Question

所以我正在制作一个飞扬的小鸟副本。但是在绘制一个矩形之后我无法改变它的值，当我改变'pipe1.X'时它会被改变但从未在Form中实际改变过。当单击空格按钮时以及当timer1执行代码'rect.Y - = gravity;'时，我想要'rect'作为鸟来改变它的Y位置所以它不断下降。我想让管道向左移动，但由于某些原因，没有任何控件在移动。我尝试使用断点进行调试，并且rec.Y正在改变，就像我想要的那样，但它在形式上没有变化。

    int pipeSpeed = 1;
    int gravity = 1;
    static int y = 150;
    static int xP = 640;
    static int yP1 = 0;
    static int yP2 = 260;
    public Form1()
    {
        InitializeComponent();
    }
    Random r = new Random();

    public int a;
    public int b;
    private void Form1_Load(object sender, EventArgs e)
    {
        //640, -27, 16, 150
        timer1.Interval = 500;
        a = r.Next(25, 150);
        b = r.Next(150, 300);
        timer1.Start();

    }

    Rectangle rect = new Rectangle(25, y, 25, 25);
    Rectangle pipe1 = new Rectangle(xP, yP1, 25, 0);
    Rectangle pipe2 = new Rectangle(xP, yP2, 25, 0);
    private void update()
    {

    }
    private void timer1_Tick(object sender, EventArgs e)
    {
        Application.DoEvents();
        pipe1.X -= pipeSpeed;
        rect.Y -= gravity;


        if (xP == -35)
        {
            pipe1 = new Rectangle(xP, yP1, 25, 0);
            pipe2 = new Rectangle(xP, yP2, 25, 0);
        }

    }

    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e.KeyData == Keys.Space)
        {
            rect.Y -= 5;

        }

    }

    private void Form1_KeyPress(object sender, KeyPressEventArgs e)
    {

    }

    private void Form1_Paint(object sender, PaintEventArgs e)
    {

        e.Graphics.FillRectangle((Brushes.Red),rect);
        pipe1.Height = a;
        pipe2.Height = b;
        e.Graphics.FillRectangle((Brushes.Black),pipe1);
        e.Graphics.FillRectangle((Brushes.Black), pipe2);

    }`

Answer 1

你可以尝试

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
    if (e.KeyData == Keys.Space)
    {
        rect.Y -= 5;
        this.Invalidate();
    }

}

和

private void timer1_Tick(object sender, EventArgs e)
{
     ...
     this.Invalidate();
}

Form.Invalidate Method

使控件的整个表面无效并导致控件重新绘制。

请注意，有更多的重载和其他技巧可以提高效率，但这至少应该让您重绘表单

绘制后如何更改矩形值？

1 个答案: