1\begin{page}{HTXAdvPage5}{\Language{} paste-ins} 2\centerline{\fbox{{\tt \thispage}}}\newline 3\begin{scroll} 4 5The {\it paste} and {\it patch} facility (see \downlink{previous page}{HTXAdvPage4}) 6is used to display (or hide) the \Language{} output 7of an \Language{} command ({\tt\\spadcommand}) 8included in a 9\HyperName{} page. 10 11A mechanism has been set up to {\it automatically} generate 12these paste-ins. It amounts to replacing an 13{\tt \\spadcommand} by a {\tt \\spadpaste} in the 14\HyperName{} page. 15 16In the case of a \spadop{draw} \Language{} command 17, where the result is to create an interactive viewport, 18the appropriate command to use is {\tt \\graphpaste}. 19The effect of this is to include (as the output) 20the \Language{} generated {\it image} of the graph 21as an active area. Clicking on it will put up an 22interactive viewport. 23The {\tt \\graphpaste} command should be used only when 24the result of the associated \Language{} operation is 25to {\it create} an interactive viewport. It is {\it not} necessarily 26appropriate for all commands whose result 27is a \spadtype{TwoDimensionalViewport} or \spadtype{ThreeDimensionalViewport}. 28The {\tt \\spadpaste} and {\tt \\graphpaste} 29are macros defined in {\bf util.ht}. 30 31 32 33There is no automatic paste-in generation facility 34for \Language{} piles (the {\tt \\begin\{axiomsrc\}} command). 35 36 37The automatic paste-in generation mechanism works 38by invoking \Language{} with a particular option. 39\HyperName{} is also started automatically. It reads 40the {\tt \\spadpaste} and {\tt \\graphpaste} 41commands in all pages in a specified 42{\bf somefile.ht} and passes them to 43\Language{} for evaluation. \HyperName{} 44captures the output and writes it out (to a 45file called {\bf somefile.pht}) as the body of 46some {\it patch} definitions. The commands 47encountered are written to a file 48{\bf somefile.input} which you can {\tt )read} from an \Language{} session. 49It also creates directories for the graphics 50images encountered. Those files and directories 51will be written under the {\it current} directory. 52The idea is that you then include the {\it patch} definitions 53in {\bf somefile.pht} in your local database using {\bf htadd}. 54 55 56You can try this feature now. Edit a file called, say, {\bf trypaste.ht} 57in a directory, say {\bf /tmp}. Put the following \HyperName{} text 58in it. 59\beginImportant 60\newline 61{\tt \\begin\{page\}\{TryPaste\}\{Trying out paste-in generation\}}\newline 62{\tt \\begin\{scroll\}}\newline 63{\tt \\spadpaste\{f z == z^2 \\bound\{f\}\}}\newline 64{\tt \\graphpaste\{draw(f,-1..1) \\free\{f\}\}}\newline 65{\tt \\spadpaste\{x:= f 3 \\free\{f\}\}}\newline 66{\tt \\end\{scroll\}}\newline 67{\tt \\end\{page\}}\newline 68\endImportant 69 70From the directory that contains the {\bf trypaste.ht}, 71issue 72\centerline{ 73{\tt htadd -l ./trypaste.ht} 74} 75You will get the 76{\bf ht.db} database file. 77Set the environment variable {\tt HTPATH} so that 78it points first to your directory and then the system directory. 79In the {\bf /bin/csh}, you might use 80\centerline{ 81{\tt setenv HTPATH /tmp:\$FRICAS/share/hypertex/pages} 82} 83Make sure that no {\bf trypaste.input} or {\bf trypaste.pht} 84files exist in the directory. 85Then issue 86\centerline{ 87{\tt fricas -paste trypaste.ht} 88} 89 and wait for 90\Language{} to finish. 91 92There is a modification you will wish to make to 93the {\bf trypaste.pht} file. 94This is because the generated \HyperName{} text will assume that 95the {\it viewport} data will be located in the 96{\it system} directory. 97\centerline{{\bf \env{FRICAS}/share/viewports}} 98You may want to place your images in a different directory, 99say, {\bf /u/sugar/viewports}. 100If so, then change all occurrences of 101\beginImportant 102\newline 103{\tt \\env\{FRICAS\}/share/viewports/} 104\centerline{{\it by}} 105{\tt /u/sugar/viewports/} 106\endImportant 107in the file {\bf trypaste.pht}. The last step 108is to include the {\it patch} definitions 109in {\bf trypaste.pht} to your local database. 110Issue 111\centerline{ 112{\tt htadd -l ./trypaste.pht} 113} 114to update the database. If you have provided 115a link to your pages from the {\tt RootPage} 116via the {\tt \\localinfo} macro, you should now 117be able to start \Language{} or \HyperName{} 118and see the computed \Language{} output whenever you 119click on the buttons to the left of each command. 120 121 122 123\end{scroll} 124\beginmenu 125\menulink{Next Page --- Miscellaneous}{HTXAdvPage6} 126\endmenu 127 128\end{page} 129