[NTG-context] absolute positioning of figures

andrea valle valle at di.unito.it
Fri Oct 13 16:33:28 CEST 2006



> 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?

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