private Point TabletToScreen(IPenData penData)
{
// Screen means LCD screen of the tablet.
return
(Point.Round(new PointF((float)penData.x * _capability.screenWidth / _capability.tabletMaxX,
(float)penData.y * _capability.screenHeight / _capability.tabletMaxY)));
}
private void OnPenData(IPenData penData) // Process incoming pen data
{
var pt = TabletToScreen(penData);
var btn = 0; // will be +ve if the pen is over a button.
{
for (var i = 0; i < _buttons.Length; ++i)
{
if (_buttons[i].Bounds.Contains(pt))
{
btn = i + 1;
break;
}
}
}
var isDown = penData.sw != 0;
// This code uses a model of four states the pen can be in:
// down or up, and whether this is the first sample of that state.
if (isDown)
{
if (_isDown == 0)
{
if (btn > 0)
{
_isDown = btn;
}
else
{
_isDown = -1;
}
}
// The pen is down, store it for use later.
if (_isDown == -1)
{
_penData.Add(penData);
}
}
else
{
if (_isDown != 0)
{
// transition to up
if (btn > 0)
{
if (btn == _isDown)
{
_buttons[btn - 1].PerformClick();
}
}
_isDown = 0;
}
// Add up data once we have collected some down data.
if (_penData.Count != 0)
{
_penData.Add(penData);
}
}
}
