goocanvas-devel

[Goocanvas-devel] goocanvasmm set_bounds

[Robert G. <do...@gm...>]

Hi all,

first of all thanks for these widgets, really very useful library.

I'm not sure if this list also covers goocanvasmm related stuff,
but i couldn't find any specific one for it.

I'm trying to change the start/end positions of a Goocanvas::Polyline. As
far as i've understood set_bounds() and get_bounds() can be used
for this purpose.

Here's how i tried to do it:

        Goocanvas::Bounds bounds = connection->get_bounds();
        bounds.set_x2(this->get_bounds().get_x1());
        bounds.set_y2(this->get_bounds().get_y1());
        connection->set_bounds(bounds);
        connection->request_update();

connection is a Class derived from Goocanvas::Polyline.
the containing class derives from Goocanvas::Rect

This code doesn't change the shape of the line.
Calling connection->set_simple_transform() however does change
the position of the whole line, but what i'd need to do is to only
change the x1/y1 or x2/y2 coordinate of it.

thanks for your help!


-robert

Re: [Goocanvas-devel] goocanvasmm set_bounds

[Damon C. <da...@ka...>]

On Wed, 2008-05-21 at 03:08 +0200, Robert Gruendler wrote:
> Hi all,
> 
> first of all thanks for these widgets, really very useful library.
> 
> I'm not sure if this list also covers goocanvasmm related stuff,
> but i couldn't find any specific one for it.
> 
> I'm trying to change the start/end positions of a Goocanvas::Polyline.
> As
> far as i've understood set_bounds() and get_bounds() can be used
> for this purpose.
> 
> Here's how i tried to do it:
> 
>         Goocanvas::Bounds bounds = connection->get_bounds();
>         bounds.set_x2(this->get_bounds().get_x1());
>         bounds.set_y2(this->get_bounds().get_y1());
>         connection->set_bounds(bounds);
>         connection->request_update();
> 
> connection is a Class derived from Goocanvas::Polyline.
> the containing class derives from Goocanvas::Rect
> 
> This code doesn't change the shape of the line.
> Calling connection->set_simple_transform() however does change
> the position of the whole line, but what i'd need to do is to only
> change the x1/y1 or x2/y2 coordinate of it.

In C I think you could get the polyline's "points" property, change the
array of point coordinates, and then set it back. I guess that would
also work in C++.

Damon

Re: [Goocanvas-devel] goocanvasmm set_bounds

[Robert G. <do...@gm...>]

thanks, altering the points array did the trick


-robert

On Wed, May 21, 2008 at 10:11 AM, Damon Chaplin <da...@ka...>
wrote:

>
> On Wed, 2008-05-21 at 03:08 +0200, Robert Gruendler wrote:
> > Hi all,
> >
> > first of all thanks for these widgets, really very useful library.
> >
> > I'm not sure if this list also covers goocanvasmm related stuff,
> > but i couldn't find any specific one for it.
> >
> > I'm trying to change the start/end positions of a Goocanvas::Polyline.
> > As
> > far as i've understood set_bounds() and get_bounds() can be used
> > for this purpose.
> >
> > Here's how i tried to do it:
> >
> >         Goocanvas::Bounds bounds = connection->get_bounds();
> >         bounds.set_x2(this->get_bounds().get_x1());
> >         bounds.set_y2(this->get_bounds().get_y1());
> >         connection->set_bounds(bounds);
> >         connection->request_update();
> >
> > connection is a Class derived from Goocanvas::Polyline.
> > the containing class derives from Goocanvas::Rect
> >
> > This code doesn't change the shape of the line.
> > Calling connection->set_simple_transform() however does change
> > the position of the whole line, but what i'd need to do is to only
> > change the x1/y1 or x2/y2 coordinate of it.
>
> In C I think you could get the polyline's "points" property, change the
> array of point coordinates, and then set it back. I guess that would
> also work in C++.
>
> Damon
>
>