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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.Graphics;
using V3.Objects.Sprite;
namespace V3.Objects
{
public sealed class Arrow
{
//Drawing an arrow
private const int SpeedModifier = 10;
private readonly ArrowSprite mArrow;
private Vector2 mArrowPosition;
private Vector2 mArrowGoal;
private Vector2 mDirection;
private bool mArrowDraw;
private readonly MovementDirection mMovementDirection;
public Arrow(Vector2 start, Vector2 goal)
{
mArrowPosition = start;
mArrowGoal = goal;
mDirection = goal - start;
mDirection.Normalize();
mMovementDirection = GiveMovementDirection(mDirection);
mArrow = new ArrowSprite();
mArrowDraw = true;
}
public void LoadArrow(ContentManager contentManager)
{
mArrow.Load(contentManager);
}
public void DrawArrow(SpriteBatch spriteBatch)
{
if (mArrowDraw)
mArrow.Draw(spriteBatch, mArrowPosition, MovementState.Idle, mMovementDirection);
}
/// <summary>
/// The moving for arrow
/// </summary>
public void UpdateArrow()
{
if (mArrowDraw)
mArrowPosition += mDirection * SpeedModifier;
if (Vector2.Distance(mArrowPosition, mArrowGoal) < 1f * SpeedModifier)
mArrowDraw = false;
}
/// <summary>
/// Calculates the direction the creature is looking when moving.
/// Method copied from PlayerMovement class.
/// </summary>
private MovementDirection GiveMovementDirection(Vector2 direction)
{
// |\
// |α\ α == 22.5°
// b| \ 1 β == 67.5°
// | β\
// ──────
// a
const float b = 0.92f; // b == sin β
const float a = 0.38f; // a == sin α
MovementDirection movementDirection;
if (direction.X < -b)
{
movementDirection = MovementDirection.W;
}
else if (direction.X > b)
{
movementDirection = MovementDirection.O;
}
else if (direction.Y > 0)
{
if (direction.X < -a)
{
movementDirection = MovementDirection.SW;
}
else if (direction.X > a)
{
movementDirection = MovementDirection.SO;
}
else
{
movementDirection = MovementDirection.S;
}
}
else
{
if (direction.X < -a)
{
movementDirection = MovementDirection.NW;
}
else if (direction.X > a)
{
movementDirection = MovementDirection.NO;
}
else
{
movementDirection = MovementDirection.N;
}
}
return movementDirection;
}
}
}
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