// Touch move event handler.
/// <summary>
/// 在move过程判断具体的手势（zoom，pan,rotate）
/// </summary>
/// <param name="drawingCanvas"></param>
/// <param name="e"></param>
public void TouchMoveHandler(DrawingCanvas drawingCanvas, TouchEventArgs e)
{
GraphicsPolyLine polyLine;
if (_activeStrokes.TryGetValue(e.TouchDevice.Id, out polyLine))
{
TouchPoint touchPoint = e.GetTouchPoint(drawingCanvas);
Point p = touchPoint.Position;
polyLine.AddPoint(p);
if (e.TouchDevice.Id == GestureData.FirstDeviceId)
{
GestureData.FirstFingerCurPoint = p;
}
if (e.TouchDevice.Id == GestureData.SecondDeviceId)
{
GestureData.SecFingerCurPoint = p;
}
//polyLine.AddToCanvas(drawingCanvas);
//判断出具体手势，然后根据手势，在case中按照相应的比例绘画图像。
if (GestureData.IsGesture)
{
GestureId gestureId = HelperFunctions.getGestureId(drawingCanvas, e);
bool hasSelected = HelperFunctions.hasSelected(drawingCanvas);
System.Diagnostics.Debug.WriteLine("hasSelected:{0}", hasSelected);
switch (gestureId)
{
case GestureId.ZOOM:
if (hasSelected)
{
foreach (GraphicsBase b in drawingCanvas.GraphicsList)
{
if (b.IsOption)
{
b.Zoom(GestureData.ZoomScale, GestureData.StartCenterPointInTwoFingers);
}
}
}
else
{
foreach (GraphicsBase b in drawingCanvas.GraphicsList)
{
b.Zoom(GestureData.ZoomScale, GestureData.StartCenterPointInTwoFingers);
}
}
break;
case GestureId.PAN:
if (hasSelected)
{
foreach (GraphicsBase b in drawingCanvas.GraphicsList)
{
if (b.IsOption)
{
b.Move(GestureData.Panx, GestureData.Pany);
}
}
}
else
{
foreach (GraphicsBase b in drawingCanvas.GraphicsList)
{
b.Move(GestureData.Panx, GestureData.Pany);
}
}
break;
case GestureId.RORATE:
if (hasSelected)
{
foreach (GraphicsBase b in drawingCanvas.GraphicsList)
{
if (b.IsOption)
{
b.Rotate(GestureData.RotateAngle, GestureData.StartCenterPointInTwoFingers);
}
}
}
else
{
foreach (GraphicsBase b in drawingCanvas.GraphicsList)
{
b.Rotate(GestureData.RotateAngle, GestureData.StartCenterPointInTwoFingers);
}
}
break;
case GestureId.ERASE:
break;
default:
break;
}
}
}
System.Diagnostics.Debug.WriteLine("Touchmove");
}