| Description: |
allows to select the fisheye views. Because of the fixed size of the
window that shows the graph, we normally can only see a small amount of a large graph. If we shrink the graph such that it
fits into the window, we cannot recognize any detail anymore. Fisheye views are coordinate transformations: the view onto
the graph is distort, to overcome this usage deficiency. The polar fisheye is easy to explain: assume a projection of the
plane that contains the graph picture onto a spheric ball. If we now look onto this ball in 3 D, we have a polar fisheye view.
There is a focus point which is magnified such that we see all details. Parts of the plane that are far away from the focus
point are demagnified very much. Cartesian fisheye have a similar effect; only the formula for the coordinate transformation
is different. Selecting cfish means the cartesian fisheye is used which demagnifies such that the whole graph is visible (self
adaptable cartesian fisheye). With fcfish, the cartesian fisheye shows the region of a fixed radius around the focus point
(fixed radius cartesian fisheye). This region might be smaller than the whole graph, but the demagnification needed to show
this region in the window is also not so large, thus more details are recognizable. With pfish the self adaptable polar fisheye
is selected that shows the whole graph, and with fpfish the fixed radius polar fisheye is selected.
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