Amiga Plus 1996 #5

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FIG(1) USER COMMANDS FIG(1) NAME fig - Facility for Interactive Generation of figures SYNOPSIS fig [ -r ] [ file ] DESCRIPTION Fig is a menu-driven tool that allows the user to draw and manipulate objects interactively on the screen of a Sun Workstation. It can only be run within the SunWindows environment and requires a three-button mouse. File speci- fies the name of a file to be edited. The description of objects in the file will be read at the start of fig. The output from fig can be printed by first using f2p (fig to pic(1) translator, also known by its previous name ftop(1L)) to translate it into pic(1) language. The pic(1) file can be saved and edited like ordinary text file. To print the file one should issue the command: pic file | troff adding any required options to the invocation of troff(1). The file may be used in conjunction with any other troff(1) preprocessors. Another way to produce a hrad copy is to use f2ps (the fig to postscript translator) to produce a postscript file from fig file. The postscript file can be sent directly to a postscript printer via lpr(1). OPTIONS -r Change the position of the panel window to the right of the canvas window (default: left). GRAPHICAL OBJECTS The objects in fig are divided into primitive objects and compound object. The primitive objects are: ARC, CIRCLE, CLOSED SPLINE, ELLIPSE, POLYLINE, POLYGON, SPLINE, and TEXT. A primitive can be moved, rotated, flipped, copied or erased. A compound object is composed of primitive objects. The primitive objects that constitute a compound can not be individually modified, but they can be manipulated as an entity; a compound can be moved, rotated, flipped, copied or erased. An extra function that can be applied to a compound object is scaling, which is not available for primitive objects. DISPLAY WINDOWS Three windows comprise the display area of fig: the panel window the message window, and the canvas window. The mes- sage window always appears below the others; it is the area in which messages are sent and received. from the The menu window can be placed to the left or right of the the canvas window (default: left). POP-UP MENU The pop-up menu appears when the right mouse button is pressed with the cursor positioned within the canvas window. Positioning the cursor over the desired menu entry and releasing the button selects a menu entry. There are a number of file accessing functions in the pop-up menu. Most of the time when one of these functions is selected, the user will be asked for a file name. If the specified file can be located and the access permission are granted, fig will carry out the function. However in case things go wrong, fig will abort the function and printed the causes on the message window. Undo Undo the last object creation or modification. Redisplay Redraw the canvas. Remove all Remove all objects on the canvas window (can be undone). Edit file ... The current contents of the canvas are cleared and objects are read from the specified file. The user will be asked for a file name. This file will become the current file. Save Save the current contents of the canvas in the current file. If no file is being edited, the user will be asked for a file name as in the "Save in ..." function. Read file ... Read objects from the specified file and merge them with objects already shown on the canvas. (The user will be asked for a file name.) Save as ... Save objects on the screen into a file specified by the user. (The user will be asked for a file name.) Status Show the name of the current file and directory. Change Directory Change the working directory. Any file name without a full path name will employ the current working direc- tory. Save & Exit Save the objects in the current file and exit from fig. If there is no current file, the user will be asked for a file name. No confirmation will be asked. Quit Exit from fig, discarding all objects. The user will be asked to confirm the action, by clicking the left but- ton. Save as BITMAP ... Create a bitmap picture of the drawings for use with other tools (for example, for use as an icon). The smallest rectangular area of pixels that encompasses the figure is written to the named file (the user will be asked for a file name) from top row to bottom and left to right (in Sun raster format). Only TEXT objects that are parts of compound objects will be treated as parts of the picture; other texts are saved as objects in fig format following the bitmap data. The coordinates of these text objects can be used to identify locations on the bitmap. MENU WINDOW MANIPULATION FUNCTIONS Icons in the menu window represent object manipulation func- tions, modes and other drawing or modification aids. Mani- pulation functions are selected by positioning the cursor over it and clicking the left mouse button. The selected icon is highlighted, and a message describing its function appears in the message window. The left and middle buttons are used to creat and modify objects in the canvas window. Most actions start with clicking of the left button and end with clicking of the right button. There is no need to hold down a button while positioning the cursor. MENU WINDOW COMMAND DESCRIPTIONS Entries in the panel window can be classified into two categories: object creation/modification/removal commands (only one of which may be active at any one time), and draw- ing aids (which act as toggle switches). There are two ways for drawing circles, two for ellipses, two for splines and two for closed splines. There are two basic splines. One is the interpolated spline in which the spline pass thorough the entered points (knots). The other is the normal spline in which on control points are passed by the spline (except for the two end points in the open spline). OBJECT CREATION/MODIFICATION/REMOVAL Multiple commands are grouped thematically in the following descriptions (which is listed alphabetically). ADD/DELETE ARROWS Add or delete arrow heads for POLYLINE, POLYGON, SPLINE or CLOSED SPLINE objects (points of a BOX can not be added or deleted). ADD/DELETE POINTS Add or delete points for POLYLINE, POLYGON, SPLINE or CLOSED SPLINE objects (points of a BOX can not be added or deleted). ARC Create an arc. Specify three points using the left button. BOX Create