public UniformMotionSprite(
Surface surface, Point2 startLocation, Vector2F velocity,
float totalTime)
: this(new StaticAnimation(surface), startLocation,
startLocation + (Vector2)(velocity * totalTime),
totalTime)
{
}
public Vector2F Rotate90(Vector2F pivot)
{
return Add(-pivot)
.Rotate90()
.Add(pivot);
}
/// <summary>
/// 内積を求める。
/// </summary>
/// <param name="v"> </param>
/// <returns> </returns>
public float InnerProduct(Vector2F v)
{
return X * v.X + Y * v.Y;
}
public bool Equals(Vector2F v)
{
return v.X == X && v.Y == Y;
}
/// <summary>
/// 外積のZ成分（X, Y成分は0）を求める。
/// </summary>
/// <param name="v"> </param>
/// <returns> </returns>
public float CrossProduct(Vector2F v)
{
return X * v.Y - Y * v.X;
}
public Vector2F Add(Vector2F dv)
{
return new Vector2F(X + dv.X, Y + dv.Y);
}
public UniformMotionSprite(
AnimationSurface animationSurface, Point2 startLocation,
Vector2F velocity, float totalTime)
: this(animationSurface, startLocation,
startLocation + (Vector2)(velocity * totalTime),
totalTime)
{
}
public Point2F Rotate270(Vector2F pivot)
{
return Add(-pivot)
.Rotate270()
.Add(pivot);
}
public Point2F Add(Vector2F dv)
{
return new Point2F(X + dv.X, Y + dv.Y);
}