Question

我在表单上有一个面板，用于创建用于路由数据包的网络拓扑。我能够在面板上绘制拓扑。但是，现在我希望小方块在按钮点击时从一个点移动到目的地。如何在面板上执行此操作？单击按钮时没有任何反应。如果有人能帮助我，我将不胜感激。这是我的代码的一部分：

public Form1()
{            
     InitializeComponent();

     this.SetStyle(ControlStyles.UserPaint 
          | ControlStyles.AllPaintingInWmPaint
          | ControlStyles.DoubleBuffer, true);

    //Initialize the point to start in the top left corner
    this.SetStyle(ControlStyles.UserPaint
          | ControlStyles.AllPaintingInWmPaint
          | ControlStyles.DoubleBuffer, true);

    //Initialize the point to start in the top left corner
    mPoint = new Point(mRect.Location.X, mRect.Location.X);

    //Set up the function to call when the timer fires
    TimerCallback timercb = new TimerCallback(TimerCB);

    //Set up the timer to fire at the set animation rate
    mTimer = new System.Threading.Timer(timercb,
        null, ANIMATION_RATE, ANIMATION_RATE);    
}

private void panel2_Paint(object sender, PaintEventArgs e)
{
    if(sendbut) {
        Graphics dc = panel2.CreateGraphics();
        //Fill the background of the client area
        dc.FillRectangle(SystemBrushes.Control, this.ClientRectangle);

        //Draw the big rectangle track
        dc.DrawRectangle(Pens.Black, mRect);

        //Clone the point
        Point p = new Point(mPoint.X, mPoint.Y);

        //Offset it by half the width and height of the desired rectangle
        p.Offset(-(RECT_WIDTH / 2), -(RECT_HEIGHT / 2));

        //Draw the little moving rectangle
        dc.FillRectangle(Brushes.Black, 
            new Rectangle(p, new Size(RECT_WIDTH, RECT_HEIGHT)));
    }
}

protected void TimerCB(object o)
{
    //Move the rectangle
    MovePoint();

    //Redraw the form
    Invalidate();
}

private void button3_Click(object sender, EventArgs e)
{          
    sendbutt = true;
}

Answer 1

假设panel2_Paint是panel2.Paint事件的处理程序，那么在绘制发生后，该方法将被称为。您要做的是，创建一个从Panel继承并覆盖OnPaint方法的自定义控件。请参阅here。

在面板上设置正方形动画

1 个答案: