public static Arc2D FromLinesCircle(LineSeg2D line1, LineSeg2D line2, Circle2D c, int decimals = -1)
{
Point2D[] intersects1 = null;
Point2D[] intersects2 = null;
intersects1 = c.GetIntersect(line1, decimals);
intersects2 = c.GetIntersect(line2, decimals);
throw new NotImplementedException();
}
/// <summary>
/// Returns circles that are tangent to two other circles.
/// </summary>
/// <param name="circle1">Circle that returned circles should be tangent to.</param>
/// <param name="circle2">Circle that returned circles should be tangent to.</param>
/// <param name="radius">Radius of new circles.</param>
/// <returns>External tangent circles are listed first.</returns>
public static Circle2D[] FromTangentTangentRadius(Circle2D circle1, Circle2D circle2, decimal radius)
{
Circle2D outerOrbit1 = default(Circle2D);
Circle2D outerOrbit2 = default(Circle2D);
Nullable <Circle2D> innerOrbit1 = null;
Nullable <Circle2D> innerOrbit2 = null;
List <Point2D> centerPoints = new List <Point2D>();
List <Circle2D> tangentCircles = new List <Circle2D>();
outerOrbit1 = new Circle2D(circle1.X, circle1.Y, circle1.Radius + radius);
if (radius < circle1.Radius)
{
innerOrbit1 = new Circle2D(circle1.X, circle1.Y, circle1.Radius - radius);
}
outerOrbit2 = new Circle2D(circle2.X, circle2.Y, circle2.Radius + radius);
if (radius < circle2.Radius)
{
innerOrbit2 = new Circle2D(circle2.X, circle2.Y, circle2.Radius - radius);
}
// Add intersections of outer orbits
centerPoints.AddRange(outerOrbit1.GetIntersect(outerOrbit2));
// Add intersections of outer orbit with the other's inner orbit
if (innerOrbit2.HasValue)
{
centerPoints.AddRange(outerOrbit1.GetIntersect(innerOrbit2.Value));
}
if (innerOrbit1.HasValue)
{
centerPoints.AddRange(outerOrbit2.GetIntersect(innerOrbit1.Value));
}
// Add intersections of inner orbits
if (innerOrbit1.HasValue && innerOrbit2.HasValue)
{
centerPoints.AddRange(innerOrbit1.Value.GetIntersect(innerOrbit2.Value));
}
// Now render center points to circles
for (int i = 0; i <= centerPoints.Count - 1; i++)
{
tangentCircles.Add(new Circle2D(centerPoints[i].X, centerPoints[i].Y, radius));
}
return(tangentCircles.ToArray());
}
public Point2D[] GetIntersect(Circle2D c, int decimals = -1)
{
_CheckIsValid();
return(c.GetIntersect(this, decimals));
}
