Image on canvas
in [TCL]
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From: Kevin Walzer on 10 Jun 2010 22:36 I'm trying to create a canvas that simply displays an image, but I'm running into some difficulty with defining the image coordinates so the image is fully displayed. Here's some sample code: image create photo foo -file foo.png pack [canvas .c -height [image height foo] -width [image width foo] -fill both -expand no ..c create image 0 0 -tags item -image foo This results in part of the image being displayed, part being cut off. I've tried various coordinates, but I can't figure this out. Is there a way to programatically set the coordinates of the image so it fully displays, centered in the canvas (the canvas' height and width are set to the same height and width of the image)? Thanks, Kevin -- Kevin Walzer Code by Kevin http://www.codebykevin.com
From: Kevin Walzer on 10 Jun 2010 22:53 On 6/10/10 10:36 PM, Kevin Walzer wrote: > I'm trying to create a canvas that simply displays an image, but I'm > running into some difficulty with defining the image coordinates so the > image is fully displayed. Here's some sample code: > > image create photo foo -file foo.png > > pack [canvas .c -height [image height foo] -width [image width foo] > -fill both -expand no > > .c create image 0 0 -tags item -image foo > > This results in part of the image being displayed, part being cut off. > I've tried various coordinates, but I can't figure this out. > > Is there a way to programatically set the coordinates of the image so it > fully displays, centered in the canvas (the canvas' height and width are > set to the same height and width of the image)? > > Thanks, > Kevin Looks like .c create image 0 0 -tags item -image foo -anchor nw (for the upper left-hand corner) does the trick just fine. -- Kevin Walzer Code by Kevin http://www.codebykevin.com
From: Aric Bills on 10 Jun 2010 22:57
On Jun 10, 8:53 pm, Kevin Walzer <k...(a)codebykevin.com> wrote: > On 6/10/10 10:36 PM, Kevin Walzer wrote: > > > > > I'm trying to create a canvas that simply displays an image, but I'm > > running into some difficulty with defining the image coordinates so the > > image is fully displayed. Here's some sample code: > > > image create photo foo -file foo.png > > > pack [canvas .c -height [image height foo] -width [image width foo] > > -fill both -expand no > > > .c create image 0 0 -tags item -image foo > > > This results in part of the image being displayed, part being cut off. > > I've tried various coordinates, but I can't figure this out. > > > Is there a way to programatically set the coordinates of the image so it > > fully displays, centered in the canvas (the canvas' height and width are > > set to the same height and width of the image)? > > > Thanks, > > Kevin > > Looks like .c create image 0 0 -tags item -image foo -anchor nw (for the > upper left-hand corner) does the trick just fine. > > -- > Kevin Walzer > Code by Kevinhttp://www.codebykevin.com For completeness, also add -borderwidth 0 -highlightthickness 0 to the canvas options. |