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#### A.4.13.1 Corner Navigation

Navigation actions in the corner plot are the same as for the Plane Plot; you can pan and zoom on each panel in the grid of plots using the mouse. However in this case the action will affect not only the panel that you are pointing at, but all the other panels in the same row and the other panels in the same column, so that the horizontal and vertical axes stay consistent per row and per column.

Using the mouse to drag and zoom on one axis only, rather than both at once, by positioning it just outside the bounds of one of the panels (e.g. between panels) as described below, can be particularly useful in this plot.

The navigation actions are:

Left drag
  Pan. On the body of the plot this moves it around up/down/left/right. To move it only vertically, drag on the left of the Y axis or between panels in a row. To move it only horizontally, drag below the X axis or between panels in a column. You can configure dragging on the body of the plot to be only vertical or horizontal by setting the Pan/Zoom Axes in the Navigation axis configuration tab.
Right drag (CTRL-drag)
  Stretch zoom. On the body of the plot, dragging up/down stretches/squashes the plot vertically, and dragging left/right stretches/squashes it horizontally. Zooming is around the mouse position at the start of the drag. To zoom only vertically, drag on the left of the Y axis or between panels in a row. To zoom only horizontally, drag below the X axis or between panels in a column.
Center drag (SHIFT-drag)
  Frame zoom. On the body of the plot, dragging right-and-down or right-and-up drags out a frame; when the button is released, the plot will be zoomed in to cover the area enclosed by the frame. Dragging left (and up or down) does something like the opposite, you can zoom out using a similar (though not quite the same) mechanism. To zoom in/out only horizontally, drag right/left below the X axis or between panels in a column. To zoom in/out only vertically, drag up/down on the left of the Y axis or between panels in a row.
Wheel
  Isotropic zoom. Spinning the mouse wheel forwards/backwards will zoom in/out around the mouse position, just like dragging with the right button up-and-right or down-and-left.
Left click
  Select. If there is a plotted point near the cursor, it will plot a marker on it and activate it. This includes causing the marker to show up in all the other visible panels of the plot grid, not just the one you clicked on.

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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