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Re: plotting a tropical cyclone symbol [message #94530 is a reply to message #94501]

Tue, 27 June 2017 08:10

Kenneth Bowman
Messages: 86
Registered: November 2006

Member

On Wednesday, June 14, 2017 at 1:23:43 PM UTC-5, Brian McNoldy wrote:

> Thanks for the suggestion, but I do not have or know of a TTF file with those characters/symbols. They are pretty hard to come by, but since NCL offers all of them, it would make sense that IDL would want to remain competitive.

You can draw an arbitrary filled or unfilled symbol using USERSYM and plot it with PLOTS.

We used it to create the outline of an airplane for animations of flight tracks (including rotating the direction of the plane).

This creates a filled or unfilled circular plotting symbol for when you need a finite-sized dot (as opposed to PSYM = 3).

Unfortunately you can only have on e USERSYM at at time, so you will have to redefine the symbol when switching between filled and unfilled.

Ken

PRO USERSYM_CIRCLE, FILL = fill, NPOINT = npoints

;+
; Name:
; USERSYM_CIRCLE
; Purpose:
; Define a circular plotting symbol using USERSYM.
; Calling sequence:
; USERSYM_CIRCLE
; Inputs:
; None
; Output:
; Changes definition of user-defined symbol (PSYM = 8).
; Keywords:
; FILL : If set, make the symbol filled
; Author and history:
; K. Bowman. 2006-07-11
;-

COMPILE_OPT IDL2 ;Set compile options

IF (N_ELEMENTS(npoints) EQ 0) THEN npoints = 17

USERSYM, 0.5*COS(2.0*!PI*FINDGEN(npoints)/npoints), $ ;Create circular plotting symbol
0.5*SIN(2.0*!PI*FINDGEN(npoints)/npoints), $
FILL = fill

END

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[Message index]

		plotting a tropical cyclone symbol By: Brian McNoldy on Wed, 14 June 2017 09:26
		Re: plotting a tropical cyclone symbol By: natha on Wed, 14 June 2017 10:51
		Re: plotting a tropical cyclone symbol By: Brian McNoldy on Wed, 14 June 2017 11:23
		Re: plotting a tropical cyclone symbol By: Kenneth Bowman on Tue, 27 June 2017 08:10
		Re: plotting a tropical cyclone symbol By: chris_torrence@NOSPAM on Mon, 03 July 2017 13:09

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