private void OnTouch(object sender, SKTouchEventArgs e)
{
SKPoint absoluteTouchLocation = new SKPoint((int)Math.Floor(e.Location.X), (int)Math.Floor(e.Location.Y));
SKPoint aspectTouchLocation = anArtBoard.MatrixToAspectCoordinates().MapPoint(absoluteTouchLocation);
switch (e.ActionType)
{
case SKTouchAction.Pressed:
// the user added a finger
aBezierHandle = new BezierHandle(aspectTouchLocation);
bezierHandlePreviewCanvasView.InvalidateSurface();
break;
case SKTouchAction.Moved:
// the user moved a finger
if (e.InContact)
{
aBezierHandle.MouseControlPoint = aspectTouchLocation;
if (aBezierHandle.Magnitude <= bezierHandleThresholdSlider.Value)
{
aBezierHandle.MouseControlPoint = aBezierHandle.AnchorPoint;
}
}
bezierHandlePreviewCanvasView.InvalidateSurface();
break;
case SKTouchAction.Released:
// the user removed a finger
aBezierHandle.MouseControlPoint = aspectTouchLocation;
if (aBezierHandle.Magnitude <= bezierHandleThresholdSlider.Value)
{
aBezierHandle.MouseControlPoint = aBezierHandle.AnchorPoint;
}
bezierHandlePreviewCanvasView.InvalidateSurface();
break;
case SKTouchAction.Cancelled:
// the user removed a finger
aBezierHandle = null;
bezierHandlePreviewCanvasView.InvalidateSurface();
break;
}
// the location (in pixels) of the finger on the screen
//var pos = e.Location;
// set Handled to true if we handled the event
// if we don't, then parent views may also respond
e.Handled = true;
}
public void GenerateBezierPath(PathPreviewAlgorithms pathPreview)
{
BezierHandle prevBezierHandle = null;
bool firstMove = true;
foreach (var aBezierHandle in this.BezierHandleList)
{
if (prevBezierHandle == null)
{
prevBezierHandle = aBezierHandle;
continue;
}
if (firstMove)
{
this.InProgressPath.MoveTo(prevBezierHandle.AnchorPoint);
firstMove = false;
}
this.InProgressPath.CubicTo(
prevBezierHandle.MouseControlPoint,
aBezierHandle.TheOtherControlPoint,
aBezierHandle.AnchorPoint);
prevBezierHandle = aBezierHandle;
}
if (pathPreview == PathPreviewAlgorithms.LinearClose)
{
this.InProgressPath.Close();
}
else if (pathPreview == PathPreviewAlgorithms.Close)
{
this.InProgressPath.CubicTo(
this.BezierHandleList.Last().MouseControlPoint,
this.BezierHandleList.First().TheOtherControlPoint,
this.BezierHandleList.First().AnchorPoint);
this.InProgressPath.Close();
}
}
