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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Tue Nov 30 14:11:21 MST 2004 --><TITLE>Swarm 2.2 Reference Guide: Interface Canvas</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT ID="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT ID="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="package-tree.html"><FONT ID="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT ID="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT ID="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT ID="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="../../swarm/gui/ArchivedGeometryWidgetS.html"><B>PREV CLASS</B></A> <A HREF="../../swarm/gui/CanvasAbstractItem.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="Canvas.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">swarm.gui</FONT><BR>Interface Canvas</H2><DL><DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../swarm/gui/CanvasImpl.html">CanvasImpl</A></DD></DL><HR><DL><DT>public interface <B>Canvas</B><DT>extends <A HREF="../../swarm/gui/ArchivedGeometryWidget.html">ArchivedGeometryWidget</A>, <A HREF="../../swarm/gui/ArchivedGeometryWidgetS.html">ArchivedGeometryWidgetS</A></DL><P><strong> An interface to Tk canvas semantics.</strong>.The Canvas widget allows display of a diverse range of graphical objects.<P><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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> java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../swarm/gui/Canvas.html#addWidget$X$Y$centerFlag(java.lang.Object, int, int, boolean)">addWidget$X$Y$centerFlag</A></B>(java.lang.Object widget, int x, int y, boolean centerFlag)</CODE><BR> Position a widget inside the canvas</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../swarm/gui/Canvas.html#checkGeometry(java.lang.Object)">checkGeometry</A></B>(java.lang.Object frame)</CODE><BR> Make sure the that the geometry is `reasonable'.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> java.lang.Object</CODE></FONT></TD><TD><CODE><B><A HREF="../../swarm/gui/Canvas.html#removeWidget(java.lang.Object)">removeWidget</A></B>(java.lang.Object widget)</CODE><BR> Remove a widget from the canvas.</TD></TR></TABLE> <A NAME="methods_inherited_from_class_swarm.gui.ArchivedGeometryWidget"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface swarm.gui.<A HREF="../../swarm/gui/ArchivedGeometryWidget.html">ArchivedGeometryWidget</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../swarm/gui/ArchivedGeometryWidget.html#updateArchiver(swarm.defobj.Archiver)">updateArchiver</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_swarm.gui.Widget"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface swarm.gui.<A HREF="../../swarm/gui/Widget.html">Widget</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../swarm/gui/Widget.html#disableDestroyNotification()">disableDestroyNotification</A>, <A HREF="../../swarm/gui/Widget.html#enableDestroyNotification$notificationMethod(java.lang.Object, swarm.Selector)">enableDestroyNotification$notificationMethod</A>, <A HREF="../../swarm/gui/Widget.html#getDestroyedFlag()">getDestroyedFlag</A>, <A HREF="../../swarm/gui/Widget.html#getHeight()">getHeight</A>, <A HREF="../../swarm/gui/Widget.html#getParent()">getParent</A>, <A HREF="../../swarm/gui/Widget.html#getTopLevel()">getTopLevel</A>, <A HREF="../../swarm/gui/Widget.html#getWidgetName()">getWidgetName</A>, <A HREF="../../swarm/gui/Widget.html#getWidth()">getWidth</A>, <A HREF="../../swarm/gui/Widget.html#getWindowGeometry()">getWindowGeometry</A>, <A HREF="../../swarm/gui/Widget.html#getX()">getX</A>, <A HREF="../../swarm/gui/Widget.html#getY()">getY</A>, <A HREF="../../swarm/gui/Widget.html#pack()">pack</A>, <A HREF="../../swarm/gui/Widget.html#packBeforeAndFillLeft$expand(java.lang.Object, boolean)">packBeforeAndFillLeft$expand</A>, <A HREF="../../swarm/gui/Widget.html#packFill()">packFill</A>, <A HREF="../../swarm/gui/Widget.html#packFillLeft(boolean)">packFillLeft</A>, <A HREF="../../swarm/gui/Widget.html#packForgetAndExpand()">packForgetAndExpand</A>, <A HREF="../../swarm/gui/Widget.html#packToRight(java.lang.Object)">packToRight</A>, <A HREF="../../swarm/gui/Widget.html#setActiveFlag(boolean)">setActiveFlag</A>, <A HREF="../../swarm/gui/Widget.html#setHeight(int)">setHeight</A>, <A HREF="../../swarm/gui/Widget.html#setWidth(int)">setWidth</A>, <A HREF="../../swarm/gui/Widget.html#setWidth$Height(int, int)">setWidth$Height</A>, <A HREF="../../swarm/gui/Widget.html#setWindowGeometry(java.lang.String)">setWindowGeometry</A>, <A HREF="../../swarm/gui/Widget.html#setWindowTitle(java.lang.String)">setWindowTitle</A>, <A HREF="../../swarm/gui/Widget.html#setX$Y(int, int)">setX$Y</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_swarm.defobj.Drop"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface swarm.defobj.