public void Emit()
{
var p = new Particle(.8f, .5f, ttl);
p.Position = this.Position;
p.Velocity = this.Target * this.Velocity;
pe.AddSpirit(p);
}
public FlameBall(Vector2 pos, Vector2 vel, float maxAge)
{
PolyBody = new Particle(.8f, .5f, maxAge);
PolyBody.Position = pos;
PolyBody.Velocity = vel;
PolyBody.Deleted += new PhysicsEventHandler(p_Deleted);
Scale = 1f;
PolyBody.Rotation = ((float)(new Random()).NextDouble()) * 2f * (float)Math.PI;
Load();
}
public static bool TestCollisionPartiPoly(Particle p, PolyBody bod, out Vector2 axis, out float disp)
{
axis = new Vector2();
disp = float.MinValue;
var norms = bod.GetNormals().ToList();
Vector2 closeV = Vector2.Zero;
var verts = bod.GetTransformedVertices();
float min = float.MaxValue;
foreach (var v in verts)
{
var d = (p.Position - v).LengthSquared();
if (d < min)
{
d = min;
closeV = v;
}
}
if (closeV != Vector2.Zero && p.Position - closeV != Vector2.Zero)
{
var pNorm = Vector2.Normalize(p.Position - closeV);
norms.Add(pNorm);
}
//
//Col test
//
foreach (Vector2 ax in norms)
{
float d = Projection.IntervalDist(p.Project(ax), bod.Project(ax));
if (d > 0) //no collision if even 1 separating axis found
{
disp = 0;
return false;
}
else if (d > disp) //return disp w/ lowset overlap (ie: highest separation)
{
disp = d;
axis = ax;
}
}
if (Vector2.Dot(p.Position - bod.Position, axis) < 0) //make sure the normal always points from p->bod. (should this use .GetCentroid() instead of position?)
axis = -axis;
return true;
}
