public MainImageViewModel(IContainerExtension container, IRegionManager regionManager)
{
_container = container;
_regionManager = regionManager;
ImageSource = MainImage
.ObserveProperty(x => x.ImageSource)
.ToReadOnlyReactiveProperty();
ImageSource.Subscribe(x => InspectLinePoints.SetSourceSize(x.PixelWidth, x.PixelHeight));
// Viewの非表示時のクリア
LineLevels.ObserveProperty(x => x.IsShowingView).Where(b => !b)
.Subscribe(_ =>
{
InspectLinePoints.ClearPoints(); // 画像上のLine表示
LineLevels.ReleaseLinePoints(); // OxyPlot図(次回表示用)
});
// マウス移動開始
MouseDown.Where(_ => LineLevels.IsShowingView)
.Subscribe(p => InspectLinePoints.SetPoint1(p.X, p.Y));
// マウス移動中
var mouseMove = MouseDown.Merge(MouseDown.SelectMany(MouseMove.TakeUntil(MouseUp)))
.Where(_ => LineLevels.IsShowingView);
// ViewのLine表示は常時更新
mouseMove.Subscribe(p => InspectLinePoints.SetPoint2(p.X, p.Y));
// Line画素値の取得は重いので計算を間引く
mouseMove
.Throttle(TimeSpan.FromMilliseconds(500)) // 指定期間分だけ値が通過しなかったら最後の一つを流す
.Subscribe(_ => LineLevels.SetLinePointsRatio(InspectLinePoints.GetPointsRatio()));
}