The GUI OPTIONS Command

The OPTIONS menu allows the style of the displayed false colour image to be altered. The sub-menu is shown in Figure 15.

Figure 15: The Graphics Display Style Options Menu

The following command are available:

EXIT: Exit OPTIONS menu

?: Explanation on each of the menu options

COLOURS: Choice of different colour tables e.g. grey scale, inverse grey scale (black is more intense), ``temperature''. Several of the different colour tables are shown throughout this manual.

CURVE STYLES: Allows the style of curves to be altered. Each set of data coordinates may be displayed by a line through the coordinates, markers drawn at the coordinates, and error boxes drawn around the coordinates. (Error boxes will only be drawn if error estimates are defined.) All aspects of the lines and markers may be set. e.g. line type (solid, dotted, dashed, dot-dashed), line widths, colours, and marker types (15 choices). If the markers define closed shapes, the interiors may be optionally filled with a different colour.

GRID: Add or remove horizontal and vertical grid lines to the image display. Both coarse (every large axis tick mark) and fine (every small axis tick mark) grid lines may be set.

POSITION: Change the position for the image display in the graphics window. This allows you to change the size of the image display, or other graphics, within the graphics window. You click on opposite corners of the position where the image should be displayed. The coordinates input are those of the maximum region used for the axes frame of the image, contour plot or graph. Since the title and axis label positions are 'attached' to the axes frame this also changes their position. Note: This is a maximum size, if correct aspect ratio display is being used (the default) the actual region may be smaller if the image aspect ratio is not the same as the region.

ROTATE LUT: Change cyclically the colours used to display different intensity levels. This can emphasise different features in the data.

TITLE: Change the title of the image.

X-AXIS LABEL: Change the text used to label the X-axis of the image.

Y-AXIS LABEL: Change the text used to label the Y-axis of the image.

Z-AXIS LABEL: Change the text used to label the intensity scale (Z-scale) of the image. This is drawn with the look-up table intensity scale

Z-SCALING: Change the mapping of data values to pixel colours (see Section 5.3 for further details).

ASPECT RATIO: Change the ``aspect ratio'' for image display. By default pixels are drawn square, so if the ROI is rectangular the image is rectangular. When many more pixels are defined in one direction than the other, it can be more useful to allow the pixels to be rectangular and allow the image to fill the full region available. These modes can be toggled.

NO LUT: Don't draw the intensity scale colour bar, or ``look-up table''. When clicked, this is replaced by the button DRAW LUT.

The CURVE STYLES command allows the output style of 1-D data-sets to be controlled. A data-set may be drawn with a series of lines through the coordinates, a series of markers, and if error estimates are defined as a series of error boxes. The CURVES OUTPUT STYLES CONTROL FORM, shown in Figure 16, Page , allows the output styles to be set for individual curves. (Up to 15 different curve styles may be set, although generally in FIT2D only 1 or 2 1-D data-sets are output at a time.)

Figure 16: The Curves Output Styles Control Form

If lines are to be output the LINE OUTPUT STYLE CONTROL FORM appears. This is shown in Figure 17, Page . This allows the following attributes of the line to be set:

LINE TYPE: Type of line drawn between the coordinates:

1. Solid line
2. Dashed line
3. Dotted line
4. Dot-dash line

COLOUR: Colour of line: Choice of primary, and secondary colours, white, and black.

WIDTH: Scale factor for line thickness. (Graphics terminals are too low resolution to see the difference in thickness, except for very thick lines, but lines will appear thicker on PostScript hardcopy output.)

CLOSE: Whether a line should be drawn from the last data point to the first data point (usually not).

INTERPOLATION: Type of interpolation to use to draw the line between the data points:

• 0: Linear i.e. straight lines
• 1: Cubic spline i.e. smooth lines going through the data points, but with the maximum and minimum possibly going outside the range set by the two coordinates.
• 2: Piecewise monotonic i.e. smooth lines going through the data points, and with the maximum and minimum within the range set by the two coordinates.

Figure 17: The Line Output Style Control Form

If markers are to be output the MARKERS OUTPUT STYLE CONTROL FORM appears. This is shown in Figure 18, Page . This allows the following attributes of the markers to be set:

MARKER: Type of marker:

1. Dot ``.'' (Not scalable)
2. Cross ``+''
3. Asterisk ``*''
4. Circle ``o''
5. Diagonal cross ``X''
6. Square
7. Rotated square (Kite)
8. Triangle (Base a bottom)
9. Triangle (Point a bottom)
10. Six-pointed star
11. Convolution sign (circle with diagonal cross)
12. Circle with cross
13. Two coloured cross

COLOUR: Colour of lines used for drawing markers.

SIZE: Size scale factor.

WIDTH: Line width scale factor of lines used to draw markers.

FILLED: Whether or not the interior of markers which defined a closed area is to be filled with colour.

FILL COLOUR: The colour used to fill the interiors of any filled markers.

Figure 18: The Markers Output Style Control Form

If error boxes to be output the ERROR BOXES OUTPUT STYLE CONTROL FORM appears. This is shown in Figure 19, Page . This allows the following attributes of the error boxes to be set:

BOX TYPE Type of representation for the error estimates:

• 0: Cross hair
• 1: Kite
• Rectangle

Note: If the error estimates are only defined in one direction these are all drawn the same.

LINE TYPE Type of line used to drawn the error boxes:

1. Solid line
2. Dashed line
3. Dotted line
4. Dot-dash line

COLOUR: Colour of lines used for drawing the error boxes.

WIDTH: Line width scale factor of lines used to draw the error boxes.

Figure 19: The Error Boxes Output Style Control Form