**CIGAL Reference Manual, Chapter 2 (Commands): sketchcmds**
===== sketchcmds -- =====
**        **
          The following lists SKETCH's internal commands. Activate
          these commands by touching a button on a mouse or digitizing tablet, by selecting
          a menu entry, or by typing a character at the keyboard.  The codes are:
  
  Drawing Commands:
     D, MouseLeft,  or Pen 1  Draw to the current position
     M, MouseRight, or Pen 2  Move to the current position (without drawing)
     .                        Draw a point at the current position
     T                        Enter text at the current position
     P                        Paint inside the last list of vectors
     B                        Set color for back of last paint region (see note)
     A                        Draw an arrowhead (see note below)
  Editting Commands:
     E (or End key)           Erase the last vector
     H (or Home key)          Un-erase the last vector
     X (or Ctrl-End)          Erase the last list of vectors
     R (or Ctrl-Home)         Un-erase the last list of vectors
     O                        Offset the marked vector (see note below)
     W                        Convert absolute to relative coordinates (see note)
     Y                        Convert relative to absolute coordinates (see note)
  Measuring Commands:
     L (or * key)
  Measure Length and Area of all vectors drawn since last measurement (or since Marked vector)
                              (Measured values are stored in variable VDATA.)
     C                        Measure calibration bar (see note below)
  Vector Selection Commands:
     F (or /)                 Find (next) nearest vector
     N (or +)                 Find next vector list (not implemented)
     K (or -)                 Find previous vector list (not implemented)
     V                        Mark current vector
     U                        Unmark marked vector
     S                        Show marked vector
  Miscellaneous Commands:
     Z                        Enter Z value
     ?                        Display short SKETCH command summary
     q (or Q or ESC)          Quit SKETCH
  
  NOTE: Most of these commands should be self-explanatory, with the following
  exceptions:
        A  The Arrow command has 2 ways of determining the position and direction
           to use in drawing an arrowhead.  If the previous SKETCH command was a
           line drawing command (see 'D' above), the Arrow command places an
           arrowhead at the end of that line segment.  Otherwise, Arrow waits
           for you to enter 2 new screen positions (by clicking the cursor or
           pressing <Enter>); the arrowhead is then drawn at the second position,
           facing away from the first position.
        B  The Back command allows you to specify a different drawing intensity
           (color) for the back side of a painted region than that used for the
           front side.  To do so, immediately after painting a region select a
            new color and then use the B command to assign the back color.
           Obviously, the back color will not be seen unless you rotate the
           vector image to view the painted region from the other side (see
           [ROTATE][2]).
        C  The Calibrate command prompts you to trace a scale bar, when you are
           done enter a Move or type any character.  It will then ask you to
           enter the length of bar you have just drawn (enter the number and
           press <RETURN>).  From then on all length and area measurements will
           be expressed in the same units as your calibration bar.
        O  The Offset command lets you move a vector by adding offset values to
           its XYZ coordinates. To do so, you must first mark the vector you want
           to move (using the V command) and then click on the new position for
           that vector.  Note that if the vectors stored after the moved vector
           are in relative coordinates, then they will all be moved as well.
        W  Although SKETCH enters all vectors in absolute XYZ coordinates (i.e.,
           with respect to the screen origin) the W command lets you convert
           these to relative coordinates with respect to the position of the
           previous vector.  If you have marked a set of vectors using the V
           command then only those vectors will be converted, otherwise the W
           command converts the entire vector list to relative coordinates.
        Y  This command is the converse of the W command; it converts vectors
           stored in relative coordinates back to absolute coordinates.  You can
           convert the entire vector list, or a marked portion just as with the
           W command.
  
  Note: SKETCH command characters can be placed in command menus (see [MENUS][1]).
     This is done by creating a 2-character menu command: The SKETCH character
     preceded by a semicolon.  The semicolon causes the command to be normally
     ignored (treated as a comment) but signals it as a command code if the menu
     item is activated while running SKETCH.  For example, a menu entry of
          ;P
     lets you PAINT a region by clicking that menu item while running SKETCH.
  
**See Also:**\\
[[jvs:cigal:manual:chapter1:menus|MENUS(1)]], 
[[jvs:cigal:manual:chapter2:rotate|ROTATE(2)]], 
[[jvs:cigal:manual:chapter2:sketch|SKETCH(2)]]

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