Question

该程序有球，蝙蝠和矩形。我设法让球正确地与球棒碰撞，这没关系。问题在于矩形。

对于我迄今为止所尝试的矩形，它确实检测到来自顶侧和左侧的碰撞，但我正在努力获得与底部和右侧相同的效果。

关于我哪里出错的任何指示我都会非常感激。为清楚起见，我在下面提供了代码。此外，当球确实碰撞时，它向左上方反弹。

    Graphics paper;
    SolidBrush brush;
    private Random randomNum;
    Rectangle ball, bat, brick;
    int x, y, yChange, xChange, batX;

    public Form1()
    {
        InitializeComponent();

        paper = picBox.CreateGraphics();
        randomNum = new Random();           
        bat = new Rectangle();
        brick = new Rectangle();            
    }       

    private void MoveBall()
    {
        timer1.Interval = randomNum.Next(80, 200);
        timer1.Enabled = true;

        x = x + xChange;
        y = y + yChange;
        if (x >= picBox.Width)
            xChange = -xChange;

        if (y >= picBox.Height)
            yChange = -yChange;

        if (x <= 0)
            xChange = -xChange;

        if (y <= 0)
            yChange = -yChange;
    }

    private void DrawBall()
    {
        brush = new SolidBrush(Color.Red);
        ball = new Rectangle(x, y, 14, 14);
        paper.FillEllipse(brush, ball);
    }

    private void DrawBat()
    {
        int batXpos, batYpos;
        batXpos = batX - 25; batYpos = picBox.Height - 40;
        bat = new Rectangle(batXpos, batYpos, 100, 20);
        brush = new SolidBrush(Color.Green);
        paper.FillRectangle(brush, bat);
    }

    private void DrawBricks()
    {
        brick = new Rectangle(200, 100, 100, 50);
        brush = new SolidBrush(Color.Pink);
        paper.FillRectangle(brush, brick);
    }

    private void CheckCollision()
    {
        int ballTop, ballRight, ballDown, ballLeft;
        ballTop = ball.Y + 7; ballDown = ball.Y + 14 + (ball.X + 7);            //THESE WERE JUST SOME ATTEMPTS TO GET
        ballRight = ball.X + 14 + (ball.Y + 7); ballLeft = ball.Y + 7;          //LOCATION OF THE BALL AND BRICK X AND Y
                                                                                //COORDS BUT STILL HAD PROBLEMS
        int brickTL, brickTR, brickBL, brickBR;
        brickTL = brick.X; brickTR = brick.X + 100;
        brickBL = brick.Y + 50; brickBR = brick.X + 100 + (brick.Y + 50);


        if (ball.IntersectsWith(bat))                          //NO PROBLEMS HERE                 
        {
            yChange = -10;

        }

        if (ball.IntersectsWith(brick))                                     //WORKS FINE FOR DETECTION ON THE TOP SIDE
        {
            xChange = -5;
        }

        if (ball.IntersectsWith(brick))                                         //WORKS FINE FOR THE RIGHT SIDE
        {
            yChange = -5;
        }

        if ((ballTop >= brickBR) && (x < picBox.Width))
        {
            yChange = 5;
        }
    }                

    private void btnStart_Click(object sender, EventArgs e)
    {
        timer1.Interval = randomNum.Next(80, 200);
        timer1.Enabled = true;

        x = randomNum.Next(5, picBox.Width);
        y = randomNum.Next(5, picBox.Height);
        xChange = randomNum.Next(5, 15);
        yChange = randomNum.Next(5, 15);           

    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        paper.Clear(Color.Gray);         

        DrawBall();
        MoveBall();
        DrawBat();
        CheckCollision();
        DrawBricks();
    }

    private void picBox_MouseMove(object sender, MouseEventArgs e)
    {
        batX = e.X;
    }

Answer 1

我认为你的条件得分很好......但你实际上并没有影响球的运动。

当球移动up时，它将具有负增量，并且当移动left时也将具有负增量。

当检测到碰撞时，您需要反转三角形的符号......如：

xChange *= -1;和yChange *= -1;

碰撞检测不是矩形的所有边都会正确碰撞

1 个答案: