public SKPoint PerpendicularPointOnLine(SKPoint point)
{
// /*
//A(xa,ya), B(xb,yb), C(xc,yc).
//AB(dx,dy) = (xb-xa, yb-ya).
//BC(dy,-dx) //поверь на слово
//C = B + BC = (xb+dy, yb-dx) = (xb+yb-ya, yb+xa-xb).
// */
// var xa = Point1.X;
// var ya = Point1.Y;
// var xb = Point2.X;
// var yb = Point2.Y;
// var xc = point.X;
// var yc = point.Y;
// var x = ((xa - xb) * xc / (yb - ya) - (yb - ya) * xa / (xb - xa) + ya - yc) /
// ((xa - xb) / (yb - ya) - (yb - ya) / (xb - xa));
// var y = (xa - xb) * x / (yb - ya) - (xa - xb) * xc / (yb - ya) + yc;
LinearArithmetic.Perpendicular(Point1.X, Point1.Y, Point2.X, Point2.Y, point.X, point.Y, out var pointX, out var pointY);
return(new SKPoint(pointX, pointY));
}
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 bool OnLine(SKPoint point)
{
return(LinearArithmetic.IsBetween(Point1.X, Point1.Y, Point2.X, Point2.Y, point.X, point.Y));
}
