public static Triangle FromTwoPointsAndTwoLengths(Point point1, Point point2, double l1, double l2)
{
double l3 = point1.Distance(point2);
double area = Triangle.AreaByLenghts(l1, l2, l3);
double angle = Math.Asin(2 * area / (l1 * l3));
Vector horizontal = point1.VectorTo(point1.AddX(1));
double angle0 = horizontal.AngleWith(point1.VectorTo(point2));
double x = l1 * Math.Cos(angle0 - angle);
double y = l1 * Math.Sin(angle0 - angle);
Point point3 = point1.AddX(x).AddY(y);
return new Triangle(point1, point2, point3);
}
public static Triangle FromTwoPointsAndTwoLengths(Point point1, Point point2, double l1, double l2)
{
double l3 = point1.Distance(point2);
double area = Triangle.AreaByLenghts(l1, l2, l3);
double angle = Math.Asin(2 * area / (l1 * l3));
Vector horizontal = point1.VectorTo(point1.AddX(1));
double angle0 = horizontal.AngleWith(point1.VectorTo(point2));
double x = l1 * Math.Cos(angle0 - angle);
double y = l1 * Math.Sin(angle0 - angle);
Point point3 = point1.AddX(x).AddY(y);
return(new Triangle(point1, point2, point3));
}
public static Point[] CalcBezier(Point pStart, Point pEnd, bool p1left = true, bool p2left = false)
{
var top = pStart.Y < pEnd.Y ? pStart.Y : pEnd.Y;
var bottom = top == pStart.Y ? pEnd.Y : pStart.Y;
var left = pStart.X < pEnd.X ? pStart.X : pEnd.X;
var right = left == pStart.X ? pEnd.X : pStart.X;
var disX = right - left;
var disY = bottom - top;
var ps = pStart;
var p1 = p1left ? pStart.AddX(40) : pStart.SubX(40);
var p2 = p2left ? pEnd.AddX(40) : pEnd.SubX(40);
var inL = p2.X < p1.X ? p2.X : p1.X;
var pM = p1left != p2left ? new Point(left + disX / 2, top + disY / 2) : new Point(inL + disX / 2, top + disY / 2);
var pE = pEnd;
return(new Point[] { ps, p1, p1, pM, p2, p2, pE });
}
