Collectors
Revision as of 09:43, 16 January 2009 by 132.166.16.106 (talk)
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Collectors are an alternative to overlays that can be used to build-up composite objects. Layers, on the other hand, are used to define whole pages. See the details manual for further explanations.
Example
Adding labels to a figure.
\starttext \definecollector[example] \setcollector [example] {\externalfigure[cow][width=4cm,frame=on]} \setcollector [example] [corner={right,bottom},location={left,top}] {\framed{1}} \setcollector [example] [corner={right,top},location={left,bottom}] {\framed{2}} \setcollector [example] [corner={left,top},location={right,bottom}] {\framed{3}} \setcollector [example] [corner={left,bottom},location={right,top}] {\framed{4}} \startTEXpage \composedcollector{example} \stopTEXpage \stoptext |
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There is no confusion if the added text is placed within the first object. However,
\starttext \definecollector[example2] \setcollector [example2] {\externalfigure[cow][width=4cm,frame=on]} \setcollector [example2] [corner={right,bottom},location={right,bottom}] {\framed{1}} \setcollector [example2] [corner={right,top},location={right,top}] {\framed{2}} \setcollector [example2] [corner={left,top},location={left,top}] {\framed{3}} \setcollector [example2] [corner={left,bottom},location={left,bottom}] {\framed{4}} \startTEXpage \composedcollector{example2} \stopTEXpage \stoptext |
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Notice that the size of the collected object grows as text is added. As a consequence, the positions of the corners get redefined as the bounding box grows.