/**
* Called by a {@link MotionImitator} (or another {@link
* android.view.View.OnTouchListener}) when a {@link android.view.MotionEvent} occurs.
*
* @param offset
* the value offset
* @param value
* the current value
* @param delta
* the change in the value
* @param event
* the motion event
*/
protected virtual void Imitate(float offset, float value, float delta, MotionEvent ev)
{
if (ev != null)
{
switch (ev.Action)
{
case MotionEventActions.Down:
Constrain(ev);
break;
case MotionEventActions.Move:
if (ev.HistorySize > 0)
{
Mime(offset, value, delta,
ev.EventTime - ev.GetHistoricalEventTime(0), ev);
}
else
{
Mime(offset, value, delta, 0, ev);
}
break;
default:
case MotionEventActions.Up:
Release(ev);
break;
}
}
}
private void TouchesMoved(MotionEvent e, bool update = true)
{
// something may have happened (clear) so start the stroke again
if (currentPath == null)
{
TouchesBegan(e);
}
var hasMoved = false;
for (var i = 0; i < e.HistorySize; i++)
{
float historicalX = e.GetHistoricalX(i);
float historicalY = e.GetHistoricalY(i);
if (HasMovedFarEnough(currentPath, historicalX, historicalY))
{
// update the dirty rectangle
UpdateBounds(historicalX, historicalY);
hasMoved = true;
// add it to the current path
currentPath.Path.LineTo(historicalX, historicalY);
}
currentPath.GetPoints().Add(new InkPoint(
new System.Drawing.PointF(historicalX, historicalY),
e.GetHistoricalPressure(i),
null,
TimeSpan.FromMilliseconds(e.GetHistoricalEventTime(i))));
}
float touchX = e.GetX();
float touchY = e.GetY();
if (HasMovedFarEnough(currentPath, touchX, touchY))
{
// add it to the current path
currentPath.Path.LineTo(touchX, touchY);
// update the dirty rectangle
UpdateBounds(touchX, touchY);
hasMoved = true;
}
currentPath.GetPoints().Add(new InkPoint(
new System.Drawing.PointF(touchX, touchY),
e.Pressure,
null,
TimeSpan.FromMilliseconds(e.EventTime)));
if (update && hasMoved)
{
Invalidate(DirtyRect);
}
}