我是C＃和XNA的新手。我目前正在开发游戏的选项菜单。选项菜单执行以下操作：
我在互联网上找到了一些处理亮度的代码，但它是使用Game.cs类实现的。我试图在我的OptionsMenuScreen.cs类（继承自Gamescreen.cs）中使用该代码。
我遇到的问题是我的名为BrightnessSelected的EventHandler超载了一些额外的参数来处理触摸输入，以便用户可以使屏幕变亮/变暗。这种重载导致了一些问题，因为它基于System.EventHandler中提供的模板，该模板只接受一个参数。
如何让模板允许我超载？或者还有另外一个吗？我真的希望这是有道理的，并且我以非复杂的方式表达了我的问题。感谢大家！
代码如下：
#region Using Statements
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Content;
using Microsoft.Xna.Framework.GamerServices;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Input.Touch;
using Microsoft.Xna.Framework.Media;
#endregion
namespace Platformer
{
/// <summary>
/// The options screen is brought up over the top of the main menu
/// screen, and gives the user a chance to configure the game
/// in various hopefully useful ways.
/// </summary>
class OptionsMenuScreen : MenuScreen
{
#region Fields
GraphicsDevice graphicsDevice;
SpriteBatch spriteBatch;
Texture2D whiteTexture;
int brightnessStart;
int contrastStart;
BlendState brightnessBlend;
BlendState contrastBlend;
MenuEntry sound1;
MenuEntry brightness;
MenuEntry scoreboard;
MenuEntry controls;
static bool soundonoff = true;
#endregion
#region Initialization
/// <summary>
/// Constructor.
/// </summary>
public OptionsMenuScreen()
: base("Options")
{
// Create our menu entries.
sound1 = new MenuEntry(string.Empty);
brightness = new MenuEntry(string.Empty);
scoreboard = new MenuEntry(string.Empty);
controls = new MenuEntry(string.Empty);
SetMenuEntryText();
// Hook up menu event handlers.
brightness.Selected += brightnessSelected;
sound1.Selected += sound1Selected;
scoreboard.Selected += scoreboardSelected;
controls.Selected += controlsSelected;
// Add entries to the menu.
MenuEntries.Add(sound1);
MenuEntries.Add(brightness);
MenuEntries.Add(controls);
MenuEntries.Add(scoreboard);
}
protected void Initialize()
{
// TODO: Add your initialization logic here
brightnessStart = 255;
contrastStart = 128;
brightnessBlend = new BlendState();
brightnessBlend.ColorSourceBlend = brightnessBlend.AlphaSourceBlend = Blend.Zero;
brightnessBlend.ColorDestinationBlend = brightnessBlend.AlphaDestinationBlend
= Blend.SourceColor;
contrastBlend = new BlendState();
contrastBlend.ColorSourceBlend = contrastBlend.AlphaSourceBlend = Blend.DestinationColor;
contrastBlend.ColorDestinationBlend = contrastBlend.AlphaDestinationBlend = `Blend.SourceColor;`
}
public virtual void LoadContent()
{
whiteTexture = new Texture2D(graphicsDevice, 1, 1);
whiteTexture.SetData<Color>(new Color[] { Color.White });
// Create a new SpriteBatch, which can be used to draw textures.
spriteBatch = new SpriteBatch(graphicsDevice);
}
public virtual void Draw(GameTime gameTime)
{
graphicsDevice.Clear(Color.CornflowerBlue);
// TODO: Add your drawing code here
spriteBatch.Begin(SpriteSortMode.Immediate, brightnessBlend);
spriteBatch.Draw(whiteTexture, new Rectangle(0, 0, 480, 800), new Color(brightnessStart, `brightnessStart, brightnessStart, 255));`
spriteBatch.End();
spriteBatch.Begin(SpriteSortMode.Immediate, contrastBlend);
spriteBatch.Draw(whiteTexture, new Rectangle(0, 0, 480, 800), new Color(contrastStart, `contrastStart, contrastStart, 255));`
spriteBatch.End();
graphicsDevice.BlendState = BlendState.Opaque;
base.Draw(gameTime);
}
/// <summary>
/// Fills in the latest values for the options screen menu text.
