public void AffectRotation(ParticleForce force, float ratio, CPos origin)
{
var random = ParticleUtils.Random;
var angle = Angle.Cast((origin - Position).FlatAngle - Rotation.CastToAngleRange().Z);
var zFloat = 0f;
switch (force.Type)
{
case ParticleForceType.FORCE:
zFloat = Math.Sign(-angle) * force.Strength * ratio * 0.1f;
zFloat = Math.Min(0.628f, zFloat);
break;
case ParticleForceType.TURBULENCE:
angle = Angle.RandomAngle(random);
zFloat = Math.Sign(-angle) * force.Strength * ratio * 0.1f;
zFloat = Math.Min(0.628f, zFloat);
break;
case ParticleForceType.DRAG:
zFloat = -force.Strength * ratio * rotate_velocity.Z * 0.1f;
if (Math.Abs(zFloat) > Math.Abs(rotate_velocity.Z))
{
zFloat = -rotate_velocity.Z * ratio;
}
break;
case ParticleForceType.VORTEX:
zFloat = Math.Sign(-angle - MathF.PI / 2) * force.Strength * 0.1f;
zFloat = Math.Min(0.628f, zFloat);
break;
}
rotate_velocity = new VAngle(0, 0, zFloat);
}
public void AffectVelocity(ParticleForce force, float ratio, CPos origin, int originHeight)
{
var random = ParticleUtils.Random;
var useZ = force.UseHeight && Height != originHeight;
var zinvert = Height > originHeight;
var angle = (Position - origin).FlatAngle;
var xFloat = 0f;
var yFloat = 0f;
var zFloat = 0f;
switch (force.Type)
{
case ParticleForceType.FORCE:
xFloat = (force.Strength * MathF.Cos(angle)) * ratio;
yFloat = (force.Strength * MathF.Sin(angle)) * ratio;
if (useZ)
{
zFloat = (zinvert ? -1 : 1) * force.Strength * ratio;
}
break;
case ParticleForceType.TURBULENCE:
angle = Angle.RandomAngle(random);
xFloat = (force.Strength * MathF.Cos(angle)) * ratio;
yFloat = (force.Strength * MathF.Sin(angle)) * ratio;
if (useZ)
{
zFloat = (zinvert ? -1 : 1) * ((float)random.NextDouble() - 0.5f) * force.Strength * ratio;
}
break;
case ParticleForceType.DRAG:
xFloat = -force.Strength * ratio * velocity.X / 256;
if (Math.Abs(xFloat) > Math.Abs(velocity.X))
{
xFloat = -velocity.X * ratio;
}
yFloat = -force.Strength * ratio * velocity.Y / 256;
if (Math.Abs(yFloat) > Math.Abs(velocity.Y))
{
yFloat = -velocity.Y * ratio;
}
if (useZ)
{
zFloat = force.Strength * ratio * velocity.Z / 256;
if (Math.Abs(zFloat) > Math.Abs(velocity.Z))
{
zFloat = -velocity.Z * ratio;
}
}
break;
case ParticleForceType.VORTEX:
angle -= MathF.PI / 2; // Rotate 90°
xFloat = (force.Strength * MathF.Cos(angle)) * ratio;
yFloat = (force.Strength * MathF.Sin(angle)) * ratio;
zFloat = 0; // Vortex is only 2D
break;
}
xFloat += velocity_left.X;
yFloat += velocity_left.Y;
zFloat += velocity_left.Z;
var x = (int)Math.Round(xFloat);
var y = (int)Math.Round(yFloat);
var z = (int)Math.Round(zFloat);
velocity_left = new Vector(xFloat - x, yFloat - y, zFloat - z);
velocity += new CPos(x, y, z);
}