基于C#的2D太阳、地球、月亮运动轨迹模拟实现

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1.题目要求：

如题所示----基于C#的2D太阳、地球、月亮运动轨迹模拟实现。

2.研究思路：

此题目属于图形学中比较典型的有关运动轨迹实现的问题。

首先二话不说，站在面向对象的角度考虑至少包含太阳、地球、月亮三个类。由于是模拟实现，故有些相关数据并非的绝对正确。在此我们假设太阳位于屏幕的画布的中心，且静止不动（虽然有自转，但是由于是2D不好显示，并且如此假设也不影响最终整体效果，故假设之）；地球围绕太阳公转（假设运行轨迹为圆）；月亮围绕地球公转。

问题难点：地球在围绕太阳转动的同时，月亮也在围绕地球公转，并且地球公转的角速度是月亮角速度的1/12.

3.程序说明：

运行平台：windows 7

开发工具：Microsoft Visual Studio 2010

开发语言：C# 、GDI+

程序类型：Windows窗体应用程序

4.具体实现：

1）兴建工程（在此我们将此工程命名为SunEarthMoon）

打开Visual Studio 2010 -->文件-->兴建-->项目;选择Windows窗体应用程序，在"名称"后面上SunEarthMoon，然后选择程序保存的路径，单击确定即可。

如果你在你的“解决方案资源管理器”中看到有如下图示文件目录结构，那么说明你的

SunEarthMoon工程已经成功创建可以成功跳至2）了；否之，你还需要返回1），直到成功为止。

2）业务逻辑类实现

（1）在模拟的时候，由于太阳，地球，月亮他们有很多相似的地方，故在此抽象出了一个

Start的父类，里面主要包含一些公共的属性并提供一个待子类重写的draw()虚函数。

代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Drawing.Drawing2D;namespace SunEarthMoon{    class  Start    {        public  Point center;          // 星球的球星        public  Point movingCenter;    //星球公转轨迹的中心        public  int radius;            //星球的半径        public  int movingRadius;      //星球公转的半径        public  Graphics graphics;      //绘制的画布        public  Color bgcolor;          //星球的背景色        public virtual void draw() {        }    }}

（2）然后是Sun、Earth、Moon类的具体实现；他们都继承至Start，都重写了draw方法而已。

代码如下：

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Drawing.Drawing2D;namespace SunEarthMoon{    class Sun :Start    {        public Sun()        {                }        public Sun(Point center, Point movingCenter, int radius, int movingRadius ,Graphics graphics,Color bgColor)         {            this.center = center;            this.movingCenter = movingCenter;            this.radius = radius;            this.movingRadius = movingRadius;            this.graphics = graphics;            this.bgcolor = bgColor;                    }        public override void draw()         {            graphics.FillPie(new SolidBrush(bgcolor), center.X-radius, center.Y-radius, 2 * radius, 2 * radius, 0, 360);        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Drawing.Drawing2D;namespace SunEarthMoon{    class Earth :Start    {         public Earth()        {                }         public Earth(Point center, Point movingCenter, int radius, int movingRadius, Graphics graphics, Color bgColor)         {            this.center = center;            this.movingCenter = movingCenter;            this.radius = radius;            this.movingRadius = movingRadius;            this.graphics = graphics;            this.bgcolor = bgColor;                    }        public override void draw()         {            graphics.FillPie(new SolidBrush(bgcolor), center.X-radius, center.Y-radius, 2 * radius, 2 * radius, 0, 360);        }    }}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Drawing.Drawing2D;namespace SunEarthMoon{    class Moon :Start    {         public Moon()        {                }         public Moon(Point center, Point movingCenter, int radius, int movingRadius, Graphics graphics, Color bgColor)         {            this.center = center;            this.movingCenter = movingCenter;            this.radius = radius;            this.movingRadius = movingRadius;            this.graphics = graphics;            this.bgcolor = bgColor;                    }        public override void draw()         {            graphics.FillPie(new SolidBrush(bgcolor), center.X-radius, center.Y-radius, 2 * radius, 2 * radius, 0, 360);                    }    }}