rectangular boxes. Start with the left button and terminate with the right button. BREAK COMPOUND Break a compound object to allow manipulation of its component parts. Click the left button on the bounding box of the compound object. CIRCLE Create circles by specifying their radii or diameters. Click the left button on the canvas window, move the cursor until the desired radius or diameter is reached, then click the middle button to terminate. The circle will be drawn after the pressing of the middle button. CLOSED INTERPOLATED SPLINE Create closed or periodic splines. The function is similar to POLYGON except that a closed interpolated spline is drawn. The spline will pass through the points (knots). CLOSED SPLINE Create closed or periodic spline objects. The function is similar to POLYGON except that a closed spline will be drawn instead of polygon. The entered points are just control points; i.e., the spline will not pass any of these points. COPY Copy object. Click the left button over part of the object to be copied (for CIRCLE and ELLIPSE objects, position on their circumferences). Drag the object to the desired position and click the middle button. This function as well as the following three functions (MOVE, MOVE POINT, REMOVE) will cause point markers (manipulation aids) to be shown on the canvas window. There are no markers for CIRCLE or ELLIPSE objects. ELLIPSE Create ellipses using the same procedure as for the drawing of circles. GLUE Glue the primitive objects within a bounding box into a compound object (the bounding box itself is not part of the figure; it is a visual aid for manipulating the compound). INTERPOLATED SPLINE Create (cubic spline) spline objects. Enter control vectors in the same way as for creation of a POLYLINE object. At least three points (two control vectors) must be entered. The spline will pass through the entered points. MOVE Move objects in the same way as in COPY. MOVE POINT Modify the position of points of POLYLINE, BOX, POLYGON, ELLIPSE, ARC and SPLINE objects. Click the left button over the desired point, reposition the point, and click the middle button. Note that BOX and POLYGON objects are internally stored as POLYLINE objects, and therefore moving certain points may open these objects. POLYGON Same as POLYLINE except that a line segment is drawn connecting the first and last points entered. POLYLINE Create polylines (line segments connecting a sequence of points). Enter points by clicking the left button at the desired positions on the canvas window. Click the middle button to terminate. REMOVE Remove (or delete) objects. SCALE COMPOUND Only compound objects can be scaled. Click the left button on a corner of the bounding box, stretch the bounding box to the desired size, and click the middle button. SPLINE Create (quadratic spline) spline objects. Enter con- trol vectors in the same way as for creation of a POLY- LINE object. At least three points (two control vec- tors) must be entered. The spline will pass only the two end points. TEXT Create text strings. Click the left button at the desired position on the canvas window, then enter text from the keyboard. Terminate by clicking the middle button or typing the return key. TURN Turn POLYGON into a CLOSED INTERPOLATED SPLINE object, or turn POLYLINE into a INTERPOLATED SPLINE object. DRAWING AIDS Drawing aids act as toggle switches. More than one can be selected at a time (except for GRID and the line drawing modes). AUTO FORWARD/BACKWARD ARROW Automatically add forward/backward arrow heads to POLY- LINE, SPLINE or ARC objects. FLIP Invert the object (middle button) or produce a mirror- image copy of an object (left button). Point to part of the object ("the handle"), click the appropriate but- ton. GRID Display either the quarter- or half-inch grids (left button). MAGNET Round points to the nearest 1/16 of an inch. This affects every function, and is provided as an alignment aid. UNRESTRICTED Allow lines to be drawn with any slope. MANHATTAN Enforce drawing of lines in the horizontal and vertical direction only. Both MANHATTAN and MOUNTAIN can be turned on simultaneously. The creations of POLYGON, POLYLINE and SPLINE objects are affected by these two modes. MOUNTAIN Enforce drawing of only diagonal lines. Both MANHATTAN and MOUNTAIN can be turned on simultaneously. The crea- tions of POLYGON, POLYLINE and SPLINE objects are affected by these two modes. MANHATTAN MOUNTAIN Allow lines to be drawn at any slope allowed when in MOUNTIAIN or MANHATTAN modes. LATEX LINE Allow lines to be drawn only at slopes which can be handled by LaTeX picture environment lines: slope = x/y, where x,y are integers in the range [-6,6]. LATEX VECTOR Allow lines to be drawn only at slopes which can be handled by LaTeX picture environment vectors: slope = x/y, where x,y are integers in the range [-4,4]. ROTATE Rotate the object (middle button) or copy (left button) +90 degrees. SOLID/DASHED LINE STYLE Toggle between solid and dashed line styles. The dash length is fixed at 0.05 inch. BUGS Text strings will appear differently on hard copy, because the display fonts are fixed-width fonts while the fonts used by pic(1) are variable-width fonts. A double quote in a text string should be preceded by a back slash if the it is to be printed through pic(1). Objects that extend beyond the canvas window may cause image shrinkage in hard copy printed by pic(1), since it will try to fit every object onto a single 8.5" x 11" page. Ellipses which are too narrow may cause fig to loop forever. Objects which are created while one of the grids is on may appear ragged. This can be corrected by selecting Redisplay from the pop-up menu. The X11 cursors are not the original ones but chosen from X11's cursor font. Righthand panel is not supported. It should be possible to do that but Ken was too lazy. SEE ALSO Brian W. Kernighan PIC - A Graphics Language for Typesetting User Manual col(1) ditroff(1), eqn(1), f2p(1), f2ps(1), man(7), me(7), ms(7), pic(1), tbl(1), troff(1), ACKNOWLEDGEMENT Many thanks goes to Professor Donald E. Fussell who inspired the creation of this tool. AUTHOR Supoj Sutanthavibul University of Texas at Austin (supoj@sally.UTEXAS.EDU) Manual page modified by R. P. C. Rodgers, UCSF School of Pharmacy, San Francisco, CA 94118 Frank Schmuck of Cornell contributed the LaTeX line drawing modes.