public void PerpendicularTest()
{
var line = new SKLine(new SKPoint(-1, 0), new SKPoint(2, 0));
var point = new SKPoint(0, 0);
var rez = Perpendicular(line, point);
var onLine = line.OnLine(rez);
var dest = line.MinimalDistance(point);
}
private SKPoint Perpendicular(SKLine line, SKPoint point)
{
var a = line.Point1;
var b = line.Point2;
var c = point;
var F0 = c.X - (b.Y - a.Y);
var F1 = c.Y + (b.X - a.X);
var k2 = ((c.X - a.X) * (b.Y - a.Y) - (b.X - a.X) * (c.Y - a.Y)) / ((b.X - a.X) * (F1 - c.Y) - (F0 - c.X) * (b.Y - a.Y));
var d0 = (F0 - c.X) * k2 + c.X;
var d1 = (F1 - c.Y) * k2 + c.Y;
//perpendicular = New Point3d(d(0), d(1), 0)
return(new SKPoint(d0, d1));
}
private bool PointOnLine(SKLine line, SKPoint point)
{
var x = line.Point1.X;
var y = line.Point1.Y;
var x0 = line.Point2.X;
var y0 = line.Point2.Y;
var dx = point.X;
var dy = point.Y;
var f0 = (y - y0);
var f1 = (x - x0);
return(Math.Abs((dy - y0) * f1 - (dx - x0) * f0) < 0.0001);
}
private ICollection <SKLine> GenerateLines(Course value)
{
if (value.Waypoints.Length < 2)
{
return(Array.Empty <SKLine>());
}
var firstPoint = value.Waypoints.First().ToSkPoint();
return(value.Waypoints
.Skip(1)
.Select(
v =>
{
var skPoint = v.ToSkPoint();
var skLine = new SKLine(firstPoint, skPoint);
firstPoint = skPoint;
return skLine;
}
)
.ToArray());
}
public static void DrawLine(this SKCanvas canvas, SKLine line, SKPaint paint)
{
canvas.DrawLine(line.P1.X, line.P1.Y, line.P2.X, line.P2.Y, paint);
}
private bool PointOnSegment(SKLine line, SKPoint point)
{
return(LinearArithmetic.IsBetween(line.Point1.X, line.Point1.Y, line.Point2.X, line.Point2.Y, point.X, point.Y));
}
public void PointOnLine()
{
var line = new SKLine(new SKPoint(1, 0), new SKPoint(2, 0));
var point = new SKPoint(0, 0);
var rez = PointOnSegment(line, point);
}
protected static bool InRect(SKLine skLine, SKRect rect)
{
return(InRect(skLine.Point1, rect) && InRect(skLine.Point2, rect));
}
