Canvas questions to load images
Corona
shunyata.aishwarya at gmail.com
Tue Sep 18 01:18:52 UTC 2012
Follow up question:
Is there a substitute for stretch property in canvas?
Thanks,
Corona
On Monday, September 17, 2012 6:13:45 PM UTC-4, Corona wrote:
>
> Thanks David.
>
> I have finally managed to load my images, with the script as follows:
>
> Dim myRect As Rect
>
> XRes = 1280
> YRes = 768
>
> 'define source rect as full screen
> src.Left = 0
> src.Top = 0
> src.Right = Display.Xres
> src.Bottom = Display.Yres
>
> 'define destination rect as top left quadrant
> dest.Left = 120
> dest.Top = 180
> dest.Right = Display.Xres + 424
> dest.Bottom = Display.Yres + 283
>
> 'Canvas codes follows
>
> My question is, how do the images appear (without fully covering the
> screen), given that my dest.Right and dest.Bottom variables are greater
> than the
> set pixel co-oordinates in the E-Prime system?
>
> On Monday, September 17, 2012 5:05:20 PM UTC-4, McFarlane, David wrote:
>>
>> Corona,
>>
>> Addressing only point (2): If you do that, then square images (e.g.,
>> 100 x 100) will not be square on your display (please do not take my
>> word for this, measure it for yourself). At least, that is what
>> happened to us.
>>
>> Only after contacting PST Web Support did I learn that, with EP2, you
>> are not restricted to the resolution options in the dropdown menu,
>> you may manually enter any values you like there and as long as they
>> are valid for your display hardware EP2 will use it. Better yet,
>> with EP2, set Display resolution to "Match desktop resolution at
>> runtime", then set your desired display resolution in Windows, and
>> EP2 will just use that. Simple.
>>
>> Of course, this does not work for EP1, in which case you are sunk.
>>
>> -----
>> David McFarlane
>> E-Prime training
>> online: http://psychology.msu.edu/Workshops_Courses/eprime.aspx
>> Twitter: @EPrimeMaster (https://twitter.com/EPrimeMaster)
>>
>>
>> At 9/17/2012 01:13 PM Monday, Corona wrote:
>> >Thank you all for your help so far. I have been reading a few posts
>> >on resolving image dimension issues. Here is what I have done so far:
>> >
>> >1) My system resolution is 1280 x 800
>> >
>> >2) I went to e-prime->experiment->devices->display->edit->and
>> >changed to 1280 x 768 (I do not have 800 as a drop down option).
>> >
>> >3) My images have uniform pixel dimensions of 424 x 283 (bmp images).
>> >
>> >4) I am using canvas object given the large number of images I have:
>> >
>> >After loading the offscreen canvas, my script (based on a previous
>> >response to my question) is as shown below:
>> >
>> >xMargin = 120
>> >yMargin = 120
>> >
>> >myRect.Left = xMargin
>> >myRect.Right = xMargin + 424
>> >myRect.Top = yMargin
>> >myRect.Bottom = ymargin + 283
>> >
>> >However, this caused my images to be cropped. I played around with
>> >the numbers for xMargin, but did not get any satisfactory results
>> >(images are cropped on either length or width).
>> >
>> >Then, I resorted to trying this:
>> >
>> >XRes = 1280
>> >YRes = 768
>> >
>> >'define source rect as full screen
>> >src.Left = 120
>> >src.Top = 120
>> >src.Right = Display.XRes
>> >src.Bottom = Display.YRes
>> >
>> >'define destination rect as top left quadrant
>> >dest.Left = 120
>> >dest.Top = 120
>> >dest.Right = 120 + Display.XRes + 424
>> >dest.Bottom = 120 + Display.YRes + 283
>> >
>> >This yielded better results, but my images are still cropped. What
>> >am I missing here? I changed screen dimensions on e-prime to
>> >approximately"match" my system's resolution, but still not getting
>> >the results I desire.
>> >
>> >Thank you again for your input,
>> >Corona
>> >
>> >On Sunday, September 16, 2012 2:18:01 PM UTC-4, Corona wrote:
>> >Thank you. I had looked at the site link you've given, but it was
>> >more a problem of running the validation tool that was failing
>> >(although I do have an original Vista version). Apparently, the
>> >error I encountered is quite common (or so, the Microsoft user
>> >forums suggest). I however, found a roundabout way, which may be
>> >useful for
>> >others:
>> ><http://download.cnet.com/Help-Explorer-Viewer/3000-6675_4-10666661.html
>> >http://download.cnet.com/Help-Explorer-Viewer/3000-6675_4-10666661.html
>> >. This software application works as a reader for .hlp files.
>> >
>> >Thank you for your suggestions. Now that I have the E-Basic help
>> >showing up(or visible), I can at least look it up.
>> >
>> >Corona.
>> >
>> >On Sunday, September 16, 2012 1:43:51 PM UTC-4, J wrote:
>> >This should help with viewing help files in Windows Vista (as a
>> >novice e-basic programmer, I have to say that access to E-Basic Help
>> >is essential).
>> >
>> ><http://support.microsoft.com/kb/917607>
>> http://support.microsoft.com/kb/917607
>> >
>> >J
>> >
>> >On 9/16/2012 11:36 AM, Corona wrote:
>> >>Thank you. I do not have access to the e-prime basic help, due to
>> >>running a Windows-Vista, 64-bit system. .hlp files are no longer
>> >>recognized by Vista-32. I tried installing a tool that allows .hlp
>> >>files to be read, but it somehow failing. Is there a workaround to
>> >>this, so I can view the e-prime basic files?
