一起谈.NET技术，Silverlight 2.5D RPG游戏技巧与特效处理：（九）粒子系统

/// <summary>
/// 显示风中粒子
/// </summary>
/// <param name="role"> 所修饰角色 </param>
/// <param name="equipType"> 所参照的装备 </param>
/// <param name="particleType"> 粒子类型 </param>
/// <param name="color"> 颜色 </param>
/// <param name="amount"> 量 </param>
public void ShowWindParticles(Hero role, EquipTypes equipType, ParticleTypes particleType, Color color, double amount) {
int distance = 0 ;
double speed = 0 ;
if (role.Action == Actions.Stop) {
distance = 40 ;
speed = RandomSeed.Next( 2000 , 3000 ) * 0.01 ;
} else {
distance = 40 ;
speed = RandomSeed.Next( 1000 , 1500 ) * 0.01 ;
}
int halfDistance = distance / 2 ;
int obliqueDistance = distance * 2 / 3 ;
string particleName = string .Empty;
switch (particleType) {
case ParticleTypes.Normal:
particleName = " Particle " ;
break ;
case ParticleTypes.Smoke:
particleName = " Smoke " ;
break ;
case ParticleTypes.Ice:
particleName = " Ice " ;
break ;
case ParticleTypes.Spark:
particleName = " Spark " ;
break ;
}
Dispatcher.BeginInvoke( delegate {
ObjectBase equip = role.EquipEntity(equipType);
WriteableBitmap writeableBitmap = new WriteableBitmap(equip, null );
lock (writeableBitmap) {
writeableBitmap.Invalidate();
int z = 0 ;
if (equipType == EquipTypes.Weapon) {
z = role.Z + equip.Z;
} else {
z = (role.Direction == Directions.North || role.Direction == Directions.NorthEast || role.Direction == Directions.NorthWest) ? role.Z : role.Z - 20 ;
}
Point position = equipType == EquipTypes.Overall ? role.Center : equip.Position;
Point2D destination = new Point2D();
MonoChrome monoChrome = new MonoChrome() { FilterColor = color };
switch (role.Direction) {
case Directions.North:
destination.X = 0 ; destination.Y = RandomSeed.Next(halfDistance, distance);
break ;
case Directions.NorthEast:
destination.X = - RandomSeed.Next(halfDistance, obliqueDistance); destination.Y = RandomSeed.Next(halfDistance, obliqueDistance);
break ;
case Directions.East:
destination.X = - RandomSeed.Next(halfDistance, distance); destination.Y = 0 ;
break ;
case Directions.SouthEast:
destination.X = - RandomSeed.Next(halfDistance, obliqueDistance); destination.Y = - RandomSeed.Next(halfDistance, obliqueDistance);
break ;
case Directions.South:
destination.X = 0 ; destination.Y = - RandomSeed.Next(halfDistance, distance);
break ;
case Directions.SouthWest:
destination.X = RandomSeed.Next(halfDistance, obliqueDistance); destination.Y = - RandomSeed.Next(halfDistance, obliqueDistance);
break ;
case Directions.West:
destination.X = RandomSeed.Next(halfDistance, distance); destination.Y = 0 ;
break ;
case Directions.NorthWest:
destination.X = RandomSeed.Next(halfDistance, obliqueDistance); destination.Y = RandomSeed.Next(halfDistance, obliqueDistance);
break ;
}
for ( int i = 0 ; i < amount; i ++ ) {
int x = RandomSeed.Next( 0 , writeableBitmap.PixelWidth);
int y = RandomSeed.Next( 0 , writeableBitmap.PixelHeight);
byte [] bytes = BitConverter.GetBytes(writeableBitmap.Pixels[writeableBitmap.PixelWidth * y + x]);
if (bytes[ 3 ] != 0 ) {
Particle particle = new Particle() { Effect = monoChrome, Z = z, Source = GlobalMethod.GetProjectImage( string .Format( " UI/{0}{1}.png " , particleName, RandomSeed.Next( 0 , 3 ))) };
space.Children.Add(particle);
EventHandler handler = null ;
particle.Disposed += handler = (s, e) => {
Particle p = s as Particle;
p.Disposed -= handler;
space.Children.Remove(p);
};
particle.Move( new Point(role.Position.X - position.X + x, role.Position.Y - position.Y + y), new Point(role.Position.X - position.X + x + destination.X, role.Position.Y - position.Y + y + destination.Y), speed, MoveModes.Opacity);
}
}
}
});
}