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Chapter II-12 — Graphs

II-253

Igor determines the font size to use for text markers from the marker size, which you set in the Modify Trace

Appearance dialog. The font size used is 3 times the marker size.

You may want to show a text marker and a regular drawn marker. For this, you will need to display the

wave twice in the graph. After creating the graph and setting the trace to use a drawn marker, use Append

Traces to Graph (Graph menu) to append a second copy of the wave. Set this copy to use text markers.

Arrow Markers

Arrow markers can be used to create vector plots illustrating flow and gradient fields, for example. Arrow

markers are fairly special purpose and require quite a bit of advance preparation.

Here is a very simple example:

// 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 an arrow data wave to control the length and angle for each point.

Make/O/N=(3,2) arrowData // Controls arrow length and angle

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

// Put some data in arrowData

arrowData[0][0]= {20,25,30} // Col 0: arrow lengths in points

arrowData[0][1]= {0.523599,0.785398,1.0472} // Col 1: arrow angle in radians

// Set trace to arrow mode to turn arrows on

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

// Make an RGB color wave

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

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

// Store some colors in the color wave

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

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

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

// Turn on color as f(z) mode

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

To see a demo of arrow markers choose File

→Example Experiments→Graphing Techniques→Arrow Plot.

See the reference for a description of the arrowMarker keyword under the ModifyGraph (traces) operation on

page V-411 for further details.

Line Styles and Sizes

If you choose the “Lines between points”, “Lines and markers”, or Cityscape mode you also get to choose

the line style. You can change the dash patterns using the Dashed Lines item in the Misc main menu.

For any mode except the Markers mode you can set the line size. The line size is in points and can be frac-

tional. If the line size is zero, the line disappears.

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Axis 282 Manuale Utente Pagina 21