java - 游戏角色移动太快

Question

我目前正在创建一个 Java 2D 游戏，我在其中接收来自用户的命令，将角色向上、向下、向左或向右移动一定距离。我目前正在使用 for 循环遍历用户输入并将字符串传递给 Player 类，该类将检查用户输入字符串是否与移动角色的方向之一匹配。当所有这些都被执行时，玩家似乎已经传送到终点位置。有没有办法让角色移动一定数量的像素，直到它到达目标位置，让玩家看起来好像自然地移动到该位置。

这是 movePlayer 函数，用于循环遍历 JTextFields，其中包含用户移动播放器的命令。来自每个文本字段的 strings 被传递到另一个函数:inputListener。

public void movePlayer(){

    for (int i = 0; i < userTextInput.size(); i++) {
        inputListener(userTextInput.get(i).getText());
    }
} 

inputListener 检查用户输入的strings 是否匹配移动类型，并启动适当的方法来移动角色。

private void inputListener(String Input){

     if(Input.equals("up")){
         player.moveCharacterUp();

     }else if(Input.equals("down")){
         player.moveCharacterDown();

     }else if(Input.equals("left")){
         player.moveCharacterLeft();

     }else if(Input.equals("right")){
         player.moveCharacterRight();

     }

}

这是根据 inputListener 运行的方法设置字符的 x 和 y 位置的地方

public void moveCharacterUp(){
    y -= moveSpeed;
} 

public void moveCharacterDown(){
    y += moveSpeed;
}

public void moveCharacterLeft(){
    x -= moveSpeed;
}

public void moveCharacterRight(){
    x += moveSpeed;
}

我正在使用的 Thread 的运行方法。

public void run(){

    init();

    long start;
    long elapsed;
    long wait;

    while(running){

        start = System.nanoTime();

        update();
        draw();
        drawToScreen();

        elapsed = System.nanoTime() - start;
        wait = targetTime - elapsed / 1000000;

        if(wait < 0) wait = 5;

        try{
            Thread.sleep(wait);

        }catch(Exception e){
            e.printStackTrace();
        }

     }
    }

Answer 1

我过去这样做的方法是创建一个 targetX 和 targetY。
然后我递增 x 和 y 直到它们等于 targetX 和 targetY。

int x = 0; //Character's x position
int y = 0; //Character's y position
int targetX = 0; //Character's target x position
int targetY = 0; //Character's target y position
int moveSpeed = 2; //the speed at which the character moves
int moveAmt = 20; //amount the character is set to move every time it is told to move

void setTarget(int targetX, int targetY) //sets targetX and targetY, doesn't need to be called at all
{
    this.targetX = targetX;
    this.targetY = targetY;
}

void moveCharacter(int x, int y) //moves the character, doesn't need to be called at all
{
    this.x = x;
    this.y = y;
}

void updatePosition() //initiates/continues movement, should be called every frame
{
    if(Input.equals("up")) {
         setTarget(targetX, targetY - moveAmt);

    } else if(Input.equals("down")) {
         setTarget(targetX, targetX + moveAmt);

    } else if(Input.equals("left")) {
         setTarget(targetX - moveAmt, targetX);

    } else if(Input.equals("right")) {
         setTarget(targetX + moveAmt, targetX);

    }

    if(y > targetY) {
         player.moveCharacter(x, y - moveSpeed);

    } else if(y < targetY) {
         player.moveCharacter(x, y + moveSpeed);

    } else if(x > targetX) {
         player.moveCharacter(x - moveSpeed, y);

    } else if(x < targetX) {
         player.moveCharacter(x + moveSpeed, y);

    }
}