Dynamic content based on the available resolution
When plotting features linearily along genomic coordinates one frequently runs into the problem of too little resolution to adequatelty display all details. Most genome browsers try to reasonably reduce the amount of detail that is shown based on the current zoomn level.
Most track classes in this package define an internal
collapseTrack method which tries to adjust the plotted content
to the available resolution, aims at reducing overplotting and
prevents rendering issues, e.g. when lines are too thin to be
plotted. This feature can be toggled on or off using the
collapse display parameter (see
details on setting these parameters).
In the simplest case (for
AnnotationTrack objects) this involves expanding
all shown features to a minimum pixel width and height (using
collapsing overlapping annotation items (as defined by the parameter
min.distance into one single item to
For objects of class
DataTrack, the data values
underlying collapsed regions will be summarized based on the
summary display parameter. See the class' documentation for
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