/// <summary>
/// Calculates the distance squared from this vector to another.
/// </summary>
/// <param name="point">the second <see cref="Vector3" /></param>
/// <returns>the distance squared between the vectors</returns>
public float DistanceSquared(ref Vector3D point)
{
float x = point.X - X;
float y = point.Y - Y;
float z = point.Z - Z;
return ((x * x) + (y * y)) + (z * z);
}
public static Vector3D VectorRotateZ(Vector3D v, float radians)
{
float cosRad = (float)Math.Cos(radians);
float sinRad = (float)Math.Sin(radians);
return new Vector3D(v.X * cosRad - v.Y * sinRad,
v.X * sinRad + v.Y * cosRad,
v.Z);
}
public Vector3D(Vector3D vector)
{
this.X = vector.X;
this.Y = vector.Y;
this.Z = vector.Z;
}
public static Vector3D TranslateDirection2D(Vector3D source, Vector3D destination, Vector3D point, float amount)
{
Vector3D norm = Normalize(new Vector3D(destination.X - source.X, destination.Y - source.Y, 0f));
return new Vector3D(point.X + norm.X * amount,
point.Y + norm.Y * amount,
point.Z);
}
public static Vector3D Normalize(Vector3D v)
{
float mag = v.X * v.X + v.Y * v.Y + v.Z * v.Z;
if (mag == 0)
return new Vector3D(0, 0, 0);
Vector3D r = new Vector3D(v);
float len = 1f / (float)Math.Sqrt(mag);
r.X *= len;
r.Y *= len;
r.Z *= len;
return r;
}
public static Vector3D[] GenerateSpreadPositions(Vector3D center, Vector3D targetPosition, float spacingDegrees, int count)
{
Vector3D baseRotation = targetPosition - center;
float spacing = spacingDegrees * DegreesToRadians;
float median = count % 2 == 0 ? spacing * (count + 1) / 2.0f : spacing * (float)Math.Ceiling(count / 2.0f);
Vector3D[] output = new Vector3D[count];
float offset = 1f;
for (int i = 0; i < count; ++i)
{
output[i] = center + VectorRotateZ(baseRotation, offset * spacing - median);
offset += 1f;
}
return output;
}
public static float Distance2D(Vector3D a, Vector3D b)
{
return (float)Math.Sqrt(Math.Pow(a.X - b.X, 2) +
Math.Pow(a.Y - b.Y, 2));
}
private void Move(float _velocity)
{
var nextpath = path.Last();
Vector3D dest = new Vector3D(nextpath.X, nextpath.Y,0);
Vector3D ourloc = new Vector3D(WorldX, WorldY,0);
Vector3D movepos = PowerMath.TranslateDirection2D(ourloc, dest, ourloc, this._velocity);
if (this.WorldX < nextpath.X)
{
//WorldX += _velocity;
Direction = 2;
}
else if (this.WorldX > nextpath.X)
{
//WorldX -= _velocity;
Direction = 1;
}
else if (this.WorldY < nextpath.Y)
{
//WorldY += _velocity;
Direction = 0;
}
WorldX = movepos.X;
WorldY = movepos.Y;
if (GetDistance(WorldX, WorldY, nextpath.X, nextpath.Y) < 0.3f)
path.RemoveAt(path.Count - 1);
else if(new System.Drawing.Rectangle(nextpath.X,nextpath.Y,1,1).Contains((int)WorldX,(int)WorldY))
path.RemoveAt(path.Count - 1);
this.ScreenSprite = new SharpDX.RectangleF(ViewX, ViewY, ViewX + Width, ViewY + Height);
}