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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_13) on Tue Jun 05 11:36:41 GMT-05:00 2007 --><META http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><TITLE>RenderingContext (Geotools 2.3.x 2.3.2 API)</TITLE><META NAME="keywords" CONTENT="org.geotools.display.canvas.RenderingContext class"><META NAME="keywords" CONTENT="objectiveCRS"><META NAME="keywords" CONTENT="displayCRS"><META NAME="keywords" CONTENT="getGraphics()"><META NAME="keywords" CONTENT="getPaintingArea()"><META NAME="keywords" CONTENT="setGraphicsCRS()"><META NAME="keywords" CONTENT="getAffineTransform()"><META NAME="keywords" CONTENT="getMathTransform()"><META NAME="keywords" CONTENT="getScale()"><META NAME="keywords" CONTENT="isPrinting()"><META NAME="keywords" CONTENT="addPaintedArea()"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="RenderingContext (Geotools 2.3.x 2.3.2 API)";}</SCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/RenderingContext.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../org/geotools/display/canvas/ReferencedGraphic2D.html" title="class in org.geotools.display.canvas"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="RenderingContext.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">org.geotools.display.canvas</FONT><BR>Class RenderingContext</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <IMG SRC="../../../../resources/inherit.gif" ALT="extended by"><B>RenderingContext</B></PRE><HR><DL><DT>public final class <B>RenderingContext</B><DT>extends <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL><P>Informations relative to a rendering in progress. A instance is created by <A HREF="../../../../org/geotools/display/canvas/BufferedCanvas2D.html#paint(java.awt.Graphics2D, java.awt.geom.AffineTransform)"><CODE>BufferedCanvas2D.paint(java.awt.Graphics2D, java.awt.geom.AffineTransform)</CODE></A> at rendering time, which iterates over all graphic objects and invokes <A HREF="../../../../org/geotools/display/canvas/GraphicPrimitive2D.html#paint(org.geotools.display.canvas.RenderingContext)"><CODE>GraphicPrimitive2D.paint(org.geotools.display.canvas.RenderingContext)</CODE></A> for each of them. The rendering context is disposed once the rendering is completed. instances contain the following informations: <p> <ul> <li>The <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Graphics2D.html" title="class or interface in java.awt"><CODE>Graphics2D</CODE></A> handler to use for rendering.</li> <li>The coordinate reference systems in use and the transformations between them.</li> <li>The area rendered up to date. This information shall be updated by each <A HREF="../../../../org/geotools/display/canvas/GraphicPrimitive2D.html" title="class in org.geotools.display.canvas"><CODE>GraphicPrimitive2D</CODE></A> while they are painting.</li> <li>The map scale.</li> </ul> <p> A rendering usually implies the following transformations (names are coordinate reference systems and arrows are transforms): <p align="center"> <img src="doc-files/right.png"> <A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#objectiveCRS"><CODE>objectiveCRS</CODE></A> <img src="doc-files/right.png"> <A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#displayCRS"><CODE>displayCRS</CODE></A> <img src="doc-files/right.png"> </p><P><P><DL><DT><B>Since:</B></DT> <DD>2.3</DD><DT><B>Author:</B></DT> <DD>Martin Desruisseaux</DD><DT><B>See Also:</B><DD><A HREF="../../../../org/geotools/display/canvas/BufferedCanvas2D.html#paint(java.awt.Graphics2D, java.awt.geom.AffineTransform)"><CODE>BufferedCanvas2D.paint(java.awt.Graphics2D, java.awt.geom.AffineTransform)</CODE></A>, <A HREF="../../../../org/geotools/display/canvas/GraphicPrimitive2D.html#paint(org.geotools.display.canvas.RenderingContext)"><CODE>GraphicPrimitive2D.paint(org.geotools.display.canvas.RenderingContext)</CODE></A><DT><B>Module:</B></DT><DD><CODE><B>ext/go</B></CODE> (<A HREF="http://maven.geotools.fr/repository/org/geotools/gt2-go/"><CODE>gt2-go.jar</CODE></A>) (<A HREF="http://maven.geotools.fr/reports/go/index.html">Maven report</A>) (<A HREF="http://svn.geotools.org/geotools/tags/2.3.2/ext/go/src/org/geotools/display/canvas/RenderingContext.java">SVN head</A>)</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> CoordinateReferenceSystem</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#displayCRS">displayCRS</A></B></CODE><BR> A snapshot of <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getDisplayCRS()"><CODE>ReferencedCanvas.getDisplayCRS()</CODE></A> at the time of painting. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> CoordinateReferenceSystem</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#objectiveCRS">objectiveCRS</A></B></CODE><BR> A snapshot of <A HREF="../../../../org/geotools/display/canvas/ReferencedCanvas.html#getObjectiveCRS()"><CODE>ReferencedCanvas.getObjectiveCRS()</CODE></A> at the time of painting. </TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#addPaintedArea(java.awt.Shape)">addPaintedArea</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Shape.html" title="class or interface in java.awt">Shape</A> area)</CODE><BR> Declares that an area has been painted in the <A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#getGraphics()">graphics handler</A>. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../../org/geotools/display/canvas/RenderingContext.html#addPaintedArea(java.awt.Shape, org.opengis.referencing.crs.CoordinateReferenceSystem)">addPaintedArea</A></B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/awt/Shape.html" title="class or interface in java.awt">Shape</A> area, CoordinateReferenceSystem crs)</CODE>⌨️ 快捷键说明
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