private bool CollidesWithBlackHole(PhysicalObject po)
{
foreach (BlackHole bh in model.BlackHoleList)
{
if (Vector2.Distance(bh.Position, po.Position) <= bh.DisappearanceRadius)
{
return(true);
}
}
return(false);
}
private Planet CollidesWithPlanet(PhysicalObject po)
{
foreach (Planet planet in model.PlanetList)
{
if (Vector2.Distance(po.Position, planet.Position) < planet.Radius)
{
return(planet);
}
}
return(null);
}
/// <summary>
/// Returns a Vector2 showing the gravitational pull of GravityPoint gp on PhysicalObject po
/// </summary>
/// <param name="po">The physical object being affected.</param>
/// <param name="gp">The gravity point affecting the object.</param>
/// <returns></returns>
public static Vector2 CalculateGravity(PhysicalObject po, GravityPoint gp)
{
Vector2 delta = gp.Position - po.Position;
float r = delta.Length();
float gravPull = GravityConstant * gp.Mass / (r * r);
float theta = (float)Math.Atan2(delta.Y, delta.X);
Vector2 result = new Vector2();
result.X = gravPull * (float)Math.Cos(theta);
result.Y = gravPull * (float)Math.Sin(theta);
return(result);
}
public static bool CollidesWithBottomBorder(PhysicalObject p, Terrain terrain)
{
if (GravityField.Y > 0 && GravityField.Y > GravityField.X) //gravity pointing down
{
return(p.BoundingBox.Bottom >= terrain.Height);
}
else if (GravityField.Y < 0 && GravityField.Y < GravityField.X) //Gravity pointing up
{
return(p.BoundingBox.Top < 0);
}
else if (GravityField.X > 0 && GravityField.X > GravityField.Y) //Gravity pointing right
{
return(p.BoundingBox.Right >= terrain.Width);
}
else if (GravityField.X < 0 && GravityField.X < GravityField.Y) //gravity pointing left
{
return(p.BoundingBox.Left < 0);
}
else
{
return(false);
}
}
private bool CollidesWithTerrain(PhysicalObject po)
{
return(IntersectPixels(po.WorldTransform, po.SourceRect.Width, po.SourceRect.Height, po.ColorData, model.Terrain));
}
private bool CollidesWithBorders(PhysicalObject po)
{
return(!new Rectangle(0, 0, model.Terrain.Width, model.Terrain.Height).Contains(po.BoundingBox));
}
