namespace HydroUI
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{
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/// <summary>
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/// 几何计算辅助类
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/// </summary>
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internal class GraphHelper
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{
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public static Color getNodeColor(Colour colour, NodeViewModel node)
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{
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double value = 0;
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Color color = Color.Gray;
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switch (colour.Type)
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{
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case ColourType.节点自由压力:
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value = node.EN_PRESSURE;
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break;
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case ColourType.节点绝对压力:
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value = node.EN_HEAD;
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break;
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case ColourType.节点需水量:
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value = node.EN_DEMAND;
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break;
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}
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for (int i = 0; i < colour.Items.Count; i++)
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{
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if (colour.Items[i].DRange.IsInside(value))
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{
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color = colour.Items[i].value;
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break;
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}
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}
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return color;
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}
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public static Color getLinkColor(Colour colour, LinkViewModel link)
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{
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double value = 0;
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Color color = Color.Gray;
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switch (colour.Type)
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{
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case ColourType.管线流量:
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value = link.EN_FLOW;
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break;
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case ColourType.管线流速:
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value = link.EN_VELOCITY;
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break;
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}
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for (int i = 0; i < colour.Items.Count; i++)
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{
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if (colour.Items[i].DRange.IsInside(value))
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{
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color = colour.Items[i].value;
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break;
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}
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}
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return color;
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}
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public static long GetUlongByPoint(PointF ps, float delta = 20, int MaxY = 2000)
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{
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return (long)((int)(ps.X / delta) + ((int)Math.Round(ps.Y / delta)) * MaxY / delta);
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}
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public static List<PointF> Get等分Nodes(PointF p1, PointF p2, int n)
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{
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// 计算线段长度
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float len = (float)Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2));
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if (len == 0) len = 0.00001f;
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// 计算单位向量
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PointF u = new PointF((p2.X - p1.X) / len, (p2.Y - p1.Y) / len);
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// 计算间距
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float d = len / (n + 1);
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// 计算n等分点
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List<PointF> nodes = new List<PointF>();
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for (int i = 1; i < n + 1; i++)
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{
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PointF node = new PointF(p1.X + i * d * u.X, p1.Y + i * d * u.Y);
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if (node.X == float.NaN || node.Y == float.NaN) node = p1;
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nodes.Add(node);
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}
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return nodes;
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}
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public static PointF getRotatePoint(float px, float py, PointF center, PointF x, PointF y)
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{
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PointF p = new PointF(px, py);
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return getRotatePoint(p, center, x, y);
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}
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private static PointF getRotatePoint(PointF p, PointF center, PointF x, PointF y)
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{
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float angle = (float)Math.Atan2(y.Y - x.Y, y.X - x.X);
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float distance = (float)Math.Sqrt(Math.Pow(p.X - center.X, 2) + Math.Pow(p.Y - center.Y, 2));
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float rotationAngle = (float)(Math.Atan2(p.Y - center.Y, p.X - center.X) + angle);
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float rotatedX = center.X + distance * (float)Math.Cos(rotationAngle);
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float rotatedY = center.Y + distance * (float)Math.Sin(rotationAngle);
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return new PointF(rotatedX, rotatedY);
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}
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}
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}
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