Graphical Component Question

[Guest_imported]

Hi

I have created a graphical component using the Canvas.Rectangle and Canvas.FillRect methods, but when the component is painted, I get constant flicker. Any ideas on how to remove the flicker ?

Thanks

 

[footpad]

SolStic_Sa,

There are several ways to handle this, but the most common is to create a temporary bitmap where you direct your Rectangle and FillRect calls to and then use BitBlt or StretchBlt to assign the final results to the actual canvas.

There are several articles on the Net that discuss the technique. Here are a few:

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http://www.undu.com/Articles/011126a.html

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http://www.delphipages.com/news/detaildocs.cfm?ID=39

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http://delphi.about.com/library/weekly/aa082801a.htm

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http://www.alistairkeys.co.uk/gdipart3.htm

(part 3 of 4, this actually appears to be the most in-depth article.)

Hope this helps...

-- Lance