Re: PenMove in OS5

[Tom Frauenhofer]

I had the same problem on my Tungsten C.  My fix was to write a "tighter" 
event loop on the penDownEvent to go until the penUpEvent was received 
(which you should do for good drawing routines to improve the drawing 
quality).  (Only thing I can think of is that the pen queue is somehow 
getting overrun with penMoveEvents courtesy a faster processor, I'm sure 
there's a better explanation lurking out there...)

Here's an (incomplete) event handler for a form which includes some code 
that should do what you need:

Boolean SomeFormEventHandler(EventType* eventP)
{
        EventType evt;
        Boolean done = false;
...

        case penDownEvent:
                // Initialize the drawing using data from the penDown event
                while(!done) {
                        EvtGetEvent(&evt, 1);
                        switch(evt.eType)
                        {
                                case penMoveEvent:
                                        // do some drawing work
                                        break;
                                case penUpEvent:
                                        done = true;
                                        break;
                                default:
                                        // Handle other events?
                                        break;
                        }
                }
                handled = true;
                break;
...

        return handled;
}
Remember that you might get other events (such as nilEvents) during the 
processing of this loop, so you have to handle them accordingly.

At 12:00 AM 6/21/2003 -0700, "Kelly Perkins" <[EMAIL PROTECTED]> wrote:
Has anyone encountered problems with the penMove event in OS5 on real
devices? We have an application that draws a line from pendown to penup but
also captures penMove. It works great in pre-OS5 and great on the OS5
simulator. However, on a real device, it is very choppy at best and doesn't
seem to capture all of the movements. This is in the normal drawing window,
nothing fancy like drawing over Graffiti or anything. Any ideas to fix it
would be appreciated! Thanks! Or, does anyone know how to get the source
code for Palm Notepad since that seems to work fine?
Here is a sample to try to see the problem - note it works fine in the
Simulator, so you have to try it on a real device:
  case penDownEvent:
   s_x = eventP->screenX;
   s_y = eventP->screenY;
   s_bPenDown = true;
   break;
  case penMoveEvent:
   if (s_bPenDown == true)
   {
    xNew = eventP->screenX;
    yNew = eventP->screenY;
    // draw a single line
    WinDrawLine(s_x, s_y, xNew, yNew);
    s_x = xNew;
    s_y = yNew;
   }
   break;
----
Tom Frauenhofer, [EMAIL PROTECTED]
http://www.beret.com 



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