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NAME

       winop - Perform assorted window and image operations

SYNOPSIS

       winop changes window

       winop gradients leftcolor rightcolor gradients

       winop image subcommand ...

              winop image alpha srcImage destImage color

              winop image colors ?-alpha? srcImage

              winop image convolve srcImage destImage filter

              winop image gradient image leftcolor rightcolor ...

              winop image merge srcImage1 srcImage2 destImage ?alpha? ?...?

              winop image mirror srcImage1 destImage ?x|y|xy|tile|outer|inner?

              winop image quantize srcImage destImage ?nColors?

              winop image readjpeg filename photoname

              winop image resample srcImage destImage ?horizFilter? ?vertFilter?

              winop image rotate srcImage destImage angle

              winop   image   subsample   srcImage  destImage  x  y  width  height  ?horizFilter?
              ?vertFilter?

       winop lower ?window?...

       winop map ?window?...

       winop move window x y

       winop query

       winop raise ?window?...

       winop snap window photoName ?width height ?

       winop unmap ?window?...

       winop warpto ?window?
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DESCRIPTION

       The winop command performs various window and image operations on Tk  windows  using  low-
       level Xlib function calls to work around window manager pecularities.

INTRODUCTION

       Tk  has  several  commands  for  manipulating  its  windows: raise, lower, wm, etc.  These
       commands ask the window manager to perform operations on Tk windows.   In  some  cases,  a
       particular window manager won't perform the operation as expected.

       For  example,  if  you  positioned a toplevel window using wm geometry, the window may not
       actually be at those particular coordinates.  The position of the window may be offset  by
       dimensions of the title bar added by the window manager.

       In  situations like these, the winop command can be used to workaround these difficulties.
       Instead, it makes low-level Xlib (such XRaiseWindow and XMapWindow) calls to perform these
       operations.

              toplevel .top
              wm withdraw .top

              # Set the geometry to make the window manager
              # place the window.
              wm geometry .top +100+100

              # Move the window to the desired location
              # and "update" to force the window manager
              # to recognize it.
              winop move .top 100 100
              update

              wm deiconify .top
              winop move .top 100 100

OPERATIONS

       The following operations are available for the winop command:

       winop changes window
              Realize window.

       winop image subcommand ...
              Image sub-commands.

              winop image alpha  ?-shift?  srcImage destImage color ?alpha?  ?withalpha?
                     Set  image  pixels  of the given color to transparent.  If an alpha value is
                     not given, it defaults to 0 (meaning transparent).  An alpha of 255 is  used
                     for  solid.   The srcImage and destImage may be the same.  If the color is *
                     any color is matched.  If color is prefixed with ! match is inverted.

              winop gradients leftcolor rightcolor width
                     Return a list of width colors that graduate from leftcolor to the color just
                     before  rightcolor.   Note  that  the last color in the returned list is not
                     rightcolor.  A typical use for this is calculating shadow colors.

              winop image blur srcImage dstImage ?radius?
                     Blur an image using gaussian blur.

              winop image colors  ?-alpha? ?-count? srcImage
                     Return list of distinct colors.  If -alpha is given, the alpha  is  appended
                     to  each  color  after  a colon, eg #FF0000:00.  If -count is given, returns
                     color/count pairs.

              winop image convolve srcImage destImage filter
                     Convolve an image: filter is a list of numbers.  The srcImage and  destImage
                     may be the same.

              winop image gradient image leftcolor rightcolor ...
                     Generate  a  gradient  from left to right into image.  The following options
                     are available:

                     -type halfsine|sine|linear|rectangular|radial|split|blank
                          Set the type of gradient.  The default is sine.

                     -skew N
                          The skew determines the initial fraction of the image that the gradient
                          occupies,  after  which  only rightcolor is used.  The skew must be > 0
                          and <= 1.0. The default value is 1.0, meaning not skewed.

                     -slant N
                          Make the gradient slant where a value of 1.0 slants at 45 degrees.  The
                          value must be between -100.0 and 100.0.

                     -mathval N
                          Curve the gradient by passing the Y position to the function -mathfunc.
                          The value must be  between  -100.0  and  100.0  (typically  1.0).   The
                          default is 0.0, which means disabled.

                     -mathfunc X
                          Function  to  use  with -mathval.  The default value is sin.  The value
                          must be one of: sin cos tan sinh cosh tanh asin acos atan log log10 exp
                          sqrt rand circle.

