Speed problem/Jerky movement

aperson — Sat May 01, 2010 12:31 pm

Author: aperson

Posted: Sat May 01, 2010 12:31 pm

Hi everybody, I'm trying to complete HCA Assignment 2. But I have struck a problem, the images don't seem to load or sometimes they load after a couple of seconds but the movement is jerky.

Code:

using System;
using System.Drawing;
using System.Collections.Generic;
using SdlDotNet.Core;
using SdlDotNet.Graphics;
using SdlDotNet.Input;

namespace OddOneOut
{
public class OddOneOut
{
   Surface sfcGameWindow;
   const int WIDTH = 1024;
   const int HEIGHT = 768;
   int level = 1;
   List<Surface> TileTypes = new List<Surface>();
   List<Tile> Tiles = new List<Tile>();
   Random Rand = new Random();
   List<int> Directions = new List<int>();
   int DirectionPos;

   public OddOneOut ()
   {
      sfcGameWindow = Video.SetVideoMode(WIDTH, HEIGHT);

      TileTypes.Add(new Surface("media/card_1.png"));
      TileTypes.Add(new Surface("media/card_2.png"));
      TileTypes.Add(new Surface("media/card_3.png"));
      TileTypes.Add(new Surface("media/card_4.png"));
      TileTypes.Add(new Surface("media/card_5.png"));
      TileTypes.Add(new Surface("media/card_6.png"));
      TileTypes.Add(new Surface("media/card_7.png"));
      TileTypes.Add(new Surface("media/card_8.png"));

      GenerateDirections();
      NewLevel();
   }

public void Run() {
Video.WindowCaption = "Odd One Out";
Events.Tick += new EventHandler<TickEventArgs>(Events_Tick);
Events.Quit += new EventHandler<QuitEventArgs>(Events_Quit);
Events.Run();
}

void Events_Tick(object sender, TickEventArgs e) {
      Update(e.SecondsElapsed);
      Draw();
}

   void Update(float elapsed){
      foreach(Tile tile in Tiles){
         tile.X += Convert.ToSingle(tile.xmove * elapsed);
         tile.Y += Convert.ToSingle(tile.ymove * elapsed);
      }
   }

   void Draw(){
      sfcGameWindow.Fill(Color.Black);

      foreach(Tile tile in Tiles){
         sfcGameWindow.Blit(TileTypes[tile.Type], new Point(Convert.ToInt32(tile.X),
            Convert.ToInt32(tile.Y)));
      }
   }

   void GenerateDirections(){
      for (int i = 0; i < 360; ++i) {
         if (i < 10) continue;
      if (i >= 350) continue;
      if (i > 80 && i < 100) continue;
      if (i > 170 && i < 190) continue;
      if (i > 260 && i < 280) continue;

      Directions.Add(i);
      }
   }

   int ChooseDirection(){
      ++DirectionPos;
      if (DirectionPos == Directions.Count) DirectionPos = 0;
      return Directions[DirectionPos];
   }

   void ShuffleList<T>(List<T> list){
      for (int i = 0; i < list.Count; i++){
         T tmp = list[i];
         list.RemoveAt(i);
         list.Insert(Rand.Next(0, list.Count), tmp);
      }
   }

   void NewLevel(){
      Tiles.Clear();
      GenerateTiles();
   }

   void GenerateTiles(){
      ShuffleList(TileTypes);
      for(int i = 0; i < TileTypes.Count; i++){
         int numberOfTiles;
         if(i == 0) numberOfTiles = 1;
         else numberOfTiles = Rand.Next(2,level+2);
         for(int y = 0; y < numberOfTiles; y++){
            Tile tile = new Tile();
            tile.X = Rand.Next(WIDTH);
            tile.Y = Rand.Next(HEIGHT);
            tile.Speed = Rand.Next(70, 120);
            tile.Direction = ChooseDirection();
            tile.xmove = (Math.Cos(tile.Direction * Math.PI / 180) * tile.Speed);
            tile.ymove = (Math.Sin(tile.Direction * Math.PI / 180) * tile.Speed);
            tile.Type = i;
            Tiles.Add(tile);
         }
      }
   }

void Events_Quit(object sender, QuitEventArgs e) {
Events.QuitApplication();
}

}
}

Code:

using System;
using System.Drawing;
using SdlDotNet.Graphics;

namespace OddOneOut
{
public class Tile
{
   public float X, Y;
   public int Direction, Speed, Type;
   public double xmove, ymove;
}
}

Any help is appreciated!

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Speed problem/Jerky movement