ImgChanged man page on DigitalUNIX

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Tk_ImageChanged(3)	     Tk Library Procedures	    Tk_ImageChanged(3)

______________________________________________________________________________

NAME
       Tk_ImageChanged - notify widgets that image needs to be redrawn

SYNOPSIS
       #include <tk.h>

       Tk_ImageChanged(imageMaster, x, y, width, height, imageWidth, imageHeight)

ARGUMENTS
       Tk_ImageMaster	imageMaster   (in)	Token  for  image,  which  was
						passed to  image's  createProc
						when the image was created.

       int		x	      (in)	X-coordinate   of   upper-left
						corner of  region  that	 needs
						redisplay    (measured	  from
						upper-left corner of image).

       int		y	      (in)	Y-coordinate   of   upper-left
						corner	of  region  that needs
						redisplay    (measured	  from
						upper-left corner of image).

       int		width	      (in)	Width  of region that needs to
						be redrawn, in pixels.

       int		height	      (in)	Height of region that needs to
						be redrawn, in pixels.

       int		imageWidth    (in)	Current	 width	of  image,  in
						pixels.

       int		imageHeight   (in)	Current height	of  image,  in
						pixels.
_________________________________________________________________

DESCRIPTION
       An  image  manager calls Tk_ImageChanged for an image whenever anything
       happens that requires the image to be redrawn.  As a result of  calling
       Tk_ImageChanged,	 any widgets using the image are notified so that they
       can redisplay themselves appropriately.	The imageMaster argument iden‐
       tifies  the  image,  and	 x, y, width, and height specify a rectangular
       region within the image that  needs  to	be  redrawn.   imageWidth  and
       imageHeight specify the image's (new) size.

       An  image  manager should call Tk_ImageChanged during its createProc to
       specify the image's initial size and to force redisplay	if  there  are
       existing	 instances  for	 the image.  If any of the pixel values in the
       image should change later on, Tk_ImageChanged should  be	 called	 again
       with  x,	 y,  width,  and  height values that cover all the pixels that
       changed.	 If the size of the image should change, then  Tk_ImageChanged
       must  be	 called to indicate the new size, even if no pixels need to be
       redisplayed.

SEE ALSO
       Tk_CreateImageType

KEYWORDS
       images, redisplay, image size changes

Tk				      4.0		    Tk_ImageChanged(3)
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