public LinkViewModel(PadViewModel src, PadViewModel sink)
{
this.Src = src;
this.Sink = sink;
var srcX = src.WhenAnyValue(src => src.X);
var srcY = src.WhenAnyValue(src => src.Y);
var sinkX = sink.WhenAnyValue(sink => sink.X);
var sinkY = sink.WhenAnyValue(sink => sink.Y);
var x = srcX.CombineLatest(sinkX, Math.Min).Select(x => x - Settings.LinkBezierPadding);
var y = srcY.CombineLatest(sinkY, Math.Min).Select(y => y - Settings.LinkBezierPadding);
this.x = x.ToProperty(this, x => x.X);
this.y = y.ToProperty(this, x => x.Y);
var width = srcX.CombineLatest(sinkX, (srcX, sinkX) => Math.Max(1, Math.Abs(sinkX - srcX)) + (2 * Settings.LinkBezierPadding));
var height = srcY.CombineLatest(sinkY, (srcY, sinkY) => Math.Max(1, Math.Abs(sinkY - srcY)) + (2 * Settings.LinkBezierPadding));
this.width = width.ToProperty(this, pad => pad.Width);
this.height = height.ToProperty(this, pad => pad.Height);
var srcXOffset = x.CombineLatest(srcX, (x, srcX) => srcX + Settings.PadRadius - x).Where(offset => offset >= 0);
var srcYOffset = y.CombineLatest(srcY, (y, srcY) => srcY + Settings.PadRadius - y).Where(offset => offset >= 0);
var sinkXOffset = x.CombineLatest(sinkX, (x, sinkX) => sinkX + Settings.PadRadius - x).Where(offset => offset >= 0);
var sinkYOffset = y.CombineLatest(sinkY, (y, sinkY) => sinkY + Settings.PadRadius - y).Where(offset => offset >= 0);
var start = srcXOffset.CombineLatest(srcYOffset, (x, y) => new Point(x, y));
var end = sinkXOffset.CombineLatest(sinkYOffset, (x, y) => new Point(x, y));
this.start = start.ToProperty(this, pad => pad.Start);
this.end = end.ToProperty(this, pad => pad.End);
var control1 = start.CombineLatest(width, (start, width) =>
{
return(start + new Vector(Math.Max(width / 2, 25), 0));
});
var control2 = end.CombineLatest(width, (end, width) =>
{
return(end + new Vector(-Math.Max(width / 2, 25), 0));
});
this.control1 = control1.ToProperty(this, pad => pad.Control1);
this.control2 = control2.ToProperty(this, pad => pad.Control2);
this.WhenActivated((disposables) =>
{
this.x.DisposeWith(disposables);
this.y.DisposeWith(disposables);
this.width.DisposeWith(disposables);
this.height.DisposeWith(disposables);
this.start.DisposeWith(disposables);
this.control1.DisposeWith(disposables);
this.control2.DisposeWith(disposables);
this.end.DisposeWith(disposables);
});
}