（3）为了方便与前台窗体的交互，在此专门设计了一个Space的类
来容纳太阳、地球、月亮；并提供与窗体的直接交互功能。

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Drawing;using System.Drawing.Drawing2D;using System.Threading;namespace SunEarthMoon{    class Space    {        private Graphics graphics;        private Start sun;        private Start earth;        private Start moon;        private Point screenCenter;        private bool isMoving = false;        private double d_angle = 2 * 3.14 * 1 / 360;        private  double angle ;        public Space(Graphics graphics, Point screenCenter)        {            this.graphics = graphics;            this.screenCenter = screenCenter;            this.sun = new Sun(screenCenter,screenCenter,50,50,graphics,Color.Yellow);            this.earth = new Earth(new Point(screenCenter.X + 200, screenCenter.Y), screenCenter, 25, 200, graphics, Color.Blue);            this.moon = new Moon(new Point(earth.center.X+50,earth.center.Y),earth.center,15,50,graphics,Color.White);            this.angle = d_angle;        }        public void draw(bool isMoving)         {           this.IsMoving = isMoving;            ThreadStart threadStart = new ThreadStart(threadDraw);            Thread thread = new Thread(threadStart);            thread.Start();                }        public void drawBg()         {            graphics.Clear(Color.Black);        }        private void threadDraw()         {                int dx_e = 200;                int dx_m = 50;                while (true)                {                    sun.draw();                    earth.draw();                    moon.draw();                    earth.center.X = screenCenter.X + (int)(dx_e * Math.Cos(angle));                    earth.center.Y = screenCenter.Y + (int)(dx_e * Math.Sin(angle));                    moon.center.X = earth.center.X + (int)(dx_m * Math.Cos(-angle * 12));                    moon.center.Y = earth.center.Y + (int)(dx_m * Math.Sin(-angle * 12));                    moon.movingCenter = earth.center;                    angle += d_angle;                    Thread.Sleep(400);                    if (!IsMoving)                        break;                    drawBg();                   }        }        public bool IsMoving        {            get { return isMoving; }            set { isMoving = value; }        }        public double D_angle        {            get { return d_angle; }            set { d_angle = value; }        }     }}

3）窗体设计（包含窗体事件的实现）

(1) 窗体界面设计

左键双击解决方案中的“Form1.cs”；利用VS2010自带的工具箱，在Form1的设计界面上（Form1.cs[设计]），设计出如下界面；并通过修改控件属性，达到如图效果：

（2）Form1界面事件具体实现

左键双击Form1界面中的任意一个控件，即可跳到Form1.cs界面，在这里我们将添加所有控件的响应事件。

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace SunEarthMoon{    public partial class Form1 : Form    {        private Space space;        private bool isMoving = false;        private double i = 1;        public Form1()        {            InitializeComponent();            space = new Space(this.panel2.CreateGraphics(),new Point(this.panel2.Width/2,this.panel2.Height/2));        }        private void panel2_Paint(object sender, PaintEventArgs e)        {            space.drawBg();        }        private void button1_Click(object sender, EventArgs e)        {            if (!isMoving )                isMoving = true;            space.draw(isMoving);            label1.Text = "速度：" + i + "*X";        }        private void button2_click(object sender, EventArgs e)        {                        space.IsMoving = false;            isMoving = false;            label1.Text = "暂停中...";        }        private void button3_click(object sender, EventArgs e)        {            if (isMoving)            {                i = i * 2;                space.D_angle = 2.0 * space.D_angle;                label1.Text = "速度：" + i + "*X";            }            else {                label1.Text = "暂停中...";            }                    }        private void button4_click(object sender, EventArgs e)        {            if (isMoving)            {                i = i / 2.0;                space.D_angle = space.D_angle / 2.0;                label1.Text = "速度：" + i + "*X";            }            else {                label1.Text = "暂停中...";            }                    }    }}