Re: Layers again

[Ian Lawrence <physics.rooted@gmail.com>]

OK, now maybe I get it. This might help someone...


It's the **contents** of the layer that get repeated if you set
repeat=yes in \definelayer - as in
http://wiki.contextgarden.net/Layers

If you do a \setlayer then this simply adds to the existing stack of
contents displayed on the layer.  You get more and more stuff until
you do a \resetlayer, assuming you set  repeat=yes in the
\definelayer. Thus(?) \definelayer is all about the contents of the
layer (? Apart from setting the dimensions and so on... I think that's
what deflected me into thinking that this command was about the
canvas, and the \setlayer about the contents.)

The \setupbackgrounds[page][state=repeat,background={XXX}] is the
command that puts the logical layer on each page.

If this seems about right then I'll have a go at adding a sentence or
two to the wiki...maybe on-one else thinks of it in terms of the
existence and then the population of a layer...?


On 26 April 2011 17:44, Hans Hagen <pragma@wxs.nl> wrote:
> On 26-4-2011 6:26, Ian Lawrence wrote:
>
>
>> But when I get to a new page I'd like to be able to change that plug,
>> or even have the layer blank
>
> that happens automatically unless the state of the layer is set to 'repeat'
>
> so normally, once a layer is placed its content is forgotten
>
>> \page[yes]
>>
>> \setlayer       [SPTinteractivemedium]  % name of the layer
>>                [hoffset=0px, voffset=0px,]  % placement (from upper left
>> corner of the layer)
>>                { \externalfigure [dummy][width=100px]}  % the actual
>> contents of the layer
>>
>> And;
>>
>> \page[yes]
>> \setlayer       [SPTinteractivemedium]  % name of the layer
>>                [hoffset=0px, voffset=0px,]  % placement (from upper left
>> corner of the layer)
>>                { \externalfigure ??????? }  % HOW TO SET THE
>> \externalfigure to
>> NOTHING, or hide the layer?
>
> \resetlayer [SPTinteractivemedium]
>
>> I might try changing the backgrounds on a page by page basis, but this
>> seems inelegant, as the \setups ought to be before the \starttext..?
>
>
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