Slow 2d redrawing panel problem

[Macaco]

Hello,

I used this tutorial

http://www.codeproject.com/cs/media/showwaveform.asp

to draw a wavs waveform in a panel, the problem is that it draws the waveform really slow in the panel and each time I scroll the bar to see all the form it redraws it (if not I wouldnt see the waveform well) and it scrolls really slowly.

Is there any way to solve this ??? to make it go faster???

thanks for your help

 

[Macaco]

Maybe instead of drawing it to the panel, draw it to a image file and then load the image file into the panel??? is it possible?

 

[IngisKahn]

The fastest way to do it is to use a back buffer and only copy over invalidated regions.

 

[ThePentiumGuy]

Hmm,
Form1_Load:
me.setstyle(allpaintinginwmpaint,true)
me.setstyle(doublebuffer,true)
me.setstyle(userpaint,true)

Edit: You said panel right? Change "Me" to "Panel1".

 

[Macaco]

Panels doesnt have these properties

Hmm,
Form1_Load:
me.setstyle(allpaintinginwmpaint,true)
me.setstyle(doublebuffer,true)
me.setstyle(userpaint,true)

Edit: You said panel right? Change "Me" to "Panel1".

 

[ThePentiumGuy]

Yikes. Ummm, maybe try using a picturebox, or a label. or draw directly to the form.

-TPG

 

[Macaco]

Ok, thanks.

I solved it fastly by drawing less data samples to get more speed in the draw.