Question

所以我一直在自学c＃并遵循教程。直到这个时候没有重大问题。 Bun现在我无法自己找到解决方案。

所以我得到了一个简单形式的列表，它应该在不同的鼠标点击上创建矩形和吸引点。但是当我运行代码时，没有任何反应。

我无法理解有什么问题..请帮忙（=

public partial class Form1 : Form
{

    float mRectSize = 50;
    List<RectangleF> mRectangles = new List<RectangleF>();
    Random rnd = new Random();
    PointF mForcePoint = new PointF(-1, -1);
    bool mForcePush = false;
    int mRandomSeed = 10;

    public Form1()
    {
        InitializeComponent();
        Timer timer1 = new Timer();
        timer1.Interval = 1;
        timer1.Tick += Timer1_Tick;
        timer1.Start();


    }

    private void AddRectangle(PointF pos)
    {

        mRectangles.Add(new RectangleF(pos.X - mRectSize / 2, pos.Y - mRectSize / 2, mRectSize, mRectSize));
    }

    private void AddForcePoint(PointF pos)
    {
        mForcePoint = pos;
    }

    private void DrawRectangle(Graphics g, RectangleF rect)
    {
        Color c = Color.FromArgb(255, rnd.Next(255), rnd.Next(255), rnd.Next(255));
        g.FillRectangle(new SolidBrush(c), rect);
    }

    private PointF RandomiseDirection(PointF dir)
    {
        dir.X += rnd.Next(2 * mRandomSeed) - mRandomSeed;
        dir.Y += rnd.Next(2 * mRandomSeed) - mRandomSeed;

        return dir;
    }

    private void Form1_Paint(object sender, PaintEventArgs e)
    {
        Graphics g = e.Graphics;

        foreach (RectangleF rect in mRectangles)
        {
            DrawRectangle(g, rect);
        }
    }

    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == System.Windows.Forms.MouseButtons.Left)
        {
            AddRectangle(e.Location);
            //MessageBox.Show("test");
            Invalidate();
        }

        if (e.Button == System.Windows.Forms.MouseButtons.Right)
        {
            AddForcePoint(e.Location);
        }

        if (e.Button == System.Windows.Forms.MouseButtons.Middle)
        {
            mForcePush = !mForcePush;
        }

    }

    private void Timer1_Tick(object sender, EventArgs e)
    {
        if (mForcePoint.X != -1 && mForcePoint.Y != -1)
        {
            for (int i = 0; i < mRectangles.Count; i++)
            {
                RectangleF rect = mRectangles[i];

                PointF direction = new PointF(mForcePoint.X - rect.Location.X, mForcePoint.Y - rect.Location.Y);

                direction = RandomiseDirection(direction);

                if (mForcePush)
                {
                    rect.Location = new PointF(rect.Location.X - direction.X * 0.1f, rect.Location.Y - direction.Y * 0.1f);
                }

                else
                {
                    rect.Location = new PointF(rect.Location.X + direction.X * 0.1f, rect.Location.Y + direction.Y * 0.1f);
                }

                mRectangles[i] = rect;

            }

            Invalidate();

        }
    }
}

}

Answer 1

所以答案很简单。而且我责备了一个教程，因为没有提到这个曾经如此。

我只需要添加 MouseClick + =（我的MouseClick方法的名称）至私人Form1（）

尝试在点击时绘制矩形

1 个答案: