当你点击最顶部的按钮时，它假设在屏幕上绘制一个字符串，但它没有显示出来。我移动了mainMenu.UpdateButtons（）;到Main.cs中的Draw方法但绘制了字符串，然后再次绘制背景图像。使其显示为字符串瞬间显示并消失。为什么要这样做？
Main.cs
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.Media;
using TestGame.Controls;
using TestGame.GameStates;
namespace TestGame
{
public class Main : Microsoft.Xna.Framework.Game
{
GraphicsDeviceManager graphics;
InputHandler inputHandler;
public SpriteBatch spriteBatch;
public SpriteFont spriteFont;
MainMenu mainMenu;
Vector2 position;
public Main()
{
graphics = new GraphicsDeviceManager(this);
Content.RootDirectory = "Content";
inputHandler = new InputHandler();
mainMenu = new MainMenu(this);
graphics.PreferredBackBufferWidth = 1280;
graphics.PreferredBackBufferHeight = 720;
}
protected override void Initialize()
{
this.IsMouseVisible = true;
base.Initialize();
mainMenu.MenuInitialize();
}
protected override void LoadContent()
{
spriteBatch = new SpriteBatch(GraphicsDevice);
spriteFont = Content.Load<SpriteFont>(@"Fonts\MainFont");
mainMenu.MenuLoadContent();
}
protected override void UnloadContent()
{
}
protected override void Update(GameTime gameTime)
{
inputHandler.Update();
if (inputHandler.currentKeyState.IsKeyDown(Keys.Escape))
this.Exit();
mainMenu.frameTime = gameTime.ElapsedGameTime.Milliseconds / 1000;
MouseState mouseState = Mouse.GetState();
mainMenu.mouseX = mouseState.X;
mainMenu.mouseY = mouseState.Y;
mainMenu.previouslyPressed = mainMenu.mousePressed;
mainMenu.mousePressed = mouseState.LeftButton == ButtonState.Pressed;
mainMenu.UpdateButtons();
base.Update(gameTime);
}
protected override void Draw(GameTime gameTime)
{
GraphicsDevice.Clear(Color.Black);
spriteBatch.Begin();
mainMenu.MenuDraw();
spriteBatch.End();
base.Draw(gameTime);
}
}
}
MainMenu.cs
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
namespace TestGame.GameStates
{
public class MainMenu
{
enum buttonState { hover, up, released, down }
const int numberOfButtons = 4, newGameButtonIndex = 0, loadGameButtonIndex = 1, optionsButtonIndex = 2, quitButtonIndex = 3, buttonHeight = 48, buttonWidth = 80;
Color[] buttonColor = new Color[numberOfButtons];
Rectangle[] buttonRect = new Rectangle[numberOfButtons];
buttonState[] buttonSt = new buttonState[numberOfButtons];
Texture2D[] buttonTexture = new Texture2D[numberOfButtons];
double[] buttonTimer = new double[numberOfButtons];
public bool mousePressed, previouslyPressed = false;
public int mouseX, mouseY;
public double frameTime;
int buttonPadding;
Main main;
Texture2D backgroundImage;
Texture2D backgroundImageFade;
public MainMenu(Game game)
{
main = (Main)game;
}
public void MenuInitialize()
{
for (int i = 0; i < numberOfButtons; i++)
{
buttonSt[i] = buttonState.up;
buttonColor[i] = Color.White;
buttonTimer[i] = 0.0;
buttonRect[i] = new Rectangle(0, buttonPadding, buttonWidth, buttonHeight);
buttonPadding += buttonHeight;
}
}
public void MenuLoadContent()
{
backgroundImage = main.Content.Load<Texture2D>(@"Backgrounds\titlescreen");
backgroundImageFade = main.Content.Load<Texture2D>(@"Backgrounds\titlescreenfade");
buttonTexture[newGameButtonIndex] = main.Content.Load<Texture2D>(@"Sprites\desktop");
buttonTexture[loadGameButtonIndex] = main.Content.Load<Texture2D>(@"Sprites\desktop");
buttonTexture[optionsButtonIndex] = main.Content.Load<Texture2D>(@"Sprites\desktop");
buttonTexture[quitButtonIndex] = main.Content.Load<Texture2D>(@"Sprites\desktop");
}
public void MenuDraw()
{
main.spriteBatch.Draw(backgroundImage, new Vector2(0, 0), Color.White);
for (int i = 0; i < numberOfButtons; i++)
{
main.spriteBatch.Draw(buttonTexture[i], buttonRect[i], buttonColor[i]);
}
}
Boolean targetImageAlpha(Rectangle rect, Texture2D texture, int x, int y)
{
return targetImageAlpha(0, 0, texture, texture.Width * (x - rect.X) / rect.Width, texture.Height * (y - rect.Y) / rect.Height);
}
Boolean targetImageAlpha(float tx, float ty, Texture2D texture, int x, int y)
{
if (targetImage(tx, ty, texture, x, y))
{
uint[] data = new uint[texture.Width * texture.Height];
texture.GetData<uint>(data);
if ((x - (int)tx) + (y - (int)ty) * texture.Width < texture.Width * texture.Height)
{
return ((data[(x - (int)tx) + (y - (int)ty) * texture.Width] & 0xFF000000) >> 24) > 20;
}
}
return false;
}
Boolean targetImage(float tx, float ty, Texture2D texture, int x, int y)
{
return (x >= tx && x <= tx + texture.Width && y >= ty && y <= ty + texture.Height);
}
public void UpdateButtons()
{
for (int i = 0; i < numberOfButtons; i++)
{
if (targetImageAlpha(buttonRect[i], buttonTexture[i], mouseX, mouseY))
{
buttonTimer[i] = 0.0;
if (mousePressed)
{
buttonSt[i] = buttonState.down;
buttonColor[i] = Color.Blue;
}
else if (!mousePressed && previouslyPressed)
{
if (buttonSt[i] == buttonState.down)
{
buttonSt[i] = buttonState.released;
}
}
else
{
buttonSt[i] = buttonState.hover;
buttonColor[i] = Color.LightBlue;
}
}
else
{
buttonSt[i] = buttonState.up;
if (buttonTimer[i] > 0)
{
buttonTimer[i] = buttonTimer[i] - frameTime;
}
else
{
buttonColor[i] = Color.White;
}
}
if (buttonSt[i] == buttonState.released)
{
onButtonClick(i);
}
}
}
void onButtonClick(int i)
{
switch (i)
{
case newGameButtonIndex:
main.spriteBatch.Begin();
//main.spriteBatch.DrawString(main.spriteFont, "Creating new game", new Vector2(100, 200), Color.White);
main.spriteBatch.Draw(backgroundImageFade, new Vector2(0, 0), Color.White);
main.spriteBatch.End();
break;
default:
break;
}
}
}
}
答案 0 :(得分：1)
正在绘制，但随后您将在Draw方法中将其删除。当您开始将绘图代码与更新代码混合时，这就是您将遇到的问题。
所以这里有一个关于你现在游戏中发生的事情的例子。
然后点击发生，这就是发生的事情。
所以这一切都“正常”，而不是你真正的意图。您将要分离绘图代码，以便从Draw方法调用中进行绘制。基本上检查一下buttonState是否已经在Draw方法中“释放”，然后绘制你想要的文本。