// 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");
}
/// <summary>
/// Handle mouse down.
/// Start moving, resizing or group selection.
/// </summary>
public override void OnMouseDown(DrawingCanvas drawingCanvas, MouseButtonEventArgs e)
{
commandChangeState = null;
wasMove = false;
Point point = e.GetPosition(drawingCanvas);
selectMode = SelectionMode.None;
GraphicsBase o;
GraphicsBase movedObject = null;
int handleNumber;
// Test for resizing (only if control is selected, cursor is on the handle)
for (int i = drawingCanvas.GraphicsList.Count - 1; i >= 0; i--)
{
o = drawingCanvas[i];
if (o.IsSelected)
{
handleNumber = o.MakeHitTest(point);
if (handleNumber > 0)
{
selectMode = SelectionMode.Size;
// keep resized object in class member
resizedObject = o;
resizedObjectHandle = handleNumber;
// Since we want to resize only one object, unselect all other objects
HelperFunctions.UnselectAll(drawingCanvas);
o.IsSelected = true;
commandChangeState = new CommandChangeState(drawingCanvas);
break;
}
}
}
// Test for move (cursor is on the object)
if (selectMode == SelectionMode.None)
{
for (int i = drawingCanvas.GraphicsList.Count - 1; i >= 0; i--)
{
o = drawingCanvas[i];
if (o.MakeHitTest(point) == 0)
{
movedObject = o;
break;
}
}
if (movedObject != null)
{
selectMode = SelectionMode.Move;
// Unselect all if Ctrl is not pressed and clicked object is not selected yet
if (Keyboard.Modifiers != ModifierKeys.Control && !movedObject.IsSelected)
{
HelperFunctions.UnselectAll(drawingCanvas);
}
// Select clicked object
movedObject.IsSelected = true;
// Set move cursor
drawingCanvas.Cursor = Cursors.SizeAll;
commandChangeState = new CommandChangeState(drawingCanvas);
}
}
// Click on background
if (selectMode == SelectionMode.None)
{
// Unselect all if Ctrl is not pressed
if (Keyboard.Modifiers != ModifierKeys.Control)
{
HelperFunctions.UnselectAll(drawingCanvas);
}
// Group selection. Create selection rectangle.
GraphicsSelectionRectangle r = new GraphicsSelectionRectangle(
point.X, point.Y,
point.X + 1, point.Y + 1,
drawingCanvas.ActualScale);
r.Clip = new RectangleGeometry(new Rect(0, 0, drawingCanvas.ActualWidth, drawingCanvas.ActualHeight));
drawingCanvas.GraphicsList.Add(r);
selectMode = SelectionMode.GroupSelection;
}
lastPoint = point;
// Capture mouse until MouseUp event is received
drawingCanvas.CaptureMouse();
}
// Touch down event handler.
/// <summary>
/// 输入一个点，判定是否为手势，是则不需要在继续判断，手指离开时，将手势标识设置为false
/// 如果不是则继续判断是否为手势.
/// </summary>
/// <param name="drawingCanvas"></param>
/// <param name="e"></param>
public void TouchDownHandler(DrawingCanvas drawingCanvas, TouchEventArgs e)
{
GestureData.Fingers++;//记录手指数
GraphicsPolyLine polyLine;
TouchPoint touchPoint = e.GetTouchPoint(drawingCanvas);
Point p = touchPoint.Position;
if (GestureData.Fingers == 1)//记录第一个手指的基本信息，后后续手势判断使用
{
if (!GestureData.IsSignFoFingerOne)
{
GestureData.IsTouch = true;
GestureData.FirstDeviceId = e.TouchDevice.Id;
GestureData.FirstFingerBeginPoint = p;
GestureData.FirstFingerCurPoint = p;
GestureData.IsSignFoFingerOne = true;
}
}
HelperFunctions.IsGesture(drawingCanvas, e);//判断是否为手势
//如果是手势，则将第一个手指画的几何型的Candraw属性置为false,使得后续不在画出来
if (GestureData.IsGesture && GestureData.Fingers == 2 && _activeStrokes.TryGetValue(GestureData.FirstDeviceId, out polyLine))
{
polyLine.CanDraw = false;
}
if (_activeStrokes.TryGetValue(e.TouchDevice.Id, out polyLine))
{
FinishStroke(polyLine);
return;
}
//当手指的个数大于2时，将第一个手指与第二个手指的canDraw属性置回true
if (!GestureData.IsGesture && GestureData.Fingers > 2)
{
if (_activeStrokes.TryGetValue(GestureData.FirstDeviceId, out polyLine))
{
polyLine.CanDraw = true;
}
if (_activeStrokes.TryGetValue(GestureData.SecondDeviceId, out polyLine))
{
polyLine.CanDraw = true;
}
}
// Create new stroke, add point and assign a color to it.
GraphicsPolyLine newPolyLine = new GraphicsPolyLine(
new Point[]
{
p,
new Point(p.X + 1, p.Y + 1)
},
drawingCanvas.LineWidth,
drawingCanvas.ObjectColor,
drawingCanvas.ActualScale);
newPolyLine.DeviceID = e.TouchDevice.Id;
//是手势并且是第二个手指，将其画的几何的CanDraw置为false，不用画
if (GestureData.IsGesture && GestureData.Fingers == 2)
{
if (!GestureData.IsSignForFingerTwo)
{
GestureData.SecondDeviceId = e.TouchDevice.Id;
GestureData.SecFingerBeginPoint = p;
GestureData.StartDistInTwoFingers = HelperFunctions.CalcDistanceSquare(GestureData.FirstFingerBeginPoint, GestureData.SecFingerBeginPoint);
GestureData.StartCenterPointInTwoFingers = HelperFunctions.getCenterPoint(GestureData.FirstFingerBeginPoint, GestureData.SecFingerBeginPoint);
GestureData.SecFingerCurPoint = p;
newPolyLine.CanDraw = false;
GestureData.IsSignForFingerTwo = true;
if (GestureData.FirstFingerBeginPoint.X < GestureData.SecFingerBeginPoint.X)
{
GestureData.MaxPositionX = true;
}
}
}
//防止已经是手势了，但因为用户不小心使得其他手指不小心碰到了触控，需要使得该误碰的手写内容不画出来
if (GestureData.IsGesture && GestureData.Fingers > 2)
{
newPolyLine.CanDraw = false;
}
AddNewObject(drawingCanvas, newPolyLine);
// Add new stroke to the collection of strokes in drawing.
_activeStrokes[newPolyLine.DeviceID] = newPolyLine;
System.Diagnostics.Debug.WriteLine("Touchdown:{0}", GestureData.IsGesture);
}
