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5.1 KiB
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105 lines
5.1 KiB
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<HTML><HEAD><TITLE>Tk Built-In Commands - image manual page</TITLE></HEAD><BODY>
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<DL>
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<DD><A HREF="image.htm#M2" NAME="L593">NAME</A>
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<DL><DD>image - Create and manipulate images</DL>
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<DD><A HREF="image.htm#M3" NAME="L594">SYNOPSIS</A>
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<DL>
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<DD><B>image</B> <I>option </I>?<I>arg arg ...</I>?
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</DL>
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<DD><A HREF="image.htm#M4" NAME="L595">DESCRIPTION</A>
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<DL>
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<DD><A HREF="image.htm#M5" NAME="L596"><B>image create </B><I>type </I>?<I>name</I>? ?<I>option value ...</I>?</A>
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<DD><A HREF="image.htm#M6" NAME="L597"><B>image delete </B>?<I>name name</I> ...?</A>
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<DD><A HREF="image.htm#M7" NAME="L598"><B>image height </B><I>name</I></A>
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<DD><A HREF="image.htm#M8" NAME="L599"><B>image names</B></A>
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<DD><A HREF="image.htm#M9" NAME="L600"><B>image type </B><I>name</I></A>
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<DD><A HREF="image.htm#M10" NAME="L601"><B>image types</B></A>
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<DD><A HREF="image.htm#M11" NAME="L602"><B>image width </B><I>name</I></A>
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</DL>
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<DD><A HREF="image.htm#M12" NAME="L603">BUILT-IN IMAGE TYPES</A>
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<DL>
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<DD><A HREF="image.htm#M13" NAME="L604"><B>bitmap</B></A>
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<DD><A HREF="image.htm#M14" NAME="L605"><B>photo</B></A>
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</DL>
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<DD><A HREF="image.htm#M15" NAME="L606">KEYWORDS</A>
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</DL><HR>
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<H3><A NAME="M2">NAME</A></H3>
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image - Create and manipulate images
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<H3><A NAME="M3">SYNOPSIS</A></H3>
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<B>image</B> <I>option </I>?<I>arg arg ...</I>?<BR>
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<H3><A NAME="M4">DESCRIPTION</A></H3>
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The <B>image</B> command is used to create, delete, and query images.
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It can take several different forms, depending on the
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<I>option</I> argument. The legal forms are:
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<P>
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<DL>
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<P><DT><A NAME="M5"><B>image create </B><I>type </I>?<I>name</I>? ?<I>option value ...</I>?</A><DD>
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Creates a new image and returns its name.
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<I>type</I> specifies the type of the image, which must be one of
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the types currently defined (e.g., <B><A HREF="../TclCmd/bitmap.htm">bitmap</A></B>).
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<I>name</I> specifies the name for the image; if it is omitted then
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Tk picks a name of the form <B>image</B><I>x</I>, where <I>x</I> is
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an integer.
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There may be any number of <I>option</I>-<I>value</I> pairs,
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which provide configuration options for the new image.
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The legal set of options is defined separately for each image
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type; see below for details on the options for built-in image types.
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If an image already exists by the given name then it is replaced
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with the new image and any instances of that image will redisplay
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with the new contents.
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It is important to note that the image command will silently overwrite any
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procedure that may currently be defined by the given name, so choose the
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name wisely. It is recommended to use a separate namespace for image names
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(e.g., <B>::img::logo</B>, <B>::img::large</B>).
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<P><DT><A NAME="M6"><B>image delete </B>?<I>name name</I> ...?</A><DD>
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Deletes each of the named images and returns an empty string.
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If there are instances of the images displayed in widgets,
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the images won't actually be deleted until all of the instances
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are released.
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However, the association between the instances and the image
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manager will be dropped.
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Existing instances will retain their sizes but redisplay as
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empty areas.
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If a deleted image is recreated with another call to <B>image create</B>,
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the existing instances will use the new image.
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<P><DT><A NAME="M7"><B>image height </B><I>name</I></A><DD>
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Returns a decimal string giving the height of image <I>name</I>
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in pixels.
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<P><DT><A NAME="M8"><B>image names</B></A><DD>
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Returns a list containing the names of all existing images.
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<P><DT><A NAME="M9"><B>image type </B><I>name</I></A><DD>
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Returns the type of image <I>name</I> (the value of the <I>type</I>
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argument to <B>image create</B> when the image was created).
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<P><DT><A NAME="M10"><B>image types</B></A><DD>
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Returns a list whose elements are all of the valid image types
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(i.e., all of the values that may be supplied for the <I>type</I>
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argument to <B>image create</B>).
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<P><DT><A NAME="M11"><B>image width </B><I>name</I></A><DD>
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Returns a decimal string giving the width of image <I>name</I>
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in pixels.
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<P></DL>
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<H3><A NAME="M12">BUILT-IN IMAGE TYPES</A></H3>
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The following image types are defined by Tk so they will be available
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in any Tk application.
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Individual applications or extensions may define additional types.
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<P>
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<DL>
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<P><DT><A NAME="M13"><B>bitmap</B></A><DD>
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Each pixel in the image displays a foreground color, a background
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color, or nothing.
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See the <B><A HREF="../TclCmd/bitmap.htm">bitmap</A></B> manual entry for more information.
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<P><DT><A NAME="M14"><B>photo</B></A><DD>
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Displays a variety of full-color images, using dithering to
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approximate colors on displays with limited color capabilities.
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See the <B><A HREF="../TclCmd/photo.htm">photo</A></B> manual entry for more information.
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<P></DL>
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<H3><A NAME="M15">KEYWORDS</A></H3>
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<A href="../Keywords/H.htm#height">height</A>, <A href="../Keywords/I.htm#image">image</A>, <A href="../Keywords/T.htm#types of images">types of images</A>, <A href="../Keywords/W.htm#width">width</A>
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<HR><PRE>
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<A HREF="../copyright.htm">Copyright</A> © 1994 The Regents of the University of California.
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<A HREF="../copyright.htm">Copyright</A> © 1994-1996 Sun Microsystems, Inc.
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<A HREF="../copyright.htm">Copyright</A> © 1995-1997 Roger E. Critchlow Jr.</PRE>
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</BODY></HTML>
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