コード例 #1
0
ファイル: Polygon2D.cs プロジェクト: AlbertMin/AlbertCAD
        /// <summary>
        /// 对多边形边进行整体偏移
        /// </summary>
        /// <param name="offsetDist">正值为向外偏,负值为向内偏</param>
        /// <returns></returns>
        public Polygon2D CreateOffset(double offsetDist)
        {
            List <Line2D> extendLines = new List <Line2D>();

            Edges.ForEach(x => extendLines.Add(x.Offset((new Vector2D(x.Direction.Y, -x.Direction.X)) * offsetDist)));
            List <Line2D>   offsetLines  = new List <Line2D>();
            Vector2D        firstPoint   = extendLines.First().IntersectStraightLine(extendLines.Last());
            List <Vector2D> offsetPoints = new List <Vector2D> {
                firstPoint
            };

            for (int i = 0; i < extendLines.Count - 1; i++)
            {
                Vector2D intersect = extendLines[i].IntersectStraightLine(extendLines[i + 1]);
                if (intersect != null)
                {
                    offsetPoints.Add(intersect);
                }
            }
            offsetPoints.Add(firstPoint);
            for (int i = 0; i < offsetPoints.Count - 1; i++)
            {
                offsetLines.Add(Line2D.Create(offsetPoints[i], offsetPoints[i + 1]));
            }
            return(new Polygon2D(offsetLines));
        }
コード例 #2
0
ファイル: Rectangle2D.cs プロジェクト: AlbertMin/AlbertCAD
        private void GetRectangle(Vector2D p0, Vector2D p1, Vector2D p2, Vector2D p3)
        {
            List <Vector2D> points = new List <Vector2D> {
                p0, p1, p2, p3
            };

            points.ForEach(x => x.X = Math.Floor(x.X * 1e9) / 1e9);
            points.ForEach(x => x.Y = Math.Floor(x.Y * 1e9) / 1e9);
            Vector2D      first    = points.OrderBy(x => x.X).ThenBy(y => y.Y).First();
            List <Line2D> tryCurve = new List <Line2D>();

            for (int i = 0; i < points.Count - 1; i++)
            {
                for (int j = i + 1; j < points.Count; j++)
                {
                    tryCurve.Add(Line2D.Create(points[i], points[j]));
                }
            }
            tryCurve = tryCurve.OrderByDescending(x => x.Length).ToList();
            tryCurve.RemoveAt(1);
            tryCurve.RemoveAt(0);
            tryCurve = tryCurve.MakeCounterclockwise();
            Bottom   = tryCurve[0];
            Right    = tryCurve[1];
            Top      = tryCurve[2];
            Left     = tryCurve[3];
        }
コード例 #3
0
        /// <summary>
        /// 点到直线的距离
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public double Distance(Vector2D source)
        {
            double space = 0;
            var    a     = Length;
            var    b     = source.Distance(Start);
            var    c     = source.Distance(End);

            if (c < Extension.SMALL_NUMBER || b < Extension.SMALL_NUMBER)
            {
                return(space);
            }
            if (a < Extension.SMALL_NUMBER)
            {
                space = b;
                return(space);
            }
            if (c * c >= a * a + b * b)
            {
                space = b;
                return(space);
            }
            if (b * b >= a * a + c * c)
            {
                space = c;
                return(space);
            }
            Vector2D v1 = new Vector2D(source.X, source.Y);
            Line2D   l1 = Line2D.Create(new Vector2D(this.Start.X, this.Start.Y), new Vector2D(this.End.X, this.End.Y));

            space = Line2D.Create(v1, v1.ProjectOn(l1)).Length;
            return(space);
        }
コード例 #4
0
ファイル: Rectangle2D.cs プロジェクト: AlbertMin/AlbertCAD
        private List <Line2D> ReArragne(List <Line2D> lines)
        {
            var newLines = new List <Line2D>();

            for (int i = 0; i < lines.Count; i++)
            {
                var copyLines = new List <Line2D>(lines);
                copyLines.RemoveAt(i);
                var points = copyLines.Select(t => lines[i].IntersectStraightLine(t)).Where(point => point != null).ToList();
                newLines.Add(Line2D.Create(points[0], points[1]));
            }
            return(newLines);
        }