| Pic.Frames | Part of Pic module |
| Syntax | Pic.Frames (pathName : string) : int
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| Description | Pic.Frames is used to determine the number of frames found
in a multiple frame GIF file.
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| Details | GIF files can contain multiple frames (pictures). Animated GIFs
function by each frame in the GIF one after another with a delay
between them.
Turing allows users to load multiple frame GIF images into a series of pictures into an array using the Pic.FileNewFrames procedure. The user can determine how many frames are found in the GIF file using Pic.Frames. The frames can be sequentially displayed using either Pic.DrawFrames or Pic.DrawFramesBack which display the images one at a time. (Pic.DrawFrames returns once all the images have been displayed, Pic.DrawFramesBack returns immediately allowing the program to continue execution while the frames are being displayed. Pic.Frames is a function which returns the number of frames found in the GIF. If it is used on a GIF that does not contain multiple images, or on a non-GIF image file, it returns 1.
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| Example | The program loads a multiple frame GIF called "globe.gif" and
displays it.
% Determine the number of frames in "globe.gif"
var numFrames := Pic.Frames ("globe.gif")
% Load the picture
var delayTime : int
var pics : array 1 .. numFrames of int
Pic.FileNewFrames ("globe.gif", pics, delayTime)
Pic.DrawFrames (pics, 10, 10, picCopy, numFrames, 50, false)
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| Execute | |
| Status | Exported qualified. This means that you can only call the function by calling Pic.Frames, not by calling Frames.
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| See also | Pic.FileNewFrames for information
on how to load a GIF image with multiple frames into an array of
ints. Pic.DrawFrames for information on how to sequentially display the images stored in array of pictures. Pic.DrawFramesBack for information on how to sequentially display the images stored in array of pictures while continuing to execute the program.
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