public void mediumMissileExplosion(Vector3 position, Vector3 velocity)
{
//explosion effect
for (int i = 0; i < 35; i++)
{
mediumMissileParticles.AddParticle(position, velocity);
}
//smoke for after
for (int i = 0; i < 5; i++)
{
smallExplosionSmokeParticles.AddParticle(position, velocity);
}
}
//update fire effect
public void UpdateFire()
{
const int fireParticlePerFrame = 20;
//create a number of fire particles, randomly around circle
for (int i = 0; i < fireParticlePerFrame; i++)
{
fireParticles.AddParticle(RandomPointOnCircle(), Vector3.Zero);
}
//create one smoke particle per frame
//smokePlumeParticles.AddParticle(RandomPointOnCircle(), Vector3.Zero);
}
public void smallBulletExplosion(Vector3 position, Vector3 velocity)
{
//explosion effect
for (int i = 0; i < 30; i++)
{
smallExplosionParticles.AddParticle(position, velocity);
}
//smoke for after
for (int i = 0; i < 5; i++)
{
smallExplosionSmokeParticles.AddParticle(position, velocity);
}
}
public void ObjectDestroyedExplosion(Vector3 position, Vector3 velocity)
{
//explosion effect
for (int i = 0; i < 35; i++)
{
explosionParticles.AddParticle(position, velocity);
}
//smoke for after
for (int i = 0; i < 5; i++)
{
explosionSmokeParticles.AddParticle(position, velocity);
}
}
/// <summary>
/// Updates the emitter, creating the appropriate number of particles
/// in the appropriate positions.
/// </summary>
public void Update(GameTime gameTime, Vector3 newPosition)
{
if (gameTime == null)
{
throw new ArgumentNullException("gameTime");
}
// Work out how much time has passed since the previous update.
float elapsedTime = (float)gameTime.ElapsedGameTime.TotalSeconds;
if (elapsedTime > 0)
{
// Work out how fast we are moving.
Vector3 velocity = (newPosition - previousPosition) / elapsedTime;
// If we had any time left over that we didn't use during the
// previous update, add that to the current elapsed time.
float timeToSpend = timeLeftOver + elapsedTime;
// Counter for looping over the time interval.
float currentTime = -timeLeftOver;
// Create particles as long as we have a big enough time interval.
while (timeToSpend > timeBetweenParticles)
{
currentTime += timeBetweenParticles;
timeToSpend -= timeBetweenParticles;
// Work out the optimal position for this particle. This will produce
// evenly spaced particles regardless of the object speed, particle
// creation frequency, or game update rate.
float mu = currentTime / elapsedTime;
Vector3 position = Vector3.Lerp(previousPosition, newPosition, mu);
// Create the particle.
particleSystem.AddParticle(position, velocity);
}
// Store any time we didn't use, so it can be part of the next update.
timeLeftOver = timeToSpend;
}
previousPosition = newPosition;
}
