XNA 4 Express Studio中的宽度和高度问题 [英] Width and height problem in XNA 4 Express Studio

问题描述

我正在尝试创建XNA迷宫游戏，但是一开始我就遇到了问题.这是我的更新方法:

I''m trying to create a XNA maze game, but at the very beginning, I got a problem. Here''s my Update method:

if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Escape))
    this.Exit();
if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Left))
    ballPosition.X -= ballSpeed;
if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Right))
    ballPosition.X += ballSpeed;
if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Down))
    ballPosition.Y += ballSpeed;
if (Keyboard.GetState(PlayerIndex.One).IsKeyDown(Keys.Up))
    ballPosition.Y -= ballSpeed;
if (ballPosition.X >= width)
    ballPosition.X = width;
if (ballPosition.X <= 0)
    ballPosition.X = 0;
if (ballPosition.Y >= height)
    ballPosition.Y = height;
if (ballPosition.Y <= 0)
    ballPosition.Y = 0;
base.Update(gameTime);

但是，当我运行游戏时，球不会在x = 0或y = 0时熄灭，但是在其他时候，它不在我的游戏屏幕之外.
P. S.的宽度和高度是在Initialize方法中使用ballPosition默认值指定的:

But, when I run the game, ball won''t go out at x=0 or y=0, but at other points it goes out of my game screen.
P. S. width and height are specified in Initialize method with ballPosition default values:

width = graphics.GraphicsDevice.Viewport.Width;
height = graphics.GraphicsDevice.Viewport.Height;
ballPosition.X = width / 2;
ballPosition.Y = height / 2;

推荐答案

球离开屏幕的原因是球速可以大于1，因为这样，您必须检查球的当前位置和球速是否超出屏幕并进行处理(通过将其位置设置为宽度)

The reason the ball is going out of the screen is that the ball speed can be more then 1 as such you must check if the current position of the ball plus the ball speed goes out of screen and handle it (by setting its postion to width)

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