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Date Posted: 16:10:49 01/29/01 Mon
Author: Bob Villiers
Subject: Re: Overlaid Cross
In reply to: Michel 's message, "Re: Overlaid Cross" on 07:48:59 01/29/01 Mon


Reading back my message, I am not sure what I meant either!

A few months ago i produced a demo which displayed a bitmap in a TPaintbox and marked a point on the bitmap with a cross.

I am now working on the production version, the bitmap file has become a png file and the image now exceeds the width of the display area. ie. it needs to be scrolled.

I can display the png file in a TImageScrollbox and write the cross to an added canvas in a mouse handler. However, if the image (plus cross) is scrolled so that the marked area is off screen the cross is erased. I have a "Cross Visible" flag and know the cross co ordinates, but I do not see an event which tells me the image should now be visible and therefore re drawn. (I suppose it ammounts to an OnScroll event and writing this has given me a clue how to solve it. <g> )


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