Slow 2d redrawing panel problem

[Macaco]

Hello,

 

I used this tutorial

 

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

 

to draw a wav's 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 wouldn't 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 doesn't 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.