[英]Loading an X position between classes gives a “field is never assigned to” warning
因此,我在XNA上创建了一个小游戏,目前正处于AI编码阶段。 我目前遇到的问题是,我无法加载redNinja(玩家角色)的X位置,并且无法让blueNinja(AI)读取并走向它。
每次我尝试通过redNinja.Position.X进行引用时,它都会为我提供field is never assigned to, and will always have it's default value null.
的field is never assigned to, and will always have it's default value null.
警告。
namespace Ninja_DM
{
class AI
{
Texture2D blueNinja;
Ninjas redNinja;
float timer = 0f;
float interval = 130f;
int currentFrame = 0;
int spriteSpeed = 2;
int spriteWidth = 32;
int spriteHeight = 28;
public Rectangle sourceRect;
Vector2 position_b;
Vector2 origin;
public Vector2 Position
{
get { return position_b; }
set { position_b = value; }
}
public Vector2 Origin
{
get { return origin; }
set { origin = value; }
}
public Texture2D Texture
{
get { return blueNinja; }
set { blueNinja = value; }
}
public Rectangle SourceRect
{
get { return sourceRect; }
set { sourceRect = value; }
}
public AI(Texture2D texture, int currentFrame, int spriteWidth, int spriteHeight)
{
this.blueNinja = texture;
this.currentFrame = currentFrame;
this.spriteWidth = spriteWidth;
this.spriteHeight = spriteHeight;
}
public void AIMovement(GameTime gameTime)
{
sourceRect = new Rectangle(30 * currentFrame, 0, 30, 37);
if (position_b.X > redNinja.Position.X)
{
AnimateLeftAI(gameTime);
if (position_b.X < 20)
{
position_b.X += spriteSpeed;
}
}
if (position_b.X < redNinja.Position.X)
{
AnimateRightAI(gameTime);
if (position_b.X < 1100)
{
position_b.X += spriteSpeed;
}
}
}
public void AnimateLeftAI(GameTime gameTime)
{
timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds;
if (timer > interval)
{
currentFrame++;
if (currentFrame > 4)
{
currentFrame = 3;
}
timer = 0f;
}
}
public void AnimateRightAI(GameTime gameTime)
{
timer += (float)gameTime.ElapsedGameTime.TotalMilliseconds;
if (timer > interval)
{
currentFrame++;
if (currentFrame > 4)
{
currentFrame = 3;
}
timer = 0f;
}
}
}
}
您需要在调用AIMovement()时将玩家的忍者作为参数,如下所示:
public void AIMovement(GameTime gameTime, Ninjas playerNinja)
{
sourceRect = new Rectangle(30 * currentFrame, 0, 30, 37);
if (position_b.X > playerNinja.Position.X)
{
AnimateLeftAI(gameTime);
if (position_b.X < 20)
{
position_b.X += spriteSpeed;
}
}
if (position_b.X < playerNinja.Position.X)
{
AnimateRightAI(gameTime);
if (position_b.X < 1100)
{
position_b.X += spriteSpeed;
}
}
}
注意,您实际上不再需要声明一个名为redNinja
的字段变量,因为您将Ninjas作为测试的对象作为方法的参数/参数。
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