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<HTML><HEAD><TITLE>Language</TITLE></HEAD><BODY><H1 ALIGN=CENTER>BuildGraph Language</H1>The language interpreted by the BuildGraph class is (hopefully!) simple and straight forward. It is made up of about 20 reserved words, some words having multiple meanings depending on context. The best way to understandhow to construct a graph definition file is to look at an <A><A HREF="example5.data">example</A><P>Context is changed using a  keyword and a { } pair. In C this would be considerd the scope. Only a subset of keywords can change the context. These keywords usually define an object that must be constructed from a set of definitionsexamples of such objects are fonts, axis, datasets, titles, labels etc.<P>The BuildGraph language is not complete. Some plot features available in the class definitions are not available in the plot language.<P><HR><H2>The Interpreter</H2>The language interpreter only recognises predefines keywords, numbers (scientific notation is recognised), the context (scope) defining braces { }, and strings delimetered by ".<P>Everything following the # characeter is interpreted as a comment. All blank lines are ignored.<P>Anything else will be reported as an error.<HR><H2>Context keywords</H2>To change context a keyword is followed (and encloses context commands) by a pair of braces. An example of a new context is the font context.<BREAK><PRE><CODE> font {                   style bold                   name "Helvetica"                   size 25                  }</CODE></PRE>The font command above might itself be enclosed in the title context or label context.<DL>   <DT><B>GRAPH2D</B>   <DD>This is currently one of three main contexts (like the main    procedure in C). This defines the type of graph to build. A    non-interactive plot using the Graph2D class.   <DT><B>G2DINT</B>   <DD>The second type of plot to build. An interactive plot using the       G2Dint class.   <DT><B>CONTOUR</B>   <DD>The third type of plot to build. An interactive contour plot using the       Contour class.   <DT><B>AXIS</B>   <DD>Define an axis using keywords such as LABEL, AXIS, BOTTOM, TOP, LEFT,       RIGHT, COLOR and ATTACH.   <DT><B>DATA</B>   <DD>Define a data set, using keywords such as, URL, MARKER, COLOR.   <DT><B>CDATA</B>   <DD>Define the data grid for a contour plot.   <DT><B>MARKER</B>   <DD>In the context of a dataset this keyword will define       the STYLE, COLOR and SIZE of the marker to use for the data set.       In the context of GRAPH2D or G2DINT it should only contain       the URL of the marker file.   <DT><B>TITLE</B>   <DD>In the context of GRAPH2D, G2DINT or CONTOUR define the title of the plot. In    the context of AXIS define the axis title. TITLE uses the keywords NAME, FONT   and COLOR. A title example<BREAK>   <PRE>title {                 name "This could be a plot title or an axis title"                 color 0 255 255                 font {                         style plain                        name "TimesRoman"                        size 15                       }               }    </PRE>   <DT><B>LABEL</B>   <DD>Only to be used in the Axis context, define the axis labels, using   the keywords FONT and COLOR   <DT><B>FONT</B>   <DD>Define a font using the keywords SIZE, STYLE and NAME.   <DT><B>GRID</B>   <DD>Define the grid to be displayed, using the keywords ON, OFF, and    COLOR.   <DT><B>ZERO</B>   <DD>Define the zero line to be displayed, using the keywords ON, OFF, and    COLOR.   </DL><HR><H2>Keywords</H2><DL>    <DT><B>URL</B> string	<DD>Should be followed by a string which is the url of the file to be 	loaded.	<DL>	<DT>Context	<DD>MARKER - the url of the marker file to load	<DD>DATA - the url of the data file to load.	</DL>    <DT><B>SIZE</B> integer    <DD>Should be followed by an integer.	<DL>	<DT>Context	<DD>MARKER - the size of the marker to draw.	<DD>FONT - the size of the font.	</DL>    <DT><B>COLOR</B> integer integer integer    <DD>Should be followed by 3 integers in the range 0 to 255. The values     of red, green and blue.    <DT><B>NAME</B> string    <DD>Should be followed by a string.	<DL>	<DT>Context	<DD>FONT - the logical name of the font	<DD>DATA - the logical name of the dataset. This is the name used in the 	ATTACH command to attach datasets to axis.	<DD>TITLE - the string to display in the title of the axis or the plot.	</DL>    <DT><B>STYLE</B> integer or keyword    <DD>Should be followed by an integer or keyword.	<DL>	<DT>Context	<DD>MARKER - the integer following the STYLE keyword is the marker	to use while drawing the dataset.	<DD>FONT - should be followed by one of the following keywords PLAIN, BOLD	or ITALICS. In the FONT context STYLE can be repeated and	as in the Font class the styles become aditive. An example of a bold-italic	font is	      <PRE>font {	                  name "TimeRoman"	                  size  20	                  style bold	                  style italic	                  }	       </PRE>	</DL>    <DT><B>BOTTOM</B> integer or alone    <DD>Either an axis orientation command or the width of a boundary    of the plot. 	<DL>	<DT>Context	<DD>AXIS - The orientation of the plot	<DD>GRAPH2D - followed by an integer the width of the bottom boundary of 	the plot	</DL>    <DT><B>TOP</B> integer or alone    <DD>Either an axis orientation command or the width of a boundary    of the plot. 	<DL>	<DT>Context	<DD>AXIS - The orientation of the plot	<DD>GRAPH2D - followed by an integer the width of the top boundary of 	the plot	</DL>    <DT><B>LEFT</B> integer or alone    <DD>Either an axis orientation command or the width of a boundary    of the plot. 	<DL>	<DT>Context	<DD>AXIS - The orientation of the plot	<DD>GRAPH2D - followed by an integer the width of the left boundary of 	the plot	</DL>    <DT><B>RIGHT</B> integer or alone    <DD>Either an axis orientation command or the width of a boundary    of the plot. 	<DL>	<DT>Context	<DD>AXIS - The orientation of the plot	<DD>GRAPH2D - followed by an integer the width of the right boundary of 	the plot	</DL>    <DT><B>ON</B>	<DL>	<DT>Context	<DD>DATA - draw straight line segments between data points.	<DD>GRID - draw the grid	<DD>ZERO - draw the zero line 	</DL>    <DT><B>OFF</B>	<DL>	<DT>Context	<DD>DATA - don't draw straight line segments between data points.	<DD>GRID - don't draw the grid	<DD>ZERO - don't draw the zero line 	</DL>    <DT><B>ATTACH</B> string    <DD>Attach a named dataset to an axis.	<DL>	<DT>Context	<DD>AXIS - attach the named data set (defined in the DATA context using 	the NAME keyword) to the current axis.	</DL>    <DT><B>PLAIN</B>    <DD>Only to be used as a STYLE value in the FONT context.    <DT><B>BOLD</B>    <DD>Only to be used as a STYLE value in the FONT context.    <DT><B>ITALIC</B>    <DD>Only to be used as a STYLE value in the FONT context.</DL></BODY></HTML>
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