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% @(#)zoom_over.hlq 19.1 (ESO-IPG) 02/25/03 14:03:52
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%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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%.COPYRIGHT (c) 1990 European Southern Observatory
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%.KEYWORDS MIDAS, help files, ZOOM/OVERLAY
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%.PURPOSE On-line help file for the command: ZOOM/OVERLAY
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%.VERSION 1.0 30-JUN-1991 : Creation, KB
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%----------------------------------------------------------------
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ZOOM/OVERLAY 30-JUN-1991 KB
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ZOOM/OVERLAY [zoom_fact] [center]
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zoom image + overlay together
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Zoom image interactively and also the overlay plane.
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ZOOM/OVERLAY [zoom_factor] [center]
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zoom_fact = integer zoom factor;
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if zoom_fact is omitted, zoom the image + overlay on image display
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according to size of rectangle formed by the two cursors (a);
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maximum of the zoom factors in x and y is taken, so that equal
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magnification in x and y is assured;
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if zoom factor is given, zoom the image + overlay with explicit
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zoom factor in interval [1,8] (b);
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if zoom_factor = UP or DOWN (c), zoom up or down continuously:
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Every time the ENTER button is pressed on the cursor box, the
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image + overlay is zoomed with the next higher (lower) zoom
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factor. Control returns to the terminal when highest (=8) or
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lowest (=1) zoom factors are reached, or if ENTER is pressed with
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center = only for option (b) above: x,y-screen coords. of center pixel
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if center is omitted, use cursor to choose center of zoom
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CLEAR/ZOOM, ZOOM/CHANNEL, CLEAR/OVERLAY
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On workstations with X-Windows the overlay channel/plane is
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emulated in software. Therefore ZOOM/OVERLAY is not supported
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on workstations in MIDAS.
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Modify size of cursor rectangle to determine the zoom factor and
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move it over part of image which should remain on display, press
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ENTER to magnify image + overlay.
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Move cursor to pixel which should remain fixed on display, press
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ENTER to magnify image + overlay by a factor of 4.