Very smooth scrolling label

[poltadi]

Greetings!

I am new with Delphi. And I can`t solve one problem for few weeks already. My goal is to make a Label scroll when I move mouse over it. There are many exapmles on the internet about scrolling labels (example:

http://www.tek-tips.com/viewthread.cfm?qid=54772),

but here`s the problem: how do I make it scroll smooth, so that eye couldn`t spot the flickering.

I appreciate any help.
Thanks!

 

[DjangMan]

You'll want to see if you can turn on DoubleBuffering. Look up that topic for more information or others who know more might be able to chime in.

 

[djjd47130]

I have been becoming very familiar with this subject lately, and have learned the best solution for avoiding flickering. Don't draw directly to the control's canvas. Create a bitmap in the background, do all your drawing on this bitmap, and as needed, just draw this bitmap to the control's canvas. That avoids any flickering.

JD Solutions

 

[poltadi]

I have drawed it like that - not directly on the canvas, instead on the bitmap in the background. But it`s still notable that the text is moving one pixel at a time. How do I make it slide smoothly?

 

[djjd47130]

At the moment I myself am dealing with similar issues, and I'm solving some of my problems by converting my calculations to use Single instead of Integer. It helps keep things working on a finer scale to avoid jumping around. Not sure if it may help in your case, but if you are able to post a sample of how you're drawing, it can be fixed much easier. Sometimes it could be something real simple, like clearing the canvas before drawing - if you don't clear the canvas first it won't flicker.

JD Solutions