>> >>
>> >>Thanks,
>> >>Corona
>> >>
>> >>On Sunday, September 16, 2012 11:39:37 AM UTC-4, Peter Quain wrote:
>> >>
>> >>I cannot think of why might else you would crave this knowledge.
>> >>The documention, topic Canvas, will help understanding this code,
>> >>you will need to if it is Canvas that you wish to use
>> >>
>> >>At 01:31 AM 17/09/2012, you wrote:
>> >>>Thank you Alphonse, for the quick reply. More for the purpose of
>> >>>understanding the code, than anything else, why do you
>> >>>repeat cnvs.Copy offScreenCnvs, myRect, myrect (with myrect
>> >>>twice)? More specifically, how is this understood by e-prime?
>> >>>Also, I am guessing I do not have to include a slideobject?
>> >>>
>> >>>
>> >>>
>> >>>On Sunday, September 16, 2012 10:59:26 AM UTC-4, alphonse wrote:
>> >>>-----------------------------------------------
>> >>>'Prepare stimulus offscreen
>> >>>offScreenCnvs.LoadImage stim
>> >>>'Define the copy area
>> >>>Dim myRect As Rect
>> >>>myRect.Left = xMargin
>> >>>myRect.Right = xMargin + 60
>> >>>myRect.Top = yMargin
>> >>>myRect.Bottom = yMargin + 60
>> >>>'Copy prepared stimulus to screen
>> >>>cnvs.Copy offScreenCnvs, myRect, myRect
>> >>>--------------------------------------------------------------------------
>>
>> >>>At 12:39 AM 17/09/2012, you wrote:
>> >>>>I am currently running a dot probe task with visual paired
>> >>>>stimuli (positive, negative). I have a two fold question
>> >>>>pertaining to this task:
>> >>>>1) I have about 60 images in one of my trialprocs, and was
>> >>>>therefore advised to use the canvas option to preload images. I
>> >>>>have had little success with using this object, particularly
>> >>>>because I do not entirely understand the concepts of off-screen
>> >>>>and on-screen canvas. I have managed to write a small script with
>> >>>>help from the references guides posted on the e-prime website (as
>> >>>>well as forums), but am stuck when it comes to the following
>> statement:
>> >>>>1. When preparing the trial:
>> >>>>
>> >>>>targetCanvas.LoadImage stim
>> >>>>
>> >>>>Image is loaded to the top left corner. We need to define 2 Rect
>> >>>>Objects: StimLoadRect and StimRect (see Rect object in the
>> >>>>E-Basic Help), both the size of the images to-be-loaded, but the
>> >>>>StimRect at the (Left,Right, Top,Bottom) coordinates where the
>> >>>>stimulus will be displayed. When we copy the image from the
>> >>>>offline canvas to the online canvas, we will copy from
>> >>>>StimLoadRect to StimRect.
>> >>>>
>> >>>>2. To run the stimulus:
>> >>>>
>> >>>>Display.WaitForVerticalBlank
>> >>>>c.setAttrib "StimOnset", clock.read
>> >>>>cnvs.copy targetCanvas, stimLoadRect, stimRect
>> >>>>sleep(stimDuration)
>> >>>>Display.WaitForVerticalBlank
>> >>>>Cnvs.clear ' or something else that erases the stimulus, can be
>> >>>>done in the following trial
>> >>>>
>> >>>>
>> >>>>Bolded lines: How do I create a stimLoadRect and stimRect image,
>> >>>>a is asked for? (I did find a script for creating a rect object,
>> >>>>but am unsure of how to specify dimensions).
>> >>>>I assume that pre-defining images and their locations, means I do
>> >>>>not have to specify them as a SlideObject? (I am guessing I am
>> >>>>completely wrong here - please feel free to correct me) . I would
>> >>>>also assume that the stimDuration, must be defined as an attribute?
>> >>>>
>> >>>>Assuming I do not have to go through this convoluted path, I have
>> >>>>another question. If I could pre-load using the SlideImage and
>> >>>>ImageDisplay options, I am not sure how to specify the
>> >>>>co-ordinates of where I want my image to be in the properties
>> >>>>section. I know this appears elementary, but the actual size of
>> >>>>the images are 424 X 283, but when running, part of the images
>> >>>>are cut off. When I looked at the properties of my slide object,
>> >>>>I had set the width at 25% . I assumed this was the co-ordinate
>> >>>>location in relation to the actual screen size. Guessing that
>> >>>>this was an error on my part, I reset the width to 100%, but that
>> >>>>meant that when I looked at the slideobject (with the dotted
>> >>>>grid), one image seemed to complete cover the other image. How do
>> >>>>I fit both images, and make sure their dimensions remain the same?
>> >>>>I apologize for this rant. I only recently switched to e-prime
>> >>>>from using Inquisit, and am still trying to get a hang of this
>> software tool.
>> >>>>Thanks a ton for your reply,
>> >>>>Corona
>>
>>
--
You received this message because you are subscribed to the Google Groups "E-Prime" group.
To post to this group, send email to e-prime at googlegroups.com.
To unsubscribe from this group, send email to e-prime+unsubscribe at googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msg/e-prime/-/CBZok5cGpkoJ.
For more options, visit https://groups.google.com/groups/opt_out.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listserv.linguistlist.org/pipermail/eprime/attachments/20120917/76fd8a77/attachment.htm>
More information about the Eprime
mailing list