Drawing on a graph in Igor Pro

The draw layers sit above or below the data and take plain coordinates.

Function MarkThreshold(Variable level)
    SetDrawLayer/K UserFront

    SetDrawEnv xcoord=prel, ycoord=left, dash=3, linefgc=(0, 0, 65535)
    DrawLine 0, level, 1, level

    SetDrawEnv xcoord=prel, ycoord=prel, textrgb=(0, 0, 65535)
    DrawText 0.02, 0.08, "threshold " + num2str(level)
End

How it works

1. SetDrawLayer picks the layer; UserFront is above the traces.
2. SetDrawEnv sets the state for the next object only.
3. xcoord=prel means a fraction of the plot area rather than data units.

Keywords and builtins used here

• DrawLine
• DrawText
• End
• Function
• SetDrawEnv
• SetDrawLayer
• Variable
• num2str

The run, in numbers

Lines

9

Characters to type

274

Tokens

69

Three-star pace

85 tpm

At the three-star pace of 85 tokens a minute, this run takes about 49 seconds.

Type this snippet

Step 2 of 4 in Marking it up, step 13 of 19 in Graphs & presentation.

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