/// <summary>
/// When overridden in the derived class, generates the offset and normalized force vectors to
/// release the <see cref="Particle"/> at.
/// </summary>
/// <param name="particle">The <see cref="Particle"/> that the values are being generated for.</param>
/// <param name="offset">The offset vector.</param>
/// <param name="force">The normalized force vector.</param>
protected override void GenerateParticleOffsetAndForce(Particle particle, out Vector2 offset, out Vector2 force)
{
var hw = Width * 0.5f;
var hh = Height * 0.5f;
// Get the offset
if (Perimeter)
{
if (RandomHelper.NextBool())
{
offset = new Vector2(RandomHelper.Choose(-hw, hw), RandomHelper.NextFloat(-hh, hh));
}
else
{
offset = new Vector2(RandomHelper.NextFloat(-hw, hw), RandomHelper.Choose(-hh, hh));
}
}
else
{
offset = new Vector2(RandomHelper.NextFloat(-hw, hw), RandomHelper.NextFloat(-hh, hh));
}
// Get the force
var radians = RandomHelper.NextFloat(MathHelper.TwoPi);
force = new Vector2((float)Math.Sin(radians), (float)Math.Cos(radians));
}
public void Choose2Test()
{
for (var i = 0; i < 10; i++)
{
var selected = RandomHelper.Choose(1, 2);
Assert.IsTrue(selected == 1 || selected == 2);
}
}
public void Choose6Test()
{
for (var i = 0; i < 10; i++)
{
var selected = RandomHelper.Choose(1, 2, 3, 4, 5, 6);
Assert.IsTrue(selected >= 1 && selected <= 6);
}
}
public void Choose1Test()
{
var selected = RandomHelper.Choose(1);
Assert.AreEqual(1, selected);
}