Axis 282 Instrukcja Użytkownika Pobierz pdf (Strona 15)

Chapter II-12 — Graphs

II-247

Normally, X axes are plotted horizontally and Y axes vertically. You can reverse this behavior by selecting

the “Swap X & Y Axes” checkbox. This is commonly used when the independent variable is depth or height.

This method swaps X and Y for all traces in the graph. You can cause individual traces to be plotted verti-

cally by selecting the “Swap X & Y Axes” checkbox in the New Graph and Append Traces dialogs as you

are creating your graph.

Initially, the graph font is determined by the default font which you can set using the Default Font item in the

Misc menu. The graph font size is initially automatically calculated based on the size of the graph. You can over-

ride these initial settings using the “Graph font” and “Font size” settings. Igor uses the font and size you specify

in annotations and axis labels unless you explicitly set the font or size for an individual annotation or label.

Initially, the graph marker size is automatically calculated based on the size of the graph. You can override

this using the “Marker size” setting. You can set it to “auto” (or 0 which is equivalent) or to a number from

1 to 9. Igor uses the marker size you specify unless you explicitly set the marker size for an individual wave

in the graph.

The margin is the distance from an outside edge of the graph to the edge of the plot area of the graph. The plot

area, roughly speaking, is the area inside the axes. See Graph Dimensions on page II-247 for a definition. Ini-

tially, Igor automatically sets each margin to accommodate axis and tick mark labels and exterior textboxes,

if any. You can override the automatic setting of the margin using the Margins settings. You would do this,

for example, to force the left margins of two graphs to be identical so that they align properly when stacked

vertically in a page layout. The Units pop-up menu determines the units in which you enter the margin values.

You can also set graph margins interactively. If you press Option (Macintosh) or Alt (Windows) and position

the cursor over one of the four edges of the plot area rectangle, you will see the cursor change to this shape:

. Use this cursor to drag the margin. You can cause a margin to revert to automatic mode by dragging the

margin all the way to the edge of the graph window (or beyond). If you drag to within a few pixels of the edge,

the margin will be eliminated entirely (this requires good accuracy with the mouse). If you double click with

this cursor showing you will get the Modify Graph dialog with the corresponding margin setting selected.

If you specify a margin for a given axis, the value you specify solely determines where the axis appears.

Normally, dragging an axis will adjust its offset relative to the nominal automatic location. If, however, a

fixed margin has been specified then dragging the axis will drag the margin.

Graph Dimensions

The Modify Graph dialog provides several ways of controlling the width and height of a graph. Usually

you don’t need to use these. They are intended for certain specialized applications.

These techniques are powerful but can be confusing unless you understand the algorithms, described

below, that Igor uses to determine graph dimensions.

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Axis 282 Instrukcja Użytkownika Strona 15