/// <summary>
/// 文字列にシリアライズされた手描き入力を復元する.
/// </summary>
/// <param name="text"></param>
/// <returns></returns>
private static InputTraceBase ParseTrace(string text)
{
JsonArray jsonArray;
if (!JsonArray.TryParse(text, out jsonArray))
{
return(null);
}
InputTraceKind kind;
if (!Enum.TryParse(jsonArray.GetStringAt(0), out kind))
{
return(null);
}
InputTraceBase trace;
switch (kind)
{
case InputTraceKind.BeginStroke:
trace = new BeginStrokeTrace();
break;
case InputTraceKind.MoveStroke:
trace = new MoveStrokeTrace();
break;
case InputTraceKind.EndStroke:
trace = new EndStrokeTrace();
break;
case InputTraceKind.RemoveStroke:
trace = new RemoveStrokeTrace();
break;
case InputTraceKind.SetStrokeColor:
trace = new SetStrokeColorTrace();
break;
case InputTraceKind.SetStrokeThickness:
trace = new SetStrokeThicknessTrace();
break;
case InputTraceKind.SetBackgroundColor:
trace = new SetBackgroundColorTrace();
break;
case InputTraceKind.SetImage:
trace = new SetImageTrace();
break;
default:
return(null);
}
trace.LoadFromJson(jsonArray);
return(trace);
}
/// <summary>
/// PointerPressedされた場所から十分に移動したら手描き入力開始として処理する.
/// </summary>
/// <param name="e"></param>
/// <returns></returns>
private bool CallBeginTraceIfMovingEnough(PointerRoutedEventArgs e)
{
BeginStrokeTrace trace;
if (!this.strokeCandidateDictionary.TryGetValue(e.Pointer.PointerId, out trace))
{
return(false);
}
var distance = this.StrokeThickness;
var pointerPoint = e.GetCurrentPoint(this.MainCanvas);
if ((Math.Abs(trace.Position.X - pointerPoint.Position.X) < distance) &&
(Math.Abs(trace.Position.Y - pointerPoint.Position.Y) < distance))
{
return(false);
}
this.strokeCandidateDictionary.Remove(e.Pointer.PointerId);
var timestamp = trace.Timestamp;
trace.Index = this.Item.InputRecorder.GetNextStrokeIndex();
// this.Item.InputRecorder.Add(trace);
this.inputRecorderForNewTrace.Add(trace);
var elem = BeginStroke(trace);
this.pressedPointerDictionay.Add(e.Pointer.PointerId, elem);
// properties
// - color
// - thickness
var colortrace = new SetStrokeColorTrace()
{
Timestamp = timestamp,
Index = trace.Index,
Color = this.StrokeColor,
};
SetStrokeColor(colortrace);
// this.Item.InputRecorder.Add(colortrace);
this.inputRecorderForNewTrace.Add(colortrace);
var thicknesstrace = new SetStrokeThicknessTrace()
{
Timestamp = timestamp,
Index = trace.Index,
Thickness = this.StrokeThickness,
};
SetStrokeThickness(thicknesstrace);
// this.Item.InputRecorder.Add(thicknesstrace);
this.inputRecorderForNewTrace.Add(thicknesstrace);
return(true);
}
/// <summary>
/// 手描き入力の太さを設定する.
/// </summary>
/// <param name="trace"></param>
private void SetStrokeThickness(SetStrokeThicknessTrace trace)
{
var elem = GetCanvasElement <Windows.UI.Xaml.Shapes.Polyline>(trace.Index);
if (elem == null)
{
return;
}
elem.StrokeThickness = trace.Thickness;
}