Post: this is awesome.
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02-24-2013, 05:16 AM
#1
Complete Speed
Do a barrel roll!
just create a new windows game application in c#
and add the following 3 files
this is just added to whatever you named your project
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Media;
using Microsoft.Xna.Framework.Net;
using Microsoft.Xna.Framework.Storage;
namespace ParticleEngine2D
{
public class Game1 : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
SpriteBatch spriteBatch;
ParticleEngine particleEngine;
public Game1()
{
graphics = new GraphicsDeviceManager(this);
graphics.PreferredBackBufferWidth = 1280;
graphics.PreferredBackBufferHeight = 720;
graphics.IsFullScreen = true;
Content.RootDirectory = "Content";
}
protected override void Initialize()
{
base.Initialize();
}
protected override void LoadContent()
{
spriteBatch = new SpriteBatch(GraphicsDevice);
List<Texture2D> textures = new List<Texture2D>();
textures.Add(Content.Load<Texture2D>("circle"));
textures.Add(Content.Load<Texture2D>("star"));
textures.Add(Content.Load<Texture2D>("diamond"));
particleEngine = new ParticleEngine(textures, new Vector2(400, 240));
}
protected override void UnloadContent()
{
}
protected override void Update(GameTime gameTime)
{
// Allows the game to exit
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
this.Exit();
particleEngine.EmitterLocation = new Vector2(Mouse.GetState().X, Mouse.GetState().Y);
particleEngine.Update();
base.Update(gameTime);
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.Black);
particleEngine.Draw(spriteBatch);
base.Draw(gameTime);
}
}
}
create a new class and name it:
particle.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework;
namespace ParticleEngine2D
{
public class Particle
{
public Texture2D Texture { get; set; }
public Vector2 Position { get; set; }
public Vector2 Velocity { get; set; }
public float Angle { get; set; }
public float AngularVelocity { get; set; }
public Color Color { get; set; }
public float Size { get; set; }
public int TTL { get; set; }
public Particle(Texture2D texture, Vector2 position, Vector2 velocity,
float angle, float angularVelocity, Color color, float size, int ttl)
{
Texture = texture;
Position = position;
Velocity = velocity;
Angle = angle;
AngularVelocity = angularVelocity;
Color = color;
Size = size;
TTL = ttl;
}
public void Update()
{
TTL--;
Position += Velocity;
Angle += AngularVelocity;
}
public void Draw(SpriteBatch spriteBatch)
{
Rectangle sourceRectangle = new Rectangle(0, 0, Texture.Width, Texture.Height);
Vector2 origin = new Vector2(Texture.Width / 2, Texture.Height / 2);
spriteBatch.Draw(Texture, Position, sourceRectangle, Color,
Angle, origin, Size, SpriteEffects.None, 0f);
}
}
}
create another new class:
and name this one ParticleEngine.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace ParticleEngine2D
{
public class ParticleEngine
{
private Random random;
public Vector2 EmitterLocation { get; set; }
private List<Particle> particles;
private List<Texture2D> textures;
public ParticleEngine(List<Texture2D> textures, Vector2 location)
{
EmitterLocation = location;
this.textures = textures;
this.particles = new List<Particle>();
random = new Random();
}
public void Update()
{
int total = 10;
for (int i = 0; i < total; i++)
{
particles.Add(GenerateNewParticle());
}
for (int particle = 0; particle < particles.Count; particle++)
{
particles[particle].Update();
if (particles[particle].TTL <= 0)
{
particles.RemoveAt(particle);
particle--;
}
}
}
private Particle GenerateNewParticle()
{
Texture2D texture = textures[random.Next(textures.Count)];
Vector2 position = EmitterLocation;
Vector2 velocity = new Vector2(
1f * (float)(random.NextDouble() * 2 - 1),
1f * (float)(random.NextDouble() * 2 - 1));
float angle = 0;
float angularVelocity = 0.1f * (float)(random.NextDouble() * 2 - 1);
Color color = new Color(
(float)random.NextDouble(),
(float)random.NextDouble(),
(float)random.NextDouble());
float size = (float)random.NextDouble();
int ttl = 20 + random.Next(40);
return new Particle(texture, position, velocity, angle, angularVelocity, color, size, ttl);
}
public void Draw(SpriteBatch spriteBatch)
{
spriteBatch.Begin();
for (int index = 0; index < particles.Count; index++)
{
particles[index].Draw(spriteBatch);
}
spriteBatch.End();
}
}
}
and then get these 3 images and add them as content references
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then finally run it and you should get something like this:
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and when you move the mouse around in the screen it will look like this:
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also i think you have to rename in a file called program.cs
it will have this line of code in it:
using System;
namespace WindowsGame2
{
#if WINDOWS || XBOX
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
static void Main(string[] args)
{
using (Game1 game = new Game1())
{
game.Run();
}
}
}
#endif
}
game1 will be your project title name.
so just add
ParticleEngine2D.game1 instead of just game1 (or whatever you named your project.)
again i take no credit for this but it is really awesome. the guy has more tutorials on xna and stuff at this website.
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so anyways yeah. enjoy.
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