| Re: circles and squares [message #20646] |
Mon, 17 July 2000 00:00 |
Liam E. Gumley
Messages: 378
Registered: January 2000
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Senior Member |
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Kenneth Mankoff wrote:
> i am having trouble making circular globes in IDL. Here is some sample
> code for X:
>
> window, xsize=500, ysize=500 ; should be square, pixels are...
> map_set, 0, 0, /ortho, /horiz, /grid ; produces a rectangle and oval
>
> ;;;in ps:
> set_plot, 'ps'
> device, xsize=10, ysize=10 ; should be a 10x10 cm square image
> map_set, 0, 0, /ortho, /horiz, /grid ; produces a 10x10.5 grid
>
> any suggestions or ideas as to why the above code produces rectangles with
> ovals inside rather than squares containing circles?
Try adding the ISOTROPIC keyword to the MAP_SET call:
map_set, 0, 0, /isotropic, /ortho, /horiz, /grid, /cont
Alternatively, use the SCALE keyword to define your map projection:
map_set, 0, 0, scale=75e6, /ortho, /horiz, /grid, /cont
This way the map scale stays the same regardless of the display size or
aspect ratio.
Cheers,
Liam.
http://cimss.ssec.wisc/~gumley
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