<A HREF="../../swarm/defobj/Drop.html">Drop</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../swarm/defobj/Drop.html#drop()">drop</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_swarm.defobj.DefinedObject"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface swarm.defobj.<A HREF="../../swarm/defobj/DefinedObject.html">DefinedObject</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../swarm/defobj/DefinedObject.html#compare(java.lang.Object)">compare</A>, <A HREF="../../swarm/defobj/DefinedObject.html#describe(java.lang.Object)">describe</A>, <A HREF="../../swarm/defobj/DefinedObject.html#describeID(java.lang.Object)">describeID</A>, <A HREF="../../swarm/defobj/DefinedObject.html#getDisplayName()">getDisplayName</A>, <A HREF="../../swarm/defobj/DefinedObject.html#getTypeName()">getTypeName</A>, <A HREF="../../swarm/defobj/DefinedObject.html#getZone()">getZone</A>, <A HREF="../../swarm/defobj/DefinedObject.html#perform(swarm.Selector)">perform</A>, <A HREF="../../swarm/defobj/DefinedObject.html#perform$with(swarm.Selector, java.lang.Object)">perform$with</A>, <A HREF="../../swarm/defobj/DefinedObject.html#perform$with$with(swarm.Selector, java.lang.Object, java.lang.Object)">perform$with$with</A>, <A HREF="../../swarm/defobj/DefinedObject.html#perform$with$with$with(swarm.Selector, java.lang.Object, java.lang.Object, java.lang.Object)">perform$with$with$with</A>, <A HREF="../../swarm/defobj/DefinedObject.html#respondsTo(swarm.Selector)">respondsTo</A>, <A HREF="../../swarm/defobj/DefinedObject.html#setDisplayName(java.lang.String)">setDisplayName</A>, <A HREF="../../swarm/defobj/DefinedObject.html#xfprint()">xfprint</A>, <A HREF="../../swarm/defobj/DefinedObject.html#xfprintid()">xfprintid</A>, <A HREF="../../swarm/defobj/DefinedObject.html#xprint()">xprint</A>, <A HREF="../../swarm/defobj/DefinedObject.html#xprintid()">xprintid</A></CODE></TD></TR></TABLE> <A NAME="methods_inherited_from_class_swarm.defobj.GetName"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Methods inherited from interface swarm.defobj.<A HREF="../../swarm/defobj/GetName.html">GetName</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../swarm/defobj/GetName.html#getName()">getName</A></CODE></TD></TR></TABLE> <P><!-- ============ FIELD DETAIL =========== --><!-- ========= CONSTRUCTOR DETAIL ======== --><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=1><FONT SIZE="+2"><B>Method Detail</B></FONT></TD></TR></TABLE><A NAME="addWidget$X$Y$centerFlag(java.lang.Object, int, int, boolean)"><!-- --></A><H3>addWidget$X$Y$centerFlag</H3><PRE>public java.lang.Object <B>addWidget$X$Y$centerFlag</B>(java.lang.Object widget, int x, int y, boolean centerFlag)</PRE><DL><DD>Position a widget inside the canvas<DD><DL></DL></DD></DL><HR><A NAME="removeWidget(java.lang.Object)"><!-- --></A><H3>removeWidget</H3><PRE>public java.lang.Object <B>removeWidget</B>(java.lang.Object widget)</PRE><DL><DD>Remove a widget from the canvas.<DD><DL></DL></DD></DL><HR><A NAME="checkGeometry(java.lang.Object)"><!-- --></A><H3>checkGeometry</H3><PRE>public java.lang.Object <B>checkGeometry</B>(java.lang.Object frame)</PRE><DL><DD>Make sure the that the geometry is `reasonable'.<DD><DL></DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_bottom"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT ID="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT ID="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="package-tree.html"><FONT ID="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT ID="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT ID="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT ID="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="../../swarm/gui/ArchivedGeometryWidgetS.html"><B>PREV CLASS</B></A> <A 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