How do I add grid lines at the major or minor tick positions?
The majortick.grid and minortick.grid sections of the axis attribute settings control the appearance of grid lines:
chips> get_xaxis().majorgrid
color = default
style = 6
thickness = 1.0
visible = False
chips> get_xaxis().minorgrid
color = default
style = 2
thickness = 1.0
visible = False
The set_axis set of commands can be used to show, or hide, the grids. In the following we turn on just the major grid and then both grids for both axes; if set_xaxis or set_yaxis had been used then this would have been limited to the X or Y axis respectively.
chips> set_axis(["majortick.visible", True]) chips> set_axis(["majortick.visible", True, "minortick.visible", True])
Here are two examples taken from the ChIPS gallery:
![[The X axis is logged and the Y axis is linear; both have blue dotted grid lines at the minor tick positions and black dashed lines at the major grid positions]](../gallery/images/axes.grids.xlog.png)
![[The contoured image of Abell 2142 is displayed in WCS coordinates and a brown dashed line is drawn at the major tick positions for both axes]](../gallery/images/contour.wcs.png)
The ChIPS GUI
The ChIPS GUI makes it easy to modify a visualization using your mouse, rather than Pythoon functions. New in CIAO 4.5 is the ability to add annotations - such as labels, lines, points and regions - directly from the GUI.
