moving image

[Paul Gr]

Dear Wendy,

The easiest way to do this (without using any script), is to create a series 
of bitmaps images which are displayed in sequence at a relative high rate. 
(The pictures make up the 'movie'.) However, you will have to create a lot 
of pictures by using another (scriptable) application. Another downside of 
this technique is that you need a fast computer to be able to display the 
image sequence smoothly. It would be a better solution if you could create a 
video stream of these images and play them directly (I believe the next 
version of EPrime will support video playback.)

Another option is to use some inline scripting to draw the ‘moving’ dot. A 
good starting point is to draw a circle on a so called (off screen) canvas 
and then copy this canvas image on the display. (See Canvas.Circle and 
Canvas.Copy in the EBasic manual. The next step would be to create a 
repeating loop and change the coordinates of the circle as desired.

Hope this is of any help.

Best,
Paul Groot
Vrije Universiteit Amsterdam





>From: "Wendy Davidson" <wendy_davidson79 at hotmail.com>
>To: eprime at mail.talkbank.org
>Subject: moving image
>Date: Wed, 17 May 2006 16:39:30 +0100
>
>Does anyone know if it is possible to have a moving image stimulus on 
>e-prime. If so, any ideas how this is done?
>
>I only need to use a very simple image. Specifically, I need to show a dot 
>moving in a specific direction on the screen, following its short 
>dissappearance, it then reappears and the participant is asked if it is 
>following the same trajectory.
>
>Any help on this would be greatly appreciated.
>
>Thanks in advance
>
>Wendy Davidson
>
>The University of Aberdeen
>Scotland
>
>
>