You could draw all the static stuff into a buffer bitmap once, then in
OnPaint blit that to another bitmap, draw you non-static text, then blit
that to the Graphics object. I've done this a lot and performance is pretty
good. The other option is to repaint and invalidate just sections of your
image.
--
Chris Tacke, eMVP
Co-Founder and Advisory Board Member
www.OpenNETCF.org
---
Windows CE Product Manager
Applied Data Systems
www.applieddata.net
"Andrew Roxburgh" <(E-Mail Removed)> wrote in message
news:790B3E06-6A70-467F-A14D-(E-Mail Removed)...
> Thanks for the code John - that's really helped for the static text.
>
> However I could vastly improve things if I could draw the text without
having to refresh the whole form every time - I'm updating around (on
average) 10 times a second so if I repaint the whole form it flickers and is
quite slow.
>
> Anyone know a way to just refresh individual pieces of text?
>
> Thanks
>
> Andy
>
>
> ----- John Kirk wrote: -----
>
> If you're after a code snippet, this is what I use to put text on a
picture box. I use a picture box so I can put a bitmap in the background.
> After you've updated the text variable(s) just refresh the control.
Not sure how fast this is but as you can see it's not much more complex than
your old BBC Basic.
>
>
> Private mstrMessage as String
>
> Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As
System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
> If mstrMessage <> "" Then
> Dim f As Font
> Dim b As Brush
> Dim r As RectangleF
>
> r = New RectangleF(5, 5, 200, 20)
> f = New Font("Arial", 10, FontStyle.Bold)
> b = New SolidBrush(Color.White)
> e.Graphics.DrawString(mstrMessage, f, b, r)
> End If
> End Sub
>
>
> "Chris Tacke, eMVP" <(E-Mail Removed)> wrote in message
news:%(E-Mail Removed)...
> > Sure, override OnPaint for the Form and just paint the text where
you want
> > it.
> >> -Chris
> >>> "Andrew Roxburgh" <(E-Mail Removed)> wrote in
message
> > news:bacd01c3b947$afdf2800$(E-Mail Removed)...
> >> Hi,
> >>>> I have an monitoring application that displays various
> >> pieces of data, which are changing, within a form. The
> >> data is displayed in different colours (i.e. they are not
> >> all the same colour), and the various items are shown in
> >> different positions on the form. It's a status panel
> >> basically.
> >>>> I'm using labels to represent each data item.
> >>>> I don't want to use labels because:
> >> (1) I'm using the .Net Compact Framework which only allows
> >> around 100 controls before bombing out. I have multiple
> >> panels showing quite a few labels.
> >> (2) more importantly, it takes too long to draw on the
> >> screen. This is a real-time monitoring application. With
> >> data conversions, it takes around 300ms to draw about 20
> >> floating-point data values on the screen (I'm using WinCE
> >> on a Hitachi SH4 processor).
> >>>> So is there another method? Harking back to heady BBC
> >> BASIC days of the 1980s, this complex task was achievable
> >> with the PRINTAT(x,y) statement! I need to display text at
> >> specific positions on the form, without updating all the
> >> data simultaneously, and I need to be able to display in
> >> different colours. It should also paint quicker than a
> >> label control.
> >>>> Anyone got any ideas?
> >>>> Thanks
> >>>> Andy
> >>>>
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