Txgy.EWS.Client/Txgy.EWS.Client.FocalMechanism/Model/Line.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Txgy.EWS.Client.FocalMechanism.Model
{

    public class Line : Graph
    {
        public int angle;
        public double dis;
        public double p1x;
        public double p1y;
        public double p2x;
        public double p2y;
        public Line(int a, double d)
        {
            angle = a;
            dis = d;
        }

        public void compute(double xmax, double xmin, double ymax, double ymin)
        {
            if (angle == 90)
            {
                p1x = p2x = 0 - dis;
                p1y = ymin;
                p2y = ymax;
                return;
            }
            double tan = Math.Tan(angle * Math.PI / 180);
            double cos = Math.Cos(angle * Math.PI / 180);
            double sin = Math.Sin(angle * Math.PI / 180);
            p2x = xmax;
            p2y = p2x * tan + dis / cos;
            p1x = xmin;
            p1y = p1x * tan + dis / cos;

            //make sure point 1 is under point 2
            if (p1y > p2y)
            {
                double tem = p1x;
                p1x = p2x;
                p2x = tem;
                tem = p1y;
                p1y = p2y;
                p2y = tem;
            }
            if (p2y > ymax)
            {
                p2y = ymax;
                p2x = p2y / tan - dis / sin;
            }
            if (p1y < ymin)
            {
                p1y = ymin;
                p1x = p1y / tan - dis / sin;
            }
        }
    }
}