Tk_DeleteImage(3) Tk Library Procedures Tk_DeleteImage(3)__________________________________________________________________________________________________________________________________________________NAME
Tk_DeleteImage - Destroy an image.
SYNOPSIS
#include <tk.h>
Tk_DeleteImage(interp, name)
ARGUMENTS
Tcl_Interp *interp (in) Interpreter for which the image was created.
const char *name (in) Name of the image.
_________________________________________________________________DESCRIPTION
Tk_DeleteImage deletes the image given by interp and name, if there is one. All instances of that image will redisplay as empty regions.
If the given image does not exist then the procedure has no effect.
KEYWORDS
delete image, image manager
Tk 4.0 Tk_DeleteImage(3)
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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 call-
ing Tk_ImageChanged, any widgets using the image are notified so that they can redisplay themselves appropriately. The imageMaster argu-
ment identifies 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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