                     -rand N
                          Add  small  random  purturbations to gradient to avoid striation lines.
                          The value must be between 0.0 and 0.1.

                     -height N
                          Change the image height.

                     -width N
                          Change the image width.

              winop image merge srcImage1 srcImage2 destImage ?opacity? ?opacity2?
                     Merge two images with alpha blending.  The default ?opacity? is 0.5, and the
                     default for ?opacity2?  is 1.0 - ?opacity?.

              winop image mirror srcImage1 destImage ?x|y|xy|tile|outer|inner?  ?halo?
                     Flips an image on axis x, y or xy.  The tile option results in a double size
                     image with mirror copies appended to generate a tile-able image.  The  outer
                     option  is  used  to  resize an image while preserving the outside border by
                     halo pixels (default is 16).  The inner option copies  from  the  center  of
                     source   keeping   it  centered.   These  last  2  are  used  implicitly  by
                     blt::tile::button -bdtile, etc.  The srcImage1 and destImage must not be the
                     same if using tile, inner or outer.  The default is xy.

              winop image quantize srcImage destImage ?nColors?
                     Limit number of colors in image.  Default 1.  The srcImage and destImage may
                     be the same.

              winop image readjpeg filename photoname
                     Read a jpeg image using libjpeg.  IMG makes this obsolete (and thus probably
                     not builtin).

              winop image recolor srcImage destImage oldColor newColor ?alpha?
                     Change  pixels  from  oldColor  to  newColor.   If  ?alpha?  is not given it
                     defaults to 255 (opaque).  The srcImage and destImage may be the same.

              winop image resample srcImage destImage ?horizFilter? ?vertFilter?
                     Resample an image.  If srcImage and destImage are the same size, just  makes
                     a  copy.   Otherwise the image is resized to the size of destImage, possibly
                     wih filtering.  Filters are one of: bell bessel box bspline  catrom  default
                     dummy  gauss8  gaussian  gi  lanczos3  mitchell  none  sinc  triangle.   The
                     destImage must be greater than 1x1.

              winop image rotate srcImage destImage angle
                     Rotate an image.  The srcImage and destImage may be the same.

              winop  image  subsample  srcImage  destImage  x  y   width   height   ?horizFilter?
              ?vertFilter?
                     Resample area of an image.  See resample.

              winop image trans image x y ?alpha?
                     Get or set the integer alpha value within an image.

       winop lower ?window?...
              Lowers window to the bottom of the X window stack.  Window is the path name of a Tk
              window.

       winop map ?window?...
              Maps window on the screen.  Window is the path name of a Tk window.  If  window  is
              already mapped, this command has no effect.

       winop move window x y
              Move window to the screen location specified by x and y. Window is the path name of
              a Tk window, while x and y are screen coordinates.  This command returns the  empty
              string.

       winop query
              Query pointer position.  Returns @X,Y.

       winop raise ?window?...
              Raises window to the top of the X window stack. Window must be a valid path name of
              a Tk window.  This command returns the empty string.

       winop snap window photoName ?width height?
              Takes a snapshot of  the  window  and  stores  the  contents  in  the  photo  image
              photoName.  Window  is  the  valid  path  name of a Tk window which must be totally
              visible (unobscured).  PhotoName is the name of a Tk photo image which must already
              exist.   This  command  can  fail if the window is obscured in any fashion, such as
              covered by another window or partially offscreen.  In that case, an  error  message
              is  returned.   If  width  or  height is given, the image is resampled to the given
              size.

       winop unmap ?window?...
              Unmaps window from the screen. Window is the path name of a Tk window.

       winop warpto ?window?
              Warps the pointer to window. Window is the path name of a Tk window which  must  be
              mapped.  If  window is in the form @x,y, where x and y are root screen coordinates,
              the pointer is warped to that location on the screen.

              [I've never heard a good case for warping the pointer in an application.  It can be
              useful  for  testing,  but in applications, it's always a bad idea.  Simply stated,
              the user owns the pointer, not the application.  If you have  an  application  that
              needs it, I'd like to hear about it.]

              If  no  window argument is present the current location of the pointer is returned.
              The location is returned as a list in the form "x y", where x and y are the current
              coordinates of the pointer.

KEYWORDS

       window, map, raise, lower, pointer, warp