Re: absolute positioning of figures

[Peter Rolf <indiego@gmx.net>]

Hi Andrea,

andrea valle wrote:
> 
>> On 13 Oct 2006, at 00:00, Hans Hagen wrote:
>>> indeed, layers put in overlays (there can be many layers on top of 
>>> each
>>> others
>>>
>>
> 
> 
> Now, I tried with overlays and layers. That's fine. In any case, in a 
> second approach I simply used \setlayer to fill repeatedly the same 
> layer. The result seems to be the same.
>   What's the difference? Is it safe to use the second approach?
>
Using different layers, you can change the order of appearance
(background={1,2,3}|{1,3,2},..) for the layer content.
Using only one layer, all layer content is placed stack like; the
printing order is then fixed by the appearance order in the document
(last overprints prior).

> Then: changing layer dimension in \definelayer, I cannot see any 
> differences in the output.
> Can anyone explain what it should happen?

I think the size is significant, if you use relative positioning
(preset=bottomright and alike).

Greetings, Peter

> Thanks
> 
> Best
> 
> -a-
> 
> Two examples follow:
> 
> \setupcolors[state=start]
> 
> 
> % first approach
> 
> \definelayer    [layer1][]
> \definelayer    [layer2][]
> \definelayer    [layer3][]
> 
> \setlayer       [layer1]
>                  [x=.5\paperwidth, y=.5\paperheight]
>                  {\externalfigure[layTest][]}
> 
> 
> 
> \setlayer       [layer2]
>                  [x=.35\paperwidth, y=.45\paperheight]
>                  {\externalfigure[layTest][]}
> 
> 
> \setlayer       [layer3]
>                  [x=.5\paperwidth, y=.5\paperheight]
>                  {\color[darkred]{ \bf This is a text}}
> 
> 
> \defineoverlay[overlay1][{\placelayer[layer1]}]
> \defineoverlay[overlay2][{\placelayer[layer2]}]
> \defineoverlay[overlay3][{\placelayer[layer3]}]
> 
> % end of first
> 
> 
> % second approach
> \definelayer    [layer1b][]      % just one
> 
> \setlayer       [layer1b]
>                  [x=.5\paperwidth, y=.5\paperheight]
>                  {\externalfigure[layTest][]}
> 
> 
> 
> \setlayer       [layer1b]
>                  [x=.35\paperwidth, y=.45\paperheight]
>                  {\externalfigure[layTest][]}
> 
> 
> \setlayer       [layer1b]
>                  [x=.5\paperwidth, y=.5\paperheight]
>                  {\color[darkred]{ \bf This is a text}}
> 
> 
> % end
> 
> 
> \starttext
> 
> % using first
> \framed [height=\textheight,width=\textwidth,background={overlay1, 
> overlay2, overlay3},align=right, frame=off]
> {
> % write if you need to
> }
> 
> 
> % using second
> 
> \framed 
> [height=\textheight,width=\textwidth,background=layer1b,align=right, 
> frame=off]
> {
> % write if you need to
> }
> 
> 
> \stoptext
> 
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