PlaneGame/TracBullet.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace PlaneGame
{
    public class TracBullet:bullet
    {
        private int _Enemy_x;
        private int _Enemy_y;
        private float a=0;//斜率
        private float b=0;//直线方程中的b
        private bool fire = false;
        private int mothedx = 0; //运行方式x
        private int mothedy = 0; //运行方式y
        //private int mothedx1 = 0; //运行方式x1
        //private int mothedy1 = 0; //运行方式y1  

        public int Enemy_x
        {
            get { return _Enemy_x; }
            set { _Enemy_x = value;}
        }

        public int Enemy_y
        {
            get { return _Enemy_y; }
            set { _Enemy_y = value;}
        }

        public void Move(PaintEventArgs e)
        {
            //try
            //{
                if (fire == false)
                {                  
                    fire = true;
                    if (Enemy_y - bulltet_y != 0 && Enemy_x - bulltet_x != 0)
                    {
                        b = Convert.ToSingle((Enemy_y - bulltet_y) * this.Spleed / (Enemy_x - bulltet_x));
                    }

                    if (b > 10)
                    {
                        Spleed = Convert.ToUInt16(10 * (Enemy_x - bulltet_x) / (Enemy_y - bulltet_y));
                        b = 10;
                    }
                    if (this.bulltet_x < Enemy_x)
                    {
                        mothedx = 0;
                    }
                    else if (this.bulltet_x > Enemy_x)
                    {
                        mothedx = 1;
                    }                   
                    if (this.bulltet_y > Enemy_y)
                    {
                        mothedy = 0;