Axis 282 Uživatelský manuál stáhnout pdf (Strana 66)

Chapter II-12 — Graphs

II-298

Function AddPlotFrame()

SetDrawLayer UserBack

SetDrawEnv xcoord=prel,ycoord=prel,fillpat=0

DrawPoly 0,0,1,1,{0,0,0,1,1,1,1,0,0,0}

SetDrawLayer UserFront

End

To use this function, include the WaveMetrics-supplied “AddPlotFrame” file. See Including a Procedure

File on page III-348 for instructions on including a procedure file.

In case you need to change its color or thickness, you should note that it is in the UserBack draw layer. That

is so the axes will be drawn on top of the frame. You might find that decreasing the thickness of the plot

frame to, say, 0.25 points will highlight the axes nicely.

Waterfall Plots

You can create a graph displaying a sequence of traces in a perspective view. We refer to these types of

graphs as waterfall plots, which can be created and modified using, respectively, the NewWaterfall oper-

ation on page V-456 and ModifyWaterfall operation on page V-435. At present, there is no dialog interface

that you can use to create waterfall plots, so you must either execute these commands on the Command

Line or in an Igor Procedure.

To display a waterfall plot, you must first create or load a matrix wave. (If your data is in 1D waveform or

XY pair format, you may find it easier to create a Fake Waterfall Plots as described on page Fake Waterfall

Plots on page II-300.) In this 2D matrix, each of the individual matrix columns is displayed as a separate

trace in the waterfall plot. Each column from the matrix wave is plotted in, and clipped by, a rectangle

defined by the X and Z axes with the plot rectangle displaced along the angled Y axis, which is the right-

hand axis, as a function of the Y value.

You can display only one matrix wave per plot.

The traces can be plotted evenly-spaced, in which case their X and Y positions are determined by the X and

Y dimension scaling of the matrix. Alternatively they can be plotted unevenly-spaced as determined by sep-

arate 1D X and Y waves.

To modify certain properties of a waterfall plot, you must use the ModifyWaterfall operation. For other

properties, you will need to use the usual axis and trace dialogs.

Because the traces in the waterfall plot are from a single wave, any changes to the appearance of the water-

fall plot using the Modify Trace Appearance dialog or ModifyGraph operation will globally affect all of the

waterfall traces. For example, if you change the color in the dialog, then all of the waterfall traces will

change to the same color. If you want each of the traces to have a different color, then you will need to use

a separate wave to specify (as f(z)) the colors of the traces. See the example in the next section for an illus-

tration of how this can be done.

The X and Z axes of a waterfall are always at the bottom and left while the Y axis runs at a default 45 degrees

on the right-hand side. The angle and length of the Y axis can be changed using ModifyWaterfall. Except

when hidden lines are active, the traces are drawn in back to front order. Note that hidden lines are active

only when the trace mode is lines between points.

Marquee expansion is based only on the bottom and right (waterfall) axes. The marquee is drawn as a box

with the bottom face in the ZY plane at zmin and the top face is drawn in the ZY plane at zmax.

Cursors may be used and the readout panel provides X, Y and Z axis information. The hcsr and xcsr functions

are unchanged; the vcsr function returns the Y data value (waterfall) and the zcsr returns the data (Z axis) value.

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