Axis 282 Uživatelský manuál stáhnout pdf (Strana 35)

Chapter II-12 — Graphs

II-267

The Offset item is a way to control the distance between the edge of the graph and the axis. It specifies the

distance from the default axis position to the actual axis position. This setting is in units of the size of a zero

character in a tick mark label. Because of this, the axis offset adjusts reasonably well when you change the

size of a graph window. The default axis offset is zero. You can restore the axis offset to zero by dragging

the axis to or beyond the edge of the graph. If you enter a graph margin (see Overall Graph Properties on

page II-246), the margin overrides the axis offset.

Normally you will adjust the axis offset by dragging the axis in the graph. If the mouse is over an axis, the

cursor changes to a double-ended arrow indicating that you can drag the axis. If the axis is a mirror axis

you will not be able to drag it and the cursor will not change to the double-ended arrow.

The Offset item does not affect a free axis. To adjust the position of a free axis, use the settings in the Free

Axis Position area in the lower-left corner of the Axis Tab (see page II-266).

The Thickness item sets the thickness of an axis and associated tick marks in points. The thickness can be

fractional and if you set it to zero the axis and ticks disappear.

The Standoff checkbox disables normal behavior with respect to offsetting axes. Normally Igor offsets axes

so that waves do not cover them. For example, imagine that your Y axis goes from -1 to 0 and your waves

have Y values equal to -1. These Y values would cover up the X axis if not for Igor’s normal axis offset. This

is especially noticeable when you use markers. If you don’t like your axes to stand off, you can disable the

standoff using the “Axis standoff” checkbox.

If a free axis is attached to the same edge of the plot rectangle as a normal axis then the standoff setting for

the normal axis will be ignored. This is to make it easy to create stacked plots.

The Offset item applies only to the four standard axes (Bottom, Left, Top and Right); it does not apply to

free axes. To change the position of free axes, use the controls in the Free axis position area:

The free position can be adjusted by dragging the axis interactively. This is the recommended way to adjust

the position when using the absolute distance mode but it is not recommended when using the “crossing

at” mode. This is because the crossing value as set interactively will not be exact. You should use this dialog

to specify an exact crossing value.

Colors of axis components are controlled by items in the Color area. The axis label, tick mark labels and the

axis line (including the tick marks) can be colored independently, but usually you will want them all to be

the same color. The Set All to Axis Color button is a convenient way to do this — just choose a color in the

Axis Line palette, then click the button. The color of text in the axis label can also be controlled by escape

codes in the axis label text. See Axis Labels on page II-282. Tick marks can be assigned a color that is differ-

ent than the axis line, but this is not supported by the dialog.

The Font section of the Axis tab specifies the font, font size, and typeface used for the tick labels and the axis

label. You should leave this setting at “default” unless you want this particular axis to use a font different from

-6 -4 -2

0 2 4 6

Standoff on

-6 -4 -2

0 2 4 6

Standoff off

Use pop-up menu to specify how the

axis is to be positioned.

Choose this to position axis at a

particular numeric value on an axis.

Pop-up menu of all axes that are

perpendicular to the current axis.

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