Switches free rotating animation on or off. If animation is on, a left-mouse-click-drag event invokes the animation. A single left-mouse-click-release with no mouse movement stops the animation.

Translations of the sphere centre away from the rotation centre are currently disabled, so the centre control essentially has no effect at all.

Reciprocal lattice axes are currently drawn through the centre of the diffraction sphere. Occasionaly this can obscure reflections in axial planes. Selecting the AXES control moves the axes to a more extraneous position.

Switching on perspective can highlight symmetry axes of reciprocal space. Perspective works in two ways, to reduce the size of reflection markers due to viewing distance, and to cause apparent convergence of lattice points with viewing distance.

Two modes of reciprocal space viewing are possible. The default method ignores viewing distance of the reciprocal lattice vectors and simply plots all reflections in planes from Hmin up to Hmax. The second method attempts to draw the sphere from furthest reflection, to closest by partitioning reciprocal space into thin slices according to depth and plotting all points which fall within the range of each slice. This method is significantly slower and occasionaly misses some reflections, while drawing others more than once. Not recommended for general use unless you want to print the current view, in which case depth sorting is an advantage.

This command activates a slider control in the message window enabling the global reflection scale factor to be adjusted from 0.0 to 0.5, which scales the size of all reflection markers up or down by the same amount. Use the right mouse button to adjust the value of the slider. Reselect PEAK MAX to cancel this mode.

The PEAK SCAL command activates a slider control in the message window scaling the relative difference in size of strong and weak reflections. A value of 1.0 gives the largest differences and anything less than 0.5 is indistinguishable from "no difference at all". Use the right mouse button to adjust the value of the slider. Reselect PEAK SCAL to cancel this mode.

Depending on the contents of the archive lrrefl: reflection record and the stage of data processing at which GIP is invoked, up to four options maybe available when selecting DIFFERENCE mode, - namely:

If there is only one option available owing to bdf contents, it will be invoked immediately without going through the intermediate menu selection.

In INFO mode, the right mouse button can be used by click-drag events to view archive information associated with a given reflection in reciprocal space. Reselect INFO to cancel this mode. Note that INFO has not been configured to operate correctly when PERSPECTIVE is on.

The HIDE control can be used to hide or redisplay all reflections belonging to a given colour class. Select HIDE and then select the color range (from the top-right color range boxes) to be hidden or redisplayed. Hiding all RCODE 1 reflections for instance can highlight systematically absent rcode 2 reflections, which may be useful in identifying space group symmetry.

This command activates a slider control in the message window enabling the minimum and maximum sin θ/λ values to be adjusted to highlight a particular shell of reciprocal space. Reselect the RADIUS button to cancel this mode.

This command activates a slider control in the message window enabling adjustment of the minimum and maximum intensity range to be displayed. Reselect the INT RANGE control to cancel this mode.

This command is analogous to INFO mode in that it begins by permitting the user to identify a reflection using right-mouse-click-drag events. Having identified a suitable reflection, the Ewald multiple scattering sphere for that reflection at the diffractometer measurement angle is illustrated by reselecting the EWALD control. The veracity of this representation relies on the presence of the crystal based azimuthal ψ angle to abstract away from crystal orientation and diffractometer specifics. Reflections lying on or near the surface of this sphere can be identified by invoking INFO mode using right-click-drag events to identify reflections. Alternatively, middle-mouse-click-drag events can be used to rotate the Ewald sphere about the scattering vector for the selected reflection. Ewald mode can be cancelled by reselecting the EWALD control

Selecting the PLANES control button offers up a selection of six different modes for identifying specific reciprocal latice planes for display.

PLANES mode can be switched off by reselecting the PLANES control button.

Selecting this control button reveals a selection of controls in the message panel, for choosing between the different lrrefl: bdf items which are supported for display as colour or size prperties. Choose one of the options or cancel the change by reselecting the REFL PROP control.

This control displays a multiway slider bar in the message window for enabling relatively coarse grained adjustments to the colour ranges. Colour range changes do not take effect immediately, but only after the EDIT RANGE control has been reselected to exit edit mode.

This control has no functionality.

The PRINT control adds a dump of the current screen view to the .gip file. Multiple prints can be invoked per GIP session and they accumulate as multiple frames for display, editing and printing using PLOTX and PREVUE.

The function of this control is rather obvious. Given the non-critical nature of this program, there is no safety net for accidental exit.