
Chapter II-12 — Graphs
II-257
Color
You can choose a color for the selected trace from the Color pop-up
palette of colors.
If you don’t see a color you like, drag to the Other button and release.
You can then choose a color from the standard color picker dialog.
For more about the color pop-up palette, see The Color Environment on
page III-412.
Setting Trace Properties from an Auxiliary (Z) Wave
You can set the color of a trace on a point-by-point basis as a function of the values in an auxiliary wave.
You can also have the size of markers be a function of an auxiliary wave and you can set the marker number
directly from an auxiliary wave. The auxiliary wave is called the “Z wave” because other waves control the
X and Y position of a particular point on a trace while the Z wave controls a third property.
Setting the color or the marker size as a function of the values in an auxiliary wave can show three-dimen-
sional data (X,Y, and Z) on a two-dimensional plot. For example, you could position markers at the location
of earthquakes and vary their size to show the magnitude of each quake. You could show the depth of the
quake using marker color and show different types of quakes as different marker shapes.
If you click the “Set as f(z)” button, you will see the following dialog:
Color as f(z) has three modes: Color Table mode, Color Index Wave mode, and Three-column Color Wave
mode. These are selected in from the Color Mode menu.
If you select “Color as f(z)” and Color Table mode, the color of data points on the trace will be derived from
the Z wave you choose by linearly mapping its values into a built-in color table.
If you select 'Color as f(z)' and Color Table mode, the color of data points on the trace is derived from the Z
wave you choose by mapping its values into a built-in color table either linearly or logarithmically if the
Log Colors checkbox is checked.
The Z Wave pop-up browser lists all waves that are
the same length or greater than the trace to be
colored. It also shows multicolumn waves. For a
longer f(z) wave, or a multicolumn wave, the Subrange
button becomes available so that you can select a
specific point range or column from the wave.
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