private async void Control_PointerWheelChanged(object sender, Windows.UI.Xaml.Input.PointerRoutedEventArgs e)
{
//Debug.WriteLine("Control_PointerWheelChanged");
var pointer = e.GetCurrentPoint(Control).Properties;
if (!pointer.IsLeftButtonPressed && !pointer.IsRightButtonPressed)
{
double oldScale = Element.ViewScale;
int delta = pointer.MouseWheelDelta;
if (delta > 0)
{
Element.ViewScale = Element.ViewScale * (0.2 * delta / 120 + 1);
}
else if (delta < 0)
{
Element.ViewScale = Element.ViewScale / (0.2 * -delta / 120 + 1);
}
Point oldPoint = Element.ViewPoint.Offset(pointer.ContactRect.X / oldScale, pointer.ContactRect.Y / oldScale);
Point newPoint = Element.ViewPoint.Offset(pointer.ContactRect.X / Element.ViewScale, pointer.ContactRect.Y / Element.ViewScale);
Element.ViewPoint = Element.ViewPoint.Offset(oldPoint.X - newPoint.X, oldPoint.Y - newPoint.Y);
DrawImage = await Element.DrawImmageRequestAsync(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Control.Invalidate();
}
}
public bool OnFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
{
var x = e2.GetX();
var y = e2.GetY();
Scroller.Fling((int)x, (int)y, (int)velocityX / 4, (int)velocityY / 4, 0, Width * 5, 0, Height * 5);
Device.StartTimer(new TimeSpan(1), () => {
if (Scroller.ComputeScrollOffset())
{
var xx = Scroller.CurrX;
var yy = Scroller.CurrY;
Element.ViewPoint = Element.ViewPoint.Offset(-(xx - x) / Element.ViewScale, -(yy - y) / Element.ViewScale);
DrawImage = Element.DrawImmageRequest(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Invalidate();
}
return(!Scroller.IsFinished);
});
return(true);
}
public bool OnScale(ScaleGestureDetector detector)
{
//Debug.WriteLine("Control_PointerWheelChanged");
if (detector.PreviousSpan != detector.CurrentSpan)
{
double oldScale = Element.ViewScale;
// UWP delta とは逆値
double sclae = detector.PreviousSpan / detector.CurrentSpan;
if (sclae < 1)
{
Element.ViewScale = Element.ViewScale * (sclae * 1.1);
}
else if (sclae > 1)
{
Element.ViewScale = Element.ViewScale * (sclae / 1.1);
}
Xamarin.Forms.Point oldPoint = Element.ViewPoint.Offset(detector.FocusX / oldScale, detector.FocusY / oldScale);
Xamarin.Forms.Point newPoint = Element.ViewPoint.Offset(detector.FocusX / Element.ViewScale, detector.FocusY / Element.ViewScale);
Element.ViewPoint = Element.ViewPoint.Offset(oldPoint.X - newPoint.X, oldPoint.Y - newPoint.Y);
DrawImage = Element.DrawImmageRequest(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Invalidate();
}
return(true);
}
private async void Control_SizeChanged(object sender, Windows.UI.Xaml.SizeChangedEventArgs e)
{
//Debug.WriteLine("Control_SizeChanged");
DrawImage = await Element.DrawImmageRequestAsync(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Control.Invalidate();
}
private void Control_LayoutChange(object sender, LayoutChangeEventArgs e)
{
//Debug.WriteLine("Control_SizeChanged");
DrawImage = Element.DrawImmageRequest(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Invalidate();
}
private async void Control_ManipulationDelta(object sender, Windows.UI.Xaml.Input.ManipulationDeltaRoutedEventArgs e)
{
//Debug.WriteLine("Control_ManipulationDelta");
Element.ViewPoint = Element.ViewPoint.Offset(-e.Delta.Translation.X / Element.ViewScale, -e.Delta.Translation.Y / Element.ViewScale);
DrawImage = await Element.DrawImmageRequestAsync(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Control.Invalidate();
}
protected override async void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender, e);
if (e.PropertyName == "DeviceImage")
{
DrawImage = await Element.DrawImmageRequestAsync(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Control.Invalidate();
}
}
public bool OnScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
{
//Debug.WriteLine("Control_ManipulationDelta");
// UWP delta とは逆値
Element.ViewPoint = Element.ViewPoint.Offset(distanceX / Element.ViewScale, distanceY / Element.ViewScale);
DrawImage = Element.DrawImmageRequest(Element.ViewPoint, Matrix2.Enlargement(ViewSize, 1 / Element.ViewScale, 1 / Element.ViewScale));
Invalidate();
return(true);
}
private void Control_Draw(CanvasControl sender, CanvasDrawEventArgs args)
{
args.DrawingSession.FillRectangle(GetDeviceRect(new Rectangle(Point.Zero, ViewSize)), Windows.UI.Color.FromArgb((byte)(Element.BackgroundColor.A * 255d), (byte)(Element.BackgroundColor.R * 255d), (byte)(Element.BackgroundColor.G * 255d), (byte)(Element.BackgroundColor.B * 255d)));
if (DrawImage != null && DrawImage.Image != null)
{
Rectangle viewRect = new Rectangle
{
Location = Matrix2.Enlargement(DrawImage.DrawRect.Location.Offset(-Element.ViewPoint.X, -Element.ViewPoint.Y), Element.ViewScale, Element.ViewScale),
Size = Matrix2.Enlargement(DrawImage.DrawRect.Size, Element.ViewScale, Element.ViewScale)
};
args.DrawingSession.DrawImage(DrawImage.Image as ICanvasImage, GetDeviceRect(viewRect), GetDeviceRect(DrawImage.DrawRect), 1f, CanvasImageInterpolation.HighQualityCubic);
}
}
protected override void OnDraw(Canvas canvas)
{
base.OnDraw(canvas);
Paint paint = new Paint(PaintFlags.AntiAlias);
paint.Color = new Android.Graphics.Color((byte)(Element.BackgroundColor.A * 255d), (byte)(Element.BackgroundColor.R * 255d), (byte)(Element.BackgroundColor.G * 255d), (byte)(Element.BackgroundColor.B * 255d));
//paint.Color = Android.Graphics.Color.Honeydew;
paint.SetStyle(Paint.Style.Fill);
canvas.DrawRect(new Rect(0, 0, Width, Height), paint);
if (DrawImage != null && DrawImage.Image != null)
{
Rectangle viewRect = new Rectangle
{
Location = Matrix2.Enlargement(DrawImage.DrawRect.Location.Offset(-Element.ViewPoint.X, -Element.ViewPoint.Y), Element.ViewScale, Element.ViewScale),
Size = Matrix2.Enlargement(DrawImage.DrawRect.Size, Element.ViewScale, Element.ViewScale)
};
canvas.DrawBitmap(DrawImage.Image as Bitmap, GetDeviceRect(DrawImage.DrawRect), GetDeviceRect(viewRect), null);
//canvas.DrawBitmap(DrawImage.Image as Bitmap, GetDeviceRect(viewRect), GetDeviceRect(DrawImage.DrawRect), null);
}
}
