicAt</A></B>(DirectPosition&nbsp;directPosition)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the top-most  that occupies given direct position. </TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;double[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getTypicalCellDimension(org.opengis.spatialschema.geometry.DirectPosition)">getTypicalCellDimension</A></B>(DirectPosition&nbsp;position)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns a typical cell dimension in terms of <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getObjectiveCRS()">objective CRS</A>.
 </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#graphicPropertyChanged(org.geotools.display.canvas.AbstractGraphic, java.beans.PropertyChangeEvent)">graphicPropertyChanged</A></B>(<A HREF="../../../../org/geotools/display/canvas/AbstractGraphic.html" title="class in org.geotools.display.canvas">AbstractGraphic</A>&nbsp;graphic,
                       <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/beans/PropertyChangeEvent.html" title="class or interface in java.beans">PropertyChangeEvent</A>&nbsp;event)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Invoked automatically when a graphic registered in this canvas changed. Subclasses can
 override this method if they need to react to some graphic change events, but should
 always invoke .</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#isVisible(org.opengis.spatialschema.geometry.DirectPosition)">isVisible</A></B>(DirectPosition&nbsp;coordinate)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns  if the given coordinate is visible on this . </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#remove(org.opengis.go.display.primitive.Graphic)">remove</A></B>(Graphic&nbsp;graphic)</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Removes the given  from this . Note that if the graphic is
 going to be added back to the same canvas later, then it is more efficient to invoke
 <CODE>Graphic.setVisible(boolean)</CODE> instead.
 <p>
 This method fires a {@value}
 property change event.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#removeAll()">removeAll</A></B>()</CODE>

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Remove all graphics from this canvas.
 <p>
 This method fires a {@value}
 property change event.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>protected &nbsp;void</CODE></FONT></TD>