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