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   源码介绍

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c#做的喷泉效果

using System;
using System.Drawing;

namespace Particles
{
/// <summary>
/// Summary description for Firework.
/// </summary>
public class PSExplosion : ParticlesSystem
{
private static readonly int DEFAULT_NUM_PARTICLES = 150;

// Random numbers generator
private Random m_rand = new Random();

/// <summary>
/// Default constructor
/// </summary>
public PSExplosion() : this(Vector.Zero, Color.Black)
{ }

/// <summary>
/// Constructor
/// </summary>
/// <param name="pos">Starting position of system</param>
public PSExplosion(Vector pos) : this(Vector.Zero, Color.Black)
{ }

/// <summary>
/// Constructor
/// </summary>
/// <param name="pos">Starting position of system</param>
/// <param name="col">Color of the particles in the system</param>
public PSExplosion(Vector pos, Color col)
{
// Set system's position at given position
m_Position = pos;
// Set system color to given color
m_Color = col;
// Create all the particles in the system
for (int i = 0; i < DEFAULT_NUM_PARTICLES; i )
{
// Create particle, and add it to the list of particles
m_Particles.Add(GenerateParticle());
}
}

/// <summary>
/// Update all the particles in the system
/// </summary>
/// <returns>False - if there are no more particles in system
/// True - otherwise</returns>
public override bool Update()
{
Particle part;
// Get number of particles in the system
int count = m_Particles.Count;

// For each particle
for (int i=0; i<count; i )
{
// Get particle from list
part = (Particle)m_Particles[i];
// Update particle and check age
part.Update();
if (part.Life > particleMaxLife)
{
// Remove old particles
m_Particles.RemoveAt(i);
// Update counter and index
i--;
count = m_Particles.Count;
}
}
// If there are no more particles in the system
if (m_Particles.Count <= 0)
return false;
return true;
}

/// <summary>
/// Generate a single particle in the system.
/// This function is used when particles are first created, and when they are regenerated
/// </summary>
/// <returns>New particle</returns>
protected override Particle GenerateParticle()
{
// Generate random direction & speed for new particle
float rndX = 2 * ((float)m_rand.NextDouble() - 0.5f);
float rndY = 2 * ((float)m_rand.NextDouble() - 0.5f);
float rndZ = 2 * ((float)m_rand.NextDouble() - 0.5f);

// Create new particle at system's starting position
Particle part = new Particle(m_Position,
// With generated direction and speed
new Vector(rndX, rndY, rndZ), m_Color,
// And a random starting life
m_rand.Next(50));

// Return newly created particle
return part;
}
}
}