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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>?? 快捷鍵說明
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