directgraphics/
vis_read.pro
includes main-level programtop vis_read
result = vis_read( [xstart] [, ystart] [, nx] [, ny] [, channel] [, true=long] [, red=bytarr] [, green=bytarr] [, blue=bytarr] [, _extra=keywords])
Reads from the current graphics device (WIN, X, or Z devices) and returns the image in the TRUE format specified.
NOTE: on Mac OS X, the resize indicator in the lower right of the image is filled with a solid color using the pixel immediately to the left of the indicator at y=0.
Return value
image byte array
Parameters
- xstart in optional type=long default=0L
starting column to read
- ystart in optional type=long default=0L
starting row to read
- nx in optional type=long default=fill window from xstart
number of columns to read
- ny in optional type=long default=fill window from ystart
number of rows to read
- channel in optional type=long default=0L
the memory channel to read
Keywords
- true in optional type=long
TRUE format of output image desired; defaults to 0 on 8-bit hardware and 1 on higher bit-depths
- red out optional type=bytarr
red values for the color table produced if TRUE was set to 0 on a graphics device supporting 24-bit color
- green out optional type=bytarr
green values for the color table produced if TRUE was set to 0 on a graphics device supporting 24-bit color
- blue out optional type=bytarr
blue values for the color table produced if TRUE was set to 0 on a graphics device supporting 24-bit color
- _extra in optional type=keywords
keywords to TVRD
Examples
See the main-level program at the end of this file:
IDL> .run vis_read
File attributes
| Modification date: | Wed May 16 14:23:50 2012 |
| Lines: | 149 |
| Docformat: | rst rst |