/* goblins template  - C# version converted from Java 10/2003 */

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class goblinapp : System.Windows.Forms.Form
{
      private System.ComponentModel.Container components = null;
      public static int XBOUND = 800;  // width of window
      public static int YBOUND = 600;  // height of window
      public static int STEP = 4;    // default movement speed
      public static int FDELAY = 30; // animation frame delay
      private Bitmap dbuffer;     // double buffer
      private Graphics displaydc; // for screen
      private Graphics bufferdc;  // for double buffer
      public SolidBrush brush = new SolidBrush( Color.Green );
      public Pen pen = new Pen( Color.Green );
      public Random randnum = new Random(); // random num generator
      public static bool stop = false;  // controls game
      private human professor;  

      // constructor
      public goblinapp()
      {
         InitializeComponent();
      }

      private void InitializeComponent()
      {
         components = new System.ComponentModel.Container();
         this.Size = new System.Drawing.Size(XBOUND,YBOUND);
         this.Name = "goblinapp";
         this.Text = "Professor versus the Goblins";
	 this.BackColor = Color.Black;
         this.Load += new System.EventHandler(init);
	 this.KeyDown +=new KeyEventHandler(handlekeys);
      }

      [STAThread]
      static void Main() 
      {
	 goblinapp theapp = new goblinapp();
         Application.Run(theapp);
      }

      // Event handlers
      protected override void OnPaintBackground(PaintEventArgs pe)
      {} // don't autopaint to control animation 

      protected override void OnPaint(PaintEventArgs paintEvent )
      { 
	mainloop();
      }

      private void handlekeys(object sender, KeyEventArgs ke)
      {
        ke.Handled = true;
	switch(ke.KeyCode)  
        {
 	  case Keys.Left:   professor.setdirection(-1*STEP,0); break;
	  case Keys.Right:  professor.setdirection(STEP,0);  break;
	  case Keys.Up:     professor.setdirection(0,-1*STEP); break;
	  case Keys.Down:   professor.setdirection(0,STEP); break;
	  case Keys.Space:  professor.setdirection(0,0); break;
	  default:          break;
        } // switch
      }

/*  utility function you might need: (distance between two coordinates)
*/
    public static double dist(int x1, int y1, int x2, int y2) 
    { 
        int dx = (x1-x2) * (x1-x2); 
        int dy = (y1-y2) * (y1-y2); 
        return Math.Sqrt(dx+dy); 
    } 

  /* ------------------------------------------------------------- */

      public void init(object o, System.EventArgs e)      
      {
         // get display contexts
	 displaydc = this.CreateGraphics();
         dbuffer = new Bitmap(XBOUND,YBOUND);
	 bufferdc = Graphics.FromImage(dbuffer); 
	 bufferdc.FillRectangle(brush,0,0,XBOUND,YBOUND); // clear bkground
	 professor = new human(XBOUND-50,YBOUND-50,bufferdc,"man15.gif",14);
      } // end method init

      private void mainloop()
      {  
       if (!stop)
       {
	 professor.move();

         // don't touch the following, and make sure all your "moves" are above
	 displaydc.DrawImage(dbuffer,0,0);  // writes buffer to screen
	 System.Threading.Thread.Sleep(FDELAY);  // delay between frames (ms)
	 bufferdc.FillRectangle(brush,0,0,XBOUND,YBOUND); // clear bkground
	 Invalidate();   // recursive call to OnPaint
       } // !stop

       /* display a message when done! 
       displaydc.DrawString("The Professor Wins!",
			 new Font("Serif",28),
			 new SolidBrush(Color.Red),
                         (XBOUND/2)-135,(YBOUND/2)-30); 
       */
      } // mainloop

} // end class goblinapp


/* class for players */

public class human
{
   private Image img;   // animated gif
   private int xcord, ycord;        // coordinates of center
   private int dx, dy;   // movement vector
   int radius;
   private Graphics dc;
   private int XBOUND = goblinapp.XBOUND;
   private int YBOUND = goblinapp.YBOUND;

   // For animation control of gifs
   // ... this took me a LONG time to figure out!
   private System.Drawing.Imaging.FrameDimension fdim;  
   private int framecount;
   private int frame;   // current frame

    // C# "properties": when you say object.X, you are calling the "get" code,
    // and when you say object.X = 2, you are calling the "set code".
    public int X
    {
     	get
	{ return xcord; }
    }

    public int Y
    {
     	get
	{ return ycord; }
    }

    public int R
    {
     	get
	{ return radius; }
    }
 
    public int DX 
    {
	get
	{ return dx; }
	set
	{ dx = value; }  // value is a keyword in C#
    }

    public int DY 
    {
	get
	{ return dy; }
	set
	{ dy = value; }  // value is whatever you're trying to assign to DY
    }
   
   public human(int x0, int y0,Graphics b0,string gif,int r0)  // constructor
    { 
      xcord = x0;
      ycord = y0;
      img = Image.FromFile(gif);  // load animated gif file
      radius = r0;    // may need to fine-tune
      dc = b0;        // divice context in Windows GDI+ allows drawing
      dx = dy = 0;    // initial movement vector

      // set info for number of animation dimension and frames in gif:
      Guid[] fdlist = img.FrameDimensionsList;
        fdim = new System.Drawing.Imaging.FrameDimension(fdlist[0]);
      framecount = img.GetFrameCount(fdim);  // assume only 1 dimension
      frame = 0;      
    }  // constructor

    public void draw()
    {
	img.SelectActiveFrame(fdim,frame);  // select animation frame
	frame = (frame + 1) % framecount;   // advance to next frame
	dc.DrawImage(img,xcord-radius,ycord-radius);
        //dc.DrawEllipse(new Pen(Color.Red),xcord-radius,ycord-radius,2*radius,2*radius);  // uncomment to see circle
    }   

    public void setdirection(int newdx, int newdy)
    {  
	dx = newdx;
	dy = newdy;
    }

    public void move()   // will wrap around edges of window
    {
	xcord = xcord + dx;
	if (xcord < radius/2) xcord = XBOUND-(radius/2);
	if (xcord > XBOUND-(radius/2)) xcord = radius/2;
	ycord = ycord + dy;
	if (ycord < radius/2) ycord = YBOUND-(radius/2);
	if (ycord > YBOUND-(radius/2)) ycord = radius/2;
	draw();
    }
    
} // end class human