예제 #1
0
        /// <summary>
        /// Creates an arc with the given center, start, and end points. Performs a check
        /// at the given precision to make sure that both the start and end points are
        /// the same distance from the center, throwing an exception if they're not. Note
        /// that because radius is generated from start point, the resultant arc's start
        /// point will be more accurate than the end point.
        /// </summary>
        /// <param name="center">Center of the arc.</param>
        /// <param name="startPoint">Start point of the arc.</param>
        /// <param name="endPoint">Point that end angle is projected through.</param>
        /// <param name="decimals">Precision at which to check the distance of the endpoints to the center.
        /// A negative value will perform an exact check.</param>

        public Arc2D(Point2D center, Point2D startPoint, Point2D endPoint, int decimals = 15)
            : this(center, center.DistanceTo(startPoint), 0, 0)
        {
            if ((decimals < 0 && center.DistanceTo(endPoint) != Radius) || (decimals >= 0 && center.DistanceTo(endPoint).RoundFromZero(decimals) != Radius.RoundFromZero(decimals)))
            {
                throw new Exception("Can't create arc from center and endpoints because endpoints have different distances from the center!");
            }

            _startAngle = Circle.AngleThroughPoint(startPoint);
            _endAngle   = Circle.AngleThroughPoint(endPoint);
        }
예제 #2
0
        /// <summary>
        /// Creates an arc on the given circle with the start angle projected through
        /// the start point and the end angle projected through the end point.
        /// </summary>
        /// <param name="c">Circle that the arc lies on.</param>
        /// <param name="startPoint">Point that start angle is projected through.</param>
        /// <param name="endPoint">Point that end angle is projected through.</param>

        public Arc2D(Circle2D c, Point2D startPoint, Point2D endPoint)
        {
            this.Circle = c;
            _startAngle = c.AngleThroughPoint(startPoint);
            _endAngle   = c.AngleThroughPoint(endPoint);
        }