Meegu_Run_Class/CrossLine.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace Meegu_Run_Class
{
    public static class CrossLine
    {
        /// <summary>   
        /// 判断直线2的两点是否在直线1的两边。   
        /// </summary>   
        /// <param name="line1">直线1</param>   
        /// <param name="line2">直线2</param>   
        /// <returns></returns>   
        private static bool CheckCrose(Line line1, Line line2)
        {
            PointF v1 = new PointF();
            PointF v2 = new PointF();
            PointF v3 = new PointF();

            v1.X = line2.Start.X - line1.End.X;
            v1.Y = line2.Start.Y - line1.End.Y;

            v2.X = line2.End.X - line1.End.X;
            v2.Y = line2.End.Y - line1.End.Y;

            v3.X = line1.Start.X - line1.End.X;
            v3.Y = line1.Start.Y - line1.End.Y;

            return (CrossMul(v1, v3) * CrossMul(v2, v3) <= 0);

        }
       
        
        /// <summary>   
        /// 计算两个向量的叉乘。   
        /// </summary>   
        /// <param name="pt1"></param>   
        /// <param name="pt2"></param>   
        /// <returns></returns>   
        private static float CrossMul(PointF pt1, PointF pt2)
        {
            return pt1.X * pt2.Y - pt1.Y * pt2.X;
        }

        /// <summary>   
        /// 判断两条线段是否相交。   
        /// </summary>   
        /// <param name="line1">线段1</param>   
        /// <param name="line2">线段2</param>   
        /// <returns>相交返回真，否则返回假。</returns>   
        public static bool IsLineCrose(Line line1, Line line2, ref PointF intersection)
        {
            return GetIntersection(line1.Start, line1.End, line2.Start, line2.End, ref intersection) == 1;
        }

        /// <summary>   
        /// 判断两条线段是否相交。