Axis 282 Uživatelský manuál stáhnout pdf (Strana 69)

Chapter II-12 — Graphs

II-301

Wind Barb Plots

You can create a wind barb plot by creating an XY plot and telling Igor to use wind barbs for markers. You

turn markers into wind barbs using "ModifyGraph arrowMarker", passing to it a wave that specifies the

length, angle and number of barbs for each point.

If you want to color-code the wind barbs, you turn on color as f(z) mode using "ModifyGraph zColor",

passing to it a wave that specifies the color for each point.

Here is an example. Execute the commands one section at at time to see how it works.

// Make XY data

Make/O xData = {1, 2, 3}, yData = {1, 2, 3}

Display yData vs xData // Make graph

ModifyGraph mode(yData) = 3 // Marker mode

// Make a barb data wave to control the length, angle

// and number of barbs for each point.

// To control the number of barbs, column 2 must have a column label of WindBarb.

Make/O/N=(3,3) barbData // Controls barb length, angle and number of barbs

SetDimLabel 1, 2, WindBarb, barbData // Set column label to WindBarb

Edit /W=(439,47,820,240) barbData

// Put some data in barbData

barbData[0][0]= {20,25,30} // Column 0: Barb lengths in points

barbData[0][1]= {0.523599,0.785398,1.0472} // Column 1: Barb angle in radians

barbData[0][2]= {10,20,30} // Column 2: Wind speed code from 0 to 40

// Set trace to arrow mode to turn barbs on

ModifyGraph arrowMarker(yData) = {barbData, 1, 10, 1, 1}

// Make an RGB color wave

Make/O/N=(3,3) barbColor

Edit /W=(440,272,820,439) barbColor

// Store some colors in the color wave

barbColor[0][0]= {65535,0,0} // Red

barbColor[0][1]= {0,65535,0} // Green

barbColor[0][2]= {0,0,65535} // Blue

// Turn on color as f(z) mode

ModifyGraph zColor(yData)={barbColor,*,*,directRGB,0}

To see a demo of wind barbs choose File

→Example Experiments→Feature Demos2→Barbs and Arrows.

See the arrowMarker keyword under ModifyGraph (traces) on page V-411 for details on the construction

of the barb data wave.

The various color as f(z) modes are explained under Setting Trace Properties from an Auxiliary (Z) Wave

on page II-257. You can eliminate the barbColor wave by using a color table lookup instead of a color wave.

Creating Split Axes

You can create split axes using the same techniques just described for creating stacked plots. Simply plot

your data twice using different axes and then adjust the axes so they are stacked. You can then adjust the

range of the axes independently. You can use draw tools to add cut marks.

WaveMetrics supplies a macro package to automate all aspects of creating split axes except setting the range

and adjusting the ticking details of the axes. To use the macro package, select the Graph→Packages→Split

Axes menu item. An example experiment using these macros is provided in the Examples folder.

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