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Re: draw lines with XOR operation to background [message #6773]

Wed, 14 August 1996 00:00

thompson
Messages: 584
Registered: August 1991

Senior Member

hammerl@ibm01s.RZ.Uni-Augsburg.DE (Claus Hammerl) writes:

> Hello there,

> I want to draw a line into an image and remove this line later.
> I think the
> best way to do so is to draw the line with an XOR exclusive or operation
> on the background . another xor operation would then restore the
> original image. Does anybody know id IDL can do such XOR operation?

Look at the source code for the routine box_cursor. The command

device, get_graphics = old, set_graphics = 6

enables XOR operation, and

device, set_graphics = old

returns to the previous state.

Bill Thompson

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		Re: draw lines with XOR operation to background By: thompson on Wed, 14 August 1996 00:00
		Re: draw lines with XOR operation to background By: Robert Moss on Wed, 14 August 1996 00:00

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