/// </summary>
void SetMenuEntryText()
{
sound1.Text = "Sound " + (soundonoff ? "on" : "off");
brightness.Text = "Brightness ";
scoreboard.Text = "Scoreboard ";
controls.Text = "Controls ";
}
#endregion
#region Handle Input
/// <summary>
/// Event handler for when the Sound menu entry is selected.
/// </summary>
///
protected void Update(GameTime gameTime)
{
foreach (TouchLocation t in TouchPanel.GetState())
{
if ((t.State == TouchLocationState.Pressed)
|| (t.State == TouchLocationState.Moved))
{
if (t.Position.Y <= 400)
brightnessSelected(t, ref brightnessStart);
}
else
brightnessSelected(t, ref contrastStart);
}
}
void sound1Selected(object sender, PlayerIndexEventArgs e)
{
soundonoff = !soundonoff;
SetMenuEntryText();
}
/// <summary>
/// Event handler for when the Brightness menu entry is selected.
/// </summary>
void brightnessSelected(object sender, PlayerIndexEventArgs e, TouchLocation t, ref int adjustee)
{
if (t.Position.X < 240)
adjustee -= 3;
else
adjustee += 3;
adjustee = Math.Max(Math.Min(adjustee, 255), 0);
SetMenuEntryText();
}
/// <summary>
/// Event handler for when the Scoreboard menu entry is selected.
/// </summary>
void scoreboardSelected(object sender, PlayerIndexEventArgs e)
{
//need to find a way to transition to HighScoreScreen.cs here
//ScreenManager.AddScreen(new HighScoreScreen(), e.PlayerIndex);
SetMenuEntryText();
}
/// <summary>
/// Event handler for when the Control menu entry is selected.
/// </summary>
void controlsSelected(object sender, PlayerIndexEventArgs e)
{
//ScreenManager.AddScreen(new ControlScreen(), e.PlayerIndex);
SetMenuEntryText();
}
#endregion
}
}
答案 0 :(得分：2)
您无法将ref int adjustee传递给事件处理程序，并期望将其值返回给被调用者。事件处理程序就是这样。可以把它想象成一个可以响应事件的回调。
接下来，您需要将EventArgs子类化并将自己的数据添加到其中，如下所示。
public class MyEventArgs : EventArgs
{
private string msg;
public MyEventArgs( string messageData )
{
msg = messageData;
}
public string Message {
get { return msg; }
set { msg = value; }
}
}
请参阅有关处理程序和参数的文章：http://msdn.microsoft.com/en-us/library/db0etb8x.aspx
在您的情况下，您需要访问MenuEntry的代码并编辑它传递的TEventArgs类型（在这种情况下，它使用PlayerIndexEventArgs）。您可以再次继承PlayerIndexEventArgs，或者只是将其重新定义为您自己的类型。我不知道XNA课程是什么，如果没有意义，你可能需要再次考虑设计。
当你完成后，你应该有类似
的东西int _brightness;
void brightnessSelectedEventHandler(object sender, BrightnessEventArgs e)
{
if (e.touch != null && e.touch.position != null)
{
const int TOUCH_POS_THRESHOLD = 240; // this is part of UI and should really be somewhere else, but put it here for convenience
if (e.touch.position.x < TOUCH_POS_THRESHOLD
adjustBrightness(-3);
else
adjustBrightness(3);
}
SetMenuEntryText();
}
void adjustBrightness(int offset)
{
_brightness += offset;
}
请注意，这里我只是在您的类中添加一个成员变量_brightness。这就是你如何“回应”事件 - 在某处放置一些数据或调整一个值。您需要考虑数据的位置以及应从OO角度对其进行封装的位置。
祝你好运。