I want to write a simple doodling program just for the stylus to draw
something
I modified the MainFormHandleEvent of the simple Hello Palm and added some
global variables as shown below.
But I found that it doesn't work and it shows nothing when I draw using
stylus.
Any problem with this program ?
// Global variables
RectangleType gDrawRect;
Int16 gX, gY;
Boolean gPenDown;
static Boolean MainFormHandleEvent(EventType * eventP)
{
Boolean handled = false;
FormType * frmP;
switch (eventP->eType)
{
case menuEvent:
return MainFormDoCommand(eventP->data.menu.itemID);
case frmOpenEvent:
frmP = FrmGetActiveForm();
MainFormInit(frmP);
FrmDrawForm(frmP);
handled = true;
break;
case frmUpdateEvent:
break;
case penDownEvent:
if (RctPtInRectangle(eventP->screenX,
eventP->screenY, &gDrawRect))
{
gX = eventP->screenX;
gY = eventP->screenY;
gPenDown = true;
handled = true;
}
break;
case penMoveEvent:
if (RctPtInRectangle(eventP->screenX,
eventP->screenY, &gDrawRect) && gPenDown)
{
Int16 newX = eventP->screenX;
Int16 newY = eventP->screenY;
WinDrawLine(gX, gY, newX, newY);
gX = newX;
gY = newY;
handled = true;
}
break;
case penUpEvent:
if (RctPtInRectangle(eventP->screenX,
eventP->screenY, &gDrawRect) && gPenDown)
{
Int16 newX = eventP->screenX;
Int16 newY = eventP->screenY;
WinDrawLine(gX, gY, newX, newY);
gX = gDrawRect.topLeft.x;
gY = gDrawRect.topLeft.y;
gPenDown = false;
handled = true;
}
break;
default:
break;
} // end of switch
return handled;
}
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