canvas $pathname -wrap 1
in [TCL]
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From: ZB on 6 Jul 2010 19:56 I would to ask: could be possible to add to canvas command an option, which will allow to create "wrapped canvas" - when an object crossing the edge enters the area from the opposite side? What do you think? -- Zbigniew
From: Roger O on 7 Jul 2010 04:46 You can get a callback when the mouse leaves the canvas. Then it is up to that callback to figure out (a) which side of the canvas you left and (b) where you want to go. Will exiting the bottom also take you to the top? I would think not or you would be trapped in the canvas forever! Check out the Tk 'bind' command, with special attention to the <Leave> tag. This is how you know the mouse has left the canvas. IMO, moving the mouse in a program is generally not good interface design. But that detail is yours. Can you even move the mouse in Tk? -- Roger Oberholtzer
From: Uwe Klein on 7 Jul 2010 05:35 Roger O wrote: > You can get a callback when the mouse leaves the canvas. Then it is up > to that callback to figure out (a) which side of the canvas you left > and (b) where you want to go. Will exiting the bottom also take you to > the top? I would think not or you would be trapped in the canvas > forever! > > Check out the Tk 'bind' command, with special attention to the <Leave> > tag. This is how you know the mouse has left the canvas. > > IMO, moving the mouse in a program is generally not good interface > design. But that detail is yours. Can you even move the mouse in Tk? > > -- > Roger Oberholtzer http://faqs.cs.uu.nl/na-dir/tcl-faq/tk/part1.html search for XWarpPointer in page. uwe
From: Andreas Leitgeb on 7 Jul 2010 06:56 Uwe Klein <uwe_klein_habertwedt(a)t-online.de> wrote: > Roger O wrote: >> You can get a callback when the mouse leaves the canvas. > http://faqs.cs.uu.nl/na-dir/tcl-faq/tk/part1.html > search for XWarpPointer in page. I don't think the OP used the word "object" to mean the mouse pointer, but rather to mean canvas-objects (aka "items"). Consider on a 150x100 sized canvas a rectangle with coords 60 60 190 140 As of now, you'd only see a corner (a w90 h40 rectangle) of it, the rest being off-canvas. As I read the OP, with that new option -wrap in place and set to 1, you'd now see the rectangle item's previously off-screen portions wrapped around, resulting in a pattern vaguely like e.g. the danish flag, assuming a red rectangle on white background. My personal opinion is: "not really worth that much trouble", as I believe it would be very complicated to implement, but anyway I hope to have correctly guessed and re-explained the OP's intention.
From: ZB on 7 Jul 2010 11:56
Dnia 07.07.2010 Andreas Leitgeb <avl(a)gamma.logic.tuwien.ac.at> napisa�/a: > My personal opinion is: "not really worth that much trouble", > as I believe it would be very complicated to implement, but > anyway I hope to have correctly guessed and re-explained > the OP's intention. Yes, exactly; and I was wondering, would it be really that much trouble with implementation? -- Zbigniew |