public bool CanEatBubble (Bubble b)
{
if (!b.IsEaten)
{
var r2 = (this.Center.X - b.Center.X) * (this.Center.X - b.Center.X) +
(this.Center.Y - b.Center.Y) * (this.Center.Y - b.Center.Y);
if (r2 < (this.R + b.R) * (this.R + b.R))
if (this.R > b.R)
return true;
}
return false;
}
/// <summary>
/// How this bubble eats another bubble.
/// </summary>
/// <param name="b">The blue component.</param>
public void EatBubble (Bubble b)
{
// area ratio
var Sd = b.S / this.S;
b.IsEaten = true;
// mixing colors (depending on area ratio)
this.Color = new Color (
(b.Color.R * Sd + this.Color.R * (1 - Sd)),
(b.Color.G * Sd + this.Color.G * (1 - Sd)),
(b.Color.B * Sd + this.Color.B * (1 - Sd)));
// increase radius (depending on area ratio)
this.R = Math.Sqrt ((this.S + b.S) / Math.PI);
// calculating speed (depending on area / "mass" ratio)
this.VX += b.VX * Sd;
this.VY += b.VY * Sd;
}
void InitScene (double w, double h)
{
bubbles = new Bubble[rnd.Next (20, 35)];
for (int i=0; i < bubbles.Length; i++)
{
bubbles[i] = new Bubble ()
{
R = rnd.NextDouble () * 25 + 7,
VX = rnd.NextDouble () * 2.0 - 1.0,
VY = rnd.NextDouble () * 2.0 - 1.0,
IsEaten = false,
Color = new Color
(
rnd.NextDouble (),
rnd.NextDouble (),
rnd.NextDouble (),
0.75
),
Center = new PointD (rnd.NextDouble () * w, rnd.NextDouble () * h)
};
}
}