axiosengine/axios/ScreenSystem/MenuButton.cs

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C#
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2012-03-19 23:57:59 +00:00
using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace FarseerPhysics.SamplesFramework
{
/// <summary>
/// Helper class represents a single entry in a MenuScreen. By default this
/// just draws the entry text string, but it can be customized to display menu
/// entries in different ways. This also provides an event that will be raised
/// when the menu entry is selected.
/// </summary>
public sealed class MenuButton
{
private Vector2 _baseOrigin;
private bool _flip;
private bool _hover;
/// <summary>
/// The position at which the entry is drawn. This is set by the MenuScreen
/// each frame in Update.
/// </summary>
private Vector2 _position;
private float _scale;
private GameScreen _screen;
/// <summary>
/// Tracks a fading selection effect on the entry.
/// </summary>
/// <remarks>
/// The entries transition out of the selection effect when they are deselected.
/// </remarks>
private float _selectionFade;
private Texture2D _sprite;
/// <summary>
/// Constructs a new menu entry with the specified text.
/// </summary>
public MenuButton(Texture2D sprite, bool flip, Vector2 position, GameScreen screen)
{
_screen = screen;
_scale = 1f;
_sprite = sprite;
_baseOrigin = new Vector2(_sprite.Width / 2f, _sprite.Height / 2f);
_hover = false;
_flip = flip;
Position = position;
}
/// <summary>
/// Gets or sets the position at which to draw this menu entry.
/// </summary>
public Vector2 Position
{
get { return _position; }
set { _position = value; }
}
public bool Hover
{
get { return _hover; }
set { _hover = value; }
}
public GameScreen Screen
{
get { return _screen; }
}
/// <summary>
/// Updates the menu entry.
/// </summary>
public void Update(GameTime gameTime)
{
float fadeSpeed = (float)gameTime.ElapsedGameTime.TotalSeconds * 4;
if (_hover)
{
_selectionFade = Math.Min(_selectionFade + fadeSpeed, 1f);
}
else
{
_selectionFade = Math.Max(_selectionFade - fadeSpeed, 0f);
}
_scale = 1f + 0.1f * _selectionFade;
}
public void Collide(Vector2 position)
{
Rectangle collisonBox = new Rectangle((int)(Position.X - _sprite.Width / 2f),
(int)(Position.Y - _sprite.Height / 2f),
(_sprite.Width),
(_sprite.Height));
if (collisonBox.Contains((int)position.X, (int)position.Y))
{
_hover = true;
}
else
{
_hover = false;
}
}
/// <summary>
/// Draws the menu entry. This can be overridden to customize the appearance.
/// </summary>
public void Draw()
{
SpriteBatch batch = _screen.ScreenManager.SpriteBatch;
Color color = Color.Lerp(Color.White, new Color(255, 210, 0), _selectionFade);
batch.Draw(_sprite, _position - _baseOrigin * _scale, null, color, 0f, Vector2.Zero,
_scale, _flip ? SpriteEffects.FlipVertically : SpriteEffects.None, 0f);
}
}
}