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Annotation of researchv10no/cmd/ideal/RAW_FORMAT, revision 1.1.1.1

1.1       root        1: The IDEAL program puts out a code that is intended to be device-independent.
                      2: It looks like TROFF comments so that IDEAL output may be NROFFed safely,
                      3: or it may be filtered to produce TROFF commands to draw the picture.
                      4: It may also be run through filters that throw away all text but what
                      5: appears between .IS and .IE, in which case only the pictures in the
                      6: document will be run through the plot filter.
                      7: 
                      8: Elements of the output:
                      9: 
                     10: .IS
                     11:        start a picture;
                     12: 
                     13: ...minx x
                     14:        x becomes the logical x-coordinate of the upper left corner
                     15: ...maxy y
                     16:        y becomes the logical y-coordinate of the upper left corner
                     17: ...maxx x
                     18:        x becomes the logical x-coordinate of the lower right corner
                     19: ...miny y
                     20:        y becomes the logical y-coordinate of the lower right corner
                     21: ...width w
                     22:        scale the picture to be w inches wide
                     23: ...colwid w
                     24:        center the picture in a column w inches wide
                     25: ...line x1 y1 x2 y2
                     26:        draw a line segment from (x1,y1) to (x2,y2)
                     27: ...circle x0 y0 r
                     28:        draw a circle of radius r centered at (x0,y0)
                     29: ...arc x0 y0 x1 y1 x2 y2 theta1 theta2 r
                     30:        draw a counterclockwise arc of radius r centered at (x0,y0),
                     31:        starting at (x1,y1), at an angle theta1,
                     32:        ending at (x2,y2), at an angle theta2
                     33: ...spline x0 y0 x1 y1 x2 y2 ...
                     34:        draw a spline through the points named
                     35: ...left x0 y0 'string
                     36:        write string so it starts at (x0,y0)
                     37: ...center x0 y0 'string
                     38:        write string so it is centered at (x0,y0)
                     39: ...right x0 y0 'string
                     40:        write string so it ends at (x0,y0)
                     41: .IE
                     42:        end picture
                     43: .IF
                     44:        end picture

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