在垂直轴上处理球拍和球类

Question

这是我现在的代码，但我想把球棒放在y轴上，让它垂直和向下移动，而不是水平移动，让球以从左到右的运动反弹，而不是上下运动。很快就需要帮助了。谢谢。

int x=250; // Horizontal position of ball
int direction_x=2; // Change in horizontal position each time draw() executed
int y=150; // Vertical position of ball
int direction_y=2; // Change in horizontal position each time draw() executed
int lives=3;
int score=0;

void setup()
{
    size(400,400); // Create a window 400x400 pixels
}
void draw()
{
    background(255,255,255); // Clear screen to white
    fill(0,255,0); // Set fill colour to blue
    rect(mouseY-60,380,120,20); // Position rectangle using mouse

    fill(0,0,255);
    ellipse(x,y,20,20); // Draw blue disk centered on x,y diameter 20
    x=x+direction_x; // Update position
    if(x<10) direction_x=-direction_x; // Reverse direction if hit boundary
    if(x>(width-10)) direction_x=-direction_x;

    y=y+direction_y;
    if(y<10) direction_y=-direction_y;
    // if(y>(height-10)) direction_y=-direction_y;

    if(y>(height-10)) // If ball bits bottom of screen then miss..
    {
        direction_y=-direction_y; // Bounce
        lives--; // Reduce lives by one
        if(lives==0) exit(); // If lives is zero then quit
    }

    if((y>(height-30))&&(abs(mouseX-x)<60)) // If ball has bit paddle then..
    {
        direction_y=-direction_y; // Bounce
        score++; // Increase score by one
    }

    textSize(32);
    fill(0,0,255);
    text(score, 10, 30); // Display score
    text(lives,width-30, 30); // Display lives
} 

Answer 1

因为很快就需要帮助，所以如果你问一个特定的“我尝试了X，预期是Y，但得到了Z”类型的问题，你会有更好的运气。除了提供一般的提示之外，很难帮助解决一般的“我如何做这件事”类型的问题。

话虽如此，我能想到的主要方法有两种：

选项一：将您的问题分解为更小的步骤。从一个空白的草图开始，让just the paddle按你想要的方式工作。然后试着添加球。在这之后工作，然后尝试添加游戏逻辑。这是更好的选择。

选项二：由于您似乎几乎可以上下操作，您可以使用 rotate()函数将所有内容旋转90度。不过，这有点小麻烦。

Answer 2

谢谢Kevin，终于让它工作了，原来我只需要将划板的坐标从(mouseX,0,0,0)更改为(0，mouseY,0,0)，并且需要添加额外的代码行来更改轴参数。我在玩老把戏，把事情搞得过于复杂。

    int x=250; // Horizontal position of ball
    int direction_x=2; // Change in horizontal position each time draw() executed
    int y=150; // Vertical position of ball
    int direction_y=2; // Change in horizontal position each time dra) executed
    int lives=3;
    int score=0;
    void setup()
    {
     size(400,400); // Create a window 400x400 pixels
    }
    void draw()
    {
    background(255,255,255); // Clear screen to white
    fill(0,255,0); // Set fill colour to blue
    rect(0,mouseY-60,20,120); // Position rectangle using mouse

    fill(0,0,255);
    ellipse(x,y,20,20); // Draw blue disk centered on x,y diameter 20
    x=x+direction_x; // Update position
    if(x<10) direction_x=-direction_x; // Reverse direction if hit boundary
    if(x>(width-10)) direction_x=-direction_x;

    y=y+direction_y;
    if(y<10) direction_y=-direction_y;
    // if(y>(height-10)) direction_y=-direction_y;

    if(y>(height-10)) // If ball bits bottom of screen then miss..
    {
    direction_y=-direction_y; // Bounce
    lives--; // Reduce lives by one
    if(lives==0) exit(); // If lives is zero then quit
    }

    if(x<10)
    {
    direction_x=-direction_x; // Bounce
    x=30; // Force x to beyond the paddle on a restart
    lives--; // Reduce lives by one
    if(lives==0) exit(); // If lives is zero then quit
    }

    if((x<30)&&(abs(mouseY-y)<60)) // If ball has bit paddle then..
    {
    direction_x=-direction_x; // Bounce
    score++; // Increase score by one
    }

    textSize(32);
    fill(0,0,255);
    text(score, 10, 30); // Display score
    text(lives,width-30, 30); // Display lives
   }