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#### A.5.5.1 3D Plot Style Editor

When plotting points in a 3D plot there are many different ways that each point can be displayed. By default, TOPCAT chooses a set of markers on the basis of how many points there are in the table and uses a different one for each plotted set. The marker for each set is displayed in a button to the right of its name in the dataset selector panel at the bottom of the plot window. If you click this button the following dialogue will pop up which enables you to change the appearance.

Style editor dialogue for 3d plots

The Legend box defines how the selected set will be identified in the legend which appears alongside the plot (though the legend will only be visible if Show Legend () is on):

Icon
  Displays the icon which will be shown to identify the points in the selected set. Its appearance depends on the selections you make in the rest of this dialogue window.
Label
  Gives the name written in the legend to label the subset. By default this is derived from the Row Subset's name and, if it's not part of the main dataset, the name of the dataset's tab. You can type in a new value to change what is written in the legend.
Hide Legend
  If this checkbox is selected, then no entry for the selected set will appear in the legend.

The Marker box defines how the markers plotted for each data point will appear:

Shape
  Choose from a variety of shapes such as open or filled circles, squares, crosses etc.
Size
  Choose the size of the marker; the value given is approximate radius in pixels. If a size of zero is chosen, then the shape doesn't matter, the points will be plotted as single pixels.
Colour
  Choose the colour in which the markers will be plotted.
Transparency
  Choose transparency of the plotted symbols. The scale on the slider is logarithmic, with 1 at the left hand end. The actual value chosen is an integer written at the right of the slider. This number gives the number of markers for this set which need to be plotted in the same position to result in fully opaque pixels - any fewer and the background, or other markers plotted underneath, will show through to some extent. Setting this to some value greater than 1 is very useful if you have a very large number of points being plotted (especially if it's comparable with the number of the pixels on the screen), since it enables to you distinguish regions where there are lots of points on top of each other from those where there are only a few. If a finite transparency is set, you may find it useful to turn off fogging (see above).
Error Bars
  If error bars are active for this plot, allows you to select the way they will appear. The options which can be selected here will depend on whether X, Y and/or Z errors are in use.
Hide Markers
  This check box is only enabled if error bars are being plotted; it allows the markers to be invisible, so that only the error bars are seen.

Any changes you make in this window are reflected in the plot straight away. If you click the OK button at the bottom, the window will disappear and the changes remain. If you click Cancel the window will disappear and any changes you made will be discarded.

You can also change all the plotting styles at once by using the Marker Style menu in the plot window. Here you can select a standard group of styles (e.g. all open 2-pixel markers with different colours and shapes) for the plotted sets. Similarly, error styles can be changed all at once using the Error Style menu.

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TOPCAT - Tool for OPerations on Catalogues And Tables
Starlink User Note253
TOPCAT web page: http://www.starlink.ac.uk/topcat/
Author email: m.b.taylor@bristol.ac.uk
Mailing list: topcat-user@jiscmail.ac.uk