[Sugar-devel] [Karma] Re: progress and issues w/ adding_up

[Felipe López Toledo]

>
> I think it could be useful to rename klayer to KArea or KZone, an object
> that gives u easy access to the canvas and context.
>
I like the objective, but I dislike the name.

I think it could be useful to rename klayer to KArea or KZone, an object
> that gives u easy access to the canvas and context. We would also need
> this object later when we try to save its image state, i.e. save what
> has been drawn so we can come back they don't lose everything that has
> happened on the canvas. I am talking about save() and restore() in a
> more complex and powerful way than ctx.save() or ctx.restore(), which
> only save the drawing state.
>
I think, you're referring to "saving"  like taking a canvas snapshot and
"restoring" it, rigth?

2009/9/3 Bryan Berry <bryan at olenepal.org>

> also another issue i have is that I can't attach a kbutton to a specific
> context. I hacked it by adding the event listener directly to the canvas
> element.
>
> I think it could be useful to rename klayer to KArea or KZone, an object
> that gives u easy access to the canvas and context. We would also need
> this object later when we try to save its image state, i.e. save what
> has been drawn so we can come back they don't lose everything that has
> happened on the canvas. I am talking about save() and restore() in a
> more complex and powerful way than ctx.save() or ctx.restore(), which
> only save the drawing state.
>
> also, with KArea or KZone, we could use that object to move the html
> element around, be shrink it, reposition it on the page.
>
> On Thu, 2009-09-03 at 17:56 +0545, Bryan Berry wrote:
> > I have adding_up kind of working w/ the new html layout, but it doesn't
> > actually add up to the correct sum :(
> >
> > Problem #1
> >
> > I kept getting an infinite loop in this section in the distance2() call
> >
> > I have to admit I don't exactly understand what distance2 is doing
> >
> http://git.sugarlabs.org/projects/karma/repos/mainline/blobs/multicanvas/examples/adding_up_to_10/js/lesson.js#line142
> >
> > for ( var j=0; j<pos.length; j++) {
> >       if ( k.geometry.distance2( pos[j], {"x": x, "y": y} ) < 80 ) {
> flag
> > = true;
> >       break; }  }
> > }while ( flag === true );
> > pos.push( { "x":x, "y": y } );
> > k.library.images[ imgId ].draw(ctx, x, y )}
> >
> > Also, i don't understand how u can call distance2 w/ pos[j] when pos is
> > still an empty array. Maybe it is because js just does a lot of weird
> > stuff.
> >
> > Problem #2
> >
> > None of the answer boxes holds the correct sum :(
> >
> > I am not sure where the logic error is but I am hunting for it!
> >
> > as we discussed yesterday, i have put all this work on the "multicanvas"
> > tree.
> > http://git.sugarlabs.org/projects/karma/repos/mainline/trees/multicanvas
> >
> >
> --
> Bryan W. Berry
> Technology Director
> OLE Nepal, http://www.olenepal.org
>
>


-- 
Felipe López Toledo
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