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);
}
}
bool OnTouchOrHoverEvent(MotionEvent e, bool isTouch)
{
MotionEventButtonState buttonState = e.ButtonState;
MotionEventButtonState pressedButtons = buttonState & ~mOldButtonState;
mOldButtonState = buttonState;
if ((pressedButtons & MotionEventButtonState.Secondary) != 0)
{
// Advance color when the right mouse button or first stylus button
// is pressed.
AdvanceColor();
}
PaintMode mode;
if ((buttonState & MotionEventButtonState.Tertiary) != 0)
{
// Splat paint when the middle mouse button or second stylus button is pressed.
mode = PaintMode.Splat;
}
else if (isTouch || (buttonState & MotionEventButtonState.Primary) != 0)
{
// Draw paint when touching or if the primary button is pressed.
mode = PaintMode.Draw;
}
else
{
// Otherwise, do not paint anything.
return(false);
}
MotionEventActions action = e.ActionMasked;
if (action == MotionEventActions.Down || action == MotionEventActions.Move ||
action == MotionEventActions.HoverMove)
{
int N = e.HistorySize;
int P = e.PointerCount;
for (int i = 0; i < N; i++)
{
for (int j = 0; j < P; j++)
{
Paint(GetPaintModeForTool(e.GetToolType(j), mode),
e.GetHistoricalX(j, i),
e.GetHistoricalY(j, i),
e.GetHistoricalPressure(j, i),
e.GetHistoricalTouchMajor(j, i),
e.GetHistoricalTouchMinor(j, i),
e.GetHistoricalOrientation(j, i),
e.GetHistoricalAxisValue(Axis.Distance, j, i),
e.GetHistoricalAxisValue(Axis.Tilt, j, i));
}
}
for (int j = 0; j < P; j++)
{
Paint(GetPaintModeForTool(e.GetToolType(j), mode),
e.GetX(j),
e.GetY(j),
e.GetPressure(j),
e.GetTouchMajor(j),
e.GetTouchMinor(j),
e.GetOrientation(j),
e.GetAxisValue(Axis.Distance, j),
e.GetAxisValue(Axis.Tilt, j));
}
mCurX = e.GetX();
mCurY = e.GetY();
}
return(true);
}