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This IDL Programming Tips and Tricks database is a. ANSWER: The Coyote Graphics System (CGS) is a collection of Coyote Library. QUESTION: How do I download and install the Coyote Library.

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This program draws an arrow on a graphics display. The output is generally passed to cgColor to obtain the actual color used in the program. PATH system variable so you can use it.

The advantage of this is that your Web output takes advantage of nice PostScript fonts. This program takes advantage of third-party free software Ghostscript, pstopdf, epstopdf, etc. But, of course, over time the library evolved into programs that became indispensible in my own IDL programming work.

Coyote IDL Program Libraries

The image location and the image value at that location is output in a status bar widget in newer versions of this program. Not all naming conflict problems are easily resolved. The default erase color is “white” to accommodate these graphics commands.

Moreover, a Traceback keyword will give me accurate traceback information if this is used in conjunction with a Catch error handler. This program gives me the ability to write one error message and have it work appropriately for the device it is running on. This command allows you to delete any or all cgWindow applications on the display. Users can rotate and zoom into and out of the surface with the mouse, change colors and other surface properties at will, and save the surface to a number of output file types, including PostScript.

Extracting the zip file will install a directory named coyote on your machine. A box and whisker plot in IDL. And the time stamp can be formatted in a way that is appropriate for use in an IDL variable name. The program is essentially a conduit to the SetProperty method of the underlying cgWindow object. Commands can be added, deleted, replaced, and listed.

If your directory structure looks like this: Its purpose is to demonstrate the best programming practices for creating direct graphics graphical output in IDL. One of the nicest coyotf of cgImage is the ability to use it with! For example, if you are running into a problem with a program like PSCONFIG, it is likely that you may have another program with this name on your path, and you are compiling this first, rather than the one you want in the coyote directory.


It can choose its color based on the background color of the graphics window. In other words, the GVF algorithm can be applied to a 2D dataset as a function, in the manner of other image processing functions. This is an IDL object library that David Burridge and I originally wrote in for a large satellite image application.

The character size depends on the operating system you are using, the current font value, and the state of the! Among the many features of the cgImage command are these: It’s purpose is to make character sizes large enough to be read easily and to make Coyote Graphics routines look more like the IDL 8 function graphics routines. This tells IDL to search all of the sub-directories of these directories and add them to the path, too.

This command is similar to the NASA Astronomy Library routine PartVelVecexcept that keywords make it much easier to create a vector magnitude key and there are additional features, such as the ability to draw vectors with solid arrowheads. The missing “color” can be specified as the name of a color, as a color index for 2D images or as a color triple.

A “layout” has a specified grid of columns and rows organized inside a graphics display window. A button is available that can “adjust” the Y range of the zoomed-in plot to completely show the values indicated by the X range of the zoomed-in plot.

Multiple cgWindow programs can be opened at once, and you have easy access to the commands in any graphics window.

In other words, before in such coyite you had to write code like this. It should not be relied upon, and it will not work in earlier versions of IDL. An output keyword, CurrentState, is availabe to return the current color decomposition state of the device at the time it is set. You can learn more about how this program works by reading the Discrete Color Bar article on my web page. This command can be used in programs that are meant to work on the display and in devices that do not support windows by “protecting” coyotf Window command from the latter devices.


This color bar appears exactly the same in a PostScript file as it does on your display. Note also that directories are separated by colons in a UNIX environment.

IDL Programming Tips

Here is an example of how to display a filled contour plot with a color bar. The purpose of this program is to return the normalized position coordinates for a line plot, contour plot, or image plot with a specific “layout” in the current graphics window. Your satisfaction, while not strictly guaranteed, is always carefully considered.

This program is a substitute program for Congrid, specifically for sizing 2D and true-color images, without the weaknesses of the Congrid command. Mark is an excellent IDL programmer and you foyote find excellent object graphics programs, elegant object classes, and means for acessing netCDF files, among lots of other programs in this excellent collection. These two programs in the same file are wrappers that allow easy configuration of PostScript output. The Subversion ild is highly recommended as this is the main repository for all the work I do on these Libraries.

Using this program to open windows is one way to ensure your PostScript output looks identical to your display output. These are programs from the Coyote Library that are specifically identified as being associated with the Coyote Graphics System.

The program is used like this: Creates a transparent image either from a supplied image or from an IDL graphics window. The purpose of this function is to find an optimal threshold for separating a bimodal distribution of pixels in an image histogram.

Input can be a scalar or an array of Julian numbers.