private void UpdateCircles()
{
if (_useOpacity)
{
for (var i = 0; i < _circles.Length; i++)
{
_circles[i].Opacity = 1 - ((i + _offset) % _circles.Length) * 0.11;
}
_offset = (_offset + 1) % _circles.Length;
}
else
{
_rotateTransform.Angle = (_rotateTransform.Angle + 36) % 360;
}
Canvas1.InvalidateVisual();
}
private void Canvas1_TouchDown(object sender, TouchEventArgs e)
{
var pt = e.GetTouchPoint(Canvas1);
// 縦線を作ります。
var lineV = new Line();
lineV.X1 = lineV.X2 = pt.Position.X;
lineV.Y1 = 0;
lineV.Y2 = ActualHeight;
lineV.Stroke = Brushes.Red;
Canvas1.Children.Add(lineV);
lineVList[e.TouchDevice] = lineV;
// 横線を作ります。
var lineH = new Line();
lineH.X1 = 0;
lineH.X2 = ActualWidth;
lineH.Y1 = lineH.Y2 = pt.Position.Y;
lineH.Stroke = Brushes.Red;
Canvas1.Children.Add(lineH);
lineHList[e.TouchDevice] = lineH;
// 円を作ります。
var ellipse = new Ellipse();
ellipse.Width = 50;
ellipse.Height = 50;
ellipse.Fill = Brushes.Blue;
ellipse.RenderTransform
= new TranslateTransform(pt.Position.X - ellipse.RenderSize.Width / 2,
pt.Position.Y - ellipse.RenderSize.Height / 2);
Canvas1.Children.Add(ellipse);
ellipseList[e.TouchDevice] = ellipse;
// idを表すラベルを作ります。
var label = new Label();
label.Foreground = Brushes.White;
label.FontSize = 36;
label.Content = e.TouchDevice.Id;
label.RenderTransform = new TranslateTransform(pt.Position.X - label.RenderSize.Width / 2,
pt.Position.Y - label.RenderSize.Height / 2);
Canvas1.Children.Add(label);
labelList[e.TouchDevice] = label;
Canvas1.InvalidateVisual();
Canvas1.CaptureTouch(e.TouchDevice);
}