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Chapter II-12 — Graphs

II-252

Stroke Color

In the Markers or Lines and Markers modes you can specify a color

for marker objects that is different from the fill color for the mark-

ers. To use this select the Stroke Color checkbox and select a color

from the adjacent pop-up menu.

Text Markers

In addition to the built-in drawn markers, you can also instruct Igor to use one of the following as text markers:

• A single character from a font

• The contents of a text wave

• The contents of a numeric wave

A single character from a font is mainly of interest if you want to use a special symbol that is available in a

font but is not included among Igor’s built-in markers. The specified character is used for all data points.

The remaining options provide a way to display a third value in an XY plot. For example, a plot of earthquake

magnitude versus date could also show the location of the earthquake using a text wave to supply text mark-

ers. Or, a plot of earthquake location versus date could also show the magnitude using a numeric wave to

supply text markers. For each data point in the XY plot, the corresponding point of the text or numeric wave

supplies the text for the marker. The marker wave must have the same number of points as the X and Y waves.

To create a text marker, choose the Markers or Lines and Markers display mode. Then click the Markers

pop-up menu and choose the Text button.

This leads to a subdialog in which you can specify the source of the text as well as the font, style, rotation

and other properties of the markers.

You can offset and rotate all the text markers by the same amount but you can not set the offset and rotation

for individual data points — use tags for that. You may find it necessary to experimentally adjust the X and Y

offsets to get character markers exactly centered on the data points. For example, to center the text just above

each data point, choose Middle bottom from the Anchor pop-up menu and set the Y offset to 5-10 points. If

you need to offset some items differently from others, you will have to use tags (see Tags on page III-57).

Determines the reference point on the

rectangle enclosing the text. Igor places

this reference point at the coordinates of

the data point, plus the X and Y offset.

These pop-up menus show only waves

with the same number of points as the

main XY waves.

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Axis 282 Bedienungsanleitung Seite 20