Scaling
Previous  Top  Next

Dialog Box - called from: Input2 Menu

Scaling and displacement operations do not apply to the actual values of atom and corner coordinates and face coefficients, which are permanently set (in Angstroms) by axis lengths and fractional coordinates and the central distances of the faces. Rescaling and displacement apply only to the plotting coordinates in screen, dot-matrix or pen-plotter displays.

Scale mode. There are three modes of scaling:

----Maximize size for each view. In this mode, the structure is scaled in each orientation so that it is just smaller than the viewing area. The actual scale will therefore change whenever the structure is rotated. Hard copy is scaled the same way and what you see is essentially what you get. Note that the Rescale factor (below) is now applied - this has the effect of reducing or enlarging the size of the viewing area as used for determining the scaling.

----Universal maximum. In this mode, the structure is scaled so that its maximum dimension is just smaller than the minimum dimension of the plotting areas; thus, rotations can be made without changing the scale and without going out of bounds. Again, hard copy is scaled the same way and what you see is essentially what you get. Note that the Rescale factor (below) is now applied - this has the effect of reducing or enlarging the size of the viewing area as used for determining the scaling.

----Fixed scale factors. This suboption allows you to set the scale to a fixed number of inches or centimeters per Angstrom for the dot-matrix and/or pen plot, or simply to reduce or enlarge the image from the automatic scaling modes.

Rescale factor. This factor is always applied in the Maximize size for each view and Universal maximum modes. When you "zoom" or rescale with the scaling buttons in the Dialog Bar - Right, this changes the rescale factor (rather than changing to the Fixed scale mode, as in pre-V4.2 ATOMS).

Scaling for the screen and normal printer output (Print command in the File menu) depends on the resolutions (dots per inch or centimeter), which are obtained from the software drivers for these devices. Resolution for the printer may often be reset in the Page Setup dialog in the File menu. The resolution for the Pen Plotter is set in the Pen Plotter Settings dialog, and that for a direct PostScript printer is set in the Postscript Settings in the Settings menu.

The Dialog Bar - Right allows "zooming" or incremental adjustment of the scale factors in the Fixed mode, or the Rescale factor in the other modes.