<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <!--Converted with LaTeX2HTML 98.1p1 release (March 2nd, 1998) originally by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds * revised and updated by: Marcus Hennecke, Ross Moore, Herb Swan * with significant contributions from: Jens Lippmann, Marek Rouchal, Martin Wilck and others --> <HTML> <HEAD> <TITLE>Graphics</TITLE> <META NAME="description" CONTENT="Graphics"> <META NAME="keywords" CONTENT="vol1"> <META NAME="resource-type" CONTENT="document"> <META NAME="distribution" CONTENT="global"> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <LINK REL="STYLESHEET" HREF="vol1.css"> <LINK REL="next" HREF="node106.html"> <LINK REL="previous" HREF="node104.html"> <LINK REL="up" HREF="node100.html"> <LINK REL="next" HREF="node106.html"> </HEAD> <BODY > <!--Navigation Panel--> <A NAME="tex2html1849" HREF="node106.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html1845" HREF="node100.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html1839" HREF="node104.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html1847" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <A NAME="tex2html1848" HREF="node216.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="icons.gif/index_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html1850" HREF="node106.html">Alpha Memory</A> <B> Up:</B> <A NAME="tex2html1846" HREF="node100.html">XWindow display</A> <B> Previous:</B> <A NAME="tex2html1840" HREF="node104.html">Intensity Transformation Tables</A> <BR> <BR> <!--End of Navigation Panel--> <H3><A NAME="SECTION001021500000000000000"> </A> <A NAME="x-graphics"> </A> <BR> Graphics </H3> Graphics can be done either in an image channel or in the <I>overlay</I> channel which is associated with the display window. The overlay channel is always the highest numbered channel of a display and put on top of any displayed image channel. However, it is not implemented like an image channel. Therefore, only drawing and labeling functions are supported (i.e. you cannot load an image into the overlay channel). <BR> <BR> All plotting functionality is provided via the family of <TT>DRAW</TT> commands for different shapes. For writing text you choose a specific character font via a font no. <BR> This number refers to a font name as stored in the ASCII file <BR> <!-- MATH: $MIDASHOME/$ --> <I>MIDASHOME</I>/<TT>MIDVERS/systab/bin/x11fonts.dat</TT> (Unix syntax). <BR> Three fixed font sizes as well as one dynamic font are supported for writing text. The fonts for the fixed sizes are chosen once via the <TT>INITIALIZE/DISPLAY</TT> command, the dynamic font can be set with each individual labeling command. <A NAME="tex2html31" HREF="footnode.html#fnm"><SUP>7.1</SUP></A> <BR> <P> The application procedure <TT>showfonts.prg</TT> lets you view the available fonts, as well as create the ASCII fonts file. The currently available commands associated with the use of the overlay channel are: <BR> <BR> <TT>SET/OVERLAY</TT> - <I>enable the overlay of graphics on top of the image</I> <BR> <TT>CLEAR/OVERLAY</TT> - <I>disable the overlay </I> <BR> <TT>CLEAR/CHANNEL overlay</TT> - <I>clear contents of overlay channel </I> <BR> <TT>DRAW/...</TT> - <I>draw a geometric shape like <TT>CIRCLE</TT>, <TT>RECTANGLE</TT>, etc. in the overlay plane </I> <BR> <TT>LABEL/DISPLAY</TT> - <I>write a string into the overlay channel</I> <P> <HR> <!--Navigation Panel--> <A NAME="tex2html1849" HREF="node106.html"> <IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="icons.gif/next_motif.gif"></A> <A NAME="tex2html1845" HREF="node100.html"> <IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="icons.gif/up_motif.gif"></A> <A NAME="tex2html1839" HREF="node104.html"> <IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="icons.gif/previous_motif.gif"></A> <A NAME="tex2html1847" HREF="node1.html"> <IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="icons.gif/contents_motif.gif"></A> <A NAME="tex2html1848" HREF="node216.html"> <IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="icons.gif/index_motif.gif"></A> <BR> <B> Next:</B> <A NAME="tex2html1850" HREF="node106.html">Alpha Memory</A> <B> Up:</B> <A NAME="tex2html1846" HREF="node100.html">XWindow display</A> <B> Previous:</B> <A NAME="tex2html1840" HREF="node104.html">Intensity Transformation Tables</A> <!--End of Navigation Panel--> <ADDRESS> <I>Petra Nass</I> <BR><I>1999-06-09</I> </ADDRESS> </BODY> </HTML>
