OnPaint vs. using a cached background image

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  • PJ6
    #1

    OnPaint vs. using a cached background image

    I thought this was going to be a no-brainer. Instead of constantly
    re-rending with OnPaint, my plotter was going to render its entire image
    once to a bitmap OnResize as a way of caching its display. Only...
    displaying a cahced bitmap performs *signifigantly* worse than using
    OnPaint, especially when I'm zoomed in and scrolling around, and the bitmap
    is quite large. I was *not* expecting that.

    I know there has to be a right way of doing this. Is there anything I can do
    to squeeze greater performance out of picture rendering?

    Man I hope I get an answer to this one. This will be the fourth question
    I've asked here that nobody has answered :(

    Paul


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    • Peter Proost
      #2
      Re: OnPaint vs. using a cached background image

      Hi PJ6

      if you don't get an answer here maybe you could post to:
      microsoft.publi c.dotnet.framew ork.drawing
      which is the ng for drawing in .net
      And maybe if you post some code for this question that some people here can
      help you.

      Greetz Peter

      --
      Programming today is a race between software engineers striving to build
      bigger and better idiot-proof programs, and the Universe trying to produce
      bigger and better idiots. So far, the Universe is winning. (Rich Cook)

      "PJ6" <nobody@nowhere .net> schreef in bericht
      news:eM54x4JaGH A.3740@TK2MSFTN GP03.phx.gbl...[color=blue]
      > I thought this was going to be a no-brainer. Instead of constantly
      > re-rending with OnPaint, my plotter was going to render its entire image
      > once to a bitmap OnResize as a way of caching its display. Only...
      > displaying a cahced bitmap performs *signifigantly* worse than using
      > OnPaint, especially when I'm zoomed in and scrolling around, and the[/color]
      bitmap[color=blue]
      > is quite large. I was *not* expecting that.
      >
      > I know there has to be a right way of doing this. Is there anything I can[/color]
      do[color=blue]
      > to squeeze greater performance out of picture rendering?
      >
      > Man I hope I get an answer to this one. This will be the fourth question
      > I've asked here that nobody has answered :(
      >
      > Paul
      >
      >[/